@article {ulmo_diaz_one_2023, title = {One species, one population: panmixia in American Eel (Anguilla rostrata) extends to its tropical range of distribution}, journal = {Molecular Ecology}, year = {Submitted}, abstract = {The American Eel (Anguilla rostrata) has long been regarded as a panmictic fish and has been confirmed as such in the northern part of its range. In this paper, we tested for the first time whether panmixia extends to the tropical range of the species. To do so, we first assembled a reference genome (975 Mbp, 19 chromosomes) in order to support both this study and future research. To test for population structure, we estimated genotype likelihoods from low coverage whole genome sequencing of 460 American Eels, collected at 21 sampling sites (in seven geographic regions) ranging from Canada to Trinidad and Tobago. We estimated genetic distance between regions, performed ADMIXTURE-like clustering analysis and multivariate analysis, and found no evidence of population structure. In addition, two genomic regions with putative inversions were observed, both geographically widespread and present at similar frequencies in all regions. We discuss the implications of lack of genetic population structure for the species. Our results are key for the future genomic research in the American Eel and the implementation of conservation measures throughout its geographic range.}, author = {Ulmo Diaz, Gabriela and Engman, Augustin and McLarney, Bill and Lasso Alcal{\'a}, Carlos and Hendrickson, Dean A. and Bezault, Etienne and Fenteun, Eric and Prats-L{\'e}on, Fernando and Wiener, Jean and Maxwell, Robby and Mohammed, Ryan and Kwak, Thomas and Bougas, B{\'e}r{\'e}nice and Babin, Charles and Normandeau, Eric and Djambazian, Haig and Chen, Shu-Huang and Reiling, Sarah and Ragoussis, Jiannis and Bernatchez, Louis} } @manuascript {stewart_development_2023, title = {Development and application of environmental DNA (eDNA) markers to assess factors affecting occupancy of the endangered Yaqui Catfish and non-native Channel Catfish in the Yaqui River basin, Mexico}, journal = {Endangered Species Research}, volume = {n/a}, number = {n/a}, year = {Submitted}, abstract = {Acquiring data on rare and threatened species can be challenging, particularly in remote areas. However, environmental DNA (eDNA) surveys offer a less effort-intensive method of detecting these species than more traditional fish sampling methods. In our study, we focused on the Yaqui Catfish (Ictalurus pricei), an endangered freshwater fish endemic to the Sonoran desert (Arizona, US and Sonora, Mexico), and the non-native Channel Catfish (Ictalurus punctatus). To detect these species, we developed and employed mitochondrial DNA markers and a stratified random sampling method. We collected water samples for eDNA detection from 35 locations in the Yaqui River basin in Mexico. Using a hierarchical Bayesian formulation of a co-occurrence model, we examined the effects of interacting species, where one species is dominant (Channel Catfish) and the other subordinate (Yaqui Catfish), while allowing for the effects of covariates to be specified on species occupancy and detection. Our best model included the influence of non-native Channel Catfish on detecting native Yaqui Catfish. Moreover, we found that detection of Channel Catfish was negatively related to water temperature and elevation, but positively related to substrate size. Occupancy of Yaqui Catfish was best explained by stream permanence (i.e., higher rates of stream discharge and low probabilities of the reach drying) and forested areas. Channel Catfish were also associated with stream permanence (i.e., low probabilities of the stream reach drying and larger upstream watershed areas) and conifer and shrub-dominated landscapes. Non-native Channel Catfish eDNA was found in all but five locations where Yaqui Catfish eDNA was detected, indicating a high likelihood of interaction and hybridization. The threat of hybridization to the already endangered Yaqui Catfish highlights the need to secure remaining populations for their long-term survival.}, keywords = {Chihuahua, Ictalurus pricei, Rio Yaqui, Sonora, Yaqui catfish}, author = {Stewart, David R. and Hafen, Thomas and Hendrickson, Dean A. and Taylor, Andrew T. and Varela-Romero, Alejandro and Mason, Daniel H. and Dysthe, Joseph C. and Franklin, Thomas W. and Young, Michael K. and McKelvey, Kevin S. and Schwartz, Michael K. and Long, James M.} } @article {turner_long-term_2022, title = {Long-Term Ecological Research in Freshwaters Enabled by Regional Biodiversity Collections, Stable Isotope Analysis, and Environmental Informatics}, journal = {Bioscience}, year = {Submitted}, type = {Overview Article}, abstract = {Biodiversity collections are experiencing a renaissance fueled by the intersection of informatics, emerging technologies, and the extended use and interpretation of specimens and archived databases. This paper explores the potential for transformative research in ecology integrating biodiversity collections, stable isotope analysis (SIA), and environmental informatics. Like genomic DNA, SIA provides a common {\textquoteleft}currency{\textquoteright} interpreted in the context of biogeochemical principles. Integration of SIA data across collections allows for evaluation of long-term ecological change at continent-wide scales. Challenges, including analysis of sparse samples, lack of isotopic baselines, and effects of preservation remain but none are insurmountable. The general research framework proposed here interfaces with databases and observatories, such as the National Ecological Observatory Network (NEON), to provide baselines for retrospective studies and ecological forecasting. Collections and SIA add historical context to fundamental questions in freshwater ecological research, baselines for ecosystem monitoring, and a means of quantitative assessment for ecosystem restoration.}, author = {Turner, Thomas and Bart Jr., Henry L. and McCormick, Frank and Besser, Alexi and Bowes, Rachel and Capps, Krista D. and DeArmon, Emily and Dillman, Casey B. and Driscoll, Katelyn and Dugger, Aubrey and Hamilton, Greggor and Harris, Phillip and Hendrickson, Dean A. and Hoffman, Joel and Knouft, Jason and Lepak, Ryan and Lopez-Fernandez, Hernan and Montana, Carmen G and Newsome, Seth and Pease, Allison and Smith, W. and Taylor, Christopher and Wlicky, Rachel} } @inbook {pease_rivers_2023, title = {Rivers of Mexico}, booktitle = {Rivers of North America}, year = {2023}, pages = {975{\textendash}1015}, publisher = {Academic Press}, organization = {Academic Press}, edition = {2}, address = {Boston, Massachusetts}, abstract = {The rivers found in the eight countries in southern North America are exceptionally ecologically and culturally diverse. In this chapter, we focus on a small number of the rivers found in the largest of these countries, Mexico. Remarkable variation in climate and topography generates differences in orographic factors that produce diverse precipitation regimes throughout the country, subsequently influencing patterns in runoff and temporal and spatial variation in Mexican rivers (Hudson et al., 2005; INEGI, 2020a). Mexico is 1.96 million km2, or approximately only20\% the size of the United States, yet it is home to 84\% of the total number of Level II ecoregions found in the United States and is characterized by exceptional heterogeneity in surface water resources. Some of the wettest (e.g., the Lacand{\textasciiacute}on Forest in Chiapas) and driest (e.g., the deserts of Sonora) places on the continent are found in Mexico. The Mexican population is growing and so is the Mexican economy (World Bank, 2020). As seen in many regions of the world, the population is urbanizing with growth concentrated in larger cities; approximately 80\% of the Mexican population is urban. Population density is approximately 65 people/km2, and annual population growth is currently estimated to be 1.1\%. Like many other North American basins, agricultural development, industri-alization, and hydroelectric development threaten the quality and quantity of water flowing through Mexican rivers. Mexico is currently home to at least 25 major Indigenous groups (INEGI, 2020a), many of whom also have long and complex relationships with rivers and streams. It is widely accepted that land-use change and infrastructure development by early civilizations had large impacts on basin-level processes. The Olmec, the earliest known major civilization in Mesoamerica, constructed the first conduit drainage system in the Americas (Doolittle, 2011). As it still does today, forest conversion to slash and burn agriculture by early Mexican civilizations accel-erated soil erosion, potentially compromising freshwater quality. The Mayans reached a population of approxi-mately five million people, peaking around 700 CE They depended on travel and trade conducted along the Grijalva-Usumacinta River, one of the largest drainages in Mesoamerica (Beach et al., 2015).}, isbn = {978-0-12-818847-7}, author = {Pease, Allison A. and Capps, Krista D. and M. Castillo, Mar{\'\i}a and Hendrickson, Dean A. and Mendoza-Carranza, Manuel and Rodiles-Hern{\'a}ndez, Roc{\'\i}o and Avila, Colton and Contreras-MacBeath, Topiltzin}, editor = {DeLong, M.D. and Jardine, T.D. and Benke, Arthur C. and Cushing, C. E.} } @article {janzen_phylogenetic_2023, title = {Phylogenetic relationships of the North American catfishes (Ictaluridae, Siluriformes): investigating the origins and parallel evolution of the troglodytic species}, journal = {Molecular Phylogenetics and Evolution}, year = {2023}, pages = {107746}, abstract = {Insular habitats have played an important role in developing evolutionary theory, including natural selection and island biogeography. Caves are insular habitats that place extreme selective pressures on organisms due to the absence of light and food scarcity. Therefore, cave organisms present an excellent opportunity for studying colonization and speciation in response to the unique abiotic conditions that require extreme adaptations. One vertebrate family, the North American catfishes (Ictaluridae), includes four troglodytic species that inhabit the karst region bordering the western Gulf of Mexico. The phylogenetic relationships of these species have been contentious, and conflicting hypotheses have been proposed to explain their origins. The purpose of our study was to construct a time-calibrated phylogeny of Ictaluridae using first-occurrence fossil data and the largest molecular dataset on the group to date. We test the hypothesis that troglodytic ictalurids have evolved in parallel, thus resulting from repeated cave colonization events. We found that Prietella lundbergi is sister to surface-dwelling Ictalurus and that Prietella phreatophila + Trogloglanis pattersoni are sister to surface-dwelling Ameiurus, suggesting that ictalurids colonized subterranean habitats at least twice in evolutionary history. The sister relationship between Prietella phreatophila and Trogloglanis pattersoni may indicate that these two species diverged from a common ancestor following a subterranean dispersal event between Texas and Coahuila aquifers. We recovered Prietella as a polyphyletic genus and recommend P. lundbergi be removed from this genus. With respect to Ameiurus, we found evidence for a potentially undescribed species sister to A. platycephalus, which warrants further investigation of Atlantic and Gulf slope Ameiurus species. In Ictalurus, we identified shallow divergence between I. dugesii and I. ochoterenai, I. australis and I. mexicanus, and I. furcatus and I. meridionalis, indicating a need to reexamine the validity of each species. Lastly, we propose minor revisions to the intrageneric classification of Noturus including the restriction of subgenus Schilbeodes to N. gyrinus (type species), N. lachneri, N. leptacanthus, and N. nocturnus.}, keywords = {Aquifer, BIOGEOGRAPHY, Hypogean, Insular habitats, speciation, Time-calibrated phylogeny}, issn = {1055-7903}, doi = {10.1016/j.ympev.2023.107746}, url = {https://www.sciencedirect.com/science/article/pii/S1055790323000465}, author = {Janzen, Francesco H. and P{\'e}rez-Rodr{\'\i}guez, Rodolfo and Dom{\'\i}nguez-Dom{\'\i}nguez, Omar and Hendrickson, Dean A. and Sabaj, Mark H. and Blouin-Demers, Gabriel} } @conference {hendrickson_fishes_2023, title = {Fishes of Texas Project: update and future}, year = {2023}, note = {Accepted: 2023-02-24T22:10:44Z}, address = {Corpus Christi, Texas, USA}, abstract = {Fish occurrence data are widely scattered and mostly not published as data readily utilizable by computers. Global biodiversity aggregating services (e.g. GBIF, iDigBio, Fishnet) now aggregate and serve whatever data are submitted to them in the standard Darwin Core format, but their data are often replete with errors, minimally normalized, lacking content across standard fields, and served via generic mapping services lacking linkages to local and aquatic ecology-relevant resources (i.e., for fishes, they are ignorant of hydrography). In contrast, Fishes of Texas (FoTX) includes the same data and much more, including unpublished data from more diverse sources. FoTX{\textquoteright}s rigorous quality-control measures, including specimen-based ID verifications, checking of legacy georeferencing, and flagging suspicious records has combined to greatly reduce errors. The custom FoTX website provides interactive exploration and data summarization, within the context of geopolitical and, now geographically-expanded hydrographic coverages, thus facilitating visualization and discovery of conservation-relevant histories and trends over time. The site allows viewing of derivative products, such as niche models, estimates of native ranges, checklists, data dashboards, and Native Fish Conservation Areas. The site also serves extensive image collections, collectors{\textquoteright} field notes, and links to digitized, formerly inaccessible unpublished agency reports. Finally, core FoTX data fields are also published to GBIF as Darwin Core to make it available to the world.}, doi = {10.26153/tsw/44416}, url = {https://repositories.lib.utexas.edu/handle/2152/117536}, author = {Hendrickson, Dean and Cohen, Adam and Garrett, Gary} } @booklet {hendrickson_testing_2022, title = {Testing An Alternative Shelving Arrangement to Optimize Space and Task Efficiency in a Fluid Fish Collection}, year = {2022}, type = {video recording}, address = {Edinburgh, Scotland, UK}, abstract = {For centuries, a taxonomic and alphabetic arrangement (TAA) of objects on shelves prevailed in fluid-preserved natural history collections while they were managed mostly by scientists for their own or vistors{\textquoteright} on-site research using physical specimens. However, most modern collections are now databased and internet-accessible, facilitating diverse forms of research accomplished remotely and decreasing the frequency of need for physical access to specimens, yet the way specimens are shelved and accessed remains nearly universally unchanged. With our fish collection struggling with both severe space limitation and unprecedented rapid growth supporting externally funded research that requires rapid specimen processing and data publication, we started shelving in an object (jar) and catalog number-based arrangement (OCA). To make that possible in our limited and near-full space, without altering our physical shelves in any way, we eliminated all between-jar spaces in our collection, including the customary space between taxa, while keeping it in its original TAA-based order (thus eliminating TAA-based growth capacity. In the resultant empty shelf space, we implemented an OCA shelving system for all newly cataloged jars. Once the OCA contained a relatively large number of jars, we carried out pragmatic, TAA-OCA comparisons. Volumetric jar storage capacity in the OCA is 17\% \textgreater TAA, and adjusting the OCA{\textquoteright}s vertical shelf spacing to optimizefor each of our 3 jar sizes (impossible in the TAA), could increase that to 115\% \textgreater TAA. Ten of 15 routine staff tasks were more efficiently accomplished in the OCA than in the TAA, and the OCA greatly decreases shelving errors (misplacement). We discuss ways to improve efficiency in the OCA for the 5 tasks on which the TAA out-performed it, and report ancillary, unanticipated benefits, such as a way to much more efficiently and quickly monitor fluid levels across all jars. All newly cataloged specimen jarscontinue going into our OCA, and we have significantly postponed hitting the point of absolutely being unable to continue growing. We are hopeful that eventually, a move to a new space will enable conversion of the entire collection from TAA to a more fully-optimized OCA.}, url = {https://utexas.box.com/s/72pz3aflql6juixbs7wbpm6sp1rko6o5}, author = {Hendrickson, Dean A.} } @conference {hendrickson_update_2022, title = {Update on taxonomic \& conservation status of North American blindcats (Ictaluridae)}, year = {2022}, note = {Accepted: 2022-12-08T20:01:18Z}, abstract = {We provide an updated overview of the taxonomic and conservation status of all North American blind Ictalurids, and continuing efforts to better understand them. In Texas{\textquoteright} deep Edwards Aquifer under San Antonio, Satan eurystomus (Widemouth Blindcat) has not been collected since 1984, but fragments of Trogloglanis pattersoni (Toothless Blindcat) continue to appear occasionally from the only well still consistently available for sampling, providing material for its recently published complete mitogenome. A metabarcoding-based eDNA sampling project hoping to detect blindcats (and other taxa) is now in early testing in wells throughout the San Antonio area. Lack of access to wells remains a major roadblock for that effort, but we have promising outreach efforts developing that we hope will open doors for sampling in the near future. In the adjacent transboundary Edwards-Trinity Aquifer, new localities have been found for Prietella phreatophila (Mexican Blindcat) in both Coahuila and Texas, and a captive colony at San Antonio Zoo continues to thrive and grow. Two complete mitochondrial genomes from 2 specimens of this species using different methodologies are now available. We present new CT data that indicate specimens from a cave \textasciitilde25 km N of the type locality of Prietella lundbergi (Phantom Blindcat) in Tamaulipas, M{\'e}xico, initially reported as that species, represent an undescribed taxon. Multiple attempts by divers to obtain additional specimens of P. lundbergi from the type locality have failed, leaving the formalin-preserved holotype as the only specimen of that species.}, doi = {10.26153/tsw/43843}, url = {https://repositories.lib.utexas.edu/handle/2152/116948}, author = {Hendrickson, Dean A. and Lundberg, John and Luckenbill, Kyle and Arce-H., Mariangeles} } @inbook {pease_rivers_2022, title = {Rivers of Mexico}, booktitle = {Rivers of North America}, year = {2022}, publisher = {Academis Press}, organization = {Academis Press}, edition = {2}, address = {Boston, Massachusetts}, abstract = {Mexico is a country of exceptional physiographic diversity, and the heterogeneity of surface- water resources in the country is remarkable. Some of the wettest (e.g., the Lacand{\'o}n Forest in Chiapas) and driest (e.g., the deserts of Sonora) places on the North American continent are in Mexico. Mexico is also home to a great diversity of indigenous cultures, many of which have long and complex relationships with rivers and streams. In this chapter, we describe eight rivers: R{\'\i}o Fuerte, R{\'\i}o Salado, R{\'\i}o Nazas-Aguanaval, R{\'\i}o Tames{\'\i}, R{\'\i}o Balsas, R{\'\i}o De la Sierra, R{\'\i}o Lacant{\'u}n, and R{\'\i}o Hondo. The basins we selected are distributed throughout the country and have diverse drainage patterns; some are endorheic, and others drain into the Pacific Ocean, the Gulf of Mexico, or the Caribbean Sea.}, isbn = {978-0-12-818847-7}, author = {Pease, Allison A. and Capps, Krista D. and Hendrickson, Dean A. and Mendoza-Carranza, Manuel and Rodiles-Hern{\'a}ndez, Roc{\'\i}o and Avila, Colton and Contreras-MacBeath, Topiltzin}, editor = {DeLong, M.D. and Jardine, T.D. and Benke, Arthur C. and Cushing, C. E.} } @inbook {pease_pease_2022, title = {Pease, A.A., K.A. Capps, M.M. Castillo, D.A. Hendrickson, M.M. Mendoza-Carranza, R.R. Rodiles-Hern{\'a}ndez, C. Avila, and T. Contreras-MacBeath. In press. Rivers of Mexico. In M.D. Delong, T.D. Jardine, A.C. Benke, and C.E. Cushing, editors. Rivers of North}, booktitle = {Rivers of North America}, year = {2022}, publisher = {Academis Press}, organization = {Academis Press}, edition = {2}, address = {Boston, Massachusetts}, abstract = {Mexico is a country of exceptional physiographic diversity, and the heterogeneity of surface- water resources in the country is remarkable. Some of the wettest (e.g., the Lacand{\'o}n Forest in Chiapas) and driest (e.g., the deserts of Sonora) places on the North American continent are in Mexico. Mexico is also home to a great diversity of indigenous cultures, many of which have long and complex relationships with rivers and streams. In this chapter, we describe eight rivers: R{\'\i}o Fuerte, R{\'\i}o Salado, R{\'\i}o Nazas-Aguanaval, R{\'\i}o Tames{\'\i}, R{\'\i}o Balsas, R{\'\i}o De la Sierra, R{\'\i}o Lacant{\'u}n, and R{\'\i}o Hondo. The basins we selected are distributed throughout the country and have diverse drainage patterns; some are endorheic, and others drain into the Pacific Ocean, the Gulf of Mexico, or the Caribbean Sea.}, isbn = {978-0-12-818847-7}, author = {Pease, Allison A. and Capps, Krista D. and Hendrickson, Dean A. and Mendoza-Carranza, Manuel and Rodiles-Hern{\'a}ndez, Roc{\'\i}o and Avila, Colton and Contreras-MacBeath, Topiltzin}, editor = {DeLong, M.D. and Jardine, T.D. and Benke, Arthur C. and Cushing, C. E.} } @booklet {middleton_spatial_2022, title = {Spatial Database of Known and Potential Ci{\'e}negas in the Greater Madrean Archipelago Ecoregion: U.S.}, year = {2022}, note = {Type: dataset}, publisher = {U.S. Geological Survey}, abstract = {This dataset provides location information and some limited attributes of known and potential ci{\'e}negas in the Madrean Archipelago ecoregion and closely surrounding area. This was created using point data and information provided by Dean Hendrickson and Thomas Minckley, combined with potential locations derived from analysis of classified raster land cover images and other specialized datasets. Ci{\'e}negas, as defined here, are wetlands in arid and semi-arid regions associated with groundwater or lotic components that ideally result in perennial waters on temporal scales of decades to centuries. Ci{\'e}negas are typically located at elevations ranging from 0 to 2000m. Ci{\'e}negas are typified by significant differences in flora and fauna relative to the greater terrestrial conditions in the region in which they are located. Ci{\'e}negas are freshwater to brackish North American wetlands associated with fluvial systems of arid/semi-arid areas of the southwestern U.S. and northwestern Mexico. Once extensively utilized by the region{\textquoteright}s indigenous human cultures, as well as early European explorers and settlers, the extent of these aquatic riparian communities has dramatically decreased from historic conditions. These communities are now considered imperiled in North America. The data were collected to provide an up-to-date inventory of ci{\'e}negas, along with the locations of potential ci{\'e}negas, in the Madrean Archipelago ecoregion (and surrounding 15km buffer) in the US and Mexico. This database is meant to bring attention to ci{\'e}negas and ultimately prompt more research and restoration activities on these rare and vulnerable ecosystems. The point data are not meant to provide the precise location, but rather depict a general location. The locations of potential ci{\'e}negas were calculated as the centroid of the associated, classified raster image pixels or vector polygons. These points would, therefore, not be ideal as target information for a supervised classification of remotely sensed data. This dataset, however, is useful for locating ci{\'e}negas for further research, analysis, management and restoration. Additionally, this census of known and potential ci{\'e}negas provides a regional geospatial overview of this important ecosystem that few resources can match. In the near future, moreover, we are intending to perform a landscape change analysis focused on ci{\'e}negas of the greater Madrean Archipelago ecoregion.}, keywords = {Ecology, Geography, Hydrology, Water Resources}, doi = {10.5066/P91FM1K1}, url = {https://doi.org/10.5066/P9WGNZFG}, author = {Middleton, Barry R and Norman, Laura M and Hendrickson, Dean A. and Minckley, Thomas A} } @booklet {hendrickson_database_2021, title = {Database of Cienega Locations in Southwestern United States and Northern Mexico}, year = {2021}, note = {Type: dataset}, publisher = {U.S. Geological Survey}, abstract = {Cienegas, as defined here, are wetlands in arid and semi-arid regions associated with groundwater or lotic components that ideally result in perennial waters on temporal scales of decades to centuries. Cienegas are typically no lower than 0 m, and higher than 2000 m, rarely lower but sometimes higher elevation localities occur. Cienegas are typified by significant differences in flora and fauna relative to the greater terrestrial conditions in the region in which it is located. Cienegas are freshwater to brackish North American wetlands associated with fluvial systems of arid/semi-arid areas of the southwestern U.S. and northwestern Mexico. Once extensively utilized by the region{\textquoteright}s indigenous human cultures, early European explorers and settlers, the extent of these aquatic riparian communities has dramatically decreased from historic conditions and the community is now considered imperiled in North America. This dataset provides location information and some limited attributes of cienegas in the southwestern U.S. and northern Mexico. There is no information as to the size of the cienega and other important attributes.}, keywords = {Ecology, Geography, Hydrology, Water Resources}, doi = {10.5066/P91FM1K1}, url = {https://www.sciencebase.gov/catalog/item/61a80c96d34eb622f6985e49}, author = {Hendrickson, Dean A. and Minckley, Thomas A and Middleton, Barry R and Norman, Laura M} } @conference {hendrickson_fishes_2021-1, title = {The Fishes of Texas Project: Government-University Collaboration to Improve Science and Conservation Management}, year = {2021}, note = {Accepted: 2021-09-09T16:37:50Z Publisher: YouTube - https://www.youtube.com/watch?v=l9UIVTxZMnw}, month = {jun}, abstract = {Video of presentation in invited webinar (CCAST - also at https://www.youtube.com/watch?v=l9UIVTxZMnw) - Since 2006, the Fishes of Texas Project at University of Texas Austin has sought to improve freshwater fish occurrence data for the state of Texas and make it openly accessible to facilitate research and improve aquatic resource management. Seven federal and state sponsors have contributed funding, but 73\% of the total \$2.7 million has come from US Fish and Wildlife Service{\textquoteright}s State Wildlife Grant Program via Texas Parks and Wildlife Department. Initially the Project focused on data digitization and compilation of strictly specimen-vouchered data, followed by georeferencing and development of an interactive website/database (http://www.fishesoftexas.org). More recently, non-vouchered citizen science, angler-based, and agency datasets have been added, thereby increasing both geographic and temporal density of records, and a selected subset of data fields for all records is now published to GBIF and iDigBio.}, doi = {10.26153/tsw/14488}, url = {https://repositories.lib.utexas.edu/handle/2152/87544}, author = {Hendrickson, Dean and Cohen, Adam and Casarez, Melissa and Garrett, Gary and Birdsong, Timothy and Robertson, Sarah and Curtis, Stephen and Mayes, Kevin and Bean, Megan} } @conference {hendrickson_fishes_2021, title = {Fishes of Texas Project: Government-University Collaboration to Improve Science and Conservation Management}, volume = {2021}, year = {2021}, note = {Accepted: 2021-09-09T18:01:28Z Publisher: The Society for the Preservation of Natural History Collections and the American Institute for Conservation}, publisher = {Society for the Preservation of Natural History Collections (SPNHC) and the American Institute for Conservation}, organization = {Society for the Preservation of Natural History Collections (SPNHC) and the American Institute for Conservation}, address = {virtual (online)}, abstract = {Video of presentation at meeting - Since 2006 the Fishes of Texas (FoTX) Project at University of Texas Austin (UT) has sought to improve freshwater fish occurrence data for the state of Texas and make it openly accessible to facilitate research and improve aquatic resource management. Seven federal and state sponsors have contributed funding, but 73\% of the total \$2.7 million has come from US Fish and Wildlife Service{\textquoteright}s State Wildlife Grant Program via Texas Parks and Wildlife Department (TPWD). Initially the Project focused on data digitization and compilation of strictly specimen-vouchered data, followed by georeferencing and development of an interactive website/database (http://www.fishesoftexas.org). More recently, non-vouchered citizen science, angler-based, and agency datasets have been added, thereby increasing both geographic and temporal density of records, and a selected subset of data fields for all records is now published to GBIF and iDigBio. The project{\textquoteright}s comprehensive data aggregation (44 contributing collections), digitization, normalization, accessibility and high data quality (based, in part on extensive taxonomic determination verification via specimen examination), enabled significant advances in detection and awareness of statewide faunal trends that led to implementation of diverse management advances. Examples include improved field guides and documentation of species{\textquoteright} ranges, expansions and contractions, community composition shifts, improved species conservation status assessments, and documentation of both long-term expansions of invasive species and new introductions. Relatively new to the Project are statewide aquatic bioassessments - intensive fieldwork planned using tools available in our website that facilitate exploration of geographic and temporal sampling histories and reveal under-sampled areas. Consequently, gaps in knowledge of regional faunas have been steadily decreasing. The website and database are widely used; 90\% of presentations on related topics at last year{\textquoteright}s statewide fisheries meeting utilized FoTX products. This now long-term, consistent funding created a productive partnership between UT and TPWD. With the Project{\textquoteright}s bioassessments generating specimens, and TPWD{\textquoteright}s independent routine fish sampling increasingly depositing specimens, our collection (TNHCi - https://www.gbif.org/dataset/6080b6cc-1c24-41ff-ad7f-0ebe7b56f311) has nearly doubled in size over the last decade. Last year, TPWD{\textquoteright}s list of Species of Greatest Conservation Need was updated, with major changes based on the improved knowledge provided by FoTX. TPWD now funds a full-time Assistant Collection Manager position focusing on bioassessments, but also doing basic collection management and supervision of student and volunteer help. Another grant-funded position, a liaison between the collection and TPWD staff, spawned the ongoing statewide Texas Native Fish Conservation Areas program that coordinates funding and actions of diverse stakeholders for watershed-scale conservation. Both externally funded UT positions participate in diverse collections-based research and outreach endeavors for both UT and TPWD. The FoTX website was developed in large part by staff in UT{\textquoteright}s science database group in the Texas Advanced Computing Center (TACC) - a collaboration that blossomed into long-term technical support for collection database management and data publication that has since expanded to support all other collections in UT{\textquoteright}s Biodiversity Center.}, doi = {10.26153/tsw/14491}, url = {https://repositories.lib.utexas.edu/handle/2152/87547}, author = {Hendrickson, Dean and Cohen, Adam and Casarez, Melissa and Garrett, Gary and Birdsong, Timothy and Robertson, Sarah and Curtis, Stephen and Mayes, Kevin and Bean, Megan} } @inbook {propst_clark_2021, title = {Clark Hubbs (March 15, 1921 - February 3, 2008)}, booktitle = {Standing between Life and Extinction}, year = {2021}, note = {http://web.archive.org/web/20200806221337/https://www.bibliovault.org/BV.landing.epl?ISBN=9780226694504}, publisher = {University of Chicago Press}, organization = {University of Chicago Press}, abstract = {Each field has its pioneers, and the field of desert fish conservation is no exception. Efforts to conserve aquatic life in the desert have been fueled equally by the ecological understandings developed by science and conservation actions directed by firmly held ethical beliefs. A few individuals are capable of combining scientific knowledge and conservation ethics into an undeniable passion that becomes contagious. These pioneering giants marveled at the ability of certain species to survive in seemingly harsh environments and, when necessary, mounted a vigorous defense when outside forces threatened their survival. This chapter traces the careers of a small handful of highly dedicated and influential scientists who recognized the value of desert fishes and came to their aid at a time when few cared for, or even knew of, such species. They saved species and habitats while influencing so many to follow in their footsteps. In this chapter, the legacies of eight giants in the field desert fish conservation are honored, and it is hoped that through these biographies they will continue to inspire new professional, ethical, committed warriors to join the battle against extinction.}, keywords = {archived}, isbn = {978-0-226-69433-7}, doi = {10.7208/chicago/9780226694504.003.0002}, url = {https://www.bibliovault.org/BV.landing.epl?ISBN=9780226694504}, author = {Garrett, Gary P.}, editor = {Propst, David and Williams, Jack and Bestgen, Kevin and Hoagstrom, Christopher} } @article {hafen_environmental_2021, title = {Environmental conditions associated with occurrences of the threatened Yaqui Catfish in the Yaqui River basin, Mexico}, journal = {North American Journal of Fisheries Management}, volume = {n/a}, number = {n/a}, year = {2021}, note = {\_eprint: https://afspubs.onlinelibrary.wiley.com/doi/pdf/10.1002/nafm.10653}, abstract = {Yaqui Catfish Ictalurus pricei is an understudied species with limited information of its ecology, distribution, and local habitat use. Native to the southwest United States and northwest Mexico, Yaqui Catfish populations are declining which has prompted the species to be listed as threatened in the United States and a species of concern in Mexico. Water over-allocation, habitat degradation, invasive species introductions, and hybridization with non-native Channel Catfish I. punctatus have caused the populations in Mexico to decline. The United States population collapsed after years of low recruitment. To better focus conservation efforts, as well as define habitat associated with Yaqui Catfish occurrences, we assessed the distribution in the Yaqui River Basin of Mexico using historical data at a landscape scale. Yaqui Catfish were historically found across the watershed among a diversity of environments, but most frequently associated with small, intermittent streams. Basin landcover was dominated by forest, shrubland, and grassland and Yaqui Catfish generally occurred in stream segments in similar proportions. However, a small number of Yaqui Catfish occurrences were associated with urban and cropland landcover types greater than that which was present on the landscape. With the species facing declines in the region, this work will help inform future conservation efforts aimed at securing this species, protecting suitable habitat and better defining its current status in Mexico.}, issn = {1548-8675}, doi = {https://doi.org/10.1002/nafm.10653}, url = {10/gj7ff2}, author = {Hafen, Thomas and Taylor, Andrew T. and Hendrickson, Dean A. and Stewart, David R. and Long, James M.} } @article {oldfield_live_2021, title = {Live Color Patterns Diagnose Species: A Tale of Two Herichthys}, journal = {Miscellaneous Publications of the Museum of Zoology, University of Michigan}, volume = {209}, year = {2021}, note = {Publisher: My University}, month = {may}, pages = {1{\textendash}19}, abstract = {The Rio Grande Cichlid, Herichthys cyanoguttatus, is native to the drainages of the Gulf Coast of northern Mexico and southern Texas and has been introduced at several sites in the US. Previous observations have suggested that non-native populations in Louisiana that are currently recognized as H. cyanoguttatus resemble another species, the Lowland Cichlid, H. carpintis. Traditional morphological and genetic techniques have been insufficient to differentiate these species, but H. carpintis has been reported to differ from H. cyanoguttatus in color pattern, so we turned to novel electronic photo archives to determine the identity of the species introduced in Louisiana. First, we used the public databases Nonindigenous Aquatic Species Database and Fishes of Texas to infer the historical distributions of these species in the US. We then used museum specimens, live specimens, and two additional databases, The Cichlid Room Companion and iNaturalist, to compare morphology and color patterns among individuals obtained from their native and introduced ranges in Mexico, Texas, and Louisiana. Our general observations found that H. cf. cyanoguttatus from Louisiana tended to have an obliquely oriented mouth and a more rounded ventral profile than H. cyanoguttatus from Texas, consistent with previous descriptions of H. carpintis, but our morphological analyses were unable to identify any significant differences among populations. Our analyses of color patterns found that H. cf. cyanoguttatus from Louisiana had larger iridescent spots than H. cyanoguttatus from Texas as well as black breeding coloration that extended anteriorly to the tip of the mouth, characters consistent with H. carpintis. Our observations indicate that at least some of the cichlids introduced in Louisiana are not H. cyanoguttatus but are instead H. carpintis, and that their presence there is likely due to release by humans. This is the first record of H. carpintis establishing a population in the US. Understanding the biology of not one, but two, species of Herichthys will be necessary to predict and mitigate their continued colonization of new environments in the US.}, keywords = {Ecology and Evolutionary Biology, Herichthys, Science, Science (General)}, doi = {https://doi.org/10.1643/i2019334}, url = {http://deepblue.lib.umich.edu/handle/2027.42/167241}, author = {Oldfield, Ronald G. and Kakuturu, Abhinav and Lutterschmidt, William L. and Lorenz, O. Tom and Cohen, Adam E. and Hendrickson, Dean~A.} } @article {oldfield_response_2021, title = {Response to Salinity Challenge in Non-native Cichlid Fishes of the Genus Herichthys Introduced in the Gulf Coast Region of the United States}, journal = {Ichthyology \& Herpetology}, volume = {109}, number = {2}, year = {2021}, month = {jul}, pages = {587{\textendash}597}, abstract = {The Rio Grande Cichlid, Herichthys cyanoguttatus, is native to northeastern Mexico and southern Texas and has been introduced at many places in the US. Recent research has indicated that the true identity of at least some populations of Herichthys cf. cyanoguttatus in Louisiana is H. carpintis and not H. cyanoguttatus. In both their native and introduced ranges, H. carpintis seems to occupy a more lowland/coastal distribution than does Herichthys cyanoguttatus, suggesting that the two species may differ physiologically or ecologically in their ability to invade new environments. Previous research has found that Herichthys cf. cyanoguttatus from Louisiana (which were most likely H. carpintis) have a high tolerance to salinity and pose a threat to both fresh and brackish waters, but the osmoregulatory capacity of H. cyanoguttatus from Texas is unknown. To determine if H. cyanoguttatus from Texas might also have a high tolerance to salinity and pose a threat to both fresh and brackish waters, we performed three experiments to assess response to salinity challenges in H. cyanoguttatus from Texas and in H. carpintis from Louisiana. In response to acute moderate salinity challenge, we found a non-significant salinity*species interaction in change in body mass, a species difference in hematocrit, and no differences in plasma chloride or osmolality. In a 120-day chronic salinity exposure, salinity concentration was inversely related to growth rate, but there was no difference in growth between the two species. In an acute challenge, high salinity concentrations had a strong negative effect on survival, but survival was not different between the two species. Both species were highly tolerant of salinity, indicating that both species might be able to use brackish waters in coastal areas to expand their ranges in the US. Finally, we found that H. cyanoguttatus from Texas spent more time swimming than did H. carpintis from Louisiana, suggesting that the two species could differ in the way they interact behaviorally with native fish communities.}, issn = {2766-1512}, doi = {10.1643/i2019334}, url = {https://doi.org/10.1643/i2019334}, author = {Oldfield, Ronald G. and Hooks, Jacob and Sommer, Jeffrey and McCain, Shelly C. and Lutterschmidt, William I. and Lorenz, O. Tom and Cohen, Adam E. and Hendrickson, Dean A.} } @article {cohen_alternative_2021, title = {An Alternative Shelving Arrangement for Natural History Collection Objects to Optimize Space and Task Efficiency}, journal = {Collection Forum}, volume = {33}, number = {1}, year = {2021}, month = {mar}, pages = {55{\textendash}72}, abstract = {A taxonomic and alphabetic arrangement (TAA) of objects on shelves has prevailed in fluid-preserved natural history collections while they were managed by scientists for their own research. Now most collections are databased and internet-accessible to facilitate very different forms of research accomplished remotely by researchers who require less physical access to specimens. The collections staff who make those data available struggle to manage collection growth with limited space and budgets, while demands on them are increasing, necessitating task and space-efficient collection management solutions. We describe an alternative arrangement of objects based on their size and catalog number (OCA) that capitalizes on modern databases. Our partial implementation of this system facilitated pragmatic between-system comparisons of space use and staff time required for routine tasks. Our OCA allows 17\% more jars to be stored in a given space than a TAA (not counting spaces left for growth), but adjusting vertical spacing of shelves could increase that to 115\%. Ten of 15 staff tasks were more efficiently accomplished in the OCA section of the collection, and we propose ways to improve efficiency for three of the four tasks for which the TAA outperformed the OCA.}, keywords = {⛔ No DOI found}, issn = {0831-4985}, doi = {http://dx.doi.org/10.26153/tsw/13255}, url = {https://doi.org/10.14351/0831-4985-33.1.55}, author = {Cohen, Adam E. and Hendrickson, Dean A. and Casarez, Melissa J.} } @inbook {capps_rivers_2021, title = {Rivers of Mexico}, booktitle = {Rivers of North America (Volume 2)}, year = {2021}, publisher = {Academic Press}, organization = {Academic Press}, address = {New York}, keywords = {Coahuila, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, MEXICO, North America, Rivers}, author = {Capps, Krista D. and Pease, Allison A. and Castillo, Maria M. and Hendrickson, Dean A. and Mendoza-Carranza, Manuel and Rodiles-Hern{\'a}ndez, Rocio}, editor = {Delong, Mike and Jardine, Tim} } @inbook {bunting_implementation_2020, title = {Implementation; Putting your stream corridor restoration plan into action}, booktitle = {Renewing Our Rivers: Stream Corridor Restoration in Dryland Regions}, year = {2020}, note = {ISBN 9780816541485}, month = {apr}, pages = {213{\textendash}311}, publisher = {The University of Arizona Press}, organization = {The University of Arizona Press}, address = {Tucson, Arizona, U.S.A.}, url = {https://uapress.arizona.edu/book/renewing-our-rivers}, author = {Bunting, D. and Bennett, J. and Caplan, T. and Garrett, Gary P. and Roberson, Amy and GimbletT, R. and Hammer, M. and Hoagstom, C. and Itami, R. and McDaniel, K.C. and Murrieta, J. and Ochoa-Espinoza, J. and Renfrow, J. and Roberson, A. and Rodriguez, A. and Sirotnak, J. and Whiterod, N. and Briggs, M.K.}, editor = {Briggs, M.K. and Osterkamp, W.R.} } @article {birdsong_conservation_2020, title = {Conservation Status of Texas Freshwater Fishes: Informing State-based Species Protections}, journal = {Journal of the Southeastern Association of Fish and Wildlife Agencies}, volume = {8}, year = {2020}, pages = {40{\textendash}52}, abstract = {In Texas, freshwater fishes recognized as State Threatened or Endangered (STE) receive special attention when Texas Parks and Wildlife Department (TPWD) consults with other agencies on projects that have the potential to alter freshwater systems. Regulatory oversight by TPWD of scientific and zoological collections, fish stockings, commercial fishing, disturbances to state-owned streambeds, and exotic species management must also ensure that no adverse impacts occur to STE freshwater fishes. Furthermore, STE species are prioritized by TPWD for voluntary-based investments in research, monitoring, habitat restoration, and habitat protection. Given these and other protections afforded to STE freshwater fishes, it is important that the lists of STE species be frequently assessed using the best available science on status, trends, and threats to species and their habitats. In 2018, TPWD adopted standardized methodologies, listing criteria, and listing thresholds to comprehensively assess the status of the diversity of species of fish, wildlife, and plants within the resource management purview and jurisdiction of TPWD. This methodology was applied to assess the status of Tex- as freshwater fishes and recommend revisions to the lists of STE species. As a result, 16 additional species of freshwater fish were recognized as STE in 2020. This article profiles the species conservation status assessment and stakeholder input processes used to identify species recommended as STE, and shares recommendations and lessons learned transferrable to other states that maintain similar state-based protected species lists.}, keywords = {⛔ No DOI found}, url = {http://www.seafwa.org/publications/proceedings/}, author = {Birdsong, Timothy W. and Garrett, Gary P. and Bean, Megan G. and Curtis, Stephen and Mayes, Kevin B. and Robertson, Sarah M.} } @article {groeschel-taylor_growth_2020, title = {Growth and Habitat Use of Guadalupe Bass in the South Llano River, Texas}, journal = {Journal of Fish and Wildlife Management}, volume = {11}, number = {1}, year = {2020}, pages = {33{\textendash}45}, abstract = {Predicting how stream fishes may respond to habitat restoration efforts is difficult, in part because of an incomplete understanding of how basic biological parameters such as growth and ontogenetic habitat shifts interact with flow regime and riverscape ecology. We assessed age-specific Guadalupe Bass Micropterus treculii habitat associations at three different spatial scales in the South Llano River, a spring-fed stream on the Edwards Plateau of central Texas, and the influence of habitat and flow regime on growth. We classified substrates using a low-cost side-scan sonar system. We used scale microstructure to determine age and to back-calculate size at age. Over 65\% of captured Guadalupe Bass were age 2 or age 3, but individuals ranged from 0 to 7 y of age. Habitat associations overlapped considerably among age classes 1{\textendash}3+, but age-0 Guadalupe Bass tended to associate with greater proportions of pool and run mesohabitats with submerged aquatic vegetation. Although habitat metrics across multiple scales did not have a large effect on growth, river discharge was negatively correlated with growth rates. Understanding age-specific Guadalupe Bass habitat associations at multiple scales will increase the effectiveness of restoration efforts directed at the species by assisting in determining appropriate ecological requirements of each life-history stage and spatial scales for conservation actions.}, issn = {1944-687X}, doi = {10.3996/022018-JFWM-015}, url = {https://meridian.allenpress.com/jfwm/article/11/1/33/436127/Growth-and-Habitat-Use-of-Guadalupe-Bass-in-the}, author = {Groeschel-Taylor, Jillian R. and Miyazono, Seiji and Grabowski, Timothy B. and Garrett, Gary P.} } @inbook {garrett_reintroduction_2020, title = {Reintroduction of the Rio Grande Silvery Minnow in the Rio Grande basin}, booktitle = {Renewing Our Rivers: Stream Corridor Restoration in Dryland Regions}, year = {2020}, pages = {292{\textendash}293}, publisher = {The University of Arizona Press}, organization = {The University of Arizona Press}, address = {Tucson, Arizona, U.S.A.}, url = {https://uapress.arizona.edu/book/renewing-our-rivers}, author = {Garrett, Gary P. and Roberson, Amy and Bennett, J.}, editor = {Briggs, M.K. and Osterkamp, W.R.} } @booklet {garrett_texas_2020, title = {The Texas Trout}, journal = {Biodiversity Blog}, year = {2020}, month = {jul}, abstract = {Today the only member of the family Salmonidae (trout, salmon and their relatives) that occurs in Texas is the non-native Rainbow Trout Oncorhynchus mykiss. That species is widely stocked around the state and there is one permanent population in McKittrick Creek, Guadalupe Mountains National Park, where it was introduced in the early 1900s. However...}, url = {https://biodiversity.utexas.edu/news/entry/the-texas-trout}, author = {Garrett, Gary P.} } @booklet {hendrickson_fish_2020, title = {Fish Collection Expands with TPWD}, journal = {UT Biodivesity Center News}, year = {2020}, note = {Library Catalog: biodiversity.utexas.edu}, month = {mar}, abstract = {A quick overview of 15 years of UT Fish Collection growth and collaborations with Texas Parks and Wildlife by Dean A. Hendrickson, Adam E. Cohen, Gary P. Garrett As stated in the Biodiversity Center{\textquoteright}s Collections webpage, the challenges for our collections are to: 1) {\textquotedblleft}document biodiversity,{\textquotedblright} 2) {\textquotedblleft}understand how biological processes generate and maintain it,{\textquotedblright} and 3) {\textquotedblleft}communicate those findings and their relevance to a broader community{\textquotedblright}. Some readers may have seen our recent post about the space issue in UT{\textquoteright}s Fish Collection. If not, in a nutshell - we now house 73,047 cataloged jars of preserved fishes containing more than 1.5 million specimens of 871 species, and our continuing growth has us now very close to our facility{\textquoteright}s capacity. We thus worry that we will soon be unable to continue addressing challenge 1, and will be lacking up-to-date data needed to continue to evaluate the status of our regional biodiversity (2 and 3).}, url = {https://biodiversity.utexas.edu/news/entry/fish-collection-expands}, author = {Hendrickson, Dean A.} } @inbook {propst_mining_2020, title = {Mining Hidden Waters: Groundwater Depletion, Aquatic Habitat Degradation, and Loss of Fish Diversity in the Chihuahuan Desert Ecoregion of Texas}, booktitle = {Standing between Life and Extinction}, year = {2020}, note = {http://web.archive.org/web/20200806221337/https://www.bibliovault.org/BV.landing.epl?ISBN=9780226694504}, pages = {125{\textendash}135}, publisher = {University of Chicago Press}, organization = {University of Chicago Press}, abstract = {Desert ecosystems are fragile and slow to recover from perturbations, and some changes may be irreparable. Exploitation of limited resources, particularly groundwater pumping, has degraded natural systems in the Chihuahuan Desert ecoregion of Texas, caused degradation of aquatic habitats, and resulted in extirpation and extinction of species and, ultimately, losses of entire ecosystems (Garrett and Edwards 2001). Deep trenching of streams by overgrazing-induced erosion has resulted in lowered water tables and further desiccation of watersheds. This contributes to spring failure, ci{\'e}nega drying, and the transformation of previously flowing streams into dry arroyos (Minckley et al. 1991).}, keywords = {archived}, isbn = {978-0-226-69433-7}, url = {https://www.bibliovault.org/BV.landing.epl?ISBN=9780226694504}, author = {Garrett, Gary P. and Bean, Megan G. and Edwards, Robert J. and Hendrickson, Dean A.}, editor = {Propst, David and Williams, Jack and Bestgen, Kevin and Hoagstrom, Christopher} } @article {mayes_preliminary_2020, title = {Preliminary Results of American Eel Sampling Efforts in Gulf of Mexico Drainages of Texas}, year = {2020}, note = {Accepted: 2020-03-10T18:50:36Z}, month = {feb}, abstract = {American Eel Anguilla rostrata has a unique and complex life history that is fairly well-studied on the eastern coast of the United States, but few studies have been done on Gulf of Mexico drainages. To inform conservation and management decisions, efforts to better understand the population structure, seasonal dynamics, and life history of American Eel are underway. The primary objectives of our efforts are to assess the current and historical distribution and abundance, habitat use, movement patterns, parasite occurrence, diet and population structure of American Eel across all life stages in Gulf of Mexico drainages of Texas. (poster presented at annual meeting of Southern Division of American Fisheries Society, Little Rock, Arkansas, February 2020)}, doi = {http://dx.doi.org/10.26153/tsw/7261}, url = {https://repositories.lib.utexas.edu/handle/2152/80242}, author = {Mayes, Kevin and Curtis, Stephen and McCoy, Grace and Hendrickson, Dean A. and Cohen, Adam E. and Casarez, Melissa and Guillen, George and Oakley, Jenny and Hansen, Justin} } @conference {curtis_value_2020, title = {The Value of Citizen Scientists: Data Collection for American Eel Using Non-Traditional Field Gear \& Social Media}, year = {2020}, note = {Accepted: 2020-02-13T19:29:32Z}, month = {jan}, abstract = {American Eel (Anguilla rostrata) is a facultative catadromous species with a unique and complex life history. After hatching, larval eel begin their journey as leptocephalus in the Sargasso Sea and drift on ocean currents along the Atlantic coast, Gulf of Mexico, and Central and South America. They transform into glass eel as they approach shore and begin to develop pigment as they settle in estuaries or move upstream into rivers as elvers. American Eel then spend 3-40+ years in these habitats as yellow eel until they sexually mature into silver eel and return to the Sargasso Sea where they spawn and presumably die. State and federal agencies, multiple universities and numerous citizen science volunteers are working to better understand their movement patterns and recruitment window in Texas. Citizen scientists with coastal chapters of the Texas Master Naturalists (TMN) have taken a lead role in assisting with this effort. Since February of 2018, TMN have established a network of monitoring sites across the mid to upper Texas Coast to sample for juvenile American Eel using eel mops. Eel mops have been deployed for various lengths of time at 29 sites throughout the past two years and checked routinely for glass and elver eel. Volunteers have conducted approximately 250 eel mop checks and provided record of their catch by category (e.g., eel, shrimp, crab, other fish, etc.) based on occurrence or abundance. TMN have documented close to 7,000 individuals across all categories with various species of crab, shrimp, and fish being the most common groups collected. While no glass or elver eel have been collected in an eel mop, TMN have provide valuable data for this project by testing a common gear type that is often used to monitor for American Eel on the Atlantic Coast.}, doi = {http://dx.doi.org/10.26153/tsw/6991}, url = {https://repositories.lib.utexas.edu/handle/2152/79966}, author = {Curtis, Stephen and Casarez, Melissa and Robertson, Sarah} } @article {hendrickson_fishes_2020, title = {Fishes of Texas Project (FoTX) Database - Darwin Core}, journal = {University of Texas at Austin, Biodiversity Collections accessed via GBIF.org}, volume = {Occurrence dataset}, year = {2020}, note = {http://web.archive.org/web/20200806221331/https://www.gbif.org/dataset/ba5b0f3a-73dd-459f-a7f1-9abc327aed00}, month = {feb}, abstract = {The Fishes of Texas Project aims to provide reliable occurrences of fishes from Texas and shared drainage basins. Starting with the database of specimens held in the University of Texas{\textquoteright} Ichthyology Collection (TNHCi) we added specimen data collected from our study area from all of the museums we could find to create the Fishes of Texas database, which can be queried via our search tools alongside documentation and other resources online (www.fishesoftexas.org). At the time of this writing the database includes data from 44 specimen holding collections, but the project has grown and will soon include data from non-specimen sources as well. The data, having come from many disparate sources, all with various formatting, were previously difficult to access and analyze as a whole. After extensive compilation, formatting, standardization, georeferencing, and specimen examining the database is a verified and specimen supported dataset for researchers interested in Texas fishes.}, keywords = {archived}, doi = {DOI10.15468/fjhjbb}, url = {DOI10.15468/fjhjbb}, author = {Hendrickson, Dean A. and Cohen, Adam E.} } @inbook {hendrickson_species_2020, title = {Species in the spotlight: Treasures of the Sierra Madre {\textendash} Mexico{\textquoteright}s little-known native trout diversity}, booktitle = {The status and distribution of freshwater fishes in Mexico}, year = {2020}, pages = {38{\textendash}41}, publisher = {IUCN and ABQ BioPark}, organization = {IUCN and ABQ BioPark}, address = {Cambridge, UK and Albuquerque, New Mexico, USA}, abstract = {Few individuals on our planet do not know what trout and salmon are. They are usually recognised as highly palatable, and often colourful species, and most who know them likely visualize cold, beautiful, pristine, free flowing, alpine or forest streams and rivers as their typical habitats. Many will also know of the remarkable migrations taken by some species, moving from their birth locations in rivers to oceans and then returning to their birthplaces to spawn and die. Some may recognise their importance as prized targets of anglers, particularly fly fishers, who spare no expenses to go after these trophies. Many others who might not be so familiar with the characteristics just mentioned may likely recognise species of this family as the tasty, and usually relatively costly fish found frozen or on ice in grocery stores and fish markets, or in cans, or smoked, or served in restaurants. Their flesh, often pink or rosy-coloured, is prized worldwide. There is no doubt that fishes in this family (Salmonidae) are well known in most of the developed and developing countries of the world and that some have become extremely economically and globally important commercial species that support large-scale recreational as well as wild commercial fisheries, and are massively produced by global aquaculture. At the same time many are also imperilled to some degree. Before this project, the Red List database contained 140 species of Salmonids. Here we{\textquoteright}ll focus on the genus Oncorhynchus, commonly known as the Pacific salmons and trout, which prior to this project was represented in the Red List by six species. Then, setting aside the many {\textquotedblleft}salmon{\textquotedblright} of this genus, we{\textquoteright}ll focus only on trout, specifically those of a large and diverse lineage, best known for one species, the famous rainbow trout (O. mykiss). Originally known only from California and other Pacific drainages of the U.S., rainbow trout have long been a prized target of anglers, and the species has been bred in captivity for at least 150 years. High demand for it for both sport fisheries, as well as wild and captive protein production, resulted in it now being established on every continent. It has become not only one of the world{\textquoteright}s most important recreational fishing species, but also one of the planet{\textquoteright}s most widely cultured vertebrates. It is effectively global agriculture{\textquoteright}s {\textquotedblleft}fish version{\textquotedblright} of the chicken, with global aquaculture production of the species in 2014 reaching 812,940 metric tonnes valued at nearly 4 billion US\$ (U.N. Food and Agriculture Organization (FAO) n.d.) That rainbow trout of global fishery and aquaculture fame is known to be one of about 10 closely related subspecies of what is called the {\textquotedblleft}coastal rainbow{\textquotedblright} branch of the evolutionary tree of the genus. Most of those are from California, but two native Mexican taxa have long been recognised as part of this lineage, O. m. nelsoni (Nelson{\textquoteright}s trout {\textendash} recently reviewed by (Ruiz Campos, 2017)) of the northernmost mountains of Baja California, and O. chrysogaster (the Mexican golden trout {\textendash} recently covered by multiple contributors (Ruiz-Luna \& Garcia De Le{\'o}n, 2016). Recent genetic studies (Abad{\'\i}aCardoso et al., 2015) confirm those relationships and reveal, from specimens collected by the bi-national group of researchers known as Truchas Mexicanas (Hendrickson et al., 2003), that Mexico{\textquoteright}s share of the diversity in this lineage is much greater. At least 10 more, still undescribed species of native trout reside in remote, rugged and isolated corners of the Sierra Madre Occidental extending as far south as the high mountains between Mazatl{\'a}n and Ciudad Durango. Truchas Mexicanas{\textquoteright} fieldwork left no doubt that most share a need for conservation actions to help their often small and fragmented populations persist, and some are critically imperilled (Camarena-Rosales et al., 2006; Hendrickson et al., 2007; Hendrickson \& Tomelleri 2019). While their formal descriptions have been delayed for various reasons, recent genetic validation of their distinctiveness, and clear need for recognition of the need for conservation actions on their behalf, led those studying them to petition the IUCN to add them to the Red List while their descriptions are being finalized. That petition was accepted and their assessments were completed as part of this project.}, url = {http://dx.doi.org/10.26153/tsw/8755}, author = {Hendrickson, Dean~A.}, editor = {Lyons, Timothy and M{\'a}iz-Tom{\'e}, Laura and Tognelli, Marcelo F. and Daniels, Adam and Meredith, Clayton and Bullock, Robert and Harrison, Ian J.} } @book {lyons_status_2020, title = {The status and distribution of freshwater fishes in Mexico}, year = {2020}, publisher = {IUCN and ABQ BioPark}, organization = {IUCN and ABQ BioPark}, edition = {1}, address = {Cambridge, UK and Albuquerque, New Mexico, USA}, abstract = {The inland waters of Mexico support a highly diverse group of freshwater fishes with high levels of endemism that occur across a broad range of aquatic habitat types. These aquatic ecosystems provide many direct (e.g., fisheries) and indirect (e.g., agricultural irrigation) benefits to people, and support local livelihoods and economies across Mexico. Freshwater ecosystems are undervalued and receive insufficient funding, political attention and protection. Developing interests and funding for freshwater species conservation is crucial for {\textquotedblleft}bending the curve{\textquotedblright} to reduce and ultimately reverse freshwater biodiversity declines. Historical disregard for the health and sustainable use of freshwater ecosystems has resulted in alarming rates of loss in the quality and availability of aquatic habitat. This report presents the most recent information on the conservation status and distribution of freshwater fishes in Mexico, and examines the stressors that are driving their declining conservation status. Important conservation actions and considerations are also presented. Five hundred and thirty-six species of freshwater fishes were assessed against the IUCN Red List Categories and Criteria, representing the most comprehensive assessment of freshwater biodiversity in Mexico to date. This assessment seeks to address the insufficient information available on freshwater fish conservation status, which has resulted in their inadequate representation in environmental planning and management. The full data set, including all species distribution maps, is freely available through the IUCN Red List website (www.iucnredlist.org). Forty percent of all extant species assessed are threatened with extinction, assuming all Data Deficient species are threatened in the same proportion as those for which enough information was available. The most pervasive threats are related to habitat loss and degradation, which is driven primarily by unsustainable water use and widespread agricultural activity. Excessive extraction of groundwater and diversion of surface water for human consumption, industrial processes, and plantation agriculture has led to widespread flow reductions, reduced water tables, and subsequent drying of aquatic habitat, which is especially prevalent in the arid, endorheic spring systems of northern and central Mexico. Mexico{\textquoteright}s vast hydroelectric infrastructure has altered the historical flow regime of many major rivers, blocking natural migration routes and fragmenting subpopulations of native fishes. Agricultural runoff, inadequate wastewater treatment, and industrial discharges have also resulted in increased levels of pollution. A number of non-native fish species have been introduced both intentionally and unintentionally throughout many of Mexico{\textquoteright}s natural and artificial surface waters, with profound impacts on native species distribution and abundance. Given the high connectivity of riverine surface waters and underlying aquifers, the impacts of these threats spread rapidly throughout freshwater ecosystems. Future conservation efforts must place greater emphasis on upstream, downstream, and lateral connectivity within water catchments. Systematic conservation planning approaches should be implemented to develop an integrated conservation action plan for freshwater fishes in Mexico, including broad stakeholder participation, environmental monitoring schemes, and the development of protected areas designed to maintain high levels of aquatic connectivity. Another priority is to direct additional research effort towards the high proportion of species assessed as Data Deficient due to insufficient information on their conservation status and distributions. This lack of information presents a significant bottleneck to the effective management and conservation of Mexico{\textquoteright}s freshwater habitats and ichthyofauna. From a policy perspective, the information presented in this report will help support the implementation of multilateral environmental agreements in Mexico, guide conservation planning and priority setting at the national and international level, and provide a baseline of conservation success in subsequent assessments of extinction risk. In addition, this new information will help efforts to achieve the targets of the UN Sustainable Development Goals (SDGs), such as: Target 6.6 for protecting and restoring water-related ecosystems; Target 6.5 on implementing integrated water resources management at all levels; Target 15.1 for conservation, restoration and sustainable use of terrestrial and inland freshwater ecosystems and their services; and Target 15.5 focused on urgent and significant action to reduce the degradation of natural habitats, halt the loss of biodiversity and, protect and prevent the extinction of threatened species. The IUCN Red List is one of the most authoritative global standards supporting policy and action to conserve biodiversity. The analysis presented in this report, based on an assessment of species Red List status, will provide new information to help guide conservation actions and development planning to safeguard the diversity of freshwater ichthyofauna in Mexico. Periodic update of IUCN Red List species assessments will enable calculation of a Red List Index of change in freshwater species extinction risk over time, which will inform managers on the conservation effectiveness of any management interventions.}, url = {https://portals.iucn.org/library/node/49039}, author = {Contreras-MacBeath, Topiltzin and Hendrickson, Dean~A. and Arroyave, Jairo and Mercado Silva, Norman and K{\"o}ck, Michael and Dom{\'\i}nguez Dom{\'\i}nguez, Omar and Vald{\'e}s Gonz{\'a}lez, Arcadio and Espinosa P{\'e}rez, H{\'e}ctor and G{\'o}mez Balandra, Mar{\'\i}a Antonieta and Matamoros, Wilfredo and Schmitter-Soto, Juan Jacobo and Soto-Galera, Eduardo and Rivas Gonz{\'a}lez, Juan Manuel and Vega-Cendejas, Mar{\'\i}a Eugenia and Ornelas-Garc{\'\i}a, Claudia Patricia and Norris, Steven M. and Mej{\'\i}a Guerrero, H{\'e}ctor Omar}, editor = {Lyons, Timothy and M{\'a}iz-Tom{\'e}, Laura and Tognelli, Marcelo F. and Daniels, Adam and Meredith, Clayton and Bullock, Robert and Harrison, Ian J.} } @inbook {propst_value_2020, title = {The Value of Specimen Collections for Conserving Biodiversity}, booktitle = {Standing between Life and Extinction}, year = {2020}, note = {http://web.archive.org/web/20200806221337/https://www.bibliovault.org/BV.landing.epl?ISBN=9780226694504}, pages = {199{\textendash}206}, publisher = {University of Chicago Press}, organization = {University of Chicago Press}, abstract = {Conservation biology is a multifaceted discipline with the primary objective of protection and perpetuation of entire natural communities and ecosystems (Soul{\'e} 1985). As such, it requires defensible and ideally verifiable information about community composition over time. Specimens held in natural history museums are the preferred form of evidence documenting historical populations because they persist in collections for hundreds of years or more. They can be examined along with original notes and labels for verification of specimen identification, location, and date of collection (Pauly 1995; SaenzArroyo et al. 2005; Lister 2011). Until humans began to preserve specimens and associated data, observations were non-verifiable and thus easily dismissed when found to conflict with other sources or opinions}, keywords = {archived}, isbn = {978-0-226-69433-7}, url = {https://www.bibliovault.org/BV.landing.epl?ISBN=9780226694504}, author = {Cohen, Adam E. and Hendrickson, Dean~A. and Garrett, Gary P.}, editor = {Propst, David and Williams, Jack and Bestgen, Kevin and Hoagstrom, Christopher} } @conference {avila_fishes_2020, title = {Fishes of Texas Project: Data Visualization and Analysis Tools}, year = {2020}, month = {jan}, abstract = {The Fishes of Texas Project (FoTX) (http://fishesoftexas.org) database currently has 124,452 specimen-vouchered occurrence records spanning \textgreater 150 years with over 400,000 new records (including non-vouchered sources such as literature, anecdotal, and photo-based) in the process of being imported. Continual data growth prompted creation of new tools to dynamically assess (as the data evolve) the state of data coverage across various dimensions to increase user understanding and accessibility to the data and improve overall utility of the project. We produced species sampling curves, temporal species accumulation graphs, and heat maps of collecting event density over time and space for each river sub-basin within Texas. A QGIS plugin was also created to better assess the suspect status of incoming records. Each type of visualization has basic documentation, easily accessible statistical summaries, flexible queries, and exploration tools to help reveal variations in sampling density over both temporal and spatial dimensions. We highlight here the San Bernard River as an example of a notably under-sampled sub-basin (as indicated by diverse forms of evidence). With addition of future records, these dynamic tools will continue to illustrate taxonomic and spatial sampling deficiencies that in turn will help guide conservation planning.}, doi = {http://dx.doi.org/10.26153/tsw/6877}, url = {https://repositories.lib.utexas.edu/handle/2152/79851}, author = {Avila, Colton and Hendrickson, Dean A. and Cohen, Adam and Casarez, Melissa} } @booklet {hendrickson_uts_2020, title = {UT{\textquoteright}s Non-Digital Biodiversity Specimens Join the Global Digital Revolution}, journal = {UT Biodiversity Center Blog}, year = {2020}, note = {http://web.archive.org/web/20200901202030/https://biodiversity.utexas.edu/news/entry/specimens-revolution; http://web.archive.org/web/20200902212518/https://biodiversity.utexas.edu/news/entry/specimens-revolution}, abstract = {The prestigious journal BioScience just released "Natural History Collections: Advancing the Frontiers of Science," a compilation of recent natural history collection-related papers that sheds light on the importance of digitizing and publishing collections data, and the substantial obstacles confronting collections staff working on that. This comes shortly after our own Curator of Entomology, Dr. Alex Wild, posted a description of his own experiences tackling these tasks in his insect collection. All of us curators in the Biodiversity Center know these obstacles all too well, having been laboring on them for decades. As Dr. Wild pointed out, we{\textquoteright}re making progress despite major limitations, and his collection now being 1\% digitized, though perhaps sounding trivial to some, is indeed a major accomplishment. Here, I{\textquoteright}ll provide a broader perspective, exploring all of our collections combined, since, at long last, I finally can! All of our data from all four primary Biodiversity Center collections are now easily explored anywhere in the world via a single online portal - the international GBIF.org (Global Biodiversity Information Facility).}, keywords = {archived}, url = {https://biodiversity.utexas.edu/news/entry/specimens-revolution}, author = {Hendrickson, Dean A.} } @inbook {garrett_chihuahuan_2019, title = {Chihuahuan Desert Native Fish Conservation Areas: A multispecies and watershed approach to preservation of freshwater fish diversity}, booktitle = {Multispecies and Watershed Approaches to Freshwater Fish Conservation}, series = {American Fisheries Society Symposium}, volume = {91}, year = {2019}, pages = {231{\textendash}252}, publisher = {American Fisheries Society}, organization = {American Fisheries Society}, address = {Bethesda, Maryland, USA}, abstract = {With 95\% of the land in Texas privately owned, conservation of the aquatic resources is particularly daunting and is exemplified by the fact that 48\% of the 191 native freshwater fishes in Texas are now of conservation concern. Partnerships with private landowners is not only sensible, but often the only way to achieve long-term conservation goals. In the Chihuahuan Desert region of Texas, 55\% of the native fishes are of conservation concern or already lost to extirpation or extinction. Although there are numerous contributing factors, habitat degradation and loss are the primary culprits. For decades, research and restoration have focused on some of the more imperiled species and their habitats. From reestablishing ci{\'e}negas, to landowner partnerships, to Conservation Agreements, much has been accomplished. Unfortunately, the challenges increase faster than our accomplishments. Our latest, and most promising, approach has been to develop six Native Fish Conservation Areas in the Chihuahuan Desert. These NFCAs represent an ecologically-focused conservation prioritization of watershed segments that serve as native fish {\textquotedblleft}strongholds{\textquotedblright} and they function as priority areas for conservation investments to promote integrated, holistic conservation strategies that enable the long-term persistence of freshwater biodiversity. Current and future conservation of aquatic resources in Texas emphasizes a landscape-scale approach, working primarily with private landowners to provide conservation best management practices and support on-the-ground projects to maintain or restore habitats to sustain functional ecosystems.}, url = {https://f1000research.com/slides/8-2058}, author = {Garrett, Gary and Birdsong, Timothy and Bean, Megan and Labay, Benjamin J.}, editor = {Dauwalter, Daniel C. and Birdsong, Timothy W. and Garrett, Gary P.} } @article {hendrickson_iucn_2019-4, title = {IUCN Red List of Threatened Species: Cyprinella xanthicara}, journal = {IUCN Red List of Threatened Species}, number = {e.T6141A3104687}, year = {2019}, abstract = {Established in 1964, the IUCN Red List of Threatened Species has evolved to become the world{\textquoteright}s most comprehensive information source on the global conservation status of animal, fungi and plant species.}, doi = {10/gjfzms}, url = {https://www.iucnredlist.org/en}, author = {Hendrickson, Dean A.} } @article {hendrickson_iucn_2019-5, title = {IUCN Red List of Threatened Species: Cyprinodon pisteri}, journal = {IUCN Red List of Threatened Species}, number = {e.T191305A1975352}, year = {2019}, abstract = {Established in 1964, the IUCN Red List of Threatened Species has evolved to become the world{\textquoteright}s most comprehensive information source on the global conservation status of animal, fungi and plant species.}, doi = {10/gjfzmt}, url = {https://www.iucnredlist.org/en}, author = {Hendrickson, Dean A. and Gonzales, Arcadio Valdes and Norris, Steven} } @article {perezmiranda_iucn_2019, title = {IUCN Red List of Threatened Species: Herichthys minckleyi}, journal = {IUCN Red List of Threatened Species}, number = {e.T4836A3012480}, year = {2019}, abstract = {Established in 1964, the IUCN Red List of Threatened Species has evolved to become the world{\textquoteright}s most comprehensive information source on the global conservation status of animal, fungi and plant species.}, doi = {10/gjfzmv}, url = {https://www.iucnredlist.org/en}, author = {P{\'e}rez-Miranda, Fabian and Guerrero, Omar Mej{\'\i}a and Hendrickson, Dean A.} } @booklet {lyons_exploring_2019, title = {Exploring the Distribution of Groundwater Salamanders and Catfish with Environmental DNA}, number = {Contract \#504920}, year = {2019}, month = {oct}, pages = {29}, publisher = {University of Texas at Austin}, type = {Final Performance Report}, address = {Austin, Texas, U.S.A.}, abstract = {We designed and tested environmental-DNA (eDNA) probes to identify the presence of species of groundwater salamanders (genus Eurycea) and the Mexican blindcat (Prietella phreatophila) from environmental samples. Environmental samples were screened for the target species using the eDNA probes and quantitative PCR (qPCR). Custom probes were designed to amplify species-specific regions of the mitochondrial cytochrome b gene. A new cytochrome b gene tree was created to ensure full probe coverage of all the recently revised central Texas Eurycea species. Probes were optimized and tested on tissue samples of Eurycea and P. phreatophila species. We developed successful probes for each of the described, as well as the known but undescribed, species of central Texas Eurycea (is a few cases, one probes detects a few closely related species), and for P. phreatophila. We confirmed that these probes are highly species-specific, so they can be used not just for detection of Eurycea, but for species identication. Twenty-six sites across central Texas and Coahuila, Mexico, were subjected to water sampling for the purposes of environmental DNA (eDNA) analysis. These springs, caves, and wells were potential sites for karst aquifer-dwelling salamanders (genus Eurycea) and Mexican blindcat (Prietella phreatophila). To detect the presence of these rare species, volumes of water were pumped through a fine filter which was returned to a lab at the University of Texas - Austin. A DNA extraction was promptly performed on each filter to yield an eDNA sample. The presence of P. phreatophila was detected at a known site for the species in Val Verde County, Texas, validating both the detection method and the molecular probe. Eurycea sp. 1 was detected at a new spring for the species close to a known sample site. An additional positive control site was Eliza Spring of the Barton Springs complex, where E. sosorum was detected. However, we did not detect the target species at several other sites of known occurrence. We conclude that positive results (the presence of a species) are meaningful (we detected no false negatives), but negative results (no species detection) do not necessarily mean that the target species is not present (we did sample known localities for the target species that produced false negatives).}, author = {Lyons, Kathleen and Hillis, David M.} } @article {hendrickson_iucn_2019-3, title = {IUCN Red List of Threatened Species: Cyprinodon bifasciatus}, journal = {IUCN Red List of Threatened Species}, number = {e.T6147A3104843}, year = {2019}, abstract = {Established in 1964, the IUCN Red List of Threatened Species has evolved to become the world{\textquoteright}s most comprehensive information source on the global conservation status of animal, fungi and plant species.}, keywords = {⛔ No DOI found}, url = {https://www.iucnredlist.org/en}, author = {Hendrickson, Dean A. and Gonzales, Arcadio Valdes} } @article {hendrickson_iucn_2019-1, title = {IUCN Red List of Threatened Species: Dionda argentosa}, journal = {IUCN Red List of Threatened Species}, number = {e.T191262A130199481}, year = {2019}, abstract = {Established in 1964, the IUCN Red List of Threatened Species has evolved to become the world{\textquoteright}s most comprehensive information source on the global conservation status of animal, fungi and plant species.}, doi = {10/gjfzmp}, url = {https://www.iucnredlist.org/en}, author = {Hendrickson, Dean A.} } @article {hendrickson_iucn_2019-2, title = {IUCN Red List of Threatened Species: Gila eremica}, journal = {IUCN Red List of Threatened Species}, number = {e.T191266A1974611}, year = {2019}, abstract = {Established in 1964, the IUCN Red List of Threatened Species has evolved to become the world{\textquoteright}s most comprehensive information source on the global conservation status of animal, fungi and plant species.}, doi = {10/gjfzmq}, url = {https://www.iucnredlist.org/en}, author = {Hendrickson, Dean A. and Norris, Steven} } @article {matamoros_iucn_2019, title = {IUCN Red List of Threatened Species: Xiphophorus gordoni}, journal = {IUCN Red List of Threatened Species}, number = {e.T23157A2784873}, year = {2019}, abstract = {Established in 1964, the IUCN Red List of Threatened Species has evolved to become the world{\textquoteright}s most comprehensive information source on the global conservation status of animal, fungi and plant species.}, keywords = {⛔ No DOI found}, url = {https://www.iucnredlist.org/en}, author = {Matamoros, Wilfredo and Hendrickson, Dean A. and Vega-Cendejas, Maria} } @article {hendrickson_oncorhynchus_2019-11, title = {Oncorhynchus chrysogaster}, journal = {The IUCN Red List of Threatened Species}, volume = {2019}, number = {e.T142674122A145641611}, year = {2019}, note = {Number: e.T142674122A145641611 Reporter: The IUCN Red List of Threatened Species}, month = {dec}, abstract = {TAXONOMIC NOTES The taxon Oncorhynchus chrysogaster currently includes the drainages of the r{\'\i}os Fuerte, Sinaloa, and Culiac{\'a}n. Here we treat only the R{\'\i}o Fuerte subpopulations as O. chrysogaster. Sinaloa and Culiac{\'a}n subpopulations are different phenotypically from each other and from those subpopulations in the Fuerte watershed. JUSTIFICATION This species is known from a number of localities within the Urique, Loera, and Verde sub-basins in Chihuahua, Mexico. Its extent of occurrence (EOO) is estimated to be 3,289 km{\texttwosuperior} and its area of occupancy (AOO) is estimated to be 44 km{\texttwosuperior}. Anecdotal evidence suggests population decline and possible extirpation in some areas where this species. However, it is still considered common in the R{\'\i}o Verde and Loera sub-basins. Primary threats include deforestation, livestock overgrazing, hybridization with Rainbow Trout, and localized fishing pressure. Therefore, this species is assessed as Near Threatened (NT) because it meets the threshold for a threatened category under B1 and B2 and there is evidence of continuing decline in the area, extent, and quality of available habitat, but it occurs in more than 10 locations, the population is not severely fragmented, and currently there is no evidence of major range-wide population decline. GEOGRAPHIC RANGE INFORMATION This species is known from 22 localities and more than 10 locations in the sub-basins Urique, Loera, and Verde in Chihuahua, Mexico. It is found in headwater streams of all three sub-basins and in the mainstem of the R{\'\i}o Verde above about 1,900 m. The R{\'\i}o Verde and its tributaries have the largest populations of this trout. Arroyo las Truchas in the Loera basin also has a strong population. Extent of occurrence (EOO) for the species is estimated to be 3,289 km{\texttwosuperior} and area of occupancy (AOO) is estimated to be 44 km{\texttwosuperior}. The population is not considered to be severely fragmented. POPULATION INFORMATION Total population size is unknown for this species. Range-wide population trend is unknown, but it is suspected to be declining at a rate that precludes this species from being assessed in a threatened category under criterion A. Mexican Golden Trout are rare and possibly have been eliminated from the upper Urique basin. Trout in the Los Loera system are common in the Arroyo las Truchas, but other streams in that area have not been surveyed. The R{\'\i}o Verde sub-basin populations appear to be stable. Trout are rare in Arroyo San Vincente, and appear different phenotypically from the rest of the basin. The R{\'\i}o Verde and its tributaries have the largest populations of this trout. Arroyo las Truchas in the Loera basin also has a strong population. HABITAT AND ECOLOGY INFORMATION Mexican Golden Trout prefers cold, clear streams above 1,900 m altitude. Their preference appears to be for deeper water beneath boulders and undercuts. Spawning individuals have been taken in mid-February. The specific habitat uses, basic life history, and basic ecology of this species are uncertain and require additional research. THREATS INFORMATION There are multiple threats to the Mexican Golden Trout. Habitat degradation from the effects of overgrazing and logging is principal. These activities cause siltation and warming of the stream waters, and increase flash flooding which can disturb spawning regimens. The R{\'\i}o Verde populations are easily accessed from the highway and are subject to exploitation by anglers. Grow-out facilities in the Fuerte basin are common and Rainbow Trout (Oncorhynchus mykiss) escape from these operations is likely to lead to introgression. To date we have not collected any Mexican Golden Trout that we suspected were hybridized with Rainbow Trout. Future genetic introgression with Rainbow Trout is expected, given government initiatives that promote the development of hatcheries within the region. USE AND TRADE INFORMATION This species is not traded. It is occasionally targeted in subsistence and sport fisheries. However, the magnitude of harvest is unknown. CONSERVATION ACTIONS INFORMATION Currently there are no species-specific conservation measures directed towards Mexican Golden Trout. Recommended conservation actions include implementation of harvest limits in the Rio Verde, and education and encouragement of of cattle ranchers to reduce accessibility to riparian vegetation. More information regarding population size, population trend, and the impacts of major threats would be useful in guiding future conservation action.}, doi = {https://dx.doi.org/10.2305/IUCN.UK.2019-3.RLTS.T142674122A145641611.en}, url = {https://www.iucnredlist.org/species/142674122/145641611}, author = {Hendrickson, Dean~A. and Tomelleri, Joseph R.} } @article {hendrickson_oncorhynchus_2019-10, title = {Oncorhynchus sp. nov. {\textquoteright}Acaponeta Trout{\textquoteright}}, journal = {The IUCN Red List of Threatened Species}, volume = {2019}, number = {e.T142674476A145641646}, year = {2019}, note = {Number: e.T142674476A145641646 Reporter: The IUCN Red List of Threatened Species}, month = {dec}, abstract = {TAXONOMIC NOTES There is evidence that most populations of native Acaponeta trout are likely to be introgressed with Rainbow Trout. JUSTIFICATION This species is known only from the headwaters of four streams (arroyos los Metates, Cebollas, Tanquecitos, and Las Moras) at high elevation in the Sierra Madre Occidental, Durango, Mexico. Severe population fragmentation is likely, given the most widespread and major threat to this species is genetic introgression with Rainbow Trout. Its area of occupancy (AOO) and extent of occurrence (EOO) are both highly restricted and this species is not thought to occur in more than four locations. Decline in the number of mature individuals, as well as continued decline in EOO and AOO are inferred. As such, this species is listed as Critically Endangered (CR) under criterion B2ab(i,ii,iii,v). GEOGRAPHIC RANGE INFORMATION This species is known only from the headwaters of four streams (arroyos los Metates, Cebollas, Tanquecitos, and Las Moras) at high elevation in the Sierra Madre Occidental, Durango, Mexico. Area of occupancy (AOO) for the species is estimated at 8 km{\texttwosuperior} and its extent of occurrence (EOO) is estimated at 187 km{\texttwosuperior}, based on available georeferenced point records. Both EOO and AOO are inferred to be in decline due to introgression with Rainbow Trout (Oncorhynchus mykiss). This species occurs at four locations, given that the spread of Rainbow Trout is likely to affect each stream separately. POPULATION INFORMATION There is no information regarding trends of the populations. This species was common at Tanquecitos and las Cebollas. Given its highly restricted range, total population size is suspected to be small. HABITAT AND ECOLOGY INFORMATION This species occurs only in headwater streams in the R{\'\i}o Acaponeta watershed. Elevation of habitat ranges from 2,300-2,800 m asl. The specific habitat uses, basic life history, and basic ecology of this species are uncertain and require additional research. THREATS INFORMATION The unique phenotype of the Acaponeta trout shows the population to have a native component that is in danger of introgression with Rainbow Trout (Oncorhynchus mykiss). Future genetic introgression with Rainbow Trout is expected, given government initiatives that promote the development of hatcheries within the region. USE AND TRADE INFORMATION This species is not utilized. CONSERVATION ACTIONS INFORMATION There are no conservation actions currently in place. Education of the populace about the native trout regarding the potential impact of introgression may be an effective course of action. Additionally, more research regarding distribution, population size, and population trend would be useful in guiding future conservation action.}, doi = {https://dx.doi.org/10.2305/IUCN.UK.2019-3.RLTS.T142674476A145641646.en}, url = {https://www.iucnredlist.org/species/142674476/145641646}, author = {Hendrickson, Dean~A. and Tomelleri, Joseph R.} } @article {hendrickson_oncorhynchus_2019-9, title = {Oncorhynchus sp. nov. {\textquoteright}Culiac{\'a}n Golden Trout{\textquoteright}}, journal = {The IUCN Red List of Threatened Species}, volume = {2019}, number = {e.T142674166A145641621}, year = {2019}, note = {Number: e.T142674166A145641621 Reporter: The IUCN Red List of Threatened Species}, month = {dec}, abstract = {TAXONOMIC NOTES The Culiac{\'a}n Trout is phenotypically and meristically distinct from Oncorhynchus chrysogaster in the rios Fuerte and Sinaloa. JUSTIFICATION The Culiac{\'a}n trout is restricted to headwater streams in the R{\'\i}o Culiac{\'a}n basin, Chihuahua and Durango, Mexico and occurs in no more than six locations. This species can be locally common, however, collection localities are few and far between. Localized threats include logging and livestock grazing, both of which have resulted in a continued decline in the extent, area, and quality of available habitat. Subpopulations are fragmented and cannot intermix due to thermal barriers in main river channels. Total population size has been severely diminished in the last 40 years and continuing decline in the number of mature individuals is inferred, but exact estimates of decline are unknown. Its extent of occurrence (EOO) and area of occupancy (AOO) are both highly restricted. Therefore, this species is assessed as Endangered (EN) under criterion B1ab(i,ii,iii,v)+2ab(i,ii,iii,v). GEOGRAPHIC RANGE INFORMATION This species is restricted to headwater tributaries in the R{\'\i}o Culiac{\'a}n basin. It is most common in arroyos Agua Blanca, El Desecho, and El R{\'\i}o. Extent of occurrence (EOO) for this species is estimated to be 207 km{\texttwosuperior} and area of occupancy (AOO) is estimated to be 14 km{\texttwosuperior}, based on current collection records. Continued decline of both EOO and AOO is inferred, based on a reduction in the quality, area, and extent of suitable habitat. This species occurs in fewer than 10 subpopulations and is restricted to no more than six locations. Habitat is restricted to elevations between 2,300-2,800 m asl. POPULATION INFORMATION There is no information available about population trends as no collection sites have been revisited in recent years. This species can be locally common, however, collection localities are few and far between. Total population size is suspected to be less than 1000 with approximately 200 individuals in the largest subpopulation.. Thermal barriers in the mainstem rivers prevent movement of the trout between headwater streams, and therefore subpopulations are considered severely fragmented. HABITAT AND ECOLOGY INFORMATION Virtually nothing is known of the biology of this species. They inhabit clear, cold headwater streams, particularly between 2,300-2,800 m asl. THREATS INFORMATION Localized threats include deforestation of the watershed through logging/road building and grazing of livestock in the riparian. These threats have resulted in an observed reduction in the area, extent, and quality of suitable habitat. Logging and grazing increase silt loads in the stream and decrease clarity of the water and have the potential to smother spawning gravels. Future genetic introgression with rainbow trout is expected, given government initiatives that promote the development of hatcheries within the region. USE AND TRADE INFORMATION This species is not utilized. CONSERVATION ACTIONS INFORMATION There are currently no known conservation actions in place. Education of the local people about the native trout is likely to be the most effective from of mitigation. Additionally, more research regarding distribution, total population size, population trend, and the magnitude of threats would be useful in guiding future conservation action.}, doi = {https://dx.doi.org/10.2305/IUCN.UK.2019-3.RLTS.T142674166A145641621.en}, url = {https://www.iucnredlist.org/species/142674166/145641621}, author = {Hendrickson, Dean~A. and Tomelleri, Joseph R.} } @article {hendrickson_oncorhynchus_2019-7, title = {Oncorhynchus sp. nov. {\textquoteright}Mayo Trout{\textquoteright}}, journal = {The IUCN Red List of Threatened Species}, volume = {2019}, number = {e.T142674103A145641606}, year = {2019}, note = {Number: e.T142674103A145641606 Reporter: The IUCN Red List of Threatened Species}, month = {dec}, abstract = {TAXONOMIC NOTES The Mayo trout is most closely related to the Yaqui trout. JUSTIFICATION The Mayo Trout is restricted to four streams (13 collection localities) and is abundant only in one location. This location is a headwater stream that is threatened by mining interests. Additional threats include subsistence harvest, human encroachment, and subsequent declines in water quality and habitat availability. Subpopulations are fragmented and cannot intermix. Total population size has been severely diminished in the last 40 years and continuing decline in the number of mature individuals is inferred, but exact estimates of decline are unknown. Its extent of occurrence (EOO) and area of occupancy (AOO) are both highly restricted. Therefore, this species is assessed as Endangered (EN) under criterion B1ab(i,ii,iii,v)+2ab(i,ii,iii,v). GEOGRAPHIC RANGE INFORMATION This species is restricted to small streams above Basaseachi falls, and to a few headwater streams (above 2,000 m) that intersect the R{\'\i}o Mayo below the falls. One individual was collected below Basaseachi in 2008 (L. Findley Pers. Comm. 2008). Arroyo El Conche{\~n}o appears to have the strongest population. Extent of occurrence (EOO) for the species is estimated to be 240 km{\texttwosuperior} and area of occupancy (AOO) is estimated to be 26 km{\texttwosuperior}; both are inferred to be declining due to adjacent mining activity, human encroachment, subsistence harvest, and reductions in habitat quality. This species is reported from 13 collection localities. However, threats are acting at the stream scale and the number of locations is unlikely to exceed four. POPULATION INFORMATION The Mayo Trout is rare throughout its range. Cursory surveys show it to be common only in Arroyo El Conche{\~n}o. The species is decreasing in abundance above Basaseachi falls because of developments and encroachment of civilization. Severe fragmentation is inferred based on habitat type and dispersal ability. HABITAT AND ECOLOGY INFORMATION The Mayo Trout needs cold, clear water. Virtually nothing is known of the spawning habits or behavior of this species. THREATS INFORMATION Mining is a threat to the Mayo Trout in Arroyo El Conche{\~n}o. Effluent from new mining efforts have killed much of the aquatic life immediately downstream of a mine on El Conche{\~n}o. There are still trout immediately above a waterfall that is adjacent to the mine. Mayo trout are uncommon above Basaseachi falls, are absent from the mainstem of the river, and are decreasing in the headwaters due to encroaching civilization and developments along the streams. Water quality and catch from local anglers are affecting the populations. Future genetic introgression with rainbow trout is expected, given government initiatives that promote the development of hatcheries within the region. USE AND TRADE INFORMATION This species may occasionally be taken in subsistence fisheries. CONSERVATION ACTIONS INFORMATION There are currently no conservation actions in place. It is imperative that mining not be expanded on Arroyo El Conche{\~n}o. Education of the local populace may be of help in preserving the small populations above Basaseachi. Additionally, more research regarding distribution, population size, population trend, life history and ecology, and the magnitude of threatening factors will be useful in guiding future conservation action.}, doi = {https://dx.doi.org/10.2305/IUCN.UK.2019-3.RLTS.T142674103A145641606.en}, url = {https://www.iucnredlist.org/species/142674103/145641606}, author = {Hendrickson, Dean~A. and Tomelleri, Joseph R.} } @article {hendrickson_oncorhynchus_2019-8, title = {Oncorhynchus sp. nov. {\textquoteright}Northern Conchos Trout{\textquoteright}}, journal = {The IUCN Red List of Threatened Species}, volume = {2019}, number = {e.T145640871A145641651}, year = {2019}, note = {Number: e.T145640871A145641651 Reporter: The IUCN Red List of Threatened Species}, month = {dec}, abstract = {TAXONOMIC NOTES Undescribed species. Affinity appears to be with Yaqui trout in the adjacent basin, but genetic work shows this trout to be unique. JUSTIFICATION Extensive surveys show the trout to occupy only one section of a tiny headwater stream in the Hojasichi sub-basin of the R{\'\i}o Conchos. Habitat is evidently restricted to 1 km of stream and the population has not expanded its range in the past 14 years, despite some protections. the total population size is unlikely to exceed 250 individuals. Threats include fishing pressures, livestock overgrazing, and inbreeding. Given its highly restricted extent of occurrence and area of occupancy, an observed decline in the area, extent, and quality of available habitat in the recent past, and expected future declines, this species is assessed as Critically Endangered (CR) under criterion B1ab(iii)+2ab(iii). GEOGRAPHIC RANGE INFORMATION This species is currently known from about 1 km of stream in the Hojasichi sub-basin of the R{\'\i}o Conchos. Its extent of occurrence (EOO) does not exceed 2.33 km{\texttwosuperior} (although for the purpose of the Red List assessment, this measurement is raised to 4 km{\texttwosuperior} to ensure the EOO is not smaller than the area of occupancy). Its area of occupancy (AOO) is 4 km{\texttwosuperior} (but the actual area occupied by the species does not exceed 2 km{\texttwosuperior}). It occurs in one location. John Woodhouse Audubon (1906) mentioned trout in the Conchos basin seen during his 1849 overland trip through Chihuahua. POPULATION INFORMATION Pennington (1963) described a fish which could only be referred to trout, while studying the culture of the Rar{\'a}muri near Sisoguichi. Anecdotal reports of "aparique" (trout) are frequently reported by the indigenous Rar{\'a}muri, but they typically mention that they haven{\textquoteright}t seen the fish for 10 or 20 years. Flechsig noted that residents of Panalachi told him of existence of a trout but were unable to produce the fish because of severe drought in the early 1950s (A. Flechsig Pers. Comm. 2004). We found native trout in 2005 near Panalachi, but subsequent trips to that site over the next 11 years failed to produce any trout. A tiny population was found in a remote stream to the north of Panalachi in 2006. That population is restricted to about 1 km of stream in a remote area, but appears not to be expanding it{\textquoteright}s range, and is the only known population of this species despite repeated efforts to find more. Total population size is unlikely to exceed 250 mature individuals. HABITAT AND ECOLOGY INFORMATION This species is currently thought to be restricted to a single headwater stream in the northern R{\'\i}o Conchos, excluding the R{\'\i}o Balleza sub-basin. Historical reports suggest it was more widespread in the upper Conchos proper. The single location where this species occurs is between an elevation of 2350-2400 masl. Basic life history and basic ecology are uncertain and require additional research. THREATS INFORMATION Historical declines are the result of overfishing, particularly anglers that take the fish by poisoning the waters, either with clorox, lime, or poisonous roots. Overgrazing by livestock has degraded stream banks and helped to eliminate the fish from most of its former range. Currently, these are not considered major threats to this population because access to the public and livestock is restricted. However, a recent trip showing some fish with a severe overbite suggests that the population has become inbred. Use of detergents in the streams by native peoples washing clothes may also have contributed to the reduction in range of this species. Future genetic introgression with rainbow trout is expected, given government initiatives that promote the development of hatcheries within the region. USE AND TRADE INFORMATION Historically, this species was targeted by subsistence fisheries through the use of clorox, lime, and other indiscriminate fishing methods. Currently, there is no known trade in this taxon. CONSERVATION ACTIONS INFORMATION Currently the species is known to subsist only in one stream, a northerly flowing tributary to the R{\'\i}o Hojasichi. Sections of this stream are crudely fenced with barbed wire to keep livestock out of the riparian, and there is currently a "streamkeeper" (hired by the WWF) that lives on the stream to control public access. Continued site protection is imperative to the survival of this species. Future conservation should seek to employ habitat restoration, species recovery, and education and awareness initiatives.}, doi = {https://dx.doi.org/10.2305/IUCN.UK.2019-3.RLTS.T145640871A145641651.en}, url = {https://www.iucnredlist.org/species/145640871/145641651}, author = {Hendrickson, Dean~A. and Tomelleri, Joseph R.} } @article {hendrickson_oncorhynchus_2019-5, title = {Oncorhynchus sp. nov. {\textquoteright}Baluarte Trout{\textquoteright}}, journal = {The IUCN Red List of Threatened Species}, volume = {2019}, number = {e.T142674469A145641641}, year = {2019}, note = {Number: e.T142674469A145641641 Reporter: The IUCN Red List of Threatened Species}, month = {dec}, abstract = {TAXONOMIC NOTES Some museum specimens appear to be introgressed with Rainbow Trout. JUSTIFICATION This species is currently known only from three localities in the headwaters of the Baluarte watershed. Total population size and population trend are unknown as there have been no repeat collections at any sites within the Baluarte, and the purity (extent of ingression) of current collections are uncertain. Severe population fragmentation is likely, given the most widespread and major threat to this species is genetic introgression with Rainbow Trout (Oncorhynchus mykiss). Its area of occupancy (AOO) and extent of occurrence (EOO) are both highly restricted and this species is not thought to occur in more than three locations. Decline in the number of mature individuals, as well as continued decline in EOO and AOO are inferred. As such, this species is listed as Critically Endangered (CR) under criterion B2ab(i,ii,iii,v). Additional field research in the Baluarte watershed may find more native populations. More information regarding population status, distribution, and the impact of introgression would be useful in guiding future conservation action. GEOGRAPHIC RANGE INFORMATION This species is known only from three collection localities in the Sierra Madre Occidental, Durango, Mexico. Arroyo Santa Barbara represents the largest subpopulation. at high elevation in the Sierra Madre Occidental, Durango, Mexico. The area of occupancy (AOO) for the species is estimated at 6 km{\texttwosuperior} and its extent of occurrence (EOO) is estimated at 113 km{\texttwosuperior}, based on available georeferenced point records, and both are inferred to be declining based on apparent introgression with Rainbow Trout (Oncorhynchus mykiss). We expect that more field research in the Baluarte watershed would find additional native populations. POPULATION INFORMATION There is insufficient information to establish trends regarding the population status of this species. It is suspected that the pure populations of Baluarte trout are under threat of introgression with introduced Rainbow Trout. HABITAT AND ECOLOGY INFORMATION This species is restricted to the headwaters of the Baluarte watershed in the Sierra Madre Occidental. Elevation ranges from 2,500-2,700 m asl. Basic life history and basic ecology are uncertain and require additional research. THREATS INFORMATION The presence of, and introgression with native Rainbow Trout (Oncorhynchus mykiss) is an immediate threat to the species, and is expected to have resulted in declines in the extent of occurrence, area of occupancy, habitat quality, and the number of remaining mature individuals. Future genetic introgression with Rainbow Trout is expected, given government initiatives that promote the development of hatcheries within the region. USE AND TRADE INFORMATION There is no known trade in this fish CONSERVATION ACTIONS INFORMATION No conservation actions currently in place. One reasonable option would be to isolate a native population and try to reproduce that in a troutless stream that is inaccessible to upstream movement of Rainbow Trout. Additionally, more research regarding distribution, population status, and the effects of introgression are needed.}, doi = {https://dx.doi.org/10.2305/IUCN.UK.2019-3.RLTS.T142674469A145641641.en}, url = {https://www.iucnredlist.org/species/142674469/145641641}, author = {Hendrickson, Dean~A. and Tomelleri, Joseph R.} } @article {hendrickson_oncorhynchus_2019-2, title = {Oncorhynchus sp. nov. {\textquoteright}Bavispe Trout{\textquoteright}}, journal = {The IUCN Red List of Threatened Species}, volume = {2019}, number = {e.T142673841A145641601}, year = {2019}, note = {Number: e.T142673841A145641601 Reporter: The IUCN Red List of Threatened Species}, month = {dec}, abstract = {TAXONOMIC NOTES The Yaqui Trout is the only native salmonid in the R{\'\i}o Yaqui watershed. There is some evidence that the Yaqui trout in the Bavispe, Papigochi and the Tutuaca sub-basins are differentiated from each other phentotypically. Rainbow trout are raised as food in grow-out facilities in the Yaqui basin, and have escaped into the wild. Hybridization with the Yaqui trout has occurred but is of localized occurrence. JUSTIFICATION The Yaqui Trout occurs in a number of locations throughout the Yaqui and Guzm{\'a}n basins at elevations ranging from 1,600-2,200 m above sea level. Extent of occurrence (EOO) for this species is estimated to be 7,339 km{\texttwosuperior} and area of occupancy (AOO) is estimated to be 120 km{\texttwosuperior}. Population size is unknown, but presumably exceeds 10,000. Population trend is suspected to be stable or declining at a rate that precludes this species from being listed under a threatened category under criterion A. Subpopulations are not considered fragmented, given a higher thermal tolerance when compared to close congeners, and the ability to disperse through thermal barriers in lower elevation, mainstem rivers. Localized threats include deforestation and livestock overgrazing which have resulted in increased runoff, siltation, and higher stream temperatures, hybridization with rainbow trout, and mild fishing pressure. However, many of the localities where this species occurs are isolated and difficult to access. Therefore, this species is assessed as Near Threatened (NT), because it meets the thresholds for a threatened category under criteria B1 and B2 and there is evidence of decline in the area, extent and quality of habitat, but it occurs in greater than 10 localities and subpopulations are not fragmented. GEOGRAPHIC RANGE INFORMATION Yaqui Trout are common in the Bavispe and Tutuaca sub-basins, and in tributaries of the R{\'\i}o Tomochi (Papigochi sub-basin). The Bavispe has more than a dozen arroyos with strong and stable populations with Arroyo Yenquin and Arroyo Nutria being among the best. Habitat extends from headwaters to about 1,600 m asl. In general, the watershed appears to be among the best in Chihuahua/Sonora from an overall management perspective. Extent of occurrence (EOO) for this species is estimated to be 7,339 km{\texttwosuperior} and area of occupancy is estimated to be 120 km{\texttwosuperior}, based on known collection localities. Threats are localized and expected to affect localities independently. Therefore, the number of locations where this species occurs exceeds 10. POPULATION INFORMATION Total population size is unknown but presumably exceeds 10,000. Population trend is suspected to be stable or slowly declining, principally because the watershed is sparsely settled and there is not a lot of fishing pressure on the species. A "duplicate" subpopulation exists in the Guzman basin to the east, having been transplanted there from the Bavispe sub-basin in the early 1900s. Subpopulations are not considered fragmented, given an potentially higher thermal tolerance for warm water and capabilities to disperse through and even live within lower elevation mainstem rivers. HABITAT AND ECOLOGY INFORMATION This species typically occupies small, cold water tributaries with northerly or eastward flow. Major tributaries are often thermal barriers to dispersal for close congeners. However, because the Yaqui trout may exhibit some tolerance to warmer waters, it is occasionally found in mainstem rivers such as rios Tomochi and Gavilan at lower altitudes (1,600 m asl). Basic life history and basic ecology are uncertain and require additional research. THREATS INFORMATION The principal threat to Yaqui Trout is logging and associated runoff. While there is no known instance of clear cutting in the area, extensive logging in the mid-1900s prompted Aldo Starker Leopold to remark that the R{\'\i}o Gavilan had undergone extensive degradation, including sawdust in runoff and flash flooding. Removal of streamside trees also contributes to warming of the stream waters. Trout generally require higher dissolved oxygen than other native fishes, and are therefore particularly susceptible to warming waters. Some pastures are overgrazed which also contributes to flash flooding of streams and rivers and can interrupt spawning and decrease visibility in the streams. Hybridization with non-native Rainbow Trout is a concern, and could eventually lead to widespread introgression. Currently, hybrids are uncommon and are localized near grow-out facilities for Rainbow Trout. Future genetic introgression with rainbow trout is expected, given government initiatives that promote the development of hatcheries within the region. USE AND TRADE INFORMATION There is no known trade of the taxon. It is occasionally targeted in subsistence fisheries. However, fishing pressure at these localities is low because human development is sparse and localities are sometimes remote. CONSERVATION ACTIONS INFORMATION There are currently no species-specific conservation actions in place. Good forest management (e.g. selective logging) is recommended. Reductions in cattle stocking densities would help mitigate the effects of rapid runoff and higher silt loads in the runoff.}, doi = {https://dx.doi.org/10.2305/IUCN.UK.2019-3.RLTS.T142673841A145641601.en}, url = {https://www.iucnredlist.org/species/142673841/145641601}, author = {Hendrickson, Dean~A. and Tomelleri, Joseph R.} } @article {hendrickson_oncorhynchus_2019-6, title = {Oncorhynchus sp. nov. {\textquoteright}Piaxtla Trout{\textquoteright}}, journal = {The IUCN Red List of Threatened Species}, volume = {2019}, number = {e.T142674424A145641631}, year = {2019}, note = {Number: e.T142674424A145641631 Reporter: The IUCN Red List of Threatened Species}, month = {dec}, abstract = {TAXONOMIC NOTES The Piaxtla Trout is the closest relative to the San Lorenzo trout, but is phenotypically distinct and Escalante et al. (2015) report genetic differences. JUSTIFICATION This species is restricted to few headwater streams of the R{\'\i}o Piaxtla drainage between 2,100-2,700 m asl in Durango, Mexico. While its extent of occurrence and area of occupancy are both restricted, this species appears to be abundant where it occurs and population status is suspected to be stable. There are no known major pervasive threats. Therefore, this species is assessed as Near Threatened because it meets the threshold for a threatened category under criteria B1 and B2, subpopulations are likely severely restricted, but there is no indication of major population or habitat decline. GEOGRAPHIC RANGE INFORMATION This species is found in a few headwater streams of the R{\'\i}o Piaxtla drainage between 2,100-2,700 m asl. The largest populations appear to be in Arroyo El Granizo, Arroyo Santa Barbara, and Arroyo de la Plazuela. Extent of Occurrence (EOO) for this species is estimated to be 334 km{\texttwosuperior} and area of occupancy (AOO) is unlikely to exceed 10 km. Threats are expected to act independently on stream headwaters, therefore the number is locations is expected to be fewer than 10. Distribution is not considered to be very restricted, given a lack of major plausible threats with the capacity to drive this species towards extinction within a short period of time. There is one instance of intra-basin transfer of Piaxtla Trout to a fishless stream. However, the status of that introduction is unknown. POPULATION INFORMATION This species appears to be locally abundant at the few collection localities where it occurs. Current population trend is suspected to be stable. However, populations are inferred to be severely restricted, given they do not occur in main river reaches and likely encounter thermal barriers that limit the dispersal of individuals between headwater reaches. HABITAT AND ECOLOGY INFORMATION The Piaxtla Trout occupies cold and clear headwater streams. Virtually nothing is known of its reproductive or behavioural traits. THREATS INFORMATION Currently, there are no known major pervasive threats to this species. There are no known grow-out facilities for rainbow trout in the Piaxtla basin. However, future genetic introgression with Rainbow Trout is expected, given government initiatives that promote the development of hatcheries. Sportfishing occurs in the basin but is not thought to present a major threat at this time. USE AND TRADE INFORMATION There is no known trade in the taxon. CONSERVATION ACTIONS INFORMATION There are no known conservation actions in place at this time. Education of the local populace about the native trout is recommended. More research regarding distribution, population size, population status, and the impacts of potential threats would be useful in guiding future conservation action.}, doi = {https://dx.doi.org/10.2305/IUCN.UK.2019-3.RLTS.T142674424A145641631.en}, url = {https://www.iucnredlist.org/species/142674424/145641631}, author = {Hendrickson, Dean~A. and Tomelleri, Joseph R.} } @article {hendrickson_oncorhynchus_2019-4, title = {Oncorhynchus sp. nov. {\textquoteright}Presidio Trout{\textquoteright}}, journal = {The IUCN Red List of Threatened Species}, volume = {2019}, number = {e.T142674431A145641636}, year = {2019}, note = {Number: e.T142674431A145641636 Reporter: The IUCN Red List of Threatened Species}, month = {dec}, abstract = {TAXONOMIC NOTES Hendrickson and Tomelleri (In Press) discussed the provenance of trout in the Presidio basin, and determined that trout were indeed native to the drainage. JUSTIFICATION This species historically occurred in isolated headwater streams of the R{\'\i}o del Presidio. Based on current collection records, this species exhibits a restricted extent of occurrence (EOO) and area of occupancy (AOO). Recent collections show strong introgression in the watershed. More collections need to be made to determine the range and purity of remaining populations. Native trout from Arroyo Hondo (Quebrada de Vega) were historically abundant, but collections from 2004 show that stream to be compromised by Rainbow trout. Therefore, it is uncertain if this species still exists in pure form. As such, it is assessed as Data Deficient (DD) until more information regarding the distribution, populations status, and magnitude of introgression is available. GEOGRAPHIC RANGE INFORMATION Trout occur sporadically throughout the R{\'\i}o del Presidio in isolated headwater streams. It is unknown at this time which populations represent pure Presidio Trout. POPULATION INFORMATION Trout are locally common in isolated populations. However, it is not known which, if any of these populations represent pure Presidio trout populations. Trout were first collected from the Presidio watershed in 1906 by Walter C. Bishop (Needham and Gard, 1959). Later collections were made by Ralph G. Miller in 1946, and by "P.R. Needham and party" in 1952. Subsequent collections in the 2000s are suspected to show strong signs of introgression and lead to doubts as to whether any of these recent collections represent pure native Presidio trout. HABITAT AND ECOLOGY INFORMATION This species occurs in cold and clear headwater arroyos and canyons in the upper R{\'\i}o del Presidio watershed. Elevation ranges from 1800-2700 masl. Basic life history and basic ecology are uncertain and require additional research. THREATS INFORMATION The principal threat of overriding concern is hybridization with rainbow trout. There is uncertainty regarding the extent of introgression in the various subpopulations, but introgression is suspected to be widespread throughout the watershed (Escalante et al. 2014). Future genetic introgression with rainbow trout is expected, given government initiatives that promote the development of hatcheries within the region. USE AND TRADE INFORMATION There is no known trade in the taxon. CONSERVATION ACTIONS INFORMATION There are no species-specific conservation actions in place. The prevalence of hatcheries and grow-out facilities in the Presidio watershed present an obstacle to recovery. To conserve this species, it is necessary to document a pure lineage of Presidio trout and use it as a founder population for subsequent reintroductions. More research regarding taxonomy, distribution, population size, and population status of Presidio trout are needed to guide future conservation action.}, doi = {https://dx.doi.org/10.2305/IUCN.UK.2019-3.RLTS.T142674431A145641636.en}, url = {https://www.iucnredlist.org/species/142674431/145641636}, author = {Hendrickson, Dean~A. and Tomelleri, Joseph R.} } @article {hendrickson_oncorhynchus_2019-3, title = {Oncorhynchus sp. nov. {\textquoteright}San Lorenzo Trout{\textquoteright}}, journal = {The IUCN Red List of Threatened Species}, volume = {2019}, number = {e.T142674185A145641626}, year = {2019}, note = {Number: e.T142674185A145641626 Reporter: The IUCN Red List of Threatened Species}, month = {dec}, abstract = {TAXONOMIC NOTES JUSTIFICATION This species is restricted to cold, high elevation headwater streams in the Remedios sub-basin of the San Lorenzo drainage. Its extent of occurrence (EOO) and area of occupancy (AOO) are both restricted. Continual declines in EOO and AOO are inferred based on the most serious threats, which include widespread introgression with rainbow trout, and declines in the quality, area, and extent of habitat resulting from deforestation and livestock overgrazing. Subpopulations are severely fragmented with limited to no genetic exchange due to thermal barriers outside of headwater habitat. Localized threats are likely to affect stream subpopulations independently and the number of locations where this species occurs is estimated to be six. Therefore, this species is assessed as Endangered (EN) under criterion B1ab(i,ii,iii)+2ab(i,ii,iii). GEOGRAPHIC RANGE INFORMATION Known populations reside within the Remedios sub-basin of the San Lorenzo. R{\'\i}o Truchas would appear to have the most significant population. Arroyo la Sidra has a peculiar morphotype above the waterfall near Vencedores that is genetically unique. The San Gregorio arm of the San Lorenzo is complimentary in size to the Remedios, but is unexplored for trout. Extent of occurrence (EOO) for this species is estimated to be 4,662 km{\texttwosuperior} and area of occupancy (AOO) is estimated to be 18 km{\texttwosuperior}, based on known collection localities. Given the scope of potential threats, the number of locations is estimated to be six. POPULATION INFORMATION Total population size is uncertain, but unlikely to exceed 1,000. Population trend is uncertain but likely to be declining at a rate that precludes listing under a threatened category under criterion A. San Lorenzo trout are common in the R{\'\i}o Truchas. Trout in Arroyo la Sidra above the falls are not common, and are in danger of introgression due to the release of rainbow trout from a nearby grow-out facility. Other disjunct populations occur in small headwater tributaries of the Remedios. Subpopulations are considered severely fragmented, given specific habitat requirements and an inability to migrate across thermal barriers in river mainstreams. HABITAT AND ECOLOGY INFORMATION This species occurs in cold and clear high mountain streams, headwaters and larger arroyos at elevations between 2,300-2,700 m asl. Biological habits, niche, and reproductive characteristics have not been studied for San Lorenzo trout. THREATS INFORMATION Hybridization with rainbow trout is rampant in Arroyo la Sidra below the main falls. Escapes from the grow-out facility are frequent. Hybridization may pose a threat to other populations in the San Lorenzo where populations are not fragmented by thermal barriers. Logging and livestock are present in adjacent areas and may create runoff problems in the watershed. Future genetic introgression with rainbow trout is expected, given government initiatives that promote the development of hatcheries within the region. USE AND TRADE INFORMATION There is no known trade in the taxon. CONSERVATION ACTIONS INFORMATION There are currently no species-specific conservation measures in place. Recommended conservation measures include encouraging ejidos to limit access of livestock to streams, and prevention of future rainbow trout releases to reduce future introgression outside of Arroyo la Sidra. More research regarding distribution, population size, population trend, and the magnitude of potential threats would be useful in guiding future conservation action.}, doi = {https://dx.doi.org/10.2305/IUCN.UK.2019-3.RLTS.T142674185A145641626.en}, url = {https://www.iucnredlist.org/species/142674185/145641626}, author = {Hendrickson, Dean~A. and Tomelleri, Joseph R.} } @article {hendrickson_oncorhynchus_2019-1, title = {Oncorhynchus sp. nov. {\textquoteright}Sinaloa Golden Trout{\textquoteright}}, journal = {The IUCN Red List of Threatened Species}, volume = {2019}, number = {e.T142674143A145641616}, year = {2019}, note = {Number: e.T142674143A145641616 Reporter: The IUCN Red List of Threatened Species}, month = {dec}, abstract = {TAXONOMIC NOTES The Sinaloa trout is phenotypically and meristically distinct from Oncorhynchus chrysogaster specimens in the rios Fuerte and Culiac{\'a}n, and is therefore treated separately from those taxa. JUSTIFICATION This species is restricted to headwater tributaries in the R{\'\i}o Sinaloa basin between 2,600-2,800 m asl, exhibits a restricted extent of occurrence (EOO) and area of occupancy (AOO), and occurs at less than 10 locations. Total population size is unknown but suspected to be relatively small. Population trend is unknown. Subpopulations are inferred to be severely fragmented, given specific habitat requirements for cold, clear water, and an inability to disperse across mainstem river thermal barriers. Localized threats include siltation due to livestock overgrazing, deforestation, and introgression with hatchery raised rainbow trout, which has resulted in a continued decline in the area, extent, and quality of available habitat, and a projected continued decline in EOO and AOO. Therefore, this species is assessed as Endangered (EN) under criterion B1ab(i,ii,iii)+2ab(i,ii,iii). GEOGRAPHIC RANGE INFORMATION This species is restricted to headwater tributaries in the R{\'\i}o Sinaloa basin between 2600-2800 masl. Arroyos El Soldado, Casa Quemada, and El Potrero appear to have the most broadly distributed populations. Extent of occurrence (EOO) for this species is estimated to be 368 km{\texttwosuperior} and area of occupancy (AOO) is estimated to be 18 km{\texttwosuperior}. This species is known from nine localities and major threats are expected to impact each locality separately. Therefore, the number of locations where this species occurs is nine. Both EOO and AOO are projected to undergo continuing decline if threats are not mitigated. Edward William Nelson saw trout in streams on the slopes of Mt. Mohinora in 1898, and we suspect that he was in the Sinaloa drainage at the time. POPULATION INFORMATION Information on population size and trends is limited, as most of these streams have been collected once in the last 50 years. This species is localized to tiny headwater streams, and therefore population size is suspected to be less than 1,000. Observation of degraded habitat and the difficulty of finding viable populations suggests that this species was more widespread in historical times. It is suspected that more intensive collecting would produce more sites at lower altitudes for Sinaloa Trout. Subpopulations are considered severely fragmented, given habitat requirements and the presence of thermal barriers in mainstem rivers that prevent dispersal. HABITAT AND ECOLOGY INFORMATION This species requires cold, clear water in headwater streams, with gravel for spawning. The specific habitat uses, basic life history, and basic ecology of this species are uncertain and require additional research. THREATS INFORMATION Overgrazing by livestock has caused siltation in Sinaloa tributaries and remains an ongoing problem. The watershed is logged, but does not appear to be heavily so. One locality (Arroyo Rancho en Medio) contained hybrids between Sinaloa Trout and hatchery Rainbow Trout. The hybrids were localized near a grow-out facility that contained hatchery trout. A waterfall prevented the movement of rainbow trout upstream, but no such barriers exist to downstream dispersion. Future genetic introgression with Rainbow Trout is expected, given government initiatives that promote the development of hatcheries within the region. USE AND TRADE INFORMATION There is no trade in the taxon. CONSERVATION ACTIONS INFORMATION There are currently no species-specific conservation measures in place. Education of the local population to prevent livestock from degrading riparian areas, and encouraging the production of native trout in grow-out facilities to eliminate hybridization with rainbow trout are priority conservation actions. More research regarding distribution, population size, population trend, and the impacts of localized threats would be useful in guiding future conservation action.}, doi = {https://dx.doi.org/10.2305/IUCN.UK.2019-3.RLTS.T142674143A145641616.en}, url = {https://www.iucnredlist.org/species/142674143/145641616}, author = {Hendrickson, Dean~A. and Tomelleri, Joseph R.} } @article {hendrickson_oncorhynchus_2019, title = {Oncorhynchus sp. nov. {\textquoteright}Southern Conchos Trout{\textquoteright}}, journal = {The IUCN Red List of Threatened Species}, volume = {2019}, number = {e.T145641073A145641656}, year = {2019}, note = {Number: e.T145641073A145641656 Reporter: The IUCN Red List of Threatened Species}, month = {dec}, abstract = {TAXONOMIC NOTES Undescribed species. Affinity appears to be with Mexican golden trout in the adjacent Fuerte basin, but genetic work shows this trout to be unique. Nathaniel Thomas Lupton collected two specimens of trout from this region in 1884 (Cope, 1886), but the location of the specimens and the collection locality remain a mystery. JUSTIFICATION This species is known only from about 2 km of the Arroyo del Molino and a tiny headwater tributary in the R{\'\i}o Porvenir sub-basin of the southern R{\'\i}o Conchos watershed. While there are currently no major threats affecting this species or its known habitat, total population size is unlikely to exceed 250 individuals. Therefore, it is assessed as Endangered (EN) under criterion D. More rigorous sampling in adjacent areas is needed to determine if additional populations exist. GEOGRAPHIC RANGE INFORMATION This species is currently known only from about 2 km of the Arroyo del Molino and a tiny headwater tributary in the R{\'\i}o Porvenir sub-basin of the southern R{\'\i}o Conchos watershed, which occurs at an elevation between 2,300-2,350 m asl. Therefore, extent of occurrence (EOO) and area of occupancy (AOO) are both estimated at 2 km{\texttwosuperior}. Localized threats are expected to affect the entire known range of this species. Area of Occupancy and EOO are currently stable, given the single location is highly isolated and free of major threats. POPULATION INFORMATION Total population size is unknown. However, given a highly restricted range, habitat specificity for cold headwater streams, and preliminary population surveys in 2007, population size is inferred to be between 100-250, and unlikely to exceed 1,000. Population trend is suspected to be stable, given the lack of major pervasive threats, and no evidence of habitat decline. The current known population is not considered to be severely fragmented. However, if additional subpopulations exist, genetic exchange between subpopulations is likely severely restricted given an inability to disperse through thermal barriers in river mainstems. HABITAT AND ECOLOGY INFORMATION This species is restricted to one headwater stream of the R{\'\i}o Porvenir sub-basin in the Conchos watershed. Cold and clear water is required. Nothing is known of the behavior, life cycle, or growth patterns of this species. THREATS INFORMATION There appear to be no immediate threats to the existing population, as it is remote and not easily accessible. Limitations to range expansion include overgrazing by livestock and the effects of logging and road building in this sub-basin. Future genetic introgression with rainbow trout is expected, given government initiatives that promote the development of hatcheries within the region. USE AND TRADE INFORMATION There is no known trade in this taxon. CONSERVATION ACTIONS INFORMATION There are no species-specific conservation actions in place. Recommended conservation actions include education of the local peoples regarding conservation status and efforts to keep livestock out of the lower reaches of the arroyo. There appears to be minimal impact in the species{\textquoteright} actual habitat. More rigorous sampling to identify additional subpopulations of the species is recommended, given the area is remote and difficult to survey. Additionally, more detailed information regarding population size, population trend, and life history and ecology would be useful in guiding future conservation action.}, doi = {https://dx.doi.org/10.2305/IUCN.UK.2019-3.RLTS.T145641073A145641656.en}, url = {https://www.iucnredlist.org/species/145640871/145641651}, author = {Hendrickson, Dean~A. and Tomelleri, Joseph R.} } @book {hendrickson_first_2019, title = {The First Fifty Years of Desert Fishes Council: Compiled Proceedings and Abstracts (1969 {\textendash} 2018)}, series = {Special Publication of the Desert Fishes Council}, volume = {1}, year = {2019}, month = {dec}, publisher = {Desert Fishes Council}, organization = {Desert Fishes Council}, address = {Bishop, California, U.S.A.}, abstract = {The Desert Fishes Council (DFC) is a non-profit (registered with the U.S. Internal Revenue Service in 1988) professional organization founded in 1969 with the mission of preserving "the biological integrity of desert aquatic ecosystems and their associated life forms, to hold symposia to report related research and management endeavors, and to effect rapid dissemination of information concerning activities of the Council and its members" (http://desertfishes.org). Fulfillment of that mission from the start included the production of a comprehensive report on all meeting activities (business meeting + abstracts of presented papers and posters) that was disseminated to the membership as the "Proceedings of the Desert Fishes Council". After 20 years of production and editing by Phil Pister, in 1990, Dean Hendrickson assumed editorship, producing the 1990-1994 volumes. Starting with the 1992 content, the editorial workflow changed from paper originals to all content being digital from abstract submission through published digital annual volumes available from the DFC website, and the Proceedings were formally registered as a serial publication (ISSN 1068-0381). Gary Garrett served as editor for the 1995-1996 volumes, and Hendrickson and Garret co-edited the 1997-1998 volumes. Hendrickson and Lloyd Findley served as co-editors for 1999-2007, adding Spanish translations of all abstracts. Following a decision by the Executive Committee to cease translation after the 2007 volume, Hendrickson continued as sole editor from 2008 through 2019. From the beginning, bound hard copies of the Proceedings were mailed to DFC members and a variable number of selected, mostly academic libraries, but around 2000, distribution switched exclusively to email and downloading from the internet. Eventually, all pre-1992 Proceedings issues were scanned to PDFs which were made available from the website, but, with conversion of the workflow to abstract submission direct to an online database in 2008, the classical content of the Proceedings became fragmented, with minutes of the meetings published each year on the website and a separate online abstracts database. Thus, even as the 50th anniversary of the DFC approached, the historical content of its Proceedings, though all available in digital format, remained scattered across many different files and formats, making comprehensive searching of the complete content laborious. At the time of finalizing this abstract (October 2019) and final compilation of this volume, post-2007 abstracts of papers presented at the meetings were searchable from the website via the online abstract database, and the 1992-2007 PDFs of the annual Proceedings (all originally digital content) were separately searchable by downloading (from the DFC website) the annual files into PDF reader programs. The 1969-1991 volumes were also each searchable in the same way, but their textual (searchable) content, the product of automated Optical Character Recognition (OCR) done when that technology was still young, had many errors. Some business meeting minutes since 2007 were available via the DFC website, but were difficult to find there, and many were missing. Here, we provide the first single, text-based PDF file that brings the entire history of the DFC together in one place. All 2008-2018 business meeting minutes have been found and added to this file. The newer OCR technology used in this file produced much better results with the older, graphic-based content than what is found in the separate PDFs on the DFC website, and this single compilation file will now allow easy text-based querying across the complete history of DFC to present, greatly improving the utility of the archive for historical and scientific research. We are happy to now provide this permanently archived, and openly available file as a one-stop resource for access to the large corpus of historical and scientifically important conservation-related research built by the four editors who compiled this archive, and by all of the members of the DFC who contributed content over the first half century of DFC{\textquoteright}s history. As we now turn management of DFC{\textquoteright}s future content over to future Proceedings Editors, we suggest that they initiate work (perhaps Citizen Science-based?) to correct the remaining OCR and other errors (though less prevalent than in the early volumes), and ideally eventually more fully parse, and continue mining of, the contents to serve it via a digital, online database in compliance with standard bibliographic, taxonomic, and geo-spatial data standards, comparable to the way other modern scientifically useful content is served and linked across the Internet. Ideally, authors{\textquoteright} presentations could also be linked-in from permanent archives (such as DFC{\textquoteright}s F1000 channel).}, isbn = {ISSN 1068-0381}, url = {https://doi.org/10.15781/T2QB9VR0N}, editor = {Hendrickson, Dean A. and Pister, Edwin P. and Findley, Lloyd T. and Garrett, Gary P.} } @inbook {hendrickson_mexican_2019, title = {Mexican Trout: Treasures of the Sierra Madre}, booktitle = {Trout and Char of the World}, year = {2019}, note = {http://dx.doi.org/10.26153/tsw/8755}, month = {sep}, publisher = {American Fisheries Society}, organization = {American Fisheries Society}, address = {Bethesda, Maryland, USA}, abstract = {American theatergoers are familiar with director John Huston{\textquoteright}s classic movie of 1948, The Treasure of the Sierra Madre, based on a novel written by B. Traven and starring Humphrey Bogart as Fred C. Dobbs. At least north of the border, Traven{\textquoteright}s tale of loco gringos prospecting for gold made Mexico{\textquoteright}s rugged mountains famous, and many cinephiles still recognize the famous quote by Gold Hat the bandito: {\textquotedblleft}Badges! We ain{\textquoteright}t got no badges. We don{\textquoteright}t need no badges! I don{\textquoteright}t have to show you any stinking badges.{\textquotedblright} Huston filmed most of his mountain scenes on location in Mexico, and some 50 years later, we found ourselves in the Sierra Madre Occidental (henceforth, SMO) of northwest Mexico with our own saga of prospecting for {\textquotedblleft}gold{\textquotedblright} beginning to unfold. Always without badges but often stinking after days of back-country camping and hiking, our binational and otherwise diverse cast of academic, government, and nonprofit biologists and fly fishers came to call itself Truchas Mexicanas (Mexican trout), after the different, but also gilded, treasure we were chasing.}, isbn = {978-1-934874-54-7}, url = {https://hdl.handle.net/2152/81747}, author = {Hendrickson, Dean~A. and Tomelleri, Joseph R.}, editor = {Kershner, Jeffrey L. and Williams, Jack E. and Gresswell, Robert E. and Lob{\'o}n-Cervi{\'a}, Javier} } @article {hendrickson_undescribed_2019, title = {Undescribed Mexican trout diversity: an update and conservation status assessments}, journal = {F1000Research}, volume = {8}, year = {2019}, month = {nov}, abstract = {Two Mexican trout taxa are formally described (Oncorhynchus chrysogaster, and O. mykiss nelsoni), but many other congeners have long been informally recognized as likely distinct. For more than two decades, the binational Truchas Mexicanas team searched for and collected trout broadly throughout the Sierra Madre Occidental of Sonora, Chihuahua, Sinaloa and Durango. That fieldwork documented that the native range of the genus extends to the Tropic of Cancer, or \textasciitilde1000 km S of El Paso, Texas, and indicates that most of Mexico{\textquoteright}s trout exist as small, isolated populations with very restricted ranges. Genetic studies of Truchas Mexicana{\textquoteright}s specimens demonstrated that the many distinctive lineages found in Mexico are at least as divergent from one another as are their much more thoroughly-studied relatives in the O. mykiss complex in the Western U.S.A. When an opportunity presented itself to list the many still undescribed Mexican forms in the IUCN Red List, as part of a large project to assess the conservation status of the entire Mexican freshwater fish fauna, the authors rapidly compiled the necessary documentation and submitted the required proposal. Once the proposal was accepted, we then worked with IUCN staff to finalize formal conservation assessments that should be published in the Red List about 1 month after this presentation is given at the 2019 meeting. We hope that this official listing of these 12 mostly undescribed Mexican endemic species, with 3 determined to be Critically Endangered (CR), 5 Endangered (EN), 3 Near Threatened (NT), and one Data Deficient (DD), will call attention to this important biodiversity asset and open doors for much-needed financial support for the conservation actions that are so desperately needed. Meanwhile, work continues on the morphologically difficult diagnoses of the new species and their descriptions.}, doi = {10.7490/f1000research.1117703.1}, url = {https://f1000research.com/slides/8-1990}, author = {Hendrickson, Dean A. and Lyons, Timothy and Tomelleri, Joseph} } @booklet {hendrickson_natural_2019, title = {Natural history specimens collected and/or identified and deposited.}, year = {2019}, note = {type: dataset}, month = {sep}, publisher = {Zenodo}, abstract = {Natural history specimen data collected and/or identified by Hendrickson, Dean A., https://orcid.org/0000-0001-7835-0295. Claims were made on Bloodhound, https://bloodhound-tracker.net using specimen data from the Global Biodiversity Information Facility, https://gbif.org. This is a continual growing compilation as new specimens are cataloged, published by the repositories in which they are held, and attributed to the author via Bloodhound.}, keywords = {natural history, specimen, taxonomy}, doi = {10.5281/zenodo.3445527}, url = {https://zenodo.org/record/3445527$\#$.XansTUZKhO8}, author = {Hendrickson, Dean A.} } @inbook {birdsong_texas_2019, title = {Texas Native Fish Conservation Areas Network: Strategic investments in restoration and preservation of freshwater fish diversity}, booktitle = {Multispecies and Watershed Approaches to Freshwater Fish Conservation}, series = {AFS Symposium}, number = {91}, year = {2019}, publisher = {American Fisheries Society}, organization = {American Fisheries Society}, address = {Bethesda, Maryland}, abstract = {Texas harbors 190 species of native freshwater fishes, 47\% of which are considered imperiled. The primary cause of fish species imperilment in Texas is anthropogenic alteration of freshwater systems, which continues to occur at rates and scales that threaten the long-term resiliency of freshwater habitats, species, and ecosystems. Innovative conservation approaches are needed to restore and maintain functional watershed processes, restore freshwater habitats, and conserve native species, while simultaneously supporting human needs, such as flood control, municipal and agricultural water supply, water quality protection, and water-based recreation. The need for an integrated and holistic approach to conservation of freshwater systems has been the impetus for development of the Texas Native Fish Conservation Areas Network (Network). The Network consists of springs, ci{\'e}negas, creeks, rivers, and associated watersheds uniquely valued in preservation of Texas freshwater fish diversity. Twenty Native Fish Conservation Areas have been designated throughout the state. These were selected based on a spatial prioritization focused on identification of freshwater systems critically important to the long-term persistence of 90 freshwater fishes considered species of greatest conservation need. Through a shared vision of collaborative stewardship, conservation partnerships have formed among non-governmental organizations, universities, and state and federal agencies to plan and deliver actions within the Network to restore and preserve native fishes and their habitats. Furthermore, the Network has increased awareness of the ecological, recreational, and economic values of Texas freshwater systems, and helped increase interest and capacity of local landowners, communities, and recreational users (e.g., paddlers, anglers) to act as advocates and local stewards of these systems. By facilitating partnership development, coordinating broad-based conservation planning, and leveraging technical and financial resources toward strategic conservation investments, the Network has served as a catalyst for collaborative, science-based stewardship of native freshwater fishes and their habitats in Texas. The Network offers a successful case study in multispecies and watershed approaches to freshwater fish conservation transferrable to other states in the USA, with particular relevance to those states that, similar to Texas, consist predominately of privately-owned landscapes.}, keywords = {Native Fish Conservation Areas}, isbn = {978-1-934874-57-8}, url = {https://fisheries.org/bookstore/all-titles/afs-symposia/54091c/}, author = {Birdsong, Timothy W. and Garrett, Gary P. and Labay, Benjamin J. and Bean, Megan G. and Bean, Preston T. and Botros, John and Casarez, Melissa J. and Cohen, Adam E. and Heger, Thomas G. and Kalmbach, Arlene and Hendrickson, Dean A. and Magnelia, Stephan and Mayes, Kevin B. and McGarrity, Monica and McGillicuddy, Ryan and Parker, M. Melissa and Robertson, Sarah}, editor = {Dauwalter, Daniel C. and Birdsong, Timothy W. and Garrett, Gary P.} } @inbook {labay_whos_2019, title = {Who{\textquoteright}s Asking?: Inter-Jurisdictional Conservation Assessment and Planning for Great Plains Fishes}, booktitle = {Multispecies and Watershed Approaches to Freshwater Fish Conservation}, series = {AFS Symposium}, number = {91}, year = {2019}, pages = {57{\textendash}83}, publisher = {American Fisheries Socienty}, organization = {American Fisheries Socienty}, address = {Bethesda, Maryland, USA}, abstract = {Aquatic biodiversity is threatened by human activities on a global scale. Mobile organisms such as stream fishes in particular are threatened by anthropogenic processes operating across jurisdictional and conservation area boundaries. Strategic conservation planning for broad, multi-{\textlnot}species and multi{\textlnot}jurisdictional landscapes benefits from datadriven approaches emphasizing persistence of priority species while accounting for human uses and stakeholder priorities. This study presents such an assessment for conservation of priority fishes of the Great Plains of the United States. Distribution models for 28 priority fishes were incorporated into a prioritization framework using the open-source software Zonation. A series of assessments were produced, including i) identification of distinct conservation areas based on connectivity and compositional similarity of priority streams, ii) perspectives for fish habitat condition prioritized towards undisturbed habitat (indicating protection potential) and disturbed habitat (indicating restoration potential), iii) ranking species conservation values at local (state) and global scales, and iv) development of {\textquoteright}bang-{\textlnot}for-{\textlnot}buck{\textquoteright} perspectives emphasizing richness of species at state, basin, and study region scales. Assessment highlights include prioritizations primarily among unfragmented mainstem reaches, considerable state-boundary-based edge effects for rankings when using state-based conservation values, and identification of eight distinct regions containing natural communities of priority taxa. Further, we integrate an assessment product into a tiered framework for conservation implementation that facilitates coordination among stakeholders across jurisdictions and increases efficiency of conservation efforts. This set of analyses thus provides varying perspectives to direct diverse stakeholders in effective allocation of resources.}, keywords = {Fishes of Texas}, isbn = {978-1-934874-57-8}, author = {Labay, Benjamin J. and Perkin, Joshuah S. and Hendrickson, Dean A. and Cooper, Arthur Raymond and Garrett, Gary P. and Birdsong, T.W.}, editor = {Dauwalter, Daniel C. and Birdsong, Timothy W. and Garrett, Gary P.} } @article {hendrickson_iucn_2019, title = {IUCN Red List of Threatened Species: Etheostoma segrex}, journal = {IUCN Red List of Threatened Species}, number = {e.T193259A126256811}, year = {2019}, note = {http://web.archive.org/web/20200819221004/https://www.iucnredlist.org/en; http://web.archive.org/web/20200819221009/https://www.iucnredlist.org/en}, abstract = {TAXONOMIC NOTES JUSTIFICATION Etheostoma segrex is a freshwater fish endemic to the headwaters of the Rio Salados de los Nadadores. While the historical distribution of this species may have included much of the headwaters of the Rio Salados de los Nadadores, extensive groundwater extraction, surface water diversion, and introduced Arundo populations have degraded much of the historical habitat, and it now only occurs in a few, localized areas within the Canyon below Cuatro Cienegas. Given the restricted distribution of this species and the plausible threat of extirpation due to habitat degradation resulting from continued groundwater extraction and surface water diversion, the entire population of E. segrex is considered as one location. Given a highly restricted extent of occurrence and area of occupancy, 1-5 locations, and inferred continuing decline in extent of occurrence, area of occupancy, and area, extent and/or quality of habitat, E. segrex is assessed as Critically Endangered. GEOGRAPHIC RANGE INFORMATION Etheostoma segrex is an endemic species from the headwaters of the Rio Salado de los Nadadores (Miller et al. 2005) which originates in the Sierra Madre Oriental and flows northeastward in central Coahuila, Mexico. Rio Salado is a tributary of Rio Bravo de Norte part of the Rio Grande system and crosses the Chihuahuan Desert of northern Mexico (Norris and Minckley 1997). POPULATION INFORMATION It is highly likely that populations of E. segrex have declined in recent years as a result of habitat loss due to water diversion and extraction, which has reduced the flow of the Rio Salado de los Nadadores by as much as 90\% (Norris and Minckley 2002). In addition, introduced species may be impacting habitat quality in the area. Total population size is unknown. However, E. segrex has been relatively abundant in the few localities that still support populations (Norris and Minckley 1997, Norris and Minkley 2002). HABITAT AND ECOLOGY INFORMATION Etheostoma segrex is known to occur within freshwater rivers and streams, inhabiting riffles approximately 1.5-3 m wide and from 10 to 25 cm deep, of moderate turbulence over gravel and small cobble substrate (Norris and Minckley 1997). This species most likely feeds on small invertebrates and can be found mainly in vegetated, shallower areas, avoiding deeper, soft-bottomed eddies, pools or runs and turbulent {\textquoteleft}whitewater{\textquoteright} rapids (Norris and Minckley 1997). THREATS INFORMATION Both surface streams and underground waters in the Chihuahuan region are under increasingly heavy exploitation. Depletion of water resources is accelerating due to development for domestic, agricultural, and industrial uses. Etheostoma segrex is threatened by human water diversion and extraction through canals and wells, causing habitat alteration and degradation in water resources such as the Rio Salado de los Nadadores and its ground-water sources, which are under heavy demand in the very arid region of the eastern Chihuahuan desert (Norris and Minckley 1997). Significant darter habitat has already been severely degraded or lost and will not recover due to introduced Arundo populations. Recently, a number of wetlands and rivers in Cuatro Ci{\'e}negas, have also become infested with the invasive weed, Arundo donax, which may exacerbate water shortages (McGaugh et al. 2007). The most recent estimates of groundwater extraction around Cuatro Cienegas suggest that 55.4 million m3 are pumped annually from 101 well points, 93\% of which are used in alfalfa cultivation to feed livestock (CONAGUA 2015). Large portions of habitat have recently been lost (e.g., Laguna Grande) resulting from declines in the water table (Felstead et al. 2015). Because the Comision Nacional del Agua does not have authority to restrict the future construction of wells, extraction is expected to continue into the immediate future (CONAGUA 2015). USE AND TRADE INFORMATION There is no information regarding the use or trade of E. segrex. CONSERVATION ACTIONS INFORMATION All aquatic systems of the Cuatro Cienegas basin have been designated as a Biosphere Reserve which may prevent further habitat degradation (Norris and Minckley 2002, IUCN and UEP 2018). However, the effects of this conservation action are unknown as the habitat of E. segrex does not extend into the protected areas. The American Fisheries Societies third compilation of imperiled freshwater and diadromous fishes of North America includes E. segrex as endangered under criteria 1 (present or threatened destruction, modification, or reduction of a taxon{\textquoteright}s habitat or range) and 5 (a narrowly restricted range) (Jelks et al. 2008). However, these designations confer no protective benefit.}, doi = {https://dx.doi.org/10.2305/IUCN.UK.2019-2.RLTS.T193259A126256811.en}, url = {https://www.iucnredlist.org/en}, author = {Hendrickson, Dean~A. and Lyons, Timothy} } @booklet {garrett_history_2018, title = {A History of Cooperative Conservation in West Texas Watersheds}, number = {PWD LF W7000-1405 (7/19)}, year = {2018}, publisher = {Texas Parks and Wildlife Department}, address = {Austin, Texas, U.S.A.}, author = {Garrett, Gary P.} } @article {gonzales_iucn_2018, title = {IUCN Red List of Threatened Species: Cyprinodon atrorus}, journal = {IUCN Red List of Threatened Species}, number = {e.T6145A3104781}, year = {2018}, month = {sep}, abstract = {Established in 1964, the IUCN Red List of Threatened Species has evolved to become the world{\textquoteright}s most comprehensive information source on the global conservation status of animal, fungi and plant species.}, doi = {10/gjfzmr}, url = {https://www.iucnredlist.org/en}, author = {Gonzales, Arcadio Valdes and Hendrickson, Dean A.} } @article {hendrickson_compiled_2018, title = {Compiled Proceedings of the Desert Fishes Council}, volume = {1}, number = {1969-2017}, year = {2018}, month = {oct}, pages = {4057}, abstract = {The Desert Fishes Council (DFC) is a non-profit (registered with the U.S. Internal Revenue Service in 1988) professional organization founded in 1969 with the mission of preserving "the biological integrity of desert aquatic ecosystems and their associated life forms, to hold symposia to report related research and management endeavors, and to effect rapid dissemination of information concerning activities of the Council and its members" (http://desertfishes.org). Fulfillment of that mission from the start included the production of a comprehensive report on all meeting activities (business meeting + abstracts of presented papers and posters) that was disseminated to the membership as the "Proceedings of the Desert Fishes Council". After 20 years of production and editing by Phil Pister, in 1990, Dean Hendrickson assumed editorship, producing the 1990-1994 volumes. Starting with the 1992 content, the editorial workflow changed from paper originals to all content being digital from abstract submission through published digital annual volumes available from the DFC website, and the Proceedings were formally registered as a serial publication (ISSN 1068-0381). Gary Garrett served as editor for the 1995-1996 volumes, and Hendrickson and Garret co-edited the 1997-1998 volumes. Hendrickson and Lloyd Findley served as co-editors for 1999-2007, adding Spanish translations of all abstracts. Following a decision by the Executive Committee to cease translation after the 2007 volume, Hendrickson continued as sole editor from 2008 to present. From the beginning, bound hard copies of the Proceedings were mailed to DFC members and a variable number of selected, mostly academic libraries, but around 2000, distribution switched exclusively to email and downloading from the internet. Eventually, all pre-1992 Proceedings issues were scanned to PDFs which were made available from the website, but, with conversion of the workflow to abstract submission direct to an online database in 2008, the classical content of the Proceedings became fragmented, with minutes of the meetings published each year on the website and a separate online abstracts database. Thus, even as the 50th anniversary of the DFC approached, the historical content of its Proceedings, though all available in digital format, remained scattered across many different files and formats, making comprehensive searching of the complete content laborious. At the time of finalizing this abstract (October 2018) and the compiled file here described, post-2007 abstracts of papers presented at the meetings were searchable from the website via the online abstract database, and the 1992-2007 PDFs of the annual Proceedings (all originally digital content) were separately searchable by downloading the annual files into PDF reader programs. The 1969-1991 volumes were also each searchable in the same way, but their textual (searchable) content, the product of automated Optical Character Recognition (OCR) done when that technology was still young, had many errors. Here, we provide the first single, text-based PDF file that brings the entire history of the DFC together in one place. The newer OCR technology used in this file produced much better results with the older content than what is found in the separate PDFs on the DFC website, and single searches of this file now extend across the complete history of DFC to present, greatly improving the utility of the archive for historical and scientific research. It is hoped that as more new content is appended, updates of this file will be produced, that remaining OCR errors (though less prevalent than in the early volumes) can eventually be corrected, and that the post-2007 meeting minutes lacking in this file can also be added, making this now permanently archived and openly available file a one-stop resource for the large corpus of historical and scientific conservation-related research built by the 4 editors authoring this archive, and by all of the members of the DFC who contributed content over the first half century of DFC{\textquoteright}s history.}, doi = {10.15781/T2QB9VR0N}, url = {https://repositories.lib.utexas.edu/handle/2152/68639}, author = {Hendrickson, Dean A. and Pister, Edwin P. and Findley, Lloyd T. and Garrett, Gary P.} } @booklet {birdsong_native_2018, title = {Native Fish Conservation Areas of the Southwestern USA: Facilitating Landscape-Scale Conservation of Aquatic Habitats and Freshwater Fishes.}, year = {2018}, month = {sep}, pages = {147}, publisher = {Wildlife Management Institute}, type = {Final}, abstract = {Native Fish Conservation Areas of the southwestern USA consist of springs, ci{\'e}negas, creeks, rivers, and associated watersheds uniquely valued in preservation of freshwater fish diversity. These freshwater systems were identified through a spatial prioritization approach that identifies areas critically important to the long-term persistence of focal fish species. Through a shared mission of collaborative stewardship, conservation partnerships have formed among non-governmental organizations, universities, and state and federal agencies to plan and deliver actions to restore and preserve native freshwater fishes and aquatic habitats within the Native Fish Conservation Areas. Furthermore, the Native Fish Conservation Areas have increased awareness of the ecological, recreational, and economic values of freshwater systems in the region, and helped increase interest and capacity of local landowners, communities, and recreational users (e.g., paddlers, anglers) to act as advocates and local stewards of these systems. By facilitating partnership development, coordinating multi-species, watershed-based conservation planning, and leveraging technical and financial resources toward strategic conservation investments, Native Fish Conservation Areas have served as a catalyst for collaborative, science-based stewardship of native freshwater fishes and aquatic habitats in the southwestern USA. Efforts described herein to prioritize and deliver a network of Native Fish Conservation Areas in the southwestern USA offer a successful case study in multi-species and watershed approaches to freshwater fish conservation transferrable to other states and regions of the USA. This report offers a synthesis of recent (2011-2018) multi-species aquatic assessments, Native Fish Conservation Area prioritizations, conservation planning, and conservation delivery within the southwestern USA explicitly focused on implementation of the Native Fish Conservation Areas approach.}, keywords = {NFCAs}, url = {https://www.researchgate.net/publication/327742874_Native_Fish_Conservation_Areas_of_the_Southwestern_USA_Facilitating_Landscape-Scale_Conservation_of_Aquatic_Habitats_and_Freshwater_Fishes}, author = {Birdsong, Timothy and Dauwalter, Daniel and Garrett, Gary and Labay, Ben J. and Bean, Megan and Broska, James and Graham, Jessica and Magnelia, Stephan and Mayes, Kevin B. and McGarrity, Monica and Johnson, Kevin M. and Robertson, Sarah and Thompson, Therese and Vail-Muse, Stephanie and Whittier, Joanna} } @booklet {hendrickson_aridland_2018, title = {Aridland Ci{\'e}negas of Western North America - Google Fusion Tables}, year = {2018}, publisher = {Google Fusion Tables}, abstract = {This database has roots in 4 previous compilations on ci{\'e}negas: 1) Hendrickson, Dean A., and W.L. Minckley. 1985. {\textquotedblleft}Ci{\'e}negas - Vanishing Climax Communities of the American Southwest.{\textquotedblright} Desert Plants 6 (3): 131{\textendash}75; 2) Minckley, T.A., D.S. Turner, and S.R. Weinstein. 2013. {\textquotedblleft}The Relevance of Wetland Conservation in Arid Regions: A Re-Examination of Vanishing Communities in the American Southwest.{\textquotedblright} Journal of Arid Environments 88: 213{\textendash}21. doi:http://dx.doi.org/10.1016/j.jaridenv.2012.09.001; 3) Minckley, Thomas A., Andrea Brunelle, and Dale Turner. 2013. {\textquotedblleft}Paleoenvironmental Framework for Understanding the Development, Stability, and State-Changes of Ci{\'e}negas in the American Deserts.{\textquotedblright} In RMRS-P-67: Merging Science and Management in a Rapidly Changing World: Biodiversity and Management of the Madrean Archipelago III and 7th Conference on Research and Resource Management in the Southwestern Deserts; 2012 May 1-5; Tucson, AZ, edited by Gerald J. Gottfried, Ffolliott, Brooke S. Gebow, Lane G. Eskew, and Loa C. Collins, RMS-P-67:77{\textendash}83. Rocky Mountain Research Station Proceedings. Fort Collins, Colorado: : U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. http://www.fs.fed.us/rm/pubs/rmrs\_p067.html; 4) Cole, A.T., and Cinda Cole. 2015. {\textquotedblleft}An Overview of Aridland Ci{\'e}nagas, with Proposals for Their Classification, Restoration, and Preservation.{\textquotedblright} In, Kathy Whiteman and William Norris (editors). Proceedings of the Fourth Natural History of the Gila Symposium, October 25{\textendash}27, 2012. Western New Mexico University, Silver City, New Mexico. New Mexico Botanist Special Issue 4:28{\textendash}56. http://gilasymposium.org/ and http://hdl.handle.net/2152/30285 (A static copy of the data from this paper is permanently archived, together with a copy of the complete paper, at http://hdl.handle.net/2152/30285, and the same static copy of the data are available in interactive (fusion table) format at https://www.google.com/fusiontables/DataSource?docid=1C6hbgWSgIPozfzO\_iFnefTERxp5rYoUAuT78XmYs). Now, this second fusion table-served database by Dean A. Hendrickson and Thomas A. Minckley implements the wishes of the Coles and Hendrickson as they began their collaboration. Here we combined the data from Cole and Cole (2015) and the data from Minckley et al 2013, as well as other data from our own knowledge bases and resources, and provide that content freely to the world (within constraints of the license on this fusion table) in this easily explored format. We are also implementing mechanisms to incorporate input of others to provide a dynamic, community-based, growing and constantly improving resource for the study and conservation of ci{\'e}negas. We hope that this database can now start to evolve and improve via contributions from a broader community of interested individuals. Since the initial compilation of Cole and Cole 2015 + Minckley at al 2013 (totaling 353 records), we have continued to sporadically add records as more information is provided to us (on Sept 13, 2018, record 366 was added). We hope to eventually add user-contributed photos and other improvements. In addition to data on occurrences and condition of ci{\'e}negas, we also have a shared, intermittently updated library of bibliographic metadata with links to publications (https://www.zotero.org/groups/north\_american\_cienegas). We invite users to contribute their bibliographic data, photos and pdfs to this collection, and to help us keep it, and this database, updated.}, url = {https://fusiontables.google.com/DataSource?docid=1n9Z5nJ7BXY0TLBbGjFYzFcRooMWCWK_AQDQVAV24$\#$rows:id=1}, author = {Hendrickson, Dean A. and Minckley, Thomas A.} } @article {cohen_conserving_2018, title = {Conserving Texas Biodiversity: Status, Trends, and Conservation Planning for Fishes of Greatest Conservation Need}, journal = {Texas Parks and Wildlife Department - U.S. Fish and Wildlife Service State Wildlife Grant Program}, volume = {contract TX T-106-1 (CFDA\# 15.634))}, number = {459125 UTA14-001402}, year = {2018}, pages = {355}, abstract = {The primary aim of this grant was to work with Texas Parks and Wildlife (TPWD), Texas Advanced Computing Center (University of Texas at Austin), and other collaborators to (1) utilize Fishes of Texas Project (FoTX) data to aid in conservation of Texas fishes, (2) conduct field surveys in under-sampled areas of conservation interest, and (3) further develop the FoTX database and website as a research and management tool. While much of our work focused on Species of Greatest Conservation Need (SGCN), almost everything we did was applied to all species, or affected data for all species. This report documents how FoTX{\textquoteright}s specimen-based data were used to produce species distribution models that, in turn, fed into prioritization analyses that led to official creation of Native Fish Conservation Areas (NFCAs) that are now becoming the foundation of aquatic resource conservation prioritization and management in Texas. Our data were also used by TPWD staff to update the Texas Natural Diversity Database, previously depauperate for fish data, and to develop state and global conservation rankings for fishes using NatureServe{\textquoteright}s standard methodology. Using FoTX data, we also developed recommendations for updating TPWD{\textquoteright}s SGCN list, which will inform conservation in Texas for many years. We also expanded the scope of FoTX beyond Texas, throughout entire drainages, thus reducing biases and analytical complications related to our previous political boundary that lacked a biogeographical basis. We also added many new records from new types of data sources, especially agency databases that complement the museum specimen data to provide a more thorough, updated and unbiased dataset for analyzing temporal and spatial trends in fish faunas. The FoTX website{\textquoteright}s checklists were improved in many ways to increase their utility to resource managers, and the site also now accesses occurrence data held in formerly inaccessible, but now digitized and easily accessed documents. We used diverse resources and our occurrence data to determine native ranges for all Texas fishes, and now visualize them in our website{\textquoteright}s maps, so when viewed alongside occurrence data, users can more easily recognize and explore spatial and temporal trends. We focused another effort at understanding range changes through time, and produced dynamic graphs, that when fully implemented will update automatically as underlying data evolve, depicting and statistically describing locational and general range size changes through time. In addition to database and website work, we were also in the field alongside, and in close coordination with, TPWD staff, focusing on collecting areas previously lacking data, or where there were other conservation-related reasons for sampling. The resultant thousands of new specimens and tissue samples deposited and permanently housed in the University of Texas Biodiversity Collections now provide new, modern data points for ongoing conservation actions. In summary, this project allowed FoTX to continue to grow and diversify, moving away from focusing solely on archiving and improving the data to applying those data in diverse ways that maximize their value for conservation. The project also greatly increased collaborations between FoTX and TPWD staff, and inspired a Herps of Texas Project templated on the FoTX database schema and website, thus providing an efficient pathway for getting that project to a similar state, with the added advantage of a high level of inter-compatibility of most improvements across both sites. Our hope is that other projects, focusing on other taxa, continue to follow in our footsteps, allowing mutual benefit, and eventually query interfaces that provide users access to high quality data for entire ecological communities.}, keywords = {conservation, ENDANGERED species, fishes, Gap Analysis, Native Fish Conservation Areas, Native Range, Species of Greatest Conservation Need, Texas, Trend Analysis}, doi = {10.15781/T26M33M7Z}, url = {https://repositories.lib.utexas.edu/handle/2152/65103}, author = {Cohen, Adam E. and Garrett, Gary P. and Casarez, Melissa J. and Hendrickson, Dean A. and Labay, Benjamin J. and Urban, Tomislav and Gentle, John and Wylie, Dennis and Walling, David} } @booklet {hargrave_developing_2017, title = {Developing a Predictive Habitat Model for the Comanche Springs Pupfish (cyprinodon elegans) to Be Used in Species Recovery}, number = {TX E-159-R}, year = {2017}, publisher = {Texas Parks and Wildlife Department}, type = {Final Report}, address = {Austin, Texas, U.S.A.}, author = {Hargrave, Chad W. and Riskind, David H. and Garrett, Gary P.} } @conference {garrett_declines_2017, title = {Declines and Losses of Spring/Ci{\'e}nega Ecosystems in the Chihuahuan Desert of Texas}, booktitle = {2017 Proceedings of the Joint Meeting of Ichthyologists and Herpetologists}, year = {2017}, note = {http://hdl.handle.net/2152/61909}, publisher = {American Society of Ichthyologists and Herpetologists}, organization = {American Society of Ichthyologists and Herpetologists}, address = {Austin, Texas, U.S.A.}, abstract = {Desert ecosystems are particularly susceptible to anthropogenic influences. This is especially true for desert aquatic systems where limited water resources can be easily impaired by excessive water mining depleting the underlying aquifers. Although the aquatic environments and their associated native fishes are declining throughout the Chihuahuan Desert, we will focus on examples from the Big Bend region, the Balmorhea Springs Complex, the Pecos River region, and the Devils River region. Ongoing and impending land use and water consumption patterns suggest even further reductions in the near future. Even though numerous conservation activities are underway, archaic Texas water laws must be revisited and reformulated if the desert aquatic systems are to be truly conserved for more than the immediate future.}, doi = {10.15781/T2M32NS2K}, url = {https://repositories.lib.utexas.edu/handle/2152/61909}, author = {Garrett, Gary and Bean, Megan and Edwards, Robert and Hendrickson, Dean} } @conference {lundberg_satans_2017-1, title = {Satan{\textquoteright}s Skeleton Revealed}, year = {2017}, month = {jul}, address = {Austin, Texas, U.S.A.}, abstract = {Satan eurystomus Hubbs \& Bailey 1947, the widemouth blindcat, is endemic to the deep Edwards Aquifer below San Antonio, TX. Monotypic Satan is one of four subterranean ictalurids, Trogloglanis pattersoni, Prietella pheatophila and P. lundbergi, that all exhibit common features of stygomorphs: loss of eyes and pigmentation, hypertrophy of some chemo and mechanosensory systems, small size, and variously reduced musculoskeletal system. Each species is distinctive in its own ways, and hypotheses about their phylogenetic positions range from separate ancestries of each scattered among the lineages of epigean ictalurids to exclusive monophyly of a strictly subterranean clade. Specimens of Satan are rare, thus we used highresolution CT scans to develop the first detailed, richly illustrated descriptive and comparative study of its skeleton. Satan exhibits typical and singular reductive features plus complex structures, e.g. 3 novel symphyses closing the posterior cranial fontanel; an unusually deep temporal fossa; and an ornately shaped dorsal fin locking spinelet. Satan shares 15 synapomorphies with other ictalurid troglobites: the stygomorphisms plus bone and joint reductions. Satan shares 11 synapomorphies with Pylodictis, including increased numbers of cephalic sensory pores and paired fin rays, and several features associated with predatory suction feeding: wide gape, depressed head, expanded branchiostegal and opercular membranes and anterior extension of epaxial muscle. Incomplete character information, including lack of molecular data for Satan and Trogloglanis, poor quality of available skeletal preparations for Trogloglanis and Prietella, and uncertain identifications of some specimens of Prietella impede construction of a complete dataset for phylogenetic analysis.}, keywords = {blindcats, Satan eurystomus}, doi = {10/ghknnd}, url = {https://repositories.lib.utexas.edu/handle/2152/61885}, author = {Lundberg, John G. and Hendrickson, Dean A. and Luckenbill, Kyle and Arce H., Mariangeles} } @article {lundberg_satans_2017, title = {Satan{\textquoteright}s skeleton revealed: a tomographic and comparative osteology of Satan eurystomus, the subterranean Widemouth Blindcat (Siluriformes, Ictaluridae)}, journal = {Proceedings of the Academy of Natural Sciences of Philadelphia}, volume = {165}, number = {1}, year = {2017}, month = {oct}, pages = {117{\textendash}173}, abstract = {The Widemouth Blindcat, Satan eurystomus Hubbs and Bailey 1947, was the second of four stygobitic species of Ictaluridae discovered in the subterranean waters of southern Texas and northeastern Mexico. The skeletal anatomy of Satan has been scarcely known from a few, dated radiographs. Using additional radiographs and high resolution CT-datasets for two well-ossified specimens, we applied high-resolution X-ray computed tomography (HRXCT) to visualize, illustrate and describe the bony skeleton of Satan. We also provide an online archive of still and animated tomographic images of the skeletal anatomy of this little-known species. The skeleton and soft anatomy of Satan are distinctive. Twelve skeletal autapomorphies are described that singularly distinguish Satan within Ictaluridae and, probably in combination, from all other catfishes. Some of these are reductive losses or simplifications of skull bones (e.g. loss of one infraorbital bone; reduced ornamentation of the pterotic bone) and joint complexity (e.g. simple overlapping frontal-lateral ethmoid articulation; loosely ligamentous interopercle-posterior ceratohyal joint). Some of the autapomorphies are anatomically and perhaps developmentally complex (e.g. a novel series of three midline joints closing a middle span of the posterior cranial fontanel; a deeply excavated temporal fossa and an unusually enlarged interhyal bone). The tiny dorsal-fin spinelet (first lepidotrich) of Satan has a novel peaked and twisted shape. Ten apparent and exclusive synapomorphies within Ictaluridae gathered from this and previous studies suggest that Satan and Pylodictis are closest relatives. Most of these are functionally related to prey detection and suction feeding: fusion of the symphyseal mandibular sensory pores and increase in the number of preoperculo-mandibular canal pores; depressed, flattened heads and wide transverse mouths; prominent posterior process of the lateral ethmoid alongside and below the frontal bone margin; vertical and blade-like supraoccipital posterior process; unique arrangement of the parasagittal and occipital muscleattachment crests on the skull roof; large triangular panel of integument within the operculum framed by the opercle, preopercle and interopercle bones; elongated posterior ceratohyal; and, form of the fourth supraneural and loss of its anterior nuchal plate. In contrast, 15 synapomorphies recovered by Arce-H. et al. 2016, are confirmed suggesting that Satan is one of the four stygobitic ictalurids comprising a {\textquotedblleft}Troglobites{\textquotedblright} subclade within the family: (Trogloglanis, Satan, Prietella phreatophila, P. lundbergi). These features include three stygomorphic and reductive apomorphies that are exclusive within Ictaluridae: loss of fully developed eyes and pigmentation, and simplification of the fifth vertebra and its joint with the Weberian apparatus. Twelve other synapomorphies shown by the Troglobites are also apparent homoplasies of character states shared with various other ictalurids. These include reductive characters such as shortened lateral line canal, reduced infraorbitals and underdeveloped or incomplete ossifications of the pterotic, supraoccipital, hyoid arch bones and transcapular ligament. Also, the Troglobites and various other ictalurids have: an adnate adiposecaudal fin, foreshortened anterior cranial fontanelle, reduced ventral wings of the frontal bone, replacement of bone by cartilage in hypohyal joints; incompletely ossified transcapular ligament, and consolidation of some hypural bones. Completing a full morphological character dataset across the Troglobites has been impeded by incomplete specimen preparations and study of P. lundbergi and to a lesser extent, P. phreatophila and Trogloglanis.}, keywords = {blindcats, Prietella lundbergi, Prietella phreatophila, Satan eurystomus, Trogloglanis pattersoni}, issn = {0097-3157}, doi = {10/ghknnf}, url = {http://www.bioone.org/doi/full/10.1635/053.165.0108}, author = {Lundberg, John G. and Hendrickson, Dean A. and Luckenbill, Kyle R. and Mariangeles, Arce H} } @article {lundberg_supplementary_2017, title = {SUPPLEMENTARY ANIMATIONS \& DATA FOR: Satan{\textquoteright}s skeleton revealed: a tomographic and comparative osteology of Satan eurystomus, the subterranean Widemouth Blindcat (Siluriformes, Ictaluridae). Proceedings of the Academy of Natural Sciences of Philadelphia }, year = {2017}, abstract = {The Widemouth Blindcat, Satan eurystomus Hubbs and Bailey 1947, was the second of four stygobitic species of Ictaluridae discovered in the subterranean waters of southern Texas and northeastern Mexico. The skeletal anatomy of Satan has been scarcely known from a few, dated radiographs. Using additional radiographs and high resolution CT-datasets for two well-ossified specimens, we applied high-resolution X-ray computed tomography (HRXCT) to visualize, illustrate and describe the bony skeleton of Satan. We also provide an online archive of still and animated tomographic images of the skeletal anatomy of this little-known species. The skeleton and soft anatomy of Satan are distinctive. Twelve skeletal autapomorphies are described that singularly distinguish Satan within Ictaluridae and, probably in combination, from all other catfishes. Some of these are reductive losses or simplifications of skull bones (e.g. loss of one infraorbital bone; reduced ornamentation of the pterotic bone) and joint complexity (e.g. simple overlapping frontal-lateral ethmoid articulation; loosely ligamentous interopercle-posterior ceratohyal joint). Some of the autapomorphies are anatomically and perhaps developmentally complex (e.g. a novel series of three midline joints closing a middle span of the posterior cranial fontanel; a deeply excavated temporal fossa and an unusually enlarged interhyal bone). The tiny dorsal-fin spinelet (first lepidotrich) of Satan has a novel peaked and twisted shape. Ten apparent and exclusive synapomorphies within Ictaluridae gathered from this and previous studies suggest that Satan and Pylodictis are closest relatives. Most of these are functionally related to prey detection and suction feeding: fusion of the symphyseal mandibular sensory pores and increase in the number of preoperculo-mandibular canal pores; depressed, flattened heads and wide transverse mouths; prominent posterior process of the lateral ethmoid alongside and below the frontal bone margin; vertical and blade-like supraoccipital posterior process; unique arrangement of the parasagittal and occipital muscle-attachment crests on the skull roof; large triangular panel of integument within the operculum framed by the opercle, preopercle and interopercle bones; elongated posterior ceratohyal; and, form of the fourth supraneural and loss of its anterior nuchal plate. In contrast, fifteen synapomorphies recovered by Arce-H. et al. 2016, are confirmed suggesting that Satan is one of the four stygobitic ictalurids comprising a {\textquotedblleft}Troglobites{\textquotedblright} subclade within the family: (Trogloglanis, Satan, Prietella phreatophila, P. lundbergi). These features include three stygomorphic and reduction apomorphies that are exclusive within Ictaluridae: loss of fully developed eyes and pigmentation, and simplification of the fifth vertebra and its joint with the Weberian apparatus. Twelve other synapomorphies shown by the Troglobites are also apparent homoplasies of character states shared with various other ictalurids. These include reductive characters such as shortened lateral line canal, reduced infraorbitals and underdeveloped or incomplete ossifications of the pterotic, supraoccipital, hyoid arch bones and transcapular ligament. Also, the Troglobites and various other ictalurids have: an adnate adipose-caudal fin, foreshortened anterior cranial fontanelle, reduced ventral wings of the frontal bone, replacement of bone by cartilage in hypohyal joints; incompletely ossified transcapular ligament, and consolidation of some hypural bones. Completing a full morphological character dataset across the Troglobites has been impeded by incomplete specimen preparations and study of P. lundbergi and to a lesser extent, P. phreatophila and Trogloglanis.}, keywords = {blindcats, Satan eurystomus, Trogloglanis pattersoni}, doi = {10/ghknng}, url = {https://repositories.lib.utexas.edu/handle/2152/62261}, author = {Lundberg, John G. and Hendrickson, Dean A. and Luckenbill, Kyle R. and Arce H., Mariangeles} } @conference {hendrickson_tale_2017, title = {A tale of two catfishes: Yaqui and Chihuahua}, booktitle = {Proceedings of the Desert Fishes Council}, year = {2017}, month = {nov}, publisher = {Deseert Fishes Council}, organization = {Deseert Fishes Council}, address = {San Luis Rio Colorado, Sonora, Mexico}, abstract = {While the Yaqui Catfish, Ictalurus pricei, has a long history of listing and conservation interest, the still undescribed Chihuahua Catfish remains largely unknown to many working on fishes and aquatic resource management in its range. Like Yaqui Catfish, it is similar to the ubiquitous Channel Catfish, and until awareness is increased, it will remain understudied and with little protection. Also like Yaqui Catfish, hybridization with closely related species greatly confounds research and recovery efforts. Known only from an unfinished manuscript describing it, and many specimens identified cryptically (since it remains undescribed) as this species in a few collections{\textquoteright} databases, and occasional mentions in the literature, its historic distribution includes most of the Rio Grande/Bravo watershed (including all 3 major sub-basins (Conchos, Pecos, Grande/Bravo) and a relatively small area of the Gila River basin. It appears to be now very rare, and it appears to hybridize with both I. punctatus and I. lupus. Cytochrome b sequences obtained from one recently collected specimen from each the Gila basin and the Conchos basin in Chihuahua (at or very near the manuscript{\textquoteright}s type locality), indicate two divergent haplotypes. The manuscript{\textquoteright}s authors did not recognize that divergence, and considered it introduced in the Gila, so did not include specimens from there in their morphological analysis, but thought the form there to be introduced from the R{\'\i}o Grande/Pecos. We{\textquoteright}ll here present images of specimens, and summarize the diagnostic characters known from the manuscript, though hybridization clearly confounds morphological diagnosis. All those collecting catfishes anywhere in the species{\textquoteright} broad range are asked to be aware of its existence, and to deposit large series of vouchers and tissues in museum collections for future efforts to better diagnose these rare fishes and conserve them.}, doi = {http://dx.doi.org/10.26153/tsw/1551}, url = {https://repositories.lib.utexas.edu/handle/2152/74431}, author = {Hendrickson, Dean A.} } @inbook {williams_cold-water_2017, title = {Cold-Water Fishes and Climate Change in North America}, booktitle = {The Encyclopedia of the Anthropocene}, series = {Reference Module in Earth Systems and Environmental Sciences}, volume = {2}, year = {2017}, note = {https://doi.org/10.1016/B978-0-12-809665-9.09505-7}, month = {nov}, pages = {103{\textendash}111}, publisher = {Elsevier}, organization = {Elsevier}, abstract = {Trout, salmon, grayling and whitefishes (Salmonidae) are among the most ecologically and economically important fishes. They also are among the most vulnerable to global warming, and increasing drought, floods, and wildfires. In North America, salmonids occur from central Mexico northward along coastal regions and mountainous interiors to the Arctic Plains. A variety of existing stressors have reduced population sizes and extent and fragmented habitats, making salmonid populations increasingly vulnerable to climate-driven disturbances. This contribution explores specific threats posed by climate change and suggests actions that can help these coldwater-dependent species adapt to an increasingly warm and uncertain future.}, keywords = {Climate Change, Cumulative impacts, Disturbances, Drought, Fish conservation, Floods, Global warming, Ocean acidification, Salmon, Stream restoration, trout, Wildfire}, url = {https://doi.org/10.1016/B978-0-12-809665-9.09505-7}, author = {J.E. Williams and Isaak, D. J. and Imhof, J. and Hendrickson, D.a. and McMillan, J.R.}, editor = {DellaSala, Dominick A. and Goldstein, Michael I.} } @conference {dugan_conservation_2017, title = {Conservation status assessment of the endangered Mexican Blindcat, Prietella phreatophila}, year = {2017}, address = {Austin, Texas, U.S.A.}, abstract = {Discovery of the Mexican blindcat, Prietella phreatophila, in Texas in 2016 generated interest in the species, which had previously only been known from Mexico but is listed as a foreign endangered species in the US. Consequently, an effort was undertaken to conduct a conservation status assessment of the fish using standardized methods developed by NatureServe. These assessments aim to determine the extinction risk of species and produce conservation ranks, which can be used to inform listing statuses and policy decisions and to determine conservation priorities. The rank is determined by assessing factors in three main categories: rarity, threats, and trends. Here we used three rarity and one threat factor in the NatureServe rank calculator to determine the global conservation rank of P. phreatophila. Known occurrences were compiled, and the online tool GeoCAT (geospatial conservation assessment tool) was used to determine range extent and area of occupancy. Number of occurrences (e.g., populations) was estimated based on the spatial distribution of observations and their proximity to one another. Threat comprised scope, which was assessed in ArcGIS by intersecting the total area covered by a given threat with the known occurrence area of P. phreatophila, and severity, which was estimated based on expert opinion. The resulting conservation rank was G2 (globally imperiled; roughly equivalent to IUCN{\textquoteright}s Vulnerable rank); however, complete data were not available for any factor thus motivating the need for further study. When new data are available, the rank can be easily updated with this new information using the rank calculator.}, doi = {10.15781/T2FJ29V47}, url = {https://repositories.lib.utexas.edu/handle/2152/61887}, author = {Dugan, Laura E. and Hendrickson, Dean A. and Hern{\'a}ndez-Espri{\'u}, Antonio and Garrett, Gary P. and Cohen, Adam E. and Wolaver, Brad and Smith, Ryan} } @conference {hendrickson_discovery_2017-1, title = {Discovery of Endangered Mexican Blindcat, Prietella phreatophila, in Texas: Implications for International Groundwater Management and Evolution of the Regional Karst Aquifer Biota}, year = {2017}, month = {jul}, address = {Austin, Texas, U.S.A.}, abstract = {Mexican blindcat, Prietella phreatophila, described in 1954 from a cave system near the town of M{\'u}zquiz in central Coahuila state, and considered a Mexican endemic, was listed by the U.S. Fish and Wildlife Service as a foreign endangered species (protected "wherever found") in 1970. Explorations in the 1990s discovered many new localities extending nearly to the international border, and in 2016 the species was discovered in Amistad National Recreation Area (ANRA) in Texas, just north of the international border near Del Rio. Not only does the discovery support the aquifer of this fish being an internationally shared resource, but the stygobitic invertebrate biota found with the fish indicates a potentially large extent of the aquifer, and thus possibly the fish, in Texas. Invertebrate faunal connections (historic or current) extend from the Amistad Lake area of the new occurrence west into the Trans-Pecos region and east into the Edwards Aquifer of central Texas. We explore implications of this for both water management and evolutionary history of this and other blind ictalurids, and suggest that population genetic studies of both stygobitic fishes and invertebrates could help hydrogeologists better define often difficult to map aquifer extents and interconnections. While NPS is continuing to support the cave explorations of ANRA that produced the Texas discovery, we propose a broader bi-national sampling effort for both the fish and invertebrates extending well beyond the current known distribution of P. phreatophila. We also pointed out questions about phylogenetic relatedness of P. phreatophila and P. lundbergi further south, as well as the possibility of a monophyletic clade of blindcats, including those of the Edwards Aquifer, Satan and Trogloglanis. If substantiated, that evolutionary history would imply broader historic inter-aquifer connections ranging from the San Antonio area as far south as southernmost Tamaulipas. Finally, we report establishment of a small captive population of Prietella phreatophila at San Antonio Zoo for research and possibly eventual conservation applications.}, keywords = {blindcats, Prietella lundbergi, Prietella phreatophila, Satan eurystomus, Trogloglanis pattersoni}, doi = {10.15781/T2K931N9V}, url = {https://repositories.lib.utexas.edu/handle/2152/61886}, author = {Hendrickson, Dean A. and Hern{\'a}ndez-Espri{\'u}, Antonio and Dugan, Laura and Sprouse, Peter and D{\'a}vila Paul{\'\i}n, Jos{\'e} Antonio and Krejca, Jean and Gluesenkamp, Andrew and Reddell, James and Smith, Ryan and Howard, Sarah and Johnson, Jack and Garrett, Gary P. and Cohen, Adam E. and Garc{\'\i}a De Le{\'o}n, Francisco J. and Wolaver, Brad and Fenolio, Dante B.} } @conference {gluesenkamp_mexican_2017, title = {The Mexican Blindcat Project: new discoveries and future efforts}, year = {2017}, month = {mar}, abstract = {The endangered Mexican blindcat (Prietella phreatophila, Carranza 1954) is one of only four stygobitic ictalurid catfish in North America. Members of two monotypic genera (Satan eurystomus and Trogloglanis pattersoni) are known from the Edwards Aquifer in Texas and, until recently, Prietella (represented by P. lundbergi and P. phreatophila) was only known to occur in Mexico (northern Coahuila to southern Tamaulipas). The recent discovery of P. phreatophila in a cave on the Amistad National Recreation Area in Val Verde County, Texas is the result of decades of sporadic effort on both sides of the US/Mexican border and has stimulated a renewed effort to investigate the distribution, ecology, evolutionary history, and conservation status of this species. Collaborative efforts among The San Antonio Zoo, The University of Texas at Austin, Zara Environmental and The National Park Service are currently focused on habitat surveys in Texas as well as captive husbandry and propagation. Future efforts will include collaborators from the Comisi{\'o}n Nacional de {\'A}reas Naturales Protegidas, {\'A}rea de Protecci{\'o}n de Recursos Naturales Sabinas, and the Laboratorio de Gen{\'e}tica para la Conservaci{\'o}n, Centro de Investigaciones Biol{\'o}gicas del Noroeste, La Paz to conduct expanded fieldwork in Mexico, hydrogeologic studies, and surveys using environmental DNA.}, keywords = {blindcats, Prietella phreatophila}, doi = {10.15781/T29S1M20H}, url = {https://repositories.lib.utexas.edu/handle/2152/61888}, author = {Gluesenkamp, Andrew and Hendrickson, Dean A. and Sprouse, Peter} } @conference {hendrickson_american_2017, title = {American Eels in Texas {\textendash} a review of what is known, what is being done to learn more, and how you can help}, year = {2017}, month = {nov}, address = {Bandera, Texas}, abstract = {This presentation reviews the current status of knowledge about the American Eel, its conservation status and distribution in Texas, and work in progress to learn more about the species in Texas.}, doi = {10.15781/T2HQ3SF4C}, url = {https://repositories.lib.utexas.edu/handle/2152/62549}, author = {Hendrickson, Dean A.} } @conference {hendrickson_discovery_2017, title = {Discovery of the Mexican Blindcat, Prietella phreatophila, in the U.S., and an update on its rangewide conservation status}, booktitle = {Proceedings of the Texas Academy of Sciences}, year = {2017}, month = {mar}, address = {Mary Hardin Baylor University, Belton, Texas}, abstract = {Mexican blindcat, Prietella phreatophila, was described in 1954 from a single locality in Northern Coahuila, M{\'e}xico. Long listed as endangered by the Mexican federal government, it was listed by the U.S. Fish and Wildlife Service as a foreign endangered species in 1970, and the most recent (1996) update of its assessment for the IUCN Red List considers it endangered as well. Explorations in the late 1990s discovered many new localities extending nearly to the international border, and a captive population established provided insights into the species{\textquoteright} basic biology and behavior. In 2016 the species was discovered in a cave in the Amistad National Recreation Area (ANRA), just north of the R{\'\i}o Grande in Texas. The 1970 listing instantly gave the TX population full protection under the U.S. Endangered Species Act. The species{\textquoteright} subterranean and mostly inaccessible habitat endows it with extremely low detectability and its actual range is likely broader than physical sampling of specimens has revealed. We review all prior and new knowledge of the species and its habitat to provide an updated international reassessment of its overall conservation status and threats, which most notably include aquifer depletion and contamination in both the Mexican and U.S. portions of its known range. A live captive population of two specimens collected in 1997 in Coahuila and one Texas specimen is now at the San Antonio Zoo, we are working with NPS to further explore ANRA caves and hope eventually to return to Coahuila to more fully update the species{\textquoteright} conservation status.}, doi = {10.15781/T2FF3M51W}, url = {https://repositories.lib.utexas.edu/handle/2152/46164}, author = {Hendrickson, Dean A. and Johnson, Jack and Sprouse, Peter and Howard, Sarah and Garrett, Gary P. and Krejca, Jean K. and Gluesenkamp, Andrew and D{\'a}vila Paul{\'\i}n, Jos{\'e} Antonio and Dugan, Laura and Cohen, Adam E. and Hern{\'a}ndez Espri{\'u}, Antonio and Sullivan, John P. and Fenolio, Dant{\'e} B. and Karges, John and Smith, Ryan and Garc{\'\i}a De Le{\'o}n, Francisco J. and Wolaver, Brad and Reddell, James} } @article {pine_growth_2017, title = {Growth of Endangered Humpback Chub in Relation to Temperature and Discharge in the Lower Colorado River}, journal = {Journal of Fish and Wildlife Management}, volume = {8}, number = {1}, year = {2017}, month = {mar}, pages = {322{\textendash}332}, abstract = {Assessments of growth can provide information needed to understand how fish populations respond to changing environmental conditions and management actions, including ecosystem experimentation. We estimated growth rates and parameter uncertainty from otoliths of endangered Humpback Chub Gila cypha from the Colorado River in Grand Canyon, Arizona. We then compared growth of Humpback Chub \textless age 2 that were 1) occupying the mainstem Colorado River during a period of variable discharge and cooler water temperatures (1980{\textendash}1998; epoch 1), 2) occupying the Colorado River during a period of moderate discharge variability and warmer water (2001{\textendash}2011; epoch 2), and 3) occupying the unregulated Little Colorado River. Because growth rates of juvenile Humpback Chub (\textless age 2) may be more sensitive to changes in environmental conditions than adult fish, we used analysis of covariance and linear models to compare growth of juvenile fish (slopes) between epochs and capture sites (mainstem Colorado River vs. Little Colorado River). Our analysis of covariance results were ambiguous (age {\texttimes} epoch {\texttimes} site interaction; P = 0.06). However, individual linear regressions of size and age by epoch and site suggest biologically important differences in growth, as evidenced by slower growth in the Colorado River in epoch 1 than in epoch 2, and slower growth in the Colorado River compared with the Little Colorado River for all time periods. Overall our results 1) provide information on growth and growth variability useful for parameterizing models to assess population viability and 2) provide empirical information on how growth of juvenile and adult Humpback Chub growth may respond to changing environmental conditions.}, issn = {1944-687X}, doi = {10.3996/062014-JFWM-046}, url = {http://www.fwspubs.org/doi/abs/10.3996/062014-JFWM-046}, author = {Pine, W. E. and Limburg, K. and Gerig, B. and Finch, C. and Chagaris, D. and Coggins, L. and Speas, D. and Hendrickson, D.a.} } @inbook {garrett_mining_2017, title = {Mining Hidden Waters: Groundwater Depletion and Loss of Aquatic Diversity in the Chihuahuan Desert of Texas}, booktitle = {Standing Between Life and Extinction: Ethics and Ecology of Conserving Aquatic Species in the American Southwest}, year = {2017}, month = {mar}, abstract = {Desert ecosystems are particularly susceptible to anthropogenic influences. This is especially true for desert aquatic systems where limited water resources can be easily impaired by excessive water mining depleting the underlying aquifers. We discuss the decline of these aquatic environments throughout the Chihuahuan Desert region of Texas and present observations on the relationship between declining aquifer levels and the status of native fishes. Examples from the Big Bend region, the Balmorhea Springs Complex, the Pecos River region, and the Devils River region reveal a decline in distribution and abundance of native species (including extirpations and extinctions) resulting from declining water supplies. Ongoing and impending land use and water consumption patterns point to even further reductions in the near future. However, there are activities underway that offer some optimism in the region. Native Fish Conservation Areas are being developed to enhance management of these desert ecosystems in a way that provides functional watersheds with self-sustaining populations of native species. Increased awareness by landowners of the value of cooperative conservation of aquatic resources and mechanisms to include them in management decisions are critically important, particularly in Texas where the vast majority of land is privately owned. Ultimately, archaic Texas water laws need to be revisited and reformulated if the desert aquatic systems are to be truly conserved for more than the immediate future.}, author = {Garrett, Gary P. and Bean, Megan G. and Edwards, Robert J. and Hendrickson, Dean A.}, editor = {Propst, David L. and Williams, Jack E. and Bestgen, Kevin R. and Hoagstrom, Christopher W.} } @article {hendrickson_utility_2017, title = {Utility of Mining of Diverse Historic and Current Data Sources for Insights into Distribution and Ecology ofAmerican Eels in the Gulf of Mexico and Its Tributaries}, journal = {F1000Research}, volume = {6}, year = {2017}, month = {feb}, abstract = {Compilation of basic occurrence records of American Eel in Texas revealed not only a general paucity of data, but also biases of different sources, and overall, inaccessibility of many different sources of useful records. Methodical searching, mining, normailization and basic data cleaning across a diversity of resources provided a much better picture of temporal and spatial occurrences of the species than had readily available sources. Similar data mining and sharing by all researchers and managers could greatly improve overall understanding of the species in the GoM and its tributaries, and help focus monitoring and research efforts.}, keywords = {Anguilla rostrata, Gulf of Mexico, Texas}, doi = {10.7490/f1000research.1113693.1}, url = {https://f1000research.com/slides/6-177}, author = {Hendrickson, Dean A.} } @booklet {price_ut_2016, title = {UT fish collection casts net wide, catches big data}, journal = {Austin American-Statesman}, year = {2016}, month = {sep}, abstract = {On a recent afternoon at the University of Texas{\textquoteright} J.J. Pickle Research Campus, researcher Adam Cohen reached elbow deep into a bright blue barrel}, url = {https://www.statesman.com/news/20160903/ut-fish-collection-casts-net-wide-catches-big-data}, author = {Price, Asher} } @inbook {hendrickson_prologo_2016, title = {Prologo / Prologue}, booktitle = {La Trucha Dorada Mexicana}, year = {2016}, month = {dec}, pages = {v{\textendash}vii}, publisher = {Arturo Ruiz Luna and Francisco Garc{\'\i}a de Le{\'o}n}, organization = {Arturo Ruiz Luna and Francisco Garc{\'\i}a de Le{\'o}n}, edition = {1}, address = {M{\'e}xico}, keywords = {Chihuahua, Durango, Mexican trout}, isbn = {978-607-7900-26-9}, url = {https://cibnor.repositorioinstitucional.mx/jspui/handle/1001/1364}, author = {Hendrickson, Dean A.} } @article {hendrickson_discovery_2016, title = {Discovery of the Mexican Blindcat, Prietella phreatophila, in the U.S., and an update on its rangewide conservation status}, journal = {F1000Research}, volume = {5}, year = {2016}, month = {dec}, abstract = {A natural population of the Mexican blindcat, Prietella phreatophila Carranza 1954, previously known only from M{\'e}xico, was documented in 2016 from a cave in the Amistad National Recreation Area in Texas. Occurrence of the species in Texas is consistent with other indicators of international interconnections of aquifers in this region under the R{\'\i}o Grande. Long listed as Endangered by the Mexican government, it was also listed by the U.S. Fish and Wildlife Service as Endangered in 1970, and so the Texas population is fully protected under the Endangered Species Act as Endangered. As a result of the extremely low detectability of the species and very limited access to its habitat to sample, it is likely that the range of the species in both countries is broader than physical sampling of specimens has revealed. Here we review all previous knowledge of the species and its habitat and provide a reassessment of its overall conservation status and threats, most notably including aquifer depletion and contamination in both the Mexican and U.S. portions of its known range.}, keywords = {Prietella phreatophila}, doi = {10.7490/f1000research.1113512.1}, url = {https://f1000research.com/slides/5-2837}, author = {Hendrickson, Dean A. and Johnson, Jack and Sprouse, Peter and Howard, Sarah and Garrett, Gary P. and Krejca, Jean K. and Cohen, Adam E. and Fenolio, Dant{\'e} and Gluesenkamp, Andy and D{\'a}vila Paulin, Jos{\'e} Antonio and Dugan, Laura} } @article {mayes_enigmatic_2016, title = {The Enigmatic Eel {\textendash} A Metamorphic Journey}, journal = {Texas Watersheds: Conservation news from headwaters to coast}, volume = {Spring 2016}, year = {2016}, pages = {1{\textendash}2}, abstract = {The American eel, Anguilla rostrata, is an amazing catadromous (living in fresh water and spawning in the ocean) fish with a remarkable life history involving huge migrations. Immature adults, a.k.a. {\textquotedblleft}yellow eel,{\textquotedblright} live in freshwater rivers, lakes, and estuaries, feeding on fishes and invertebrates for 5 to 20 years before making a remarkable, long-distance journey to the Atlantic Ocean to spawn in the depths of the Sargasso Sea (by the Bermuda Triangle).}, keywords = {Anguilla rostrata}, url = {https://tpwd.texas.gov/publications/pwdpubs/media/pwd_br_t3200_003_6_16.pdf}, author = {Mayes, Kevin and Hendrickson, Dean A.} } @booklet {hendrickson_year_2016, title = {Year 1 report for {\textquoteleft}Conserving Texas Biodiversity: Status, Trends, and Conservation Planning for Fishes of Greatest Conservation Need{\textquoteright}}, number = {grant TX T-106-1 (CFDA\# 15.634), Contract No. 459125 UTA14-001402)}, year = {2016}, pages = {1{\textendash}177}, publisher = {Texas Parks and Wildlife Department}, address = {Austin, Texas, U.S.A.}, abstract = {Substantive progress was made on all major Project Activities in this first year: Activity 1. Coordinate and Facilitate Science and Conservation Actions for Conserving Texas Biodiversity - We expanded and strengthened UT-TPWD coordination, transitioning the relationship between these partners into a much more collaborative one than was previously realized. The flow of data between TPWD and the Fishes of Texas Project (supported in part by this project) has become much more bi-directional. Many newly collected TPWD specimens, agency databases, legacy data products and reports, and feedback from resource managers are now beginning to contribute substantively to growth and diversity (now including non-specimen-vouchered records) of data served through the FoTX Project{\textquoteright}s websites. Work on cleaning and normalizing of FoTX{\textquoteright}s online specimen-vouchered database continued, and the updated FoTX occurrence and distribution data are being actively used. Most recently they were used by this project, together with expert (TPWD, UT and others{\textquoteright}) opinions, to develop recommendations on conservation status of native fishes of Texas{\textquoteright} Species of Greatest Conservation Need for TPWD{\textquoteright}s consideration in anticipated updates to the Texas Conservation Action Plan. Within two months of this report, a new and substantially larger and improved version of the FoTX website/database and related collection of images, field notes, and ancillary datasets, will be formally announced. Activity 2. Identify Priority Geographic Management Units for Conserving Fishes of Greatest Conservation Need - We used FoTX data in a systematic conservation area prioritization analysis to identify Native Fish Conservation Areas (NFCAs) for large portions of Texas where such comprehensive planning had not been previously carried out. Updated and new FoTX data for all Texas fish Species of Greatest Conservation Need (SGCN) were used in production of newly improved Species Distribution Models for input into this planning process, and the results of the planning exercise have already been integrated by TPWD into management prioritizations of both those species and the resultant NFCAs. Activity 3. Develop Monitoring and Conservation Plans for Native Fish Conservation Areas - Monitoring and conservation plans were delivered to TPWD for all NFCAs identified in Activity 2. Activity 4. Conduct Field-Based Surveys Detailed Biodiversity Assessments (i.e. Bioblitzing), and Citizen-Based Monitoring - Field surveys with detailed biodiversity assessments ({\textquotedblleft}bioblitzes{\textquotedblright}) and citizen-based monitoring were conducted in three areas selected collaboratively by TPWD and FoTX Project staff from within the identified NFCAs: Nueces River headwaters, Big Cypress Bayou basin, and Village Creek basin. Along with this field effort, FoTX Project staff developed and circulated guidelines and best practices, and provided training for citizen-based monitoring that leverages iNaturalist for capture and reporting of photo-vouchered occurrence records in ways that will help assure scientifically useful data are obtained. All specimens acquired during these field efforts, and from many other routine specimen acquisitions from across the state (1845 total records/jars of specimens), were cataloged in the UT Fish Collection database. From there, these new records will soon be fed into GBIF, VertNet, FishNet2 and other major online data aggregators, including the online Fishes of Texas database.}, keywords = {Fishes of Texas Project}, url = {https://repositories.lib.utexas.edu/handle/2152/32905}, author = {Hendrickson, Dean A. and Garrett, Gary P. and Labay, Ben J. and Cohen, Adam E. and Casarez, Melissa} } @conference {hendrickson_american_2016, title = {American Eel in Texas {\textendash} what we do, don{\textquoteright}t, and need to, know}, year = {2016}, address = {Kerrville, Texas, USA}, abstract = {American Eel is undoubtedly one of the most studied freshwater fishes of North America. Many recent discoveries have added new insights that re-write important aspects of the {\textquotedblleft}text book{\textquotedblright} knowledge of the species{\textquoteright} complex life history in ways that could have significant impacts on management. Despite all of this new information, debate about the species{\textquoteright} conservation status continues, and new threats, such as continued habitat loss and major clandestine fisheries driven by extremely high value in the global market, have further complicated management. Though USFWS recently decided that the species does not merit listing as {\textquotedblleft}Endangered,{\textquotedblright} in 2012 Canada changed that country{\textquoteright}s assessment of the species{\textquoteright} status from {\textquotedblleft}Special Concern{\textquotedblright} (since 2006) to {\textquotedblleft}Threatened{\textquotedblright} and IUCN upped its classification in 2013 to {\textquotedblleft}Endangered.{\textquotedblright} Ontario has considered it {\textquotedblleft}Endangered{\textquotedblright} since 2007. All U.S. Atlantic states vowed to work together to produce, in 1999, the American Eel Benchmark Stock Assessment, which mandated each state conduct standardized monitoring of recruitment and later, mandatory catch and effort monitoring. Given all that activity and data generation, it is remarkable that still so little is known about the populations of the Gulf of Mexico (GOM) and its tributary rivers that making any management decisions in that large, neglected part of the species{\textquoteright} range is virtually impossible. The Fishes of Texas Project team has been collating and improving the limited and scattered data on occurrences of the species in the region and concludes it important to promote a broad scale (Gulf of Mexico) collaborative community effort to acquire and share data and carefully curated specimens and, hopefully, develop a GOM-wide collaborative research and management plan like that implemented by Atlantic states. Here we{\textquoteright}ll review the literature and state of knowledge about the species in Texas and GOM, and suggest ways to begin work toward such an effort.}, keywords = {Anguilla rostrata, Fishes of Texas, Fishes of Texas Project}, doi = {10.15781/T2KH1W}, url = {https://doi.org/10.15781/T2KH1W}, author = {Hendrickson, Dean A. and Cohen, Adam E. and Labay, Ben and Garrett, Gary P. and Casarez, Melissa and Martin, F. Douglas} } @article {hanna_conservation_2015, title = {Conservation Genetics of Six Species of Genus \textitDionda (Cyprinidae) in the Southwestern United States}, journal = {Monographs of the Western North American Naturalist}, volume = {8}, number = {1}, year = {2015}, pages = {1{\textendash}25}, abstract = {We examined allelic variation at nuclear-encoded microsatellites and sequences of mitochondrial (mt)DNA in 10 geographic samples representing 6 nominal species of the cyprinid genus Dionda. Species of Dionda are found in springs and spring-fed headwaters in the southwestern United States and Mexico and are of particular interest to conservation and management, in part because of their limited distribution and habitat specificity, and in part as indicator species of habitat quality. All 10 samples examined appear to be discrete, demographically independent populations, with greater observed FST values between or among samples within species (0.123{\textendash}0.280) than threshold values above which demographic independence is indicated. All 10 exhibited microsatellite and mtDNA variation comparable to or lower than that found in other cyprinids considered to be threatened or endangered; across microsatellites, average number of alleles across populations ranged from of 2.09 to 9.76, allelic richness from 2.24 to 8.45, and gene diversity from 0.0211 to 0.606; for mtDNA, the number of haplotypes across populations ranged from 1 to 14. Estimates of historical and present-day genetic demography indicated that all 10 populations have experienced order-of-magnitude declines in effective population size, with lower bounds of time intervals for the declines in 9 of the populations ranging from 6 to 65 years. Estimates of average long-term effective population size (536 in Dionda argentosa from San Felipe Creek to 2335 in D. texensis) and effective number of breeders (22 in D. flavipinnis from Fessenden Spring to 555 in D. diaboli from Devils River) also indicated recent declines in effective size, and at least 5 of the populations appear to have undergone recent, severe bottlenecks (mean Mc range 0.806{\textendash}0.848, P value range 0.000{\textendash}0.0350). The observation that all 10 populations are demographically independent indicates that local extirpations likely would not be replaced by new migrants and that loss of any of the populations would represent loss of a unique genetic entity. Conservation recommendations for each of the populations are briefly discussed.}, issn = {1545-0228, 1944-8236}, doi = {10.3398/042.008.0101}, url = {http://www.bioone.org/doi/10.3398/042.008.0101}, author = {Hanna, Ashley H. and Carson, Evan W. and Garrett, Gary P. and Gold, John R.} } @inbook {garrett_guadalupe_2015, title = {Guadalupe Bass Restoration Initiative}, booktitle = {Black Bass Diversity: Multidisciplinary Science for Conservation}, series = {American Fisheries Society Symposium}, volume = {82}, year = {2015}, pages = {635{\textendash}657}, publisher = {American Fisheries Society}, organization = {American Fisheries Society}, address = {Bethesda, Maryland, USA}, author = {Garrett, Gary and Birdsong, Timothy and Bean, Megan and McGillicuddy, Ryan}, editor = {Dauwalter, Daniel C. and Birdsong, Timothy W. and Garrett, Gary P.} } @inbook {tringali_inferred_2015, title = {Inferred Reproductive Behavior of Captive Guadalupe Bass}, booktitle = {Black Bass Diversity: Multidisciplinary Science for Conservation}, series = {American Fisheries Society Symposium}, volume = {82}, year = {2015}, pages = {549{\textendash}584}, publisher = {American Fisheries Society}, organization = {American Fisheries Society}, address = {Bethesda, Maryland, USA}, abstract = {Attempts to infer mating systems in wild fish populations can be limited by the logistics of locating nests and thoroughly sampling offspring and potential participants. Captive populations are more easily evaluated but may exhibit modified behavior. We used microsatellites (17 loci) to determine parentage among production offspring and infer the mating system of raceway spawning Guadalupe Bass Micropterus treculii, which are part of a supplemental stocking program. Offspring were collected over the course of two production seasons (n = 303 and 492). Spawning activity was nonrandom, with respect to location and time in most compartments, and individuals that spawned were significantly larger, by length and weight, than individuals that did not. During the first year of captivity, significantly fewer males (21 of 60) than females (49 of 61) spawned. Inequalities between the number of nest locations used and the numbers of spawning males and females suggest that males recruited females to spawning sites. While most spawning females (61\%) participated with a single mate, most spawning males (90\%) participated with multiple females and only 3\% of mating pairs were monogamous. This predominantly polygynous mating system contrasts with the primarily monogamous systems of wild congeners and resulted in an effective number of breeders (Nb) less than 30\% of the number of penned broodfish. Quarantining particularly prolific males to separate pens during the second year of captivity had little effect on mating behavior, as other males filled their roles. This represents the first documentation of mate choice and fidelity in Guadalupe Bass and provides a template for expected reproductive behavior in a standard hatchery setting. Understanding mating systems, including the effects of captivity on behavior, should enhance restoration efforts, particularly when supplemental stocking programs are involved.}, isbn = {978-1-934874-40-0}, doi = {10.47886/9781934874400.ch41}, url = {https://fisheries.org/doi/9781934874400-ch41}, author = {Lutz-Carrillo, Dijar and Thibodeaux, Chris and Elliott, Megan and Rathjen, Nicholas A. and Kittel, Carl and Fries, Loraine T. and Garrett, Gary P.}, editor = {Tringali, Michael D. and Long, James M. and Birdsong, Timothy W. and Allen, Micheal S.} } @inbook {tringali_reducing_2015, title = {Reducing hybridization and introgression in wild populations of Guadalupe Bass through supplemental stocking}, booktitle = {Black Bass Diversity: Multidisciplinary Science for Conservation}, series = {American Fisheries Society Symposium}, volume = {82}, year = {2015}, pages = {537{\textendash}547}, publisher = {American Fisheries Society}, organization = {American Fisheries Society}, address = {Bethesda, Maryland, USA}, abstract = {Interspecific hybridization among micropterids was once thought to be rare but has been documented in several cases of North American endemics. Introduction of the nonnative Smallmouth Bass Micropterus dolomieu across Texas has threatened to eliminate the Guadalupe Bass M. treculii genome throughout its native range via introgression between the species. In 1992, the Texas Parks and Wildlife Department began a stocking program in the Guadalupe River watershed to restore the genetic integrity of the local population. More than 600,000 hatchery-reared Guadalupe Bass fingerlings (\textasciitilde30 mm total length) were stocked in Johnson Creek over a 19-year period, and 360,000 fish were released in the North Fork, South Fork, and main-stem Guadalupe River over a 5-year period. Annual genetic monitoring indicated that hybridization significantly declined in all stream segments (P \textless 0.001) during the period of time when stocking occurred. Initially high hybridization rates (range, 20{\textendash}100\%; mean = 43.4\%) were reduced to 0{\textendash}24.2\% (mean = 11.4\%) at the termination of stocking. Linear regression indicated that hybridization in the North Fork and main-stem stream segments declined faster (9.0\% per year) than all other test stream segments, whereas the South Fork Guadalupe River and upper Johnson Creek declined at 0.9\% per year and lower Johnson Creek declined at 1.9\% per year. Our data show that supplemental stocking is an effective approach to genetic restoration of compromised populations and should be considered as a viable management and conservation tool.}, isbn = {978-1-934874-40-0}, doi = {10.47886/9781934874400.ch41}, url = {https://fisheries.org/doi/9781934874400-ch41}, author = {Fleming, B. Paul and Garrett, Gary P. and Smith, N. T.}, editor = {Tringali, Michael D. and Long, James M. and Birdsong, Timothy W. and Allen, Micheal S.} } @conference {gordon_fluviageny_2015-1, title = {The "Fluviageny": Analyzing Temporal River Fragmentation Using Phylogenetics}, booktitle = {Proceedings of 2015 Annual Meeting of the Texas Chapter of the American Fisheries Society}, year = {2015}, publisher = {Texas Chapter American Fisheries Society}, organization = {Texas Chapter American Fisheries Society}, address = {Tyler, Texas, USA}, url = {https://units.fisheries.org/tx/tc-meetings/2015-meeting-home-page/}, author = {Gordon, Andrew Lloyd and Hendrickson, Dean~A. and Labay, Benjamin J.} } @article {hendrickson_fishes_2015-1, title = {Fishes of Texas Project Database (Version 2.0) Darwin Core}, journal = {University of Texas at Austin, Biodiversity Collections accessed via GBIF.org}, volume = {Occurrence dataset}, year = {2015}, month = {sep}, abstract = {The Fishes of Texas Project (www.fishesoftexas.org) compiled Texas fish species occurrence records from 42 museum collections and applied rigorous quality control and data normalization/standardization to result in 124,415 specimen-based records collected between 1851 and 2010 by 5,924 collectors. Though Gulf of Mexico and estuarine records are included, manual georeferencing of localities focused primarily on inland (freshwater) Texas records, resulting in 88,348 records from 7,868 unique Texas inland localities, all with estimates of placement error. Though not all georeferenced, 8,460 marine (Gulf of Mexico) and 18,923 inland records from neighboring Mexican and U.S. states have been partially processed. All georeferenced records were plotted and 4,107 geographic outliers flagged as potential identification or location errors. Most flagged specimens, and often related original documentation, were examined and identifications corrected or confirmed. Data curation methodology is thoroughly documented in the website, where the dataset can be queried in diverse ways, mapped, and data downloaded. Also online are a large set of high quality fish images, collectors{\textquoteright} field notes, specimen photos, species distribution models derived from the data, accounts of species{\textquoteright} biology and ecology, and digital identification keys. Users can comment on any record and upload images, field notes and other documentation.}, keywords = {Fishes of Texas Project, FoTX}, doi = {https://doi.org/10.15468/fjhjbb}, url = {http://www.fishesoftexas.org/documentation/}, author = {Hendrickson, Dean A. and Cohen, Adam E.} } @article {hendrickson_fishes_2015, title = {Fishes of Texas Project Database (Version 2.0)}, year = {2015}, note = {Publisher: University of Texas at Austin, Texas Advanced Computing Center (https://www.tacc.utexas.edu/)}, month = {sep}, abstract = {The Fishes of Texas Project (www.fishesoftexas.org) compiled Texas fish species occurrence records from 42 museum collections and applied rigorous quality control and data normalization/standardization to result in 124,415 specimen-based records collected between 1851 and 2010 by 5,924 collectors. Though Gulf of Mexico and estuarine records are included, manual georeferencing of localities focused primarily on inland (freshwater) Texas records, resulting in 88,348 records from 7,868 unique Texas inland localities, all with estimates of placement error. Though not all georeferenced, 8,460 marine (Gulf of Mexico) and 18,923 inland records from neighboring Mexican and U.S. states have been partially processed. All georeferenced records were plotted and 4,107 geographic outliers flagged as potential identification or location errors. Most flagged specimens, and often related original documentation, were examined and identifications corrected or confirmed. Data curation methodology is thoroughly documented in the website, where the dataset can be queried in diverse ways, mapped, and data downloaded. Also online are a large set of high quality fish images, collectors{\textquoteright} field notes, specimen photos, species distribution models derived from the data, accounts of species{\textquoteright} biology and ecology, and digital identification keys. Users can comment on any record and upload images, field notes and other documentation.}, keywords = {Fishes of Texas Project, FoTX}, doi = {10.17603/C3WC70}, url = {http://www.fishesoftexas.org/documentation/}, author = {Hendrickson, Dean A. and Cohen, Adam E.} } @inbook {garcia_de_leon_genetic_2015, title = {Genetic Analysis and Conservation Status of Native Populations of Largemouth Bass in Northeastern Mexico}, booktitle = {Black Bass Diversity: Multidisciplinary Science for Conservation}, volume = {82}, year = {2015}, note = {WOS:000352823400046}, pages = {635{\textendash}657}, publisher = {American Fisheries Society}, organization = {American Fisheries Society}, address = {Bethesda, Maryland, USA}, abstract = {Largemouth Bass Micropterus salmoides ranges naturally in Mexico from the binational Rio Grande basin, including Cuatro Cienegas valley in the state of Coahuila, southward and eastward through two adjacent Gulf Coast drainages, the Rio San Fernando and Rio Soto La Marina in Nuevo Leon and Tamaulipas. Within this range, Florida Bass M. floridanus has been introduced into reservoirs in at least the Rio Grande and Soto La Marina basins. To assess the conservation status of native Mexican bass, we study genetic variability within and among Largemouth Bass populations and the degree of genetic introgression by Florida Bass within them. We sampled numerous localities in Cuatro Cienegas, the San Fernando and Rio Soto La Marina basins, and Vicente Guerrero Reservoir, where Florida Bass was introduced. We examined restriction-fragment polymorphisms within the 12S and 16S ribosomal RNA mitochondrial DNA genes and genotypes at two allozyme and five microsatellite DNA loci. Levels of introgression were quantified by Bayesian assignment testing using the nuclear data. Largemouth Bass specimens possessed generally lower nuclear diversity, but higher mitochondrial diversity, than those of Florida Bass. Populations from Cuatro Cienegas differed from those in the San Fernando and Soto La Marina basins. Nuclear analyses revealed three genetically pure populations in Cuatro Cienegas (Charcos Prietos, Las Playitas, and Canal del Tio Julio), but hybrids in Rio Garabatal and Mojarral Este. Another presumably pure Largemouth Bass population was found in Rio El Tigre of the Soto La Marina drainage. Our results could be explained by geographic barriers, sex-biased dispersion, hybrid disadvantage, or selection for coadapted gene complexes. More extensive surveys are needed to fully assess the conservation status of native Largemouth Bass populations in Mexico. We anticipate that these will reveal additional native diversity. Meanwhile, the remnant native populations delineated herein are important to protect and we advocate that their ranges be managed as genetic conservation areas.}, keywords = {black basses, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, differentiation, fishes, Florida, fresh-water, Hybridization, micropterus-salmoides lacepede, microsatellite null alleles, Northern, Software}, isbn = {978-1-934874-40-0}, url = {https://fisheries.org/shop/54082c}, author = {Garcia De Leon, Francisco J. and Rodriguez-Martinez, Rocio I. and Hendrickson, Dean A.}, editor = {Tringali, M. D. and Long, J. M. and Birdsong, T.W. and Allen, M. S.} } @article {hendrickson_dfcs_2015, title = {DFCs publishing legacy: Transitioning into the digital age with new services for, and request for participation of, Council members}, journal = {F1000Research}, volume = {4}, year = {2015}, month = {dec}, abstract = {Read this work by Hendrickson D, at F1000Research.}, doi = {10.7490/f1000research.1111110.1}, url = {https://f1000research.com/slides/4-1397}, author = {Hendrickson, Dean and Boyer, Kathryn and Boersma, Kate and Pister, Phil} } @mastersthesis {gordon_fluviageny_2015, title = {The fluviageny, a method for analyzing temporal river fragmentation using phylogenetics}, year = {2015}, month = {may}, school = {University of Texas at Austin}, type = {phdThesis}, address = {Austin, Texas, U.S.A.}, abstract = {Phylogenetic trees have historically been used to determine evolutionary relatedness between organisms. In the past few decades, as we{\textquoteright}ve developed increasingly powerful computational algorithms and toolsets for performing analyses using phylogenetic methods, the use of these trees has expanded into other areas, including biodiversity informatics and geoinformatics. This report proposes using phylogenetic methods to create "fluviagenies" - trees that represent the effects of river fragmentation over time caused by damming. Faculty at the Center for Research in Water Resources at the University of Texas worked to develop tools and documentation for automating the creation of river segment codes (a.k.a., "fluvcodes") based on spatiotemporal data. Python was used to generate fluviageny trees from lists of these codes. The resulting trees can be exported into the appropriate data format for use with various phylogenetics programs. The Fishes of Texas Database (fshesoftexas.org), a comprehensive geospatial database of Texas fish occurrences aggregated and normalized from 42 museum collections around the world, was employed to create an example of how this tool might be used to analyze and hypothesize changes in fish populations as a consequence of river fragmentation. Additionally, this paper serves to theorize and analyze past and future potential uses for phylogenetic trees in various other fields of informatics.}, keywords = {Fishes of Texas Project, FoTX}, doi = {10.15781/T2TC9Q}, url = {https://repositories.lib.utexas.edu/handle/2152/32365}, author = {Gordon, Andrew Lloyd} } @article {williams_cold-water_2015, title = {Cold-Water Fishes and Climate Change in North America}, journal = {Reference Module in Earth Science Systems and Environmental Sciences, Elsevier}, year = {2015}, month = {sep}, pages = {1{\textendash}10}, doi = {10.1016/B978-0-12-409548-9.09505-1}, author = {Williams and Daniel J. Isaak and Imhof, J. and Hendrickson, Dean A. and McMillan, J.R.} } @inbook {birdsong_native_2015, title = {Native Black Bass Initiative: Implementing Watershed-Scale Approaches to Conservation of Endemic Black Bass and Other Native Fishes in the Southern United States}, booktitle = {Black Bass Diversity: Multidisciplinary Science for Conservation}, volume = {82}, year = {2015}, note = {WOS:000352823400030}, pages = {363{\textendash}378}, publisher = {Amer Fisheries Soc}, organization = {Amer Fisheries Soc}, address = {Bethesda}, abstract = {Rivers and streams of the southern United States contain more than 1,800 aquatic species, 500 of which are regionally endemic. At present, 34\% of the fish species and 90\% of the mussel species in peril nationwide are found in these systems. Declines in these imperiled species are due to many factors, including hydrologic alteration, degraded water quality, loss of instream and watershed connectivity, physical habitat degradation, and the negative effects of nonindigenous species (e.g., predation on, competition with, and hybridization with native forms). In addition, this situation is exacerbated through human population growth, competing water demands, land-use changes, and other interrelated issues. If unchecked, these issues will likely continue to contribute to the imperilment and loss of native species in the region. Of the nine described species and subspecies of black bass, six are endemic to the southern United States: Guadalupe Bass Micropterus treculii, Shoal Bass M cataractae, Redeye Bass M. coosae, Florida Bass M floridanus, Alabama Bass M henshalli, and Suwannee Bass M notius. In addition, undescribed species and subspecies also exist and all are in need of conservation measures to prevent them from becoming imperiled. In an effort to focus and coordinate actions to support the long-term persistence of endemic black bass populations, local, state, and federal agencies, universities, nongovernmental organizations, and corporations from across the region joined with the National Fish and Wildlife Foundation to form the Native Black Bass Initiative (NBBI). The NBBI provides regional conservation strategies, objectives, and targets to restore and preserve functional processes in those watersheds that support natural habitat conditions and sustainable populations of endemic black bass and other native fishes of the region. Initial actions implemented through the NBBI focus on addressing the conservation needs of Guadalupe Bass in streams of the Edwards Plateau ecoregion of Texas, Redeye Bass in the Savannah River watershed of Georgia and South Carolina, and Shoal Bass populations in the Apalachicola River watershed of Alabama, Florida, and Georgia.}, keywords = {alabama, diversity, reservoir, USA}, isbn = {978-1-934874-40-0}, author = {Birdsong, Timothy W. and Allen, Micheal S. and Claussen, Julie E. and Garrett, Gary P. and Grabowski, Timothy B. and Graham, Jessica and Harris, Fred and Hartzog, Andrew and Hendrickson, Dean and Krause, Richard A. and Leitner, Jean K. and Long, James M. and Metcalf, Christopher K. and Philipp, David P. and Porak, Wesley F. and Robinson, Scott and Sammons, Steven M. and Shaw, Stephanie L. and Slaughter, Joe E. and Tringali, Michael D.}, editor = {Tringali, M. D. and Long, J. M. and Birdsong, T.W. and Allen, M. S.} } @article {labay_can_2015, title = {Can species distribution models aid bioassessment when reference sites are lacking? Tests based on freshwater fishes}, journal = {Environmental Management}, year = {2015}, month = {jun}, abstract = {Recent literature reviews of bioassessment methods raise questions about use of least-impacted reference sites to characterize natural conditions that no longer exist within contemporary landscapes. We explore an alternate approach for bioassessment that uses species site occupancy data from museum archives as input for species distribution models (SDMs) stacked to predict species assemblages of freshwater fishes in Texas. When data for estimating reference conditions are lacking, deviation between richness of contemporary versus modeled species assemblages could provide a means to infer relative biological integrity at appropriate spatial scales. We constructed SDMs for 100 freshwater fish species to compare predicted species assemblages to data on contemporary assemblages acquired by 4 independent surveys that sampled 269 sites. We then compared site-specific observed/predicted ratios of the number of species at sites to scores from a multimetric index of biotic integrity (IBI). Predicted numbers of species were moderately to strongly correlate with the numbers observed by the four surveys. We found significant, though weak, relationships between observed/predicted ratios and IBI scores. SDM-based assessments identified patterns of local assemblage change that were congruent with IBI inferences, however, modeling artifacts that likely contributed to over-prediction of species presence may restrict the stand-alone use of SDM-derived patterns for bioassessment and therefore warrant examination. Our results suggest that when extensive standardized survey data that includes reference sites are lacking, as is commonly the case, SDMs derived from generally much more readily available species site occupancy data could be used to provide a complementary tool for bioassessment.}, keywords = {Fishes of Texas, Fishes of Texas Project, FoTX}, doi = {10.1007/s00267-015-0567-0}, url = {http://link.springer.com/article/10.1007/s00267-015-0567-0}, author = {Labay, Benjamin J. and Hendrickson, Dean A. and Cohen, Adam E. and Bonner, Timothy H. and King, Ryan S. and Kleinsasser, Leroy J. and Linam, Gordon W. and Winemiller, Kirk. O.} } @conference {french_morphological_2015, title = {Morphological divergence in multiple populations of Notropis oxyrhynchus}, year = {2015}, month = {jan}, publisher = {American Fisheries Society}, organization = {American Fisheries Society}, address = {Tyler, Texas}, abstract = {Sharpnose shiner, Notropis oxyrhynchus, was recently listed as federally endangered  Known from the Brazos and Colorado Rivers, but Colorado population believed to be introduced and now extinct  Our species distribution models indicate sufficient habitat for the species to occur in the Colorado (Fig. 3).  Our previous work (Fig. 1) to verify cyprinid museum specimens in the Colorado indicate 5 records of N. oxyrhynchus collected from 1884 to 1955 strongly suggesting nativity of the species (or a morphologically similar form) Visual examination of specimens from the Colorado suggest distinctive morphological (shape) differences compared to Brazos specimens  We hypothesized Colorado population might be a separate or incipient species}, keywords = {Notropis oxyrhynchus}, url = {https://docs.google.com/viewer?a=v\&pid=sites\&srcid=ZGVmYXVsdGRvbWFpbnxmaXNoZXNvZnRleGFzZG9jdW1lbnRhdGlvbnxneDo2NmNkODIxZGU0OTU2MjZj}, author = {French, Connor and Hendrickson, Dean A. and Cohen, Adam E. and Langerhans, R. Brian} } @article {oldfield_parental_2015, title = {Parental care in the Cuatro Ci{\'e}negas cichlid, Herichthys minckleyi (Teleostei: Cichlidae)}, journal = {Hydrobiologia}, volume = {748}, number = {1}, year = {2015}, pages = {233{\textendash}257}, abstract = {Behavioral studies have often examined parental care by measuring phenotypic plasticity of behavior within a species. Phylogenetic studies have compared parental care among species, but only at broad categories (e.g., care vs. no care). Here we provide a detailed account that integrates phylogenetic analysis with quantitative behavioral data to better understand parental care behavior in the Cuatro Ci{\'e}negas cichlid, Herichthys minckleyi. We found that H. minckleyi occurs in a clade of sexually monochromatic or weakly dichromatic monogamous species, but that male and female H. minckleyi have dramatically different reproductive coloration patterns, likely as a result of sexual selection. Furthermore, we found that males are polygynous; large males guard large territories, and smaller males may attempt alternative mating tactics (sneaking). Finally, compared to the closely related monogamous Rio Grande cichlid, H. cyanoguttatus, males of H. minckleyi were present at their nests less often and performed lower rates of aggressive offspring defense, and females compensated for the absence of their mates by performing higher levels of offspring defense. Body color, mating system, and parental care in H. minckleyi appear to have evolved after it colonized Cuatro Ci{\'e}negas, and are likely a result of evolution in an isolated, stable environment.}, keywords = {Coahuila, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, Herichthys minckleyi, MEXICO}, issn = {0018-8158}, doi = {10.1007/s10750-014-2081-4}, url = {http://link.springer.com/article/10.1007/s10750-014-2081-4}, author = {Oldfield, Ronald G. and Mandrekar, Kapil and Nieves, Xavier and Hendrickson, Dean A. and Chakrabarty, Prosanta and Swanson, Brook O. and Hofmann, Hans A.} } @conference {hendrickson_applying_2014, title = {Applying Fishes of Texas Project Data for Biodiversity Conservation}, booktitle = {Proceedings of 2014 Annual Meeting of the Texas Chapter of the American Fisheries Society}, year = {2014}, publisher = {Texas Chapter American Fisheries Society}, organization = {Texas Chapter American Fisheries Society}, address = {Pottsboro, Texas, USA}, url = {https://units.fisheries.org/tx/tc-meetings/2014-meeting-home-page/}, author = {Hendrickson, Dean~A. and Cohen, Adam E. and Labay, Benjamin J. and Garrett, Gary P. and Birdsong, Timothy W.} } @conference {dugan_invasion_2014, title = {Invasion risk of a popular aquarium trade fish in an endemic hotspot}, booktitle = {Program and Abstracts, Ecological Society of American}, year = {2014}, month = {aug}, pages = {COS 119{\textendash}9}, publisher = {Ecological Society of America}, organization = {Ecological Society of America}, address = {Sacramento, California, U.S.A.}, abstract = {Background/Question/Methods Invasive species are commonly cited as one of the top threats to global biodiversity. The IUCN Red List database indicated that invasives are contributing threats 292 extinct, extinct in the wild, critically endangered or endangered fishes. The aquarium trade is one of five main pathways by which aquatic species are introduced to a new location. Hemichromis guttatus, a popular ornamental cichlid native to West Africa, is one of these species having been introduced into an endemic hotspot in northern Mexico, the desert spring system Cuatro Cienegas, where it has established, is spreading and is in the process of becoming invasive. This site provides the opportunity to study an invasion in progress and to make predictions about to where H. guttatus may spread, and then to test these predictions. In this work, we asked what is the invasion risk of currently uninhabited sites within Cuatro Cienegas? To do this, we conducted a valley-wide survey of H. guttatus and collected data on the environmental characteristics at each trap site. We then used logistic regression to model which environmental characteristics were related to presence of the exotic and used these results to assign invasion risk to as-of-yet uninhabited sites throughout the valley. Results/Conclusions We found that the model that best predicted Hemichromis guttatus presence included pH, temperature2 (indicating a non-linear relationship between temperature and presence), depth and vegetation presence. However, only pH, temperature2 and vegetation presence were significant predictors, indicating a threshold level of depth below which presence is much more probable, yet under which, there is no clear pattern between depth and the probability of presence. Using these results, we were able to identify sites with a very high, high, moderate and low invasion risk in the valley. Generally, invasion risk declined as sites were further away from thermal spring inputs i.e., downstream in the large river system, and higher closer to these sites. Some sites with a high risk of invasion have surface connections to known presences of H. guttatus while others with a high invasion risk are more isolated, thus dispersal limitation could interact with the environmental characteristics of a site to slow unaided invasion into these more isolated sites. These results will be beneficial to reserve managers in terms of deciding how to prioritize where to use the limited resources available to them to combat the spread of H. guttatus in the valley.}, url = {https://eco.confex.com/eco/2014/webprogram/Paper49288.html}, author = {Dugan, Laura E. and Hendrickson, Dean A. and Parmesan, Camille} } @article {cohen_population_2014, title = {Population of variable platyfish (Xiphophorus variatus) established in Waller Creek, Travis County, Texas}, journal = {The Southwestern Naturalist}, volume = {59}, number = {3}, year = {2014}, month = {sep}, pages = {413{\textendash}419}, abstract = {Abstract The variable platyfish (Xiphophorus variatus), native to Gulf Coast drainages of northern Mexico, is a popular aquarium fish with a long history of introduction globally. We document the first Texas occurrence of this species, and its persistence in highly urban Waller Creek in the city of Austin since at least 2004. The population appears to be limited to Waller Creek, having not yet been found in neighboring creeks where similar habitat exists. We observed individuals in situ and in the lab surviving in 7{\textdegree}C water, well below published thermal minima, and report its persistence through one of the coldest winters in Austin{\textquoteright}s recorded history. Its persistence may be due to a combination of its cold tolerance and the presence of thermal refuges. In the lab we found that individuals purchased in a local pet store and individuals from Waller Creek had the same cold tolerance. , Resumen El pez espada de Valles (Xiphophorus variatus), nativo de las cuencas afluentes del golfo de M{\'e}xico del norte de M{\'e}xico, es una especie popular de acuario con una historia larga de introducciones globales. Aqu{\'\i} documentamos la primera ocurrencia de la especie en Texas y su persistencia en un arroyo urbano, Waller Creek en la ciudad de Austin, a partir de por lo menos 2004. La poblaci{\'o}n parece limitada a Waller Creek porque a{\'u}n no se ha encontrado en arroyos cercanos con h{\'a}bitat similar. Observamos individuos in situ y en el laboratorio sobreviviendo en agua de 7{\textdegree}C, mucho m{\'a}s frio que la m{\'\i}nima tolerancia termal publicada, y reportamos su persistencia a trav{\'e}s de uno de los inviernos m{\'a}s fr{\'\i}os en la historia de Austin. Su persistencia puede ser atribuida a una combinaci{\'o}n de su tolerancia al fr{\'\i}o y existencia de refugios termales. En el laboratorio, individuos comprados en una tienda local de acuario e individuos de Waller Creek mostraron la misma tolerancia al fr{\'\i}o.}, issn = {0038-4909}, doi = {10.1894/MP-10.1}, url = {http://www.bioone.org/doi/abs/10.1894/MP-10.1}, author = {Cohen, Adam E. and Dugan, Laura E. and Hendrickson, Dean A. and Martin, F. Douglas and Huynh, Jonathan and Labay, Ben J. and Casarez, Melissa J.} } @article {garcia_de_leon_francisco_foraging_2014, title = {Foraging patterns of four sympatric species of silversides (Atheriniformes: Atherinopsidae) in Lago de P{\'a}tzcuaro, Central Mexico}, journal = {Cuadernos de Investigaci{\'o}n UNED}, volume = {6}, number = {1}, year = {2014}, pages = {127{\textendash}139}, abstract = {Since Barbour proposed sympatric speciation to explain evolution of silversides in the Lerma-Santiago basin, relatively little subsequent study has been done. We assessed foraging patterns of four sympatric silversides species (Chirostoma estor, Chirostoma grandocule, Chirostoma attenuatum and Chirostoma patzcuaro) in Lago de P{\'a}tzcuaro to understand resource partitioning and their sympatric coexistence. We assessed the abundance of invertebrate prey in three feeding habitats and measured physical and chemical habitat parameters at two study sites. Fish were collected during the wet (September 1987) and dry (March 1988) seasons; a total of 242 gut contents were analyzed. We evaluated the trophic guild of each species using the index of relative importance (IRI), prey selectivity with the Ivlev Electivity Index (E), dietary diversity using Shannon and Wiener diversity index (H{\textquoteright}), and diet overlap using Morisita index. All silverside species were determined to be predaceous carnivores that feed mainly on nekton and periphyton. Dietary diversity and prey selectivity patterns were similar among species and diet overlap was \textgreater70\%. Our data do not support the proposition that coexistence of these four fish species is maintained by dietary specialization. We hypothesize that sympatric coexistence of atherinopsids in Lago de P{\'a}tzcuaro is explained by food resource availability and ontogenetic variation in their diets. This study highlights the importance of analyzing ecological patterns and mechanisms as basic elements for designing conservation strategies of species flocks, especially under habitat loss and introduction of exotic species. Conservation efforts are urgent to preserve the rare evolutionary process of sympatric speciation (habitat segregation) that is occurring in other lakes in central Mexico, and probably already lost in the Lago de P{\'a}tzcuaro, as a result of poor management and inadequate conservation strategies.}, issn = {1659-4266}, url = {http://investiga.uned.ac.cr/revistas/index.php/cuadernos/article/view/312}, author = {Garc{\'\i}a de Le{\'o}n, Francisco and Ram{\'\i}rez-Herrejon,Juan P. and Garc{\'\i}a-Ortega,Rafael and Hendrickson, Dean A.} } @booklet {cohen_final_2014, title = {Final Report: Verification of Identifications of Cyprinid Specimens from the Colorado River Basin, Texas}, number = {FWS FBMS Agreement \#: F12AP00622}, year = {2014}, pages = {1{\textendash}16}, publisher = {University of Texas at Austin}, address = {Austin, Texas}, abstract = {Numerous published reports indicate that records of occurrence of Sharpnose Shiner, Notropis oxyrhynchus, in the Colorado River basin of Texas are the result of an introduction, though the species is clearly native in the adjacent Brazos River basin. We discovered previously mis-identified specimens of N. oxyrhynchus that extend the record of presence of the species in the Colorado basin much further back in time than previous authors realized, and conclude that the species was almost certainly native there. However, lack of the species in any of the many collections made in the basin over the last half century indicates a low probability that it still persists there.}, url = {http://hdl.handle.net/2152/24627}, author = {Cohen, Adam E. and Hendrickson, Dean A. and Martin, F. Douglas} } @booklet {hendrickson_final_2014, title = {Final Report: Conservation assessment and mapping products for GPLCC priority fish taxa}, number = {F13AP01015}, year = {2014}, pages = {1{\textendash}43}, publisher = {University of Texas at Austin}, type = {Final Contract Report to U.S. Fish and Wildlife Service, Great Plains Landscape Conservation Cooperative}, address = {Austin, TX}, abstract = {Strategic conservation planning for broad, multi-species landscapes benefits from a data-driven approach that emphasizes persistence of all priority species populations and utilized landscapes, while simultaneously accounting for human uses. This study presents such an assessment for priority fishes of the Great Plains of the United States. Species distribution models for 28 priority fishes were created and incorporated into a prioritization framework using the open source software Zonation, accounting for species-specific connectivity needs and current fish habitat condition. Multiple additional assessments were then produced that i.) identify distinct species management units based on distance and compositional similarity of stream segments containing priority species, ii.) compare results of ranking species{\textquoteright} conservation values at the local (state) and global scale, and iii.) provide {\textquoteright}bang-for-buck{\textquoteright} perspectives, emphasizing richness of priority species, at state and major basin scales. Together, these analyses are intended to aid managers in effective allocation of conservation action with regards to imperiled fishes of the Great Plains. Implementation of a broad-scale multi-species approach such as this complements traditional reactive management and restoration by encouraging cooperation and coordination among stakeholders and partners, increasing efficiency of future monitoring and management efforts.}, keywords = {Chrosomus erythrogaster, Colorado, Conservation assessment, Conservation planning, Etheostoma cragini, Fish, Fishes of Texas Project, Fundulus kansae, Fundulus sciadicus, GPLCC, Great Plains, Great Plains Landscape Conservation Cooperative, Hybognathus argyritis, Hybognathus hankinsoni, Hybognathus placitus, Kansas, Lepisosteus platostomus, Luxilus cardinalis, Luxilus cornutus, Macrhybopsis australis, Macrhybopsis gelida, Macrhybopsis hyostoma, Macrhybopsis tetranema, MAXENT, Moxostoma carinatum, Nebraska, New Mexico, Nocomis biguttatus, Notropis atherinoides, Notropis blennius, Notropis buccula, Notropis girardi, Notropis heterolepis, Notropis oxyrhynchus, Notropis potteri, Notropis topeka, Noturus placidus, Oklahoma, Phenacobius mirabilis, Pimephales tenellus, Platygobio gracilis, South Dakota, species distribution model, Texas, Wyoming, Zonation}, url = {http://hdl.handle.net/2152/27744}, author = {Hendrickson, Dean A. and Labay, Ben J.} } @article {hendrickson_fishes_2013-1, title = {Fishes of Texas project: compilation, normalization and quality control of museum data [v1; not peer reviewed] poster}, journal = {F1000Research}, volume = {4:1172}, year = {2013}, abstract = {The Fishes of Texas Project (www.fishesoftexas.org) compiled Texas fish species occurrence records from 42 museum collections and applied rigorous quality control and data normalization / standardization to result in 124,415 specimen-based records collected between 1851 and 2010 by 5,924 collectors. 88,348 records from 7,868 unique Texas inland localities were manually georeferenced with placement error estimates. 8,460 Gulf of Mexico records and 18,923 inland records from neighboring Mexican and U.S. states have been partially processed. Georeferenced records were plotted and 4,107 geographic outliers flagged as potential identification or location errors. Most flagged specimens, and often related original documentation, have now been examined and identifications corrected or confirmed. The value of such specimen-based vouchering of collections and compiling and normalizing large data sets was quickly demonstrated by discovery of 35 species occurrences in major river basins where they were previously not believed to occur. The online database can be queried in diverse ways, mapped, and records downloaded. Also online are a large set of high quality fish images, original field notes, specimen photos, detailed species distribution models based on the data, accounts of species{\textquoteright} biology and ecology, video time-lapse distribution maps, and digital identification keys.}, keywords = {Fishes of Texas Project}, doi = {10.7490/f1000research.1110899.1}, author = {Hendrickson, Dean A. and Cohen, Adam E. and Labay, Benjamin J.} } @article {martin_apparent_2013, title = {Apparent Persistence of a Landlocked Population of Gulf Pipefish, Syngnathus scovelli}, journal = {The Southwestern Naturalist}, volume = {58}, number = {3}, year = {2013}, month = {sep}, pages = {376{\textendash}378}, issn = {0038-4909}, doi = {10.1894/0038-4909-58.3.376}, url = {http://www.bioone.org/doi/abs/10.1894/0038-4909-58.3.376}, author = {Martin, F. Douglas and Cohen, Adam E. and Labay, Ben J. and Casarez, Melissa J. and Hendrickson, Dean A.} } @booklet {labay_final_2013, title = {Final Report: Data compilation, distribution models, conservation planning, and status survey for selected fishes of concern in Texas and region}, number = {Texas Parks and Wildlife Section 6 grant TX E-136-R, TPWD \#416853}, year = {2013}, pages = {1{\textendash}70}, publisher = {University of Texas at Austin}, address = {Austin, Texas}, abstract = {The four primary objectives of this project were to: (1) compile a dataset of georeferenced range-wide occurrence records for 6 target fish species (Notropis buccula, N. oxyrhynchus, N. girardi, Hybognathus amarus, Platygobio gracilis, Macrhybopsis tetranema, Pteronotropis hubbsi, and Percina maculata); (2) use a high quality and geographically wide-ranging subset of those data to create species distribution models (SDM{\textquoteright}s), which convert point occurrences into a continuous probability coverage; (3) use those models in conjunction with 130 additional SDM{\textquoteright}s (previously created) to develop modeled conservation priority areas for Texas; and (4) complete a status survey for N. oxyrhynchus and N. buccula in the mainstem of the middle Brazos River. The dataset provided, derived from 51 original sources, includes 11,082 records, of which we were able to georeference 3,675 (33\%). This number of records was sufficient for constructing SDM{\textquoteright}s for the six target species, with all models meeting quality assurance criteria. Using these models, conservation area prioritizations were developed for Texas under several guiding criteria for decision making. The field survey sampled the mainstem Brazos at 20 sites between Possum Kingdom Reservoir and Bryan, TX, collecting 65,840 fish specimens representing 46 species. Neither survey target species was collected, suggesting absence or extreme rarity of both in this reach of the Brazos at the time of sampling. Collection sites upstream of Waco, compared to those downstream of that city, were less diverse in cyprinids and more diverse in non-native species, suggesting more heavily impacted habitat upstream of Waco. All raw data used in analyses and results of analyses and the field survey are provided with the written report.}, url = {http://hdl.handle.net/2152/21837}, author = {Labay, Ben J. and Cohen, Adam E. and Hendrickson, Dean A. and Sissel, Blake and Sarkar, Sahotra and Casarez, Melissa} } @booklet {cohen_final_2013, title = {Final Report: Data provision and projected impact of climate change on fish biodiversity within the Desert LCC. Submitted to United States Department of the Interior, Bureau of Reclamation, Desert Landscape Conservation Cooperative; Agreement Number: R11A}, year = {2013}, month = {nov}, pages = {1{\textendash}109}, publisher = {University of Texas at Austin}, address = {Austin, Texas}, abstract = {The four primary objectives of this project were to: (1) compile a dataset of fish occurrence records for the entirety of the Rio Grande drainage in the US and Mexico; (2) improve that dataset by reformatting dates, synonymizing species names to a modern taxonomy, georeferencing localities, and flagging geographic outliers; (3) for those species with enough data sufficient for modeling, create species distribution models (SDM{\textquoteright}s); (4), use the environmental conditions determined via those models to project the species distributions into the future under two climate scenarios. We compiled 495,101 fish occurrence records mined from 84 original sources into a single database. We then, on the basis of text string searches of the original sources{\textquoteright} verbatim locality fields, indicating a reasonable likelihood of being from the Rio Grande drainage, extracted 145,426 records for which we edited taxonomy, reformatted dates, and finally georeferenced 59,156 (41\%) records that proved sufficient for constructing SDM{\textquoteright}s for 36 species that met a priori quality assurance criteria. We provide basic interpretation of these models and discuss projections of them into several different future climate forecasts. Products include raw model outputs and symbolized maps helpful in interpretation and comparison, as well as raw data sets and recommendations regarding how all of these product might be used in future management efforts.}, url = {http://hdl.handle.net/2152/22475}, author = {Cohen, Adam E. and Labay, Ben J. and Hendrickson, Dean A. and Casarez, Melissa and Sarkar, Sahotra} } @article {oldfield_arginine_2013, title = {Arginine Vasotocin and Androgen Pathways are Associated with Mating System Variation in North American Cichlid Fishes}, journal = {Hormones and Behavior}, year = {2013}, abstract = {Abstract Neuroendocrine pathways that regulate social behavior are remarkably conserved across divergent taxa. The neuropeptides arginine vasotocin/vasopressin (AVT/AVP) and their receptor V1a mediate aggression, space use, and mating behavior in male vertebrates. The hormone prolactin (PRL) also regulates social behavior across species, most notably paternal behavior. Both hormone systems may be involved in the evolution of monogamous mating systems. We compared AVT, AVT receptor V1a2, PRL, and PRL receptor PRLR1 gene expression in the brains as well as circulating androgen concentrations of free-living reproductively active males of two closely related North American cichlid species, the monogamous Herichthys cyanoguttatus and the polygynous H. minckleyi. We found that H. cyanoguttatus males bond with a single female and together they cooperatively defend a small territory in which they reproduce. In H. minckleyi, a small number of large males defend large territories in which they mate with several females. Levels of V1a2 mRNA were higher in the hypothalamus of H. minckleyi, and PRLR1 expression was higher in the hypothalamus and telencephalon of H. minckleyi. 11-ketotestosterone levels were higher in H. minckleyi, while testosterone levels were higher in H. cyanoguttatus. Our results indicate that a highly active AVT/V1a2 circuit(s) in the brain is associated with space use and social dominance and that pair bonding is mediated either by a different, less active AVT/V1a2 circuit or by another neuroendocrine system.}, keywords = {AVP, AVT, Coahuila, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, Herichthys, MEXICO, monogamy, polygamy, prolactin, vasopressin}, issn = {0018-506X}, doi = {10.1016/j.yhbeh.2013.04.006}, url = {http://www.sciencedirect.com/science/article/pii/S0018506X13000949}, author = {Oldfield, Ronald G. and Harris, Rayna M. and Hendrickson, Dean A. and Hofmann, Hans A.} } @booklet {hendrickson_fishes_2013, title = {Fishes of Texas Project and Online Database (http://www.fishesoftexas.org)}, journal = {Fishes of Texas Project and Online Database (http://www.fishesoftexas.org)}, year = {2013}, type = {online database}, abstract = {The Fishes of Texas Project (www.fishesoftexas.org) compiled Texas fish species occurrence records from 42 museum collections and applied rigorous quality control and data normalization/standardization to result in 124,415 specimen-based records collected between 1851 and 2010 by 5,924 collectors. 88,348 records from 7,868 unique Texas inland localities were manually georeferenced with placement error estimates. 8,460 Gulf of Mexico records and 18,923 inland records from neighboring Mexican and U.S. states have been partially processed. Georeferenced records were plotted and 4,107 geographic outliers flagged as potential identification or location errors. Most flagged specimens, and often related original documentation, have now been examined and identifications corrected or confirmed. The value of such specimen-based vouchering of collections and compiling and normalizing large data sets was quickly demonstrated by discovery of 31 species occurrences in major river basins where they were previously not believed to occur. The online database can be queried in diverse ways, mapped, and records downloaded. Also online are a large set of high quality fish images, original field notes, specimen photos, detailed species distribution models based on the data, accounts of species{\textquoteright} biology and ecology, video time-lapse distribution maps, and digital identification keys.}, url = {http://www.fishesoftexas.org}, author = {Hendrickson, Dean A. and Cohen, Adam E.} } @booklet {labay_fishes_2012, title = {Fishes of Texas Project Class 01 Species Distributions Models (http://www.fishesoftexas.org/models)}, journal = {Fishes of Texas Project and Online Database (http://www.fishesoftexas.org}, year = {2012}, type = {online database}, abstract = {Development of species distribution models (SDMs) and application of them has been expanding very rapidly over the past few years. Often based on simple occurrence data like that provided by the Fishes of Texas project, they summarize and make these data sets useful in new ways and across large spatial extents. They have proven useful in diverse applications such as conservation planning, climate change studies, disease ecology, invasive species research, and community ecology. As a first step toward many future landscape-scale geospatial analyses using Fishes of Texas data, we developed powerful predictive computer models of species{\textquoteright} distributions using commonly accepted practices and modeling algorithms and provide them here so that others may use them in their own research and applications. Our models provide continuous coverages of probabilities of species occurrences across all cells of a fine-scale grid extending across all of Texas, thus effectively {\textquotedblleft}filling in the blanks{\textquotedblright} between the actual occurrences that we know to be distributed in non-random ways as a result of diverse historic factors such as collectors{\textquoteright} interests, gears, landowner permission, etc. We developed these models using only the most precisely located recent occurrence records in the Fishes of Texas database together with recent climate and physical environmental data. These models have now been thoroughly tested and demonstrated to be powerful predictors of actual occurrences under current conditions. They were constructed in such a way that the probability values in the models can be interpreted as indicators of suitability of habitat that are mostly independent of large scale land and water development influences such as diversions or dams. Mapped modeled probabilities of species occurrences can be viewed and model outputs formatted for analysis may be downloaded via the model class table below. At this time only Model Class 01 are available for download. When using models, please cite as suggested in the How to cite models section of the Fishes of Texas documentation.}, url = {http://www.fishesoftexas.org/models}, author = {Labay, Benjamin J. and Hendrickson, Dean A. and Cohen, Adam E.} } @inbook {burroughs_morphological_2012, title = {Morphological Variation in the Carapace and Plastron of Terrapene coahuila Schmidt and Owens, 1944}, booktitle = {Morphology and Evolution of Turtles: Origin and Early Diversification}, series = {Vertebrate Paleobiology and Paleoanthropology}, year = {2012}, pages = {535{\textendash}566}, publisher = {Springer}, organization = {Springer}, address = {Dordrecht}, abstract = {Terrapene coahuila is one of four extant species of North American box turtles. It is restricted in distribution to the Cuatro Ci{\'e}negas Basin in Coahuila, M{\'e}xico. Results of previous examinations of extant T. carolina and T. ornata revealed relatively high levels of morphological variation, but morphological studies of T. coahuila are rare, and data on skeletal morphology are limited. We examined 214 skeletal specimens of T. coahuila and documented variation in 51 mensurative and discrete characters of the carapace and plastron. Overall levels of variation are low, as predicted by previously documented levels of gene flow between the sub-populations of the species. However, significant polymorphism is present in the positions of the anterior and posterior sulci of the fourth vertebral scute and the configuration of neural bones 2, 3, and 7. Additionally, co-ossification of the carapacial bones varies substantially within the sample, but independently of carapace length. Genetic, epigenetic, and environmental controls for those features are not known. In addition to documenting skeletal morphology within T. coahuila, we provide new perspectives on patterns of variation within Terrapene, and contribute data that should help paleontologists to establish more rigorous criteria for the identification of fossil specimens of North American box turtles. Those data will be especially important for critical evaluation of recently discovered early and middle Tertiary fossils that are yielding new insights into the evolution of box turtles and the modernization of the turtle biota.}, keywords = {Coahuila, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, MEXICO}, isbn = {978-94-007-4308-3}, doi = {10.1007/978-94-007-4309-0_28}, url = {http://www.springerlink.com/content/n740p330j845443g/}, author = {Burroughs, Robert W. and Bell, Christopher J. and LaDuc, Travis J. and Hendrickson, Dean A.}, editor = {Brinkman, D.B. and Holroyd, P.A. and Gardner, J.D.} } @article {martin_using_2012, title = {Using the Fishes of Texas Project databases and recent collections to detect range expansions by four fish species on the lower coastal plain of Texas}, journal = {Gulf and Caribbean Research}, volume = {24}, year = {2012}, pages = {63{\textendash}72}, author = {Martin, F. Douglas and Cohen, Adam E. and Hendrickson, Dean A.} } @article {varela-romero_status_2011, title = {Status of the Yaqui Catfish (Ictalurus pricei) in the United States and Northwestern Mexico}, journal = {The Southwestern Naturalist}, volume = {56}, number = {2}, year = {2011}, pages = {277{\textendash}285}, abstract = {To appraise conservation status of the Yaqui catfish Ictalurus pricei, we reviewed literature and unpublished records on a captive stock, examined voucher specimens at museums, re-sampled historical localities in the Yaqui, Mayo, and Fuerte river basins, and we surveyed rivers further south. A total of 72 specimens of native Ictalurus was collected in the Yaqui, Fuerte, Sinaloa, Culiac{\'a}n, and San Lorenzo river basins. No native Ictalurus was collected in the Mayo Basin. Distribution of the Yaqui catfish appears restricted to the Yaqui, Mayo and Fuerte river basins, all of which now harbor nonnative blue (I. furcatus) and channel (I. punctatus) catfishes. The nonnative black bullhead (Ameiurus melas) is now known from the Yaqui Basin and the flathead catfish (Pylodictis olivaris) has been recorded anecdotally in the Yaqui Basin. Threats to the Yaqui catfish have increased in recent years and hybridization with the channel catfish now appears widespread. We conclude that the Yaqui catfish should be considered endangered throughout its range and that status of native populations of Ictalurus in the United States and Mexico should be reviewed and management intensified. Para evaluar el estatus de conservaci{\'o}n del bagre de Yaqui Ictalurus pricei, revisamos la literatura y registros no publicados de una l{\'\i}nea cautiva, examinamos ejemplares de referencia de museos, muestreamos nuevamente las localidades hist{\'o}ricas en las cuencas de los r{\'\i}os Yaqui, Mayo, y Fuerte y muestreamos los r{\'\i}os m{\'a}s al sur. Recolectamos un total de 72 ejemplares de Ictalurus nativos en las cuencas de los r{\'\i}os Yaqui, Fuerte, Sinaloa, Culiac{\'a}n, y San Lorenzo. No recolectamos ejemplares de Ictalurus nativos en la cuenca del Mayo. La distribuci{\'o}n del bagre de Yaqui parece estar restringida a las cuencas de los r{\'\i}os Yaqui, Mayo, y Fuerte, las cuales albergan actualmente los bagres no-nativos I. furcatus y I. punctatus. El bagre no-nativo Ameiurus melas se conoce para la cuenca del Yaqui y el bagre Pylodictis olivaris se registra anecd{\'o}ticamente para la cuenca del Yaqui. Las amenazas para el bagre Yaqui se han incrementado en a{\~n}os recientes y la hibridaci{\'o}n con I. punctatus se ha extendido. Concluimos que el bagre de Yaqui deber{\'a} considerarse como en peligro de extinci{\'o}n a lo largo de su distribuci{\'o}n y que el estatus de las poblaciones remanentes de Ictalurus en los Estados Unidos y M{\'e}xico deber{\'a} revisarse e intensificar su manejo.}, issn = {0038-4909}, url = {https://www.jstor.org/stable/23028181}, author = {Varela-Romero, Alejandro and Hendrickson, Dean A. and Yepiz-Plascencia, Gloria and Brooks, James E. and Neely, David A.} } @article {marks_coupling_2011, title = {Coupling stable isotope studies with food web manipulations to predict the effects of exotic fish: lessons from Cuatro Ci{\'e}negas, Mexico}, journal = {Aquatic Conservation: Marine and Freshwater Ecosystems}, volume = {21}, number = {4}, year = {2011}, month = {jun}, pages = {317{\textendash}323}, abstract = {1. Exotic species threaten native species worldwide, but their impacts are difficult to predict. 2. Stable isotope analysis was combined with field competition experiments to predict how an invasive African cichlid fish, Hemichromis guttatus, might affect native fish in the desert springs of Cuatro Ci{\'e}negas, Mexico. 3. Stable isotope analysis suggested diet overlap between the invader and juvenile endemic cichlids, and field experiments verified that the invader reduces growth rates of the juvenile endemics through competition, but has smaller effects on adults. 4. Competition between juvenile endemic cichlids and the invader was asymmetric, with the exotic out-competing the native, suggesting the potential for competitive exclusion if the invasion is not stopped. 5. These results suggest that exotic removal programmes in Cuatro Ci{\'e}negas should focus on removing/reducing populations of the exotic cichlid in habitats where juvenile native cichlids are concentrated. 6. This approach could help focus efforts to manage exotic species before populations of native species have crashed, when it is too late to intervene. Copyright {\textcopyright} 2011 John Wiley \& Sons, Ltd.}, keywords = {competition, exotic species, food webs, management, stable isotopes}, issn = {1099-0755}, doi = {10.1002/aqc.1199}, url = {http://onlinelibrary.wiley.com/doi/abs/10.1002/aqc.1199}, author = {Marks, Jane C. and Williamson, Christopher and Hendrickson, Dean A.} } @article {hendrickson_review_2011, title = {Review of: Inland Fishes of the Greater Southwest: Chronicle of a Vanishing Biota. By W. L. Minckley and Paul C. Marsh; Foreword by, James E. Deacon. Tucson (Arizona): University of Arizona Press. \$75.00. xxxv + 426 p. + 47 pl.; ill.; species and subject}, journal = {The Quarterly Review of Biology}, volume = {86}, number = {3}, year = {2011}, month = {sep}, pages = {237{\textendash}237}, abstract = {Full text here: "This important book is basically about fishes of Arizona and very small areas of adjacent U.S. states, as well as all of the Mexican states of Baja California (North and South) and Sonora, and a very small piece of westernmost Chihuahua. After a short introduction (five pages), the first 17 pages of Chapter 2 provide background on topography, as well as geologic, climatologic, and vegetation history relevant to ecology and evolution of the natural aquatic ecosystems of a much broader region{\textemdash}all major North American deserts. The next 24 pages are an overview of the extensive recent human alterations of aquatic systems in the hydrologically defined focal area. Conservation issues are mentioned in Chapter 2, but Chapter 3 focuses on that and although short (4.5 pages), it is anything but sweet, strongly criticizing the political system and management agencies for failure to apply sound science and allowing the long, continual decline of native fishes to go unchecked. Chapter 4 (203 pages) contains brief guides to anatomy and identification, family and species keys, and very well-done, comprehensive species accounts for 173 species (75 native, including four undescribed). Content covering northwest Mexico is noticeably lighter than for Arizona. All species ever recorded are included, whether or not they have self-sustaining populations. A very strong point is the book{\textquoteright}s comprehensive (72 pages) Literature Cited section, including substantial {\textquotedblleft}gray{\textquotedblright} literature that previously had been underutilized and hard to find. I would have liked to have seen more citation of {\textquotedblleft}raw{\textquotedblright} data (e.g., museum catalog numbers for key records) and was a bit surprised to see illustrations ranging from many very simple line drawings (little more than outlines) through occasional black-and-white photographs, but there are also many higher quality line drawings with greater detail and 47 nice color plate illustrations. Dot and shaded maps are provided for native species only. I found very few errors, all minor, and overall found this to be an authoritative and valuable contribution on this important and very much imperiled fauna and the complex issues that imperil it."}, issn = {0033-5770, 1539-7718}, doi = {10.1086/661147}, url = {http://www.journals.uchicago.edu/doi/10.1086/661147}, author = {Hendrickson, Dean~A.} } @book {hendrickson_proceedings_2011-3, title = {Proceedings of the Desert Fishes Council Annual Symposium 2004}, volume = {XXXVI}, year = {2011}, publisher = {Desert Fishes Council}, organization = {Desert Fishes Council}, address = {Bishop, California}, abstract = {The mission of the Desert Fishes Council is to preserve the biological integrity of North America{\textquoteright}s desert aquatic ecosystems and their associated life forms, to hold symposia to report related research and management endeavors, and to effect rapid dissemination of information concerning activities of the Council and its members.}, isbn = {1068-0381}, url = {http://www.desertfishes.org/proceedings/DFC_Vol_XXXVI.pdf}, editor = {Hendrickson, Dean A. and Findley, Lloyd T.} } @book {hendrickson_proceedings_2011-2, title = {Proceedings of the Desert Fishes Council Annual Symposium 2005}, volume = {XXXVII}, year = {2011}, publisher = {Desert Fishes Council}, organization = {Desert Fishes Council}, address = {Bishop, California}, abstract = {The mission of the Desert Fishes Council is to preserve the biological integrity of North America{\textquoteright}s desert aquatic ecosystems and their associated life forms, to hold symposia to report related research and management endeavors, and to effect rapid dissemination of information concerning activities of the Council and its members.}, isbn = {1068-0381}, url = {http://www.desertfishes.org/proceedings/DFC_Vol_XXXVII.pdf}, editor = {Hendrickson, Dean A. and Findley, Lloyd T.} } @book {hendrickson_proceedings_2011-1, title = {Proceedings of the Desert Fishes Council Annual Symposium 2006}, volume = {XXXVIII}, year = {2011}, publisher = {Desert Fishes Council}, organization = {Desert Fishes Council}, address = {Bishop, California}, abstract = {The mission of the Desert Fishes Council is to preserve the biological integrity of North America{\textquoteright}s desert aquatic ecosystems and their associated life forms, to hold symposia to report related research and management endeavors, and to effect rapid dissemination of information concerning activities of the Council and its members.}, isbn = {1068-0381}, url = {http://www.desertfishes.org/proceedings/DFC_Vol_XXXVIII.pdf}, editor = {Hendrickson, Dean A. and Findley, Lloyd T.} } @book {hendrickson_proceedings_2011, title = {Proceedings of the Desert Fishes Council Annual Symposium 2007}, volume = {XXXIX}, year = {2011}, publisher = {Desert Fishes Council}, organization = {Desert Fishes Council}, address = {Bishop, California}, abstract = {The mission of the Desert Fishes Council is to preserve the biological integrity of North America{\textquoteright}s desert aquatic ecosystems and their associated life forms, to hold symposia to report related research and management endeavors, and to effect rapid dissemination of information concerning activities of the Council and its members.}, isbn = {1068-0381}, url = {http://www.desertfishes.org/proceedings/DFC_Vol_XXXIX.pdf}, editor = {Hendrickson, Dean A. and Findley, Lloyd T.} } @article {labay_assessing_2011, title = {Assessing Historical Fish Community Composition Using Surveys, Historical Collection Data, and Species Distribution Models}, journal = {PLoS ONE}, volume = {6}, number = {9}, year = {2011}, pages = {e25145}, issn = {1932-6203}, doi = {10.1371/journal.pone.0025145}, url = {http://dx.plos.org/10.1371/journal.pone.0025145}, author = {Labay, Ben and Cohen, Adam E. and Sissel, Blake and Hendrickson, Dean A. and Martin, F. Douglas and Sarkar, Sahotra}, editor = {Browman, Howard} } @inbook {varela-romero_peces_2010, title = {Peces dulceaqu{\'\i}colas}, booktitle = {Diversidad Biol{\'o}gica de Sonora}, volume = {1st}, year = {2010}, pages = {339{\textendash}356}, publisher = {Universidad Nacional Aut{\'o}noma de M{\'e}xico}, organization = {Universidad Nacional Aut{\'o}noma de M{\'e}xico}, address = {Ciudad Universitaria, D.F., M{\'e}xico}, keywords = {fishes, peces, Sonora}, isbn = {978-607-02{\textendash}427-2}, url = {file://C:\Documents and Settings\dean_h\My Documents\reprints in pdf or other\MASTER8_RM12\40009\Varela\&Hendrickson_2010_Sonoran_freshwater_fishes.pdf}, author = {Varela-Romero, Alejandro and Hendrickson, Dean A.} } @conference {mayden_evolution_2010, title = {Evolution and diversity of trout species in the Sierra Madre Occidental of Mexico}, booktitle = {Conserving wild trout, Proceedings of the Wild Trout X Symposium}, volume = {X}, year = {2010}, month = {sep}, pages = {134{\textendash}144}, address = {Bozeman, Montana, USA}, abstract = {The trout species of Mexico{\textquoteleft}s Sierra Madre Occidental (SMO) range have been essentially ignored in science except for the efforts of Needham and Gard (1959) in the mid-20th century. Even after their work documenting the existence of the Mexican Golden Trout Oncorhynchus chrysogaster no focused efforts to study the diversity in the SMO south of the USA were initiated until 1997. Sampling in the Sierra Madre Occidental is extremely difficult, but our efforts since that year have revealed that all of Mexico{\textquoteleft}s SMO trout are native (except for hatchery-reared) to the R{\'\i}o Yaqui system southward to the R{\'\i}o Acaponeta, and in the R{\'\i}o Conchos drainage. Morphological and genetic studies of the populations from these rivers support the hypothesis of multiple divergent lineages that we argue are distinct evolutionary species. Conservation and protection of these lineages are critical and should constitute a coordinated effort involving governmental agencies, private organizations, nonprofit groups, and individuals. More inventory work is warranted to better understand the distributions of the native trout and efforts should be made to eliminate the introduction of --hatchery rainbow trout{\textbardbl} Oncorhynchus mykiss into grow-out facilities in these mountains, instead replaced with propagation efforts on the different native species within their respective drainages. The diversity of wildlife and natural features across the SMO could, with proper planning and maintenance, serve as a fundamental, environmentally sound, sustainable resource for the region via ecotourism.}, keywords = {Mexican trout}, url = {http://www.wildtroutsymposium.com/proceedings-10.pdf}, author = {Mayden, Richard L. and Dillman, Casey B. and Espinosa-P{\'e}rez, H{\'e}ctor and Tomelleri, Joseph R. and Kuhajda, Bernard R. and Hendrickson, Dean A. and Ru{\'\i}z-Campos, Gorgonio and de los Santos-Camarillo, Ana Belia and Francisco, , Garc{\'\i}a de Le{\'o}n and Varela-Romero, Alejandro and Propst, David L. and Brooks, James E. and Findley, Lloyd T. and George, Anna L. and Neely, David A.} } @article {mcclure-baker_genetic_2010, title = {Genetic Status of Headwater Catfish in Texas and New Mexico: A Perspective from mtDNA and Morphology}, journal = {Transactions of the American Fisheries Society}, volume = {139}, number = {6}, year = {2010}, month = {nov}, pages = {1780{\textendash}1791}, abstract = {Collections of 231 catfish from 34 localities were surveyed for mtDNA (399 base pairs of cytochrome b) and morphological evidence of headwater catfish Ictalurus lupus in areas of historical occurrence in Texas and New Mexico. The species is of concern for conservation managers, primarily because of the potential for population losses from competition and hybridization with channel catfish I. punctatus. For cytochrome b, there were two deeply divergent (4.8{\textendash}6.1\%) groups, a channel catfish clade of 14 haplotypes (0.8\% to 1.3\% divergence) and a headwater catfish clade of two haplotypes (1.0\% divergence), associated with morphotypes of channel catfish and headwater catfish, respectively. Morphotypes were based on field identification and a canonical discriminant function utilizing external morphology. All specimens from the Nueces River and the main-stem Rio Grande and the Pecos River conformed to morphological and mtDNA expectations for channel catfish. Apparently pure populations of headwater catfish were found only in two relatively isolated situations (Rocky Arroyo, New Mexico, and San Solomon Spring, Texas). Additional genetic evidence of headwater catfish was restricted to four populations in streams that are direct tributaries of either the Pecos River or the Rio Grande. Two of these populations (Independence Creek and Dolan Creek{\textemdash}Devils River) were morphologically distinct from, but shifted toward, the morphotype of channel catfish. A third population (Pinto Creek) was morphologically indistinguishable from channel catfish, and individuals from the fourth population (Delaware River) had morphotypes consistent with both species. The Pinto Creek, Independence Creek, and Delaware River populations exhibited mtDNA haplotypes from both species, whereas the Dolan Creek{\textemdash}Devils River population was fixed for a haplotype from the headwater catfish clade. A survey of early collection records tentatively suggests that hybridization between headwater catfish and channel catfish might be a result of relatively recent introduction of the latter to the Rio Grande basin.}, keywords = {Chihuahua catfish, FoTX, Ictalurus chihuahua, Ictalurus lupus, Ictalurus punctatus, TNHC}, issn = {0002-8487}, doi = {10.1577/T10-009.1}, url = {http://dx.doi.org/10.1577/T10-009.1}, author = {McClure-Baker, Sherri A. and Echelle, Anthony A. and van den Bussche, Ronald A. and Echelle, Alice F. and Hendrickson, Dean A. and Garrett, Gary P.} } @booklet {hendrickson_final_2010, title = {Final Report: Provision and Inventory of Diverse Aquatic Ecosystem-related Resources for the Great Plains Landscape Conservation Cooperative (GPLCC)}, number = {20181AG915}, year = {2010}, pages = {111}, publisher = {U.S. Fish and Wildlife Service and University of Texas at Austin}, type = {Grant Agreement}, abstract = {In 2010, the Great Plains LCC funded a project that compiled and standardized more than 76,000 existing data records from natural history museums. Led by Dean Hendrickson, Curator of Ichthyology at the University of Texas Austin, the researchers compiled extensive, high quality data sets on occurrences of fishes, aquatic reptiles and amphibians, freshwater mussels, and cave invertebrates from the Texas, New Mexico, Colorado and Oklahoma portions of the GPLCC region. Much of the wealth of information stored in natural history collections requires substantial investment in order to make it accessible and useful to natural resource managers and researchers. Over 55 percent of the records provided by this project are georeferenced and in a format suitable for immediate use in climate models and conservation planning. {\textquotedblleft}This project provides essential data to our partners throughout the region,{\textquotedblright} says GPLCC Science Coordinator James Broska. {\textquotedblleft}Sharing data and making it easily accessible is a primary function of LCCs.{\textquotedblright} As part of the project, researchers demonstrated how this type of occurrence data can be effectively combined in computer models with various environmental data in ways that greatly facilitate planning at the landscape level. Using fish occurrence data for Texas, they applied it in rigorous modeling, climate change and conservation network planning exercises. The models incorporated recent occurrence records and climate data and were validated to be powerful predictors of actual occurrences under current conditions. The team then replaced the current climate data with predicted future climate data and computed how species{\textquoteright} distributions would shift if those climate predictions were realized. While the demonstration was done statewide for Texas, it used species that occur in, and are of particular interest to, the Great Plains LCC. In the final report, the researchers describe the use of the ConsNet conservation planning program to produce a portfolio of priority area sets for conservation network planning. Initial results from ConsNet used the models described above to integrate a great diversity of biological knowledge, summarizing it into a baseline starting set of priority areas for management actions based strictly on maximization of representation of biodiversity. Managers and policy makers can then continue analysis and prioritization in Consnet, adding additional factors to the biology-based starting scenario, such as habitat impaction and socioeconomic or ecosystem service cost-benefit parameters. ConsNet can easily and interactively produce large numbers of variations based on diverse criteria, thus providing a large variety of alternatives to consider for potential implementation. {\textquotedblleft}This project has begun to compile the basic historic, current and future species occurrence and environmental data sets the Great Plains LCC will need to perform such analyses for its own geographic scope, perhaps applying the same methodologies, data sets and tools we developed and provided in this project,{\textquotedblright} says Hendrickson. {\textquotedblleft}We look forward to continuing our work with the Great Plains LCC to build and improve its data resources and tool set to help address the complex issues it will face as it strives to attain its long-term conservation and sustainability objectives.{\textquotedblright}}, url = {http://hdl.handle.net/2152/20040}, author = {Hendrickson, Dean A. and Sarkar, Sahotra and Molineux, Ann} } @booklet {clippard_troubled_2009, title = {Troubled Waters: A rare desert spring ecosystem considered one of Mexico{\textquoteright}s 13 natural wonders is threatened}, journal = {News from the College of Natural Sciences, University of Texas at Asutin}, year = {2009}, month = {mar}, abstract = {Sprawling across a cactus-studded valley in M{\'e}xico{\textquoteright}s Chihuahuan Desert is a place like no other on the planet. . It{\textquoteright}s called Cuatroci{\'e}negas, and it is a crunchy expanse of land isolated in a basin ringed by mountains like salt on the rim of a margarita glass. The seemingly dry, desert area, however, is best known for its life-giving waters{\textemdash}pools, wetlands and rivers filled to the brim with an amazing assortment of unique species. "This is an incredibly diverse area for this part of the world, with more endemic species per area than the Gal{\'a}pagos Islands," says Dean Hendrickson, curator of ichthyology at the Texas Natural Science Center. But Cuatroci{\'e}negas is not immune to change, and its rare ecosystems are under increasing pressure from climate change, invasive species and agriculture. Hendrickson, who has been visiting the area since 1979, now finds himself working with others to forge a sustainable future for the region. "My vision is to get a big interdisciplinary, international project going and try to find solutions that we can propose to the local community," he says. He has established a permanent research station in town, and he hopes this will encourage more researchers from other fields to begin projects there. "There are very complex issues here that go way beyond simple biology and conservation and get into sociology and economics," he says.}, url = {https://cns.utexas.edu/news/cuatrocienegas}, author = {Clippard, Lee} } @booklet {airhart_troubled_2009, title = {Troubled Waters: Mexican Desert Springs Face Uncertain Future}, journal = {Texas Geosciences}, year = {2009}, month = {jan}, abstract = {Researchers at the University of Texas at Austin are studying the biology and hydrology of Cuatrocienegas, a rare and endangered desert oasis in northern Mexico. Covers research of Dean Hendrickson and Brad Wolaver.}, keywords = {Cuatro Ci{\'e}negas, Cuatroci{\'e}negas}, url = {http://www.jsg.utexas.edu/news/2009/01/troubled-waters-mexican-desert-springs-face-uncertain-future/}, author = {Airhart, Marc} } @article {contreras-balderas_freshwater_2008, title = {Freshwater fishes and water status in M{\'e}xico: A country-wide appraisal.}, journal = {Aquatic Ecosystem Health \& Management}, volume = {11}, number = {3}, year = {2008}, pages = {246{\textendash}256}, abstract = {M{\'e}xico is the southernmost country in North America, and extends into Central America, south of the Isthmus of Tehuantepec. The northern half of M{\'e}xico is located on the Temperate belt and is arid in character (Nearctic), while the rest is within the Tropical belt (Neotropical). Climate varies from extremely temperate desert in the north, to tropical humid in the south. M{\'e}xico has more than 500 freshwater fish species, about 271 of them country endemics, and approximately 48 endemics from binational basins. There are still some 30{\textendash}40 fish species not yet described. There are 563 fish species colonizing coastal flood plain species. In addition to the numbers of colonizing fishes, the burden of introduced exotics has also been growing. In 1904, only 4 species were recognized as exotics; by 1997 the number had increased to 94, and by 2008 to 115. The main fish collections in Mexico are at IPN, UNAM, and UANL and are the most representative, being national in scope, although concentrated in the tropics, central region, and general in coverage, respectively. The decline of the native fish fauna has been in focus in recent years, usually as trend-in-time comparisons, where the loss of native forms and increase of exotics and/or colonizer species is evident in many basins, mainly in R{\'\i}o Balsas, R{\'\i}o Grande, and R{\'\i}o Lerma-Santiago. As a result, the numbers of species reported at some degree of risk have been increasing also, from 17 in 1963 to 192 in 2005. The trends in colonizers, exotics, and species at risk among Mexican fishes are parallel. The Index of Biological Integrity (IBI), in either its geographical, or historical form (IBIh), has been applied to the Rio Grande/R{\'\i}o Bravo basin, USA and M{\'e}xico. IBIh values go between 0{\textendash}91 (average 31). Alien species are regarded as detrimental. Overall, the IBI trends have been similar in all regions, starting from 70{\textendash}95\% in upper reaches, decreasing to less than 0{\textendash}35\% in the lower reaches of West central basins, and then down to 15\% or less near the Lower Rio Grande delta. Several alien species of plecos have been recognized in the rivers Balsas, Grijalva-R{\'\i}o Usumacinta complex, and, also, one in the Rio Grande. Mexican rivers are notoriously dewatered in the northern half of the country. Until 1962, the Rio Grande had an average runoff of 12,000+ millions of cubic meters/year; however by 2002 it was less than 2\% of that value. The river went nearly dry along the Big Bend region and was dry for months in the delta region, both in 2002 and 2004. The Rio Grande is mostly dry north of the R{\'\i}o Conchos junction, its main Mexican tributary, and other tributaries provide now between 1\% (R{\'\i}o San Juan) and 20\% (R{\'\i}o Conchos) of pre-1960 runoff. A modified Index of Biological Integrity for Rio Grande resulted in grades from 70 to 95\% of the baseline in upper reaches, less than 35\% in lower reaches, to less than 15\% near the coast. The Texan version of the IBI was not representative as it suppresses data on euryhaline fishes. The reports of total toxics were masked, since the sum should have included both organics and heavy metals exceeding USA regulations to the total count, but only one of the two was included.}, keywords = {Rios de Mexico}, issn = {1463-4988}, doi = {10.1080/14634980802319986}, url = {http://www.tandfonline.com/doi/abs/10.1080/14634980802319986}, author = {Contreras-Balderas, S. and Ruiz-Campos, G. and Schmitter-Soto, J.J. and Diaz-Pardo, E. and Contreras-McBeath, T. and Medina-Soto, M. and Zambrano-Gonz{\'a}lez, L. and Varela-Romero, A. and Mendoza-Alfaro, R. and Ram{\'\i}rez-Mart{\'\i}nez, C. and Leija-Trist{\'a}n, M. A. and Almada-Villela, P. and Hendrickson, Dean A. and Lyons, J.} } @article {jelks_conservation_2008, title = {Conservation status of imperiled North American freshwater and diadromous fishes}, journal = {Fisheries}, volume = {33}, number = {8}, year = {2008}, pages = {372{\textendash}407}, abstract = {This is the third compilation of imperiled (i.e., endangered, threatened, vulnerable) plus extinct freshwater and diadromous fishes of North America prepared by the American Fisheries Society{\textquoteright}s Endangered Species Committee. Since the last revision in 1989, imperilment of inland fishes has increased substantially. This list includes 700 extant taxa representing 133 genera and 36 families, a 92\% increase over the 364 listed in 1989. The increase reflects the addition of distinct populations, previously non-imperiled fishes, and recently described or discovered taxa. Approximately 39\% of described fish species of the continent are imperiled. There are 230 vulnerable, 190 threatened, and 280 endangered extant taxa, and 61 taxa presumed extinct or extirpated from nature. Of those that were imperiled in 1989, most (89\%) are the same or worse in conservation status; only 6\% have improved in status, and 5\% were delisted for various reasons. Habitat degradation and nonindigenous species are the main threats to at-risk fishes, many of which are restricted to small ranges. Documenting the diversity and status of rare fishes is a critical step in identifying and implementing appropriate actions necessary for their protection and management.}, keywords = {blindcats, Chihuahua catfish, Coahuila, conservation, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, fisheries, fishes, freshwater, Ictalurus pricei, MEXICO, Prietella phreatophila, Satan eurystomus, status, Trogloglanis pattersoni}, doi = {10.1577/1548-8446-33.8.372}, url = {http://www.fisheries.org/afs/docs/fisheries/fisheries_3308.pdf}, author = {Jelks, H.L. and Walsh, S.J. and Burkhead, N.M. and Contreras-Balderas, Salvador and Diaz-Pardo, E. and Hendrickson, Dean A. and Lyons, J. and Mandrak, N.E. and McCormick, F. and Nelson, J.S. and Platania, S.P. and Porter, B.A. and Renaud, C.B. and Schmitter-Soto, J.J. and Taylor, E.B. and Warren, M.L.} } @article {martin_obituary:_2008, title = {Obituary: Clark Hubbs 1921-2008 Ichthyologist.}, journal = {Fisheries}, volume = {33}, number = {6}, year = {2008}, pages = {302}, url = {http://fisheries.org/docs/fisheries_magazine_archive/fisheries_3306.pdf}, author = {Martin, F. Douglas and Edwards, Robert J. and Hendrickson, Dean A. and Garrett, Gary P.} } @article {camarena-rosales_mitochondrial_2008, title = {Mitochondrial haplotype variation in wild trout populations (Teleostei: Salmonidae) from northwestern Mexico}, journal = {Reviews in Fish Biology and Fisheries}, volume = {18}, number = {1}, year = {2008}, pages = {33{\textendash}45}, abstract = {The variation and composition of Mexican wild trout mitochondrial DNA haplotypes throughout northwestern Mexico was determined by means of polymerase chain reaction-restriction fragment polymorphism analysis (PCR-RFLP), of one region of mitochondrial DNA between cytochrome b and the D-loop. This analysis was based on 261 specimens taken in 12 basins and four hatcheries from northwestern Mexico. From 23 haplotypes, 15 wild trout haplotypes were identified and classified in four groups: (1) one restricted to Nelson{\textquoteright}s trout (Oncorhynchus mykiss nelsoni), (2) four restricted to R{\textexclamdown}o Mayo and R{\textexclamdown}oYaqui trout (O. mykiss sspp.), (3) six to Mexican golden trout (O. chrysogaster) with two subgroups, and (4) one exclusive to R{\textexclamdown}o Piaxtla trout. Distributions of native haplotypes broadly overlap the distribution of non-native hatchery rainbow trout reflecting the historical management of introductions of exotic rainbow trout and the artificial transference of these trout among basins.}, keywords = {Chihuahua, Conchos, conservation, cytochrome, Cytochrome b, endangered, Mayo, Mexican trout, Oncorhynchus, Oncorhynchus mykiss, rainbow trout, Salmonidae, Truchas Mexicanas}, url = {⬚d:\users\dean_h\reprints in pdf or other\Camarena_2008_Mt_haplotype_Mexican_trout.pdf⬚}, author = {Camarena-Rosales, Faustino and Ruiz-Campos, Gorgonio and Rosa-V{\'e}lez, Jorge and Mayden, Richard L. and Hendrickson, Dean A. and Varela-Romero, Alejandro and Garc{\'\i}a De Le{\'o}n, Francisco J.} } @article {swanson_variation_2008, title = {Variation in foraging behavior facilitates resource partitioning in a polymorphic cichlid, Herichthys minckleyi}, journal = {Environmental Biology of Fishes}, volume = {Online First}, year = {2008}, abstract = {We examined foraging behavior (microhabitat use and feeding behavior) in a trophically polymorphic cichlid fish, Herichthys minckleyi, to address several questions regarding resource partitioning in this threatened species. These include: (1) do morphotypes demonstrate different foraging behaviors? (2) do individuals within a morphotype vary in their foraging behavior (e.g. are some individuals specialists, only using a subset of available resources, while other are generalists)? (3) do foraging behaviors vary between isolated pools? (4) do foraging behaviors vary across seasons? We quantified microhabitat use and feeding behavior for over 100 individuals (of two morphotypes) feeding freely in two isolated pools (populations) and across two seasons (winter and summer). We found differences in foraging behavior between morphotypes and individual specializations within morphotypes; i.e. some individuals specialize on certain food resources by using a few feeding behaviors within a subset of microhabitats, whereas others employ a range feeding behaviors across many microhabitats. Foraging behavior also varied between pools and across seasons. This spatial and temporal variation in foraging behavior and resource use may serve to maintain this polymorphism, as the relative fitness of the each morph may vary over space and time}, keywords = {Behavior, cichlid, Cichlid fish, Coahuila, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, feeding, FEEDING BEHAVIOR, Fish, fitness, Food resources, foraging behavior, Herichthys, Herichthys minckleyi, individuals, MEXICO, microhabitat, microhabitats, Polymorphism, populations, Resource partitioning, Seasons, specialization, threatened, THREATENED SPECIES, variation}, url = {http://dx.doi.org/10.1007/s10641-007-9307-5}, author = {Swanson, Brook O. and Gibb, Alice C. and Marks, Jane C. and Hendrickson, Dean A.} } @article {howeth_contrasting_2008, title = {Contrasting demographic and genetic estimates of dispersal in the endangered Coahuilan Box Turtle: A contemporary approach to conservation}, journal = {Molecular Ecology}, volume = {17}, number = {19}, year = {2008}, month = {aug}, pages = {4209{\textendash}4221}, abstract = {The evolutionary viability of an endangered species depends upon gene flow among subpopulations and the degree of habitat patch connectivity. Contrasting population connectivity over ecological and evolutionary timescales may provide novel insight into what maintains genetic diversity within threatened species. We employed this integrative approach to evaluating dispersal in the critically endangered Coahuilan box turtle (Terrapene coahuila) that inhabits isolated wetlands in the desert-spring ecosystem of Cuatro Ci{\'e}negas, Mexico. Recent wetland habitat loss has altered the spatial distribution and connectivity of habitat patches; and we therefore predicted that T. coahuila would exhibit limited movement relative to estimates of historic gene flow. To evaluate contemporary dispersal patterns, we employed mark-recapture techniques at both local (wetland complex) and regional (inter-complex) spatial scales. Gene flow estimates were obtained by surveying genetic variation at nine microsatellite loci in seven subpopulations located across the species{\textquoteright} geographic range. The mark-recapture results at the local spatial scale reveal frequent movement among wetlands that was unaffected by inter-wetland distance. At the regional spatial scale, dispersal events were relatively less frequent between wetland complexes. The complementary analysis of population genetic substructure indicates strong historic gene flow (global FST = 0.01). However, a relationship of genetic isolation by distance across the geographic range suggests that dispersal limitation exists at the regional scale. Our approach of contrasting direct and indirect estimates of dispersal at multiple spatial scales in T. coahuila conveys a sustainable evolutionary trajectory of the species pending preservation of threatened wetland habitats and a range-wide network of corridors.}, keywords = {Coahuila, conservation, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, Dispersal, Distribution, diversity, endangered, ENDANGERED species, estimate, estimates, Genetic, Genetic Variation, geographic, habitat, habitats, isolation, loci, MEXICO, microsatellite, Movement, patterns, populations, preservation, relationships, scale, subpopulation, Subpopulations, Terrapene, threatened, THREATENED SPECIES, variation, Wetlands}, url = {http://www3.interscience.wiley.com/journal/119878204/issue}, author = {Howeth, Jennifer and McGaugh, Suzanne and Hendrickson, Dean A.} } @unpublished {marks_coupling_2008, title = {Coupling stable isotope studies with food web manipulations to predict the effects of exotic fish: lessons from Cuatro Ci{\'e}negas, Mexico}, year = {2008}, keywords = {Coahuila, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, MEXICO}, author = {Marks, Jane C. and Williamson, C.A. and Hendrickson, Dean A.} } @inbook {hendrickson_combining_2008, title = {Combining ecological research and conservation: a case study in Cuatro Ci{\'e}negas, Mexico}, booktitle = {Aridland Springs in North America: Ecology and Conservation}, year = {2008}, pages = {127{\textendash}157}, publisher = {University of Arizona Press}, organization = {University of Arizona Press}, address = {Tucson}, keywords = {case studies, Coahuila, conservation, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, desert, Ecology, MEXICO, North America, spring, springs, study}, isbn = {978-0-8165-2645-1}, url = {d:\users\dean_h\reprints in pdf or other\Hendrickson_2008_Ecological_research_and_conservation.pdf}, author = {Hendrickson, Dean A. and Marks, Jane C. and Moline, Angela B. and Dinger, Eric C. and Cohen, Adam E.}, editor = {Stevens, L. and Meretsky, V.J.} } @inbook {hendrickson_conservation_2007, title = {Conservation of Mexican native trout and the discovery, status, protection and recovery of the Conchos trout, the first native Oncorhynchus of the Atlantic drainage in Mexico}, booktitle = {Studies of North American Desert Fishes in Honor of E. P. (Phil) Pister, Conservationist}, year = {2007}, pages = {162{\textendash}201}, publisher = {Direcci{\'o}n de Publicaciones, Universidad Aut{\'o}noma de Nuevo Le{\'o}n, Facultad de Ciencias Biol{\'o}gicas}, organization = {Direcci{\'o}n de Publicaciones, Universidad Aut{\'o}noma de Nuevo Le{\'o}n, Facultad de Ciencias Biol{\'o}gicas}, address = {Monterrey, Nuevo Le{\'o}n, M{\'e}xico}, abstract = {The Northwestern Sierra Madre Occidental of Mexico is a rugged mountain range covering portions of Sonora, Chihuahua, Durango and Sinaloa, and is drained by multiple Pacific Slope Rivers to the west and the Casas Grandes, Conchos, and Nazas to the east. The overall area is topographically, climatically and biotically diverse, ranging from endorheic basins (Casas Grandes) to mountainous areas elevations up to 3348 m, average mean temperatures from 10-20{\textdegree}C and precipitation from 250- 1100 mm/yr. The region is also geological complex that, combined with these other variables, provides a great diversity of both aquatic and terrestrial habitats conducive to both biotic endemicity and diversity. The overall diversity of the region has contribiited to the recent listing of this region by Conservation International as one of six new high-priority biodiversity hotspots. Our understanding of the aquatic and terrestrial biodiversity of this region, however, is poor and in urgent need of rapid investigation by collaborative communities. The combination of an incredibly rugged landscape, drug and bandit activities and indigenous peoples that have not always been welcoming to visitors has resulted in a general paucity of roads in the region, and the lack of access has limited inventory studies. Recently, however, access to the region has changed dramatically and many of the areas are now accessible enough for logging, mining, and agriculture practices, all exerting extreme pressures in some areas on the biodiversity. In addition to human-induced changes to these diverse ecosystems, impacts of invasive aquatic species are becoming more and more apparent, and the potential for severely reducing population sizes of species or their extirpation or extinction is real. While several invasive or exotic species are identified as potentially destructive to these communities, the exotic Rainbow Trout (Oncorhynchus mykiss) that is derived from hatcheries or culture facilities within the region represents one of the most critical threats to the aquatic and semi-aquatic biodiversity. The native trout of mainland Mexico represent the southern- most salmonids, and are at imminent risk of introgression and/or replacement by feral Rainbow Trout, Oncorhynchus mykiss. Our recent survey efforts have expanded the known diversity and ranges of each of several distinct forms, which we feel represent valid species. We discuss our discovery of multiple new species from the Sierra Madre Occidental and focus on a new species of trout restricted to the upper Conchos drainage, the first native species of Oncorhynchus known to occupy the Atlantic Slope in Mexico. Many of these taxa are restricted to small areas of intact habitat in headwater areas of high-elevation streams, and are at risk from a suite of human-associated perturbations, emerging diseases, and introduced species. These fishes occupy unique habitats, and represent a diverse portion of the Mexican montane ichthyofauna. The habitats on which they depend support a wide range of other aquatic organisms, most of which are grossly understudied. The discovery of the Conchos Trout derived primarily by GARP niche modeling of a subset of localities of previously sampled undescribed native Mexican trout, provides only a snapshot of the biodiversity awaiting to be discovered in this region. The rugged landscape of the Sierra Madre Occidental simply precludes routine sampling at easily accesible locations of streams and most sampling locations require time-intensive access. In an effort to rapidly assess the biodiversity of rivers of this region we employed this method to aid in predicting the most suitable and highly probable Mexican trout niches in the region. This method offered highly efficient and powerful results that not only predicted the occurrence of a previously unknown trout in the upper Rio Conchos but also provided excellent predictions of available habitats in drainages where previously unknown trout have been discovered by the Truchas Mexicanas team in the last nine years. Multiple threats exist to the biodiversity of the northern Sierra Madre Occidental, including uncontrolled introductions of exotic and invasive species, emerging diseases such as whirling disease, Myxobolus cerebralis, infectious pancreatic necrosis (IPN), iridioviruses and pathogenic water mold, Saprolegnia ferax, land-use practices leading to habitat degradation via overgrazing, logging, deforestation and road construction, increasing human population growth, over-fishing or overharvesting of aquatic resources and global climate cliange reducing surface and ground water in the area and creating environments more conducive to the spread of invasive species, congregated and dense human populations, and emerging diseases. Immediate actions need to be developed to aid in public education as to the threats to these ecosystems, protection of areas, assessment of diversity, and sustainable development throughout the region that incorporates a likely highly successful ecotourism system for the region.}, keywords = {Atlantic, Chihuahua, conservation, desert, Durango, fishes, Mexican trout, Oncorhynchus, recovery, Rio Conchos, Sinaloa, Sonora, Truchas Mexicanas}, isbn = {970-694-336-6}, url = {https://doi.org/10.15781/T2N873K64}, author = {Hendrickson, Dean A. and Neely, David A. and Mayden, Richard L. and Anderson, K. and Brooks, James E. and Camarena-Rosales, Faustino and Cutter, Ralph F. and Cutter, Lisa and De Los Santos Camarillo, Ana Belia and Ernsting, Guy W. and Espinosa-P{\'e}rez, H{\'e}ctor and Findley, Lloyd T. and Garc{\'\i}a De Le{\'o}n, Francisco J. and George, A.L. and Hatch, John and Kuhajda, Bernard R. and Mayden, Kyle E. and McNyset, Kristina M. and Nielsen, Jennifer L. and Pfeiffer, Frank W. and Propst, David L. and Ruiz-Campos, Gorgonio and St.Clair, E. and Tomelleri, Joseph R. and Varela-Romero, Alejandro}, editor = {Lozano-Vilano, Ma. de Lourdes and Contreras-Balderas, Armando J.} } @article {lundberg_discovery_2007, title = {Discovery of African roots for the Mesoamerican Chiapas catfish, Lacantunia enigmatica, requires an ancient intercontinental passage}, journal = {Proceedings of the Academy of Natural Sciences of Philadelphia}, volume = {156}, number = {1}, year = {2007}, month = {jun}, pages = {39{\textendash}53}, keywords = {Lacantunia enigmatica, Lacantunidae}, issn = {0097-3157}, doi = {10.1635/0097-3157(2007)156[39:DOARFT]2.0.CO;2}, url = {http://dx.doi.org/10.1635/0097-3157(2007)156[39:DOARFT]2.0.CO;2}, author = {Lundberg, John G. and Sullivan, John P. and Rodiles-Hern{\'a}ndez, Roc{\'\i}o and Hendrickson, Dean A.} } @inbook {mcgaugh_fighting_2007, title = {Fighting an aggressive wetlands invader: A case study of Giant Reed (Arundo donax) and its threat to Cuatro Ci{\'e}negas, Coahuila, M{\'e}xico}, booktitle = {Studies of North American Desert Fishes in Honor of E. P. (Phil) Pister, Conservationist}, year = {2007}, publisher = {Universidad Aut{\'o}noma de Nuevo Le{\'o}n, Facultad de Ciencias Biol{\'o}gicas}, organization = {Universidad Aut{\'o}noma de Nuevo Le{\'o}n, Facultad de Ciencias Biol{\'o}gicas}, address = {Monterrey, Nuevo Le{\'o}n, M{\'e}xico}, keywords = {Arundo, Arundo donax, Atlantic, case studies, Chihuahua, Coahuila, Conchos, conservation, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, desert, drainage, Ecology, fishes, MEXICO, Oncorhynchus, protection, recovery, Sinaloa, Sonora, status, study, threatened, tropical, trout, Wetlands}, url = {d:\users\dean_h\reprints in pdf or other\McGaugh_etal_2006_Arundo_en_Cuatrocienegas(bilingue).pdf}, author = {McGaugh, Suzanne and Hendrickson, Dean A. and Bell, Gary P. and Cabral, Hernando and Lyons, Kelly and McEachron, Lucas and Mu{\~n}oz J., Oscar}, editor = {Lozano-Vilano, Maria de Lourdes and Contreras-Balderas, Armando J.} } @article {varela-romero_molecular_2007, title = {Molecular diagnosis of Ictalurus pricei, the endangered Yaqui catfish, and contributions toward conservation of the species}, year = {2007}, abstract = {A complex of little-studied catfishes of the genus ⬚Ictalurus⬚ is native to Pacific drainages of the Sierra Madre Occidental and interior drainages of Northwest Mexico. Its only described member, ⬚Ictalurus pricei⬚, is protected by the Mexican and US governments and given varied conservation status by diverse other conservation organizations. We contribute new data and a review of previous work to partially rectify prior inadquacies of genetic and conservation status information on the complex. Sequence data for the cytochrome b (⬚cytb⬚) and 12S ribosomal (⬚12SrRNA⬚) mitochondrial genes provide new diagnostic molecular characters for ⬚I. pricei⬚ and both genes display intra-specific variation. The only ⬚I. pricei⬚ specimens we could obtain, however, despite extensive field collection efforts, were from a captive broodstock established starting 20 years ago for conservation purposes. We provide basic, previously unpublished information about the history and, unfortunately, recent apparent demise of that captive stock. Non-native catfishes are widely introduced throughout the range of the ⬚pricei⬚ complex and, along with habitat degradation, represent a significant, but still very little-studied threat to its genetic integrity and persistence. Conservation of the Yaqui catfish is clearly a complicated issue with much remaining to be learned, but it is clear that current levels of protection do not adequately reflect its critical conservation plight and management efforts to date have failed to provide appropriate, long-term conservation actions and much-needed research.}, keywords = {collection, conservation, cytochrome, Cytochrome b, degradation, diagnosis, display, drainage, drainages, endangered, Genes, Genetic, Governments, habitat, habitat degradation, history, Ictalurus, Ictalurus pricei, intraspecific, levels, long-term, management, NEW, non-native, organization, organizations, Pacific, persistence, protection, sequence, Sierra Madre Occidental, specimens, status, stock, US, variation, Yaqui, Yaqui catfish}, author = {Varela-Romero, A. and Yepiz-Plascencia, G. and Hendrickson, Dean A. and Brooks, J.E. and Neely, D.A. and Peregrino-Uriarte, A.B.} } @inbook {schmitter-soto_herichthys_2007, title = {Herichthys minckleyi}, booktitle = {Evaluaci{\'o}n de Riesgo de Extinci{\'o}n de los C{\'\i}clidos Mexicanos y de los peces de la frontera sur incluidos en la NOM-059}, volume = {Proyecto No. CK001}, year = {2007}, pages = {13}, publisher = {El Colegio de la Frontera Sur (ECOSUR) and Comisi{\'o}n Nacional para el Conocimiento y Uso de la Biodiversidad, M{\'e}xico, D.F.}, organization = {El Colegio de la Frontera Sur (ECOSUR) and Comisi{\'o}n Nacional para el Conocimiento y Uso de la Biodiversidad, M{\'e}xico, D.F.}, address = {Chetumal, Quintana Roo}, abstract = {Este proyecto se refiere a dos grupos de peces incluidos en la Norma Oficial Mexicana-059-SEMARNAT-2001 (NOM-059). El primero es un grupo taxon{\'o}mico, la familia Cichlidae (mojarras de agua dulce), del cual aparecen en la NOM-059 ocho especies, seis de ellas carentes todav{\'\i}a de la ficha correspondiente; todas se asignaron en la NOM err{\'o}neamente al g{\'e}nero Cichlasoma, a pesar de que desde hace m{\'a}s de 20 a{\~n}os qued{\'o} demostrado que ese taxon no existe en M{\'e}xico (Kullander, 1983). De las seis especies sin ficha, en el sur de M{\'e}xico est{\'a}n C. grammodes (excluida de la presente propuesta por estar ya incluida en otra), C. (= Vieja) hartwegi, C. intermedium (= V. intermedia), C. (= Thorichthys) socolofi y, en el norte, C. (= Herichthys) steindachneri y C. (= Herichthys) minckleyi, esta {\'u}ltima con un interesante polimorfismo tr{\'o}fico. El segundo grupo abordado en esta propuesta se refiere a los peces de la frontera sur (entendida aqu{\'\i} como toda la pen{\'\i}nsula de Yucat{\'a}n y el estado de Chiapas) enlistados en la NOM-059. Adem{\'a}s de los c{\'\i}clidos mencionados, este segundo grupo consiste en once especies: Astyanax armandoi, los Cyprinodon end{\'e}micos de la laguna de Chichancanab, Quintana Roo (C. beltrani, C. labiosus, C. maya, C. simus y C. verecundus {\textendash} la NOM no toma en cuenta todav{\'\i}a al sexto, C. esconditus Strecker 2002, ni al s{\'e}ptimo, C. suavium Strecker 2005), Poecilia velifera, Profundulus hildebrandi, Potamarius nelsoni, Ogilbia (=Typhliasina) pearsei y Ophisternon infernale; la NOM contempla adem{\'a}s a Rhamdia guatemalensis, que ya cuenta con una ficha, a pesar de que su validez taxon{\'o}mica ha sido cuestionada (Silfvergrip 1996), y a pesar de su ampl{\'\i}sima distribuci{\'o}n y abundancia. El objetivo central de la contribuci{\'o}n fue elaborar las fichas correspondientes y obtener el valor que asigna a cada una de estas 16 especies el M{\'e}todo de Evaluaci{\'o}n del Riesgo de Extinci{\'o}n de las especies silvestres en M{\'e}xico (MER), para recomendar su reclasificaci{\'o}n o su exclusi{\'o}n de la lista, si fuera necesario. La informaci{\'o}n necesaria se ha tomado de la literatura, tanto publicada como {\textquotedblleft}gris{\textquotedblright}, {\'e}sta {\'u}ltima integrada fundamentalmente por datos in{\'e}ditos de los investigadores participantes, sus estudiantes y otros colegas. Como resultado de lo anterior, se anexan tres propuestas formales de cambio de categor{\'\i}a de riesgo: C. beltrani (de [P] a [A]), Th. socolofi (de [Pr] a [A]) y V. hartwegi (de [Pr] a [A]). En el caso de A. armandoi, la ficha incluye y fundamenta una observaci{\'o}n sobre el car{\'a}cter dudoso de su identidad taxon{\'o}mica, aunque, por principio precautorio, no se propone (todav{\'\i}a) excluirla de la NOM. Las dem{\'a}s especies estudiadas permanecen sin cambios en su categor{\'\i}a de riesgo. Adem{\'a}s, siempre con base en la aplicaci{\'o}n del MER, se recomienda la inclusi{\'o}n de otras siete especies de la frontera sur hasta ahora ignoradas por la NOM-059: Astyanax altior, Cyprinodon esconditus, C. suavium, Fundulus grandissimus, F. persimilis, Lacantunia enigmatica y Menidia colei. Finalmente, se recomienda formalmente la exclusi{\'o}n de Rhamdia guatemalensis de la NOM-059.}, keywords = {Coahuila, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, MEXICO}, url = {http://www.conabio.gob.mx/conocimiento/ise/fichasnom/Herichthysminckleyi00.pdf}, author = {Hendrickson, Dean A.}, editor = {Schmitter-Soto, Juan Jacobo} } @booklet {schmitter-soto_evaluacion_2006, title = {Evaluaci{\'o}n del riesgo de extinci{\'o}n de los c{\'\i}clidos mexicanos y de los peces de la frontera sur incluidos en la NOM-059}, year = {2006}, pages = {1{\textendash}140}, publisher = {CONABIO (Comisi{\'o}n Nacional para el Conocimiento y Uso de la Biodiversidad)}, type = {Informe T{\textquoteright}ecnico Final}, address = {ECOSUR, Chetumal, Quintana Roo, M{\'e}xico}, abstract = {Este proyecto se refiere a dos grupos de peces incluidos en la Norma Oficial Mexicana-059-SEMARNAT-2001 (NOM-059). El primero es un grupo taxon{\'o}mico, la familia Cichlidae (mojarras de agua dulce), del cual aparecen en la NOM-059 ocho especies, seis de ellas carentes todav{\'\i}a de la ficha correspondiente; todas se asignaron en la NOM err{\'o}neamente al g{\'e}nero Cichlasoma, a pesar de que desde hace m{\'a}s de 20 a{\~n}os qued{\'o} demostrado que ese taxon no existe en M{\'e}xico (Kullander, 1983). De las seis especies sin ficha, en el sur de M{\'e}xico est{\'a}n C. grammodes (excluida de la presente propuesta por estar ya incluida en otra), C. (= Vieja) hartwegi, C. intermedium (= V. intermedia), C. (= Thorichthys) socolofi y, en el norte, C. (= Herichthys) steindachneri y C. (= Herichthys) minckleyi, esta {\'u}ltima con un interesante polimorfismo tr{\'o}fico. El segundo grupo abordado en esta propuesta se refiere a los peces de la frontera sur (entendida aqu{\'\i} como toda la pen{\'\i}nsula de Yucat{\'a}n y el estado de Chiapas) enlistados en la NOM-059. Adem{\'a}s de los c{\'\i}clidos mencionados, este segundo grupo consiste en once especies: Astyanax armandoi, los Cyprinodon end{\'e}micos de la laguna de Chichancanab, Quintana Roo (C. beltrani, C. labiosus, C. maya, C. simus y C. verecundus {\textendash} la NOM no toma en cuenta todav{\'\i}a al sexto, C. esconditus Strecker 2002, ni al s{\'e}ptimo, C. suavium Strecker 2005), Poecilia velifera, Profundulus hildebrandi, Potamarius nelsoni, Ogilbia (=Typhliasina) pearsei y Ophisternon infernale; la NOM contempla adem{\'a}s a Rhamdia guatemalensis, que ya cuenta con una ficha, a pesar de que su validez taxon{\'o}mica ha sido cuestionada (Silfvergrip 1996), y a pesar de su ampl{\'\i}sima distribuci{\'o}n y abundancia. El objetivo central de la contribuci{\'o}n fue elaborar las fichas correspondientes y obtener el valor que asigna a cada una de estas 16 especies el M{\'e}todo de Evaluaci{\'o}n del Riesgo de Extinci{\'o}n de las especies silvestres en M{\'e}xico (MER), para recomendar su reclasificaci{\'o}n o su exclusi{\'o}n de la lista, si fuera necesario. La informaci{\'o}n necesaria se ha tomado de la literatura, tanto publicada como {\textquotedblleft}gris{\textquotedblright}, {\'e}sta {\'u}ltima integrada fundamentalmente por datos in{\'e}ditos de los investigadores participantes, sus estudiantes y otros colegas. Como resultado de lo anterior, se anexan tres propuestas formales de cambio de categor{\'\i}a de riesgo: C. beltrani (de [P] a [A]), Th. socolofi (de [Pr] a [A]) y V. hartwegi (de [Pr] a [A]). En el caso de A. armandoi, la ficha incluye y fundamenta una observaci{\'o}n sobre el car{\'a}cter dudoso de su identidad taxon{\'o}mica, aunque, por principio precautorio, no se propone (todav{\'\i}a) excluirla de la NOM. Las dem{\'a}s especies estudiadas permanecen sin cambios en su categor{\'\i}a de riesgo. Adem{\'a}s, siempre con base en la aplicaci{\'o}n del MER, se recomienda la inclusi{\'o}n de otras siete especies de la frontera sur hasta ahora ignoradas por la NOM-059: Astyanax altior, Cyprinodon esconditus, C. suavium, Fundulus grandissimus, F. persimilis, Lacantunia enigmatica y Menidia colei. Finalmente, se recomienda formalmente la exclusi{\'o}n de Rhamdia guatemalensis de la NOM-059.}, keywords = {Coahuila, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, Herichthys minckleyi, MEXICO}, url = {https://www.researchgate.net/publication/260971555_Evaluacion_del_riesgo_de_extincion_de_los_ciclidos_mexicanos_y_de_los_peces_de_la_frontera_sur_incluidos_en_la_NOM-059}, author = {Schmitter-Soto, J.J. and Rodiles-Hern{\'a}ndez, Roc{\'\i}o and Hendrickson, Dean A.} } @booklet {mayden_richard_l._sger:_2006, title = {SGER: Biodiversity of Native Mexican Trout (Genus Oncorhynchus spp.) and The Impending Treat of Their Demise by The Exotic Rainbow Trout O. mykiss gairdneri (Teleostei: Salmonidae). DEB 0240184}, number = {DEB 0240184}, year = {2006}, pages = {33}, abstract = {A grant has been awarded to Dr. Richard L. Mayden at Saint Louis University to conduct field and laboratory research in collaboration with other USA scientists and several scientists from Mexico on the environmental status, distribution, conservation and genetics of native trout populations of Mexico. While biologists have been aware of the existence of native trout in Mexico for over a century, they have received little study. Beginning in the mid-1990{\textquoteright}s a group of ichthyologists and conservation biologists from both Mexico and USA jointly formed an international alliance, Truchas Mexicanas, to better understand the native trout of the Sierra Madre Occidental. Through these efforts, scientists have discovered previously unknown trout species restricted to Mexico and introduced (non-native) populations of rainbow trout. The existence of these non-native rainbow trout originating from streams in the US and Canada in the ranges of the unique Mexican trout species is a significant threat to the future existence of native species. Rainbow trout are known to displace native trout species through competition or genetically "swamp out" their gene pools through aggressive hybridization. Other native populations of trout are also predicted to occur in the upper Rio Conchos; these populations are predicted to also be in danger from habitat destruction and introductions of rainbow trout. In this study we will inventory many river systems of the sierras for native and introduced trout species, including the upper Conchos River system. Genetic samples will be examined from all of these populations to evaluate genetic variability of native species and determine if any native populations are compromised genetically through hybridization with introduced rainbow trout. This research supports the development of an international alliance investigating native trout populations of Mexico and southwestern United States. Trout species are important game and forage species for human populations, constituting a major element of diets in some regions. Trout fisheries are also very important economic elements to some regions as trout are highly prized sport fish species. Understanding native trout species diversity in Mexico and its conservation and maintenance in these streams has a major impact on both fisheries and economic areas. Mexican trout species are the southern-most trout and are adapted to theses unique ecosystems. Introductions of non-native rainbow trouts will seriously jeopardize these adapted populations and lead to their extirpation from the region. This will have serious sociological and economic impacts for the native people of the region.}, keywords = {Mexican trout, Truchas Mexicanas}, url = {http://bio.slu.edu/mayden/truchas/NSF_trout_final_report.pdf}, author = {Mayden, Richard L.} } @booklet {camarena-rosales_conservation_2006, title = {Conservation of the Conchos Trout: a white paper on history of its discovery, report on its status, and an urgent plea for action}, year = {2006}, pages = {1{\textendash}11}, address = {University of Texas, Austin, Texas, USA}, abstract = {A broad-scale survey of potential trout habitats in upper tributaries of the R{\'\i}o Conchos of Chihuahua, M{\'e}xico resulted in the re-discovery in 2005 of a long-lost native, endemic, and now endangered, undescribed trout species that we call the "Conchos Trout." We are currently in the process of scientifically describing this rare trout, the only native Mexican trout known from an Atlantic drainage. Our extensive field efforts to date clearly indicate that this species was formerly much more widely distributed historically. Though surveys should continue, our extensive field surveys found only one small isolated and extremely vulnerable population, leaving us less than optimistic that many other, if any, additional populations will be found. Persistence of this new critically endangered endemic Conchos Trout clearly requires rapid conservation action. Our consensus expert opinion is that we cannot over-emphasize the urgency of protection for this critically endangered population of this unique trout, and so we have produced this "white paper" in hopes that it might encourage others to join us in initiating appropriate conservation programs. The potentially viable population is restricted to a short reach of a very small stream where it and another newly discovered, undescribed fish species, a sucker (and likely another unique taxon), could be relatively easily protected, studied and managed. Additionally, adjoining arroyos where the species recently occurred offer the possibility of restoring native fish populations to them following appropriate protection and habitat restoration efforts. All members of our highly qualified and diversely specialized, binational "Truchas Mexicanas" team stand prepared to join collaborators and invest personal resources in hands-on actions to help this new species persist. We recommend immediate establishment of a small reserve centered around currently occupied habitat and adjacent streams having suitable habitat, combined with education and compensation of local residents for their cooperation with reserve management. We recognize that we are largely ignorant of the local political and cultural systems via which conservation actions will have to proceed and are limited with regard to our ability to raise funds. We thus hope that readers of this white paper will add their financial and in-kind support and additional expertise to help us conserve the Conchos Trout!}, keywords = {Chihuahua, Conchos, conservation, endangered, Mexican trout, MEXICO, Truchas Mexicanas}, url = {http://hdl.handle.net/2152/22233}, author = {Camarena-Rosales, Faustino and Cutter, R. and de Los Santos, A.B. and Espinosa-P{\'e}rez, H. and Garc{\'\i}a de Le{\'o}n, F.J. and Hendrickson, Dean A. and Kuhajda, B.R. and Mayden, Richard L. and Neely, D.A. and Pfeifer, Frank and Propst, David L. and Ruiz-Campos, Gorgonio and Tomelleri, J.R. and Varela-Romero, Alejandro} } @article {hulsey_feeding_2006, title = {Feeding specialization in Herichthys minckleyi: a trophically polymorphic fish}, journal = {Journal of Fish Biology}, volume = {68}, number = {5}, year = {2006}, pages = {1399{\textendash}1410}, abstract = {The gut contents of Herichthys minckleyi were examined to determine if variation in jaw morphology in this trophically polymorphic cichlid fish is associated with feeding specialization. First, individual H. minckleyi were categorized as having molariform, papilliform, or undetermined pharyngeal morphology. Molariforms possess large molar-like teeth and robust crushing musculature, papilliforms exhibit only small pointed papilliform teeth on their more gracile jaws, and undetermined individuals (\textless 50 mm standard length) were not clearly assignable to one of the other two morphotypes. Undetermined individuals did not consume as great a percentage of plant material as papilliforms and never crushed snails. Aquatic arthropods comprised a small proportion of prey material recovered from the three pharyngeal morphotypes. Papilliforms, once size was accounted for as a covariate, consumed substantially more plant detritus than molariforms, while molariforms consumed snails more frequently than papilliforms. Even when only comparing molariforms and papilliforms that did consume snails, molariforms consistently crushed a greater number of the robust and extremely abundant snails Mexipyrgus churinceanus, Mexithauma quadripaludium, and Nymphopilus minckleyi. Contrary to expectation, there was no relationship between molariform standard length and the number of snails crushed. However, greater molariform tooth number, adjusted for standard length, was correlated with the inclusion of snails in molariform gut contents. The diet differences recovered between molariform and papilliform H. minckleyi suggest current ecological differentiation plays a role in maintaining this trophic polymorphism.}, keywords = {aquatic, biology, cichlid, Cichlid fish, Coahuila, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, differentiation, feeding, Fish, Herichthys, Herichthys minckleyi, individuals, jaw, length, MEXICO, Morphology, pharyngeal, Plant, Polymorphism, Prey, relationships, size, snails, TEETH, TNHC, variation}, url = {d:\users\dean_h\reprints in pdf or other{\H u}lsey_2006_Feeding_specialization_H_minckleyi.pdf}, author = {Hulsey, C.D. and Marks, Jane C. and Hendrickson, Dean A. and Williamson, C.A. and Cohen, Adam E. and Stephens, M.J.} } @article {dinger_role_2006, title = {Role of fish in structuring invertebrates on stromatolites in Cuatro Ci{\'e}negas, M{\'e}xico}, journal = {Hydrobiologia}, volume = {563}, year = {2006}, pages = {407{\textendash}420}, abstract = {Stromatolites, the dominant Precambrian life form, declined in the Phanerozoic to occur today in only a few sites. This decline has been attributed to evolution of metazoan grazers, but stromatolites in our study site, Cuatro Cie{\textquoteright}negas, Coahuila, Me{\textquoteright}xico, harbor diverse macroinvertebrates. Drawing on food chain theory, we hypothesized that fish predation on invertebrates controls invertebrate populations, allowing stromatolites to flourish in Cuatro Cie{\textquoteright}negas. Our experiment used small mesh (1 mm) cages to exclude all but larval fishes, and larger (6.5 mm) cages to exclude all larger fishes (including the molluscivorous and omnivorous endemic polymorphic cichlid, Herichthys minckleyi), but allow access to all sizes of the abundant endemic pupfish, Cyprinodon bifasciatus. No effects of treatments on invertebrate densities were noted at 6 week, but significant effects were observed on specific taxonomic groups after 3 month. In absence of fishes, hydrobiidae snails and ceratopogonids increased 3- and 5-fold, respectively, and invertebrate assemblage composition varied among treatments. Algal biomass was not affected by treatments, but algal species composition appeared to change. Overall results suggest that fish assemblages structure invertebrate assemblages, and that fishes may also be factors in determining algal communities.}, keywords = {assemblages, biomass, cichlid, Coahuila, composition, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, density, Evolution, Fish, FISH ASSEMBLAGE, fishes, GRAZER, Hydrobiidae, invertebrate, Invertebrates, larval, MEXICO, populations, Predation, pupfish, snails, species composition, stromatolites, Structure, study}, url = {d:\users\dean_h\reprints in pdf or other\Dinger_2006_Role_of_fish_invertebrates_stomatolites.pdf}, author = {Dinger, Eric C. and Hendrickson, Dean A. and Winsborough, B.M. and Marks, Jane C.} } @inbook {rodiles-hernandez_family_2005, title = {Family Lacantuniidae n. fam: Lacantunia n. gen.: Lacantunia enigmatica n. sp. Rodiles-Hern{\'a}ndez, Hendrickson \& Lundberg 2005}, booktitle = {Lacantunia enigmatica (Teleostei: Siluriformes) a new and phylogenetically puzzling freshwater fish from Mesoamerica}, volume = {1000}, year = {2005}, month = {may}, pages = {5{\textendash}17}, publisher = {Zootaxa}, organization = {Zootaxa}, abstract = {A new family (Lacantuniidae), genus and species of catfish, Lacantunia enigmatica, is described from the R{\'\i}o Usumacinta basin of Chiapas, M{\'e}xico. This odd siluriform is diagnosed by five distinctively autapomorphic and anatomically complex structures. The fifth (last) infraorbital bone is relatively large, anteriorly convex and remote from a prominent sphenotic process. The lateral margin of the frontal, lateral ethmoid and sphenotic bones are thick at the origins of much enlarged adductor mandibulae and levator arcus palatini muscles; otherwise the skull roof is constricted and flat. One pair of cone-shaped "pseudo-pharyngobranchial" bones is present at the anterior tips of enlarged cartilages medial to the first epibranchial. A hypertrophied, axe-shaped uncinate process emerges dorsally from the third epibranchial. The gas bladder has paired spherical, unencapsulated diverticulae protruding from its anterodorsal wall. Lacantunia enigmatica cannot be placed within or as a basal sister lineage to any known catfish family or multifamily clade except Siluroidei. This species may represent an ancient group, perhaps of early Tertiary age or older, and it adds another biogeographic puzzle to the historically complex Mesoamerican biota.}, keywords = {Lacantunia enigmatica, Lacantunidae}, url = {http://www.mapress.com/zootaxa/2005f/z01000f.pdf}, author = {Rodiles-Hern{\'a}ndez, Rocio and Hendrickson, Dean A. and Lundberg, John G.} } @inbook {garcia_de_leon_fishes_2005, title = {Fishes of the continental waters of Tamaulipas: diversity and conservation status}, booktitle = {Biodiversity, Ecosystems, and Conservation in Northern Mexico}, year = {2005}, pages = {138{\textendash}166}, publisher = {Oxford University Press}, organization = {Oxford University Press}, address = {New York, USA}, abstract = {With an origin dating back 400 million years, fishes represent the most ancient group of vertebrates (Helfman et al. 1997). They are also the most diverse, with more than 25,000 species. Of the more than 2200 species known from Mexico, about 500 live in freshwater. The Mexican Official Norm NOM-059-ECOL-2001 lists only 186 fish species among the 1515 vertebrates "At Risk" in Mexico (SEMARNAT 2002; see chapter 4). Fishes thus account for only 12.3\% of all listed species in Mexico, compared to 30.8\% for reptiles, 24.8\% birds, and 19.5\% mammals. Why are so few fishes listed in Mexico? The answer probably has little to do with actual conservation status and more to do with other factors. First, the great taxonomic diversity of fishes renders any comprehensive evaluation of their conservation status quite daunting. Not only are fishes more than half of all vertebrate species, but new species continue to be described every year (Helfman et al. 1997). Because fishes live only in water, they are more difficult to observe than are most other vertebrates. Finally, fishes show a high degree of intraspecific phenotypic variation that makes them highly sensitive to environmental factors and often difficult to identify (Allendorf et al. 1987; Allendorf 1988). Fishes are important to humans because they represent an important source of food. Their commercial and recreational value has led to fish farming on an industrial scale, both for easy exploitation and as a means to recover overharvested natural populations. Scientific interest in fishes is also considerable. Those species easy to manage in captivity can be used in laboratory experiments. Additionally, freshwater fishes in particular can be used as biogeographic indicators, contributing important information to our understanding of the history of river basins and serving as indicators of aquatic ecosystem health. Though their aquatic habitats perhaps make wild fish populations more difficult to study than terrestrial organisms, they clearly deserve greater emphasis in the field of biological conservation. The northern part of Mexico harbors 3 aquatic ecoregions known as the Sonoran, ChihuahuanPotosian, and Tamaulipan regions (ContrerasBalderas 1969). The Tamaulipan ecoregion is located between the Sierra Madre Oriental and the Gulf of Mexico, within the Mexican states of Coahuila, Nuevo Leon, and Tamaulipas (CONABIO 2000); the last of these states is the focus of this chapter. To the north, Tamaulipas is bounded by the Rio Grande (Rio Bravo), which marks the border with Texas. To the west, Tamaulipas is bounded by the Mexican states of Nuevo Leon and San Luis Potosi, to the east by the Gulf of Mexico, and to the south by the states of Veracruz and San Luis Potosi (fig. 7.1). The geomorphology of watersheds influences species richness (Eadie et al. 1986). For example, river discharge is a direct measure of availability of habitat for freshwater fishes (Livingstone et al. Patterns of Species Diversity and Ecological Importance of Natural Ecosystems 1982), and there is a positive correlation between species richness and surface area of a river basin (Horwitz 1978). Thus, anthropogenic alterations of a watershed can drastically reduce its associated biological diversity (Sheldon 1987). Decreases in total habitat area and habitat fragmentation (typically a result of dams) occur conjunctively, reducing not only the size of many populations but also the potential for dispersal and genetic flow (Frankham et al. 2001). Additionally, diversion canals linking once separate waterways, and the introduction of exotic species, are both leading to homogenization of aquatic faunas (Sheldon 1988). Due to the rapid increase in hu.man populations, northern Mexico has experienced major, humaninduced alterations and fragmentation of its watersheds and associated changes in the distribution of taxa and loss of biodiversity (Contreras-Balderas 1978). Clearly, any conservation effort requires an inventory of the ichthyofauna using a taxonomic and biogeographic approach, focusing on documenting and maintaining overall biodiversity, but also including the rare and endangered species. The specific objectives of the study described in this chapter were to evaluate the diversity of freshwater fishes in Tamaulipas, to characterize each watershed and analyze the status of its ichthyofauna, and to determine the level of anthropogenic impact on freshwater fish communities statewide. We begin with a description of the watersheds of Tamaulipas, then present a synthesis of the state of knowledge of taxonomy, biology, genetics, evolution, exploitation, and conservation of fishes in Tamaulipas and provide the first list of freshwater fishes assembled for the state.}, keywords = {Biodiversity, conservation, diversity, ecosystems, fishes, Tamaulipas, TNHC}, isbn = {13-978-0-19-515672-0; 0-19-515672-2}, doi = {10.15781/T2XK85B0W}, url = {d:\users\dean_h\reprints in pdf or other\Garcia_de_Leon_2005_Fishes_Tamaulipas.pdf}, author = {Garc{\'\i}a De Le{\'o}n, Francisco J. and Guti{\'e}rrez Tirado, D. and Hendrickson, Dean A. and Espinosa-P{\'e}rez, H.}, editor = {Cartron, J-L.E. and Ceballos, G. and Felger, R.S.} } @inbook {hudson_rivers_2005, title = {Rivers of Mexico}, booktitle = {Rivers of North America}, year = {2005}, pages = {1031{\textendash}1084}, publisher = {Academic Press}, organization = {Academic Press}, address = {New York}, keywords = {Coahuila, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, MEXICO, North America, Rivers}, author = {Hudson, Paul F. and Hendrickson, Dean A. and Benke, Arthur C. and Rodiles-Hern{\'a}ndez, Rocio and Varela-Romero, Alejandro and Minckley, Wendell L.}, editor = {Benke, Arthur C. and Cushing, B.} } @article {rodiles-hernandez_lacantunia_2005, title = {Lacantunia enigmatica (Teleostei: Siluriformes) a new and phylogenetically puzzling freshwater fish from Mesoamerica}, journal = {Zootaxa}, volume = {1000}, year = {2005}, pages = {1{\textendash}24}, abstract = {A new family (Lacantuniidae), genus and species of catfish, Lacantunia enigmatica, is described from the R{\'\i}o Usumacinta basin of Chiapas, M{\'e}xico. This odd siluriform is diagnosed by five distinctively autapomorphic and anatomically complex structures. The fifth (last) infraorbital bone is relatively large, anteriorly convex and remote from a prominent sphenotic process. The lateral margin of the frontal, lateral ethmoid and sphenotic bones are thick at the origins of much enlarged adductor mandibulae and levator arcus palatini muscles; otherwise the skull roof is constricted and flat. One pair of cone-shaped "pseudo-pharyngobranchial" bones is present at the anterior tips of enlarged cartilages medial to the first epibranchial. A hypertrophied, axe-shaped uncinate process emerges dorsally from the third epibranchial. The gas bladder has paired spherical, unencapsulated diverticulae protruding from its anterodorsal wall. Lacantunia enigmatica cannot be placed within or as a basal sister lineage to any known catfish family or multifamily clade except Siluroidei. This species may represent an ancient group, perhaps of early Tertiary age or older, and it adds another biogeographic puzzle to the historically complex Mesoamerican biota.}, keywords = {Lacantunia enigmatica, Lacantunidae}, issn = {ISSN 1175-5334}, url = {http://www.mapress.com/zootaxa/2005f/z01000f.pdf}, author = {Rodiles-Hern{\'a}ndez, Rocio and Hendrickson, Dean A. and Lundberg, John G. and Humphries, Julian M.} } @article {dinger_aquatic_2005, title = {Aquatic invertebrates of Cuatro Ci{\'e}negas, Coahuila, M{\'e}xico: natives and exotics}, journal = {The Southwestern Naturalist}, volume = {50}, number = {2}, year = {2005}, pages = {237{\textendash}246}, abstract = {A recent survey of benthic macroinvertebrates of the Cuatro Cienegas basin found 118 species in the 21 sites collected. Four exotic macroinvertebrates that could threaten the native biota were found within or near the basin.}, keywords = {aquatic, benthic, Biota, Coahuila, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, EXOTIC, exotics, invertebrate, Invertebrates, MEXICO, survey}, url = {d:\users\dean_h\reprints in pdf or other\Dinger_2005_Aquatic_inverts_Cuatro_Cienegas.pdf}, author = {Dinger, Eric C. and Cohen, Adam E. and Hendrickson, Dean A. and Marks, Jane C.} } @booklet {hendrickson_arundo_2005, title = {Arundo donax (Carrizo grande / Giant cane) in Cuatro Ci{\'e}negas}, journal = {http://www.desertfishes.org/cuatroc/organisms/non-native/arundo/Arundo.html}, year = {2005}, keywords = {Arundo, Arundo donax, Coahuila, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, MEXICO}, url = {http://www.desertfishes.org/cuatroc/organisms/non-native/arundo/Arundo.html}, author = {Hendrickson, Dean A. and McGaugh, Suzanne} } @article {cohen_habitat_2005, title = {Habitat segregation among trophic morphs of the Cuatro Cien{\'e}gas cichlid (Herichthys minckleyi)}, journal = {Hidrobiol{\'o}gica}, volume = {15}, number = {2}, year = {2005}, pages = {169{\textendash}181}, abstract = {Herichthys minckleyi Kornfield \& Taylor 1983 is an endangered, trophically polymorphic cichlid endemic to the Cuatro Ci{\'e}negas basin of Coahuila, Mexico. A "molariform" morph has stout pharyngeal teeth while a "papilliform" morph has numerous fine pharyngeal teeth. Individuals with intermediate pharyngeal dentition also exist, as does yet another morph, called the "piscivore," that has a comparatively more fusiform body than do "normal-bodied" individuals. Previous studies indicated that morphs utilize different food sources, thus suggesting morph-specific spatial segregation would be likely since food resource availability is spatially heterogeneous. We present data from an observational study of all morphs (but focusing on the 3 most common, normal-bodied ones - molariform, papilliform and intermediate) in a single spring pool, Poza Mojarral Oeste. We analyzed morph distribution in relation to habitat types, and document morph-specific differences in feeding behavior. Habitat partitioning on both spatial and temporal axes was also investigated. Habitat use by each molariform, papilliform, and intermediate pharyngeal morphs was found to be non-random. Morphs differed in habitat use, albeit with considerable overlap. Strong segregation among morphs was not detected in any season or time of day, but habitat use patterns varied seasonally within each morph and were consistently different among morphs. Morphs of this species displayed a variety of feeding behaviors, but in general all behave as feeding generalists. This endangered species may prove more difficult to manage than are other, non-polymorphic species. It is clearly important to manage not only for the maintenance of the species, but also for maintenance of its different morphs, which our study indicates may each require different mixes of habitat types⬚. We thus hypothesize that any changes in habitat heterogeneity will lead to altered proportions of the different morphs of the species.⬚}, keywords = {Behavior, changes, cichlid, Coahuila, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, Distribution, endangered, ENDANGERED species, feeding, FEEDING BEHAVIOR, habitat, Herichthys, Herichthys minckleyi, heterogeneity, individuals, lead, MEXICO, patterns, pharyngeal, segregation, spring, study, TEETH}, url = {d:\users\dean_h\reprints in pdf or other\Cohen_2005_Habitat_segregation_minckleyi.pdf}, author = {Cohen, Adam E. and Hendrickson, Dean A. and Parmesan, C. and Marks, Jane C.} } @article {hulsey_trophic_2005, title = {Trophic morphology, feeding performance, and prey use in the polymorphic fish Herichthys minckleyi}, journal = {Evolutonary Ecology Research}, volume = {7}, year = {2005}, pages = {1{\textendash}22}, abstract = {We studied how pharyngeal jaw morphology influences feeding performance and prey use in the trophically polymorphic cichlid fish Herichthys minckleyi. In this species, the pharyngeal jaw exhibits two discrete morphologies. "Molariforms" possess robust jaw structure with flattened teeth and enlarged muscles, and "papilliforms" exhibit more gracile jaws, pointed teeth, and smaller muscles. The threefold difference in molariform and papilliform pharyngeal muscle mass found in an ontogenetic series of individuals (Range: 65 mm to 146 mm) support the hypothesis that the morphotypes differ in crushing force used to process prey. For both morphotypes, we also tested for tradeoffs in handling time and the ability to process several types of prey that occur in H. minckleyi{\textquoteright}s native habitat, Cuatro Ci{\textflorin}\_snegas. Unexpectedly, handling time on plants and arthropods was only slightly different between morphotypes. However, papilliforms consistently shredded plants more finely than molariforms, while only molariforms appeared capable of crushing snails. We inferred molariforms routinely employed their maximum force producing capabilities in the wild to crush the exceptionally hard snails endemic to Cuatro Ci{\textflorin}\_snegas. Comparisons with other molluskivorous fish suggested that the amount of hard-shelled prey H. minckleyi ingests is not unusual, but the mass of its pharyngeal musculature and the force used to crush snails is unparalleled.}, keywords = {cichlid, Cichlid fish, Coahuila, comparison, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, feeding, Fish, habitat, Herichthys minckleyi, individuals, jaw, MEXICO, Morphology, muscle, muscles, pharyngeal, Plant, Plants, Prey, snails, Structure, TEETH, TNHC}, url = {d:\users\dean_h\reprints in pdf or other{\H u}lseyetal2005_Trophic_morph_performance_H_minckleyi.pdf}, author = {Hulsey, C.D. and Hendrickson, Dean A. and Garc{\'\i}a De Le{\'o}n, Francisco J.} } @article {swanson_movement_2005, title = {Do movement patterns differ between laboratory and field suction feeding behaviors in a Mexican cichlid?}, journal = {Environmental Biology of Fishes}, volume = {74}, year = {2005}, pages = {201{\textendash}208}, abstract = {Synopsis We analyzed feeding behavior of individuals of Herichthys minckleyi, the Cuatro Ci{\'e}negas cichlid, under laboratory conditions and freely behaving in their natural environment using high-speed video imaging. In a multivariate analysis of suction feeding behaviors there was no clear grouping of feeding events based on the environment, which suggests that most of the variability in the data was unrelated to differences between lab and field behaviors. In fact, the variability within an environment was far greater than the variability between the two environments. These results suggest that laboratory studies can accurately describe the kinematics of behaviors seen in the field. However, although lab based studies can quantify behaviors seen in the field, natural habitats are complex and provide individuals with the opportunity to exploit a wide range of food types and microhabitats, which may elicit behaviors not observed in the laboratory. However, feeding behaviors observed in the lab are representative of frequently used feeding behaviors in the field, at least for this species. Thus, we suggest that laboratory studies of feeding behavior, particularly those that test biomechanical or performance-based hypotheses can be extrapolated to natural environments.}, keywords = {Coahuila, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, MEXICO}, url = {d:\users\dean_h\reprints in pdf or other\Swanson_lab_vs_field_suction_feeding_minckleyi.pdf}, author = {Swanson, Brook O. and Gibb, Alice C. and Marks, Jane C. and Hendrickson, Dean A.} } @book {hendrickson_proceedings_2005, title = {Proceedings of the First Meeting of Cuatroci{\'e}negas Researchers; Memorias de la Primera Junta de Investigadores de Cuatroci{\'e}negas}, year = {2005}, abstract = {This first meeting of those conducting scientific research in the valley of Cuatroci{\'e}negas, Coahuila, M{\'e}xico and nearby regions was organized for the primary purpose of increasing and improving interactions among the diverse researchers working in the area, and to increase and improve communications between researchers, the management community (both government, NGO and private interests) and the general community of Cuatro Ci{\'e}negas.}, keywords = {Coahuila, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, MEXICO}, url = {http://desertfishes.org/cuatroc/meeting/junta/2004/congreso/Memorias_junta2004_res_alta.pdf} } @book {hendrickson_proceedings_2004-1, title = {Proceedings of the Desert Fishes Council Annual Symposium 2002}, volume = {XXXIV}, year = {2004}, publisher = {Desert Fishes Council}, organization = {Desert Fishes Council}, address = {Bishop, California}, abstract = {The mission of the Desert Fishes Council is to preserve the biological integrity of North America{\textquoteright}s desert aquatic ecosystems and their associated life forms, to hold symposia to report related research and management endeavors, and to effect rapid dissemination of information concerning activities of the Council and its members.}, isbn = {1068-0381}, url = {http://www.desertfishes.org/proceedings/DFC_Vol_XXXIV.pdf}, editor = {Hendrickson, Dean A. and Findley, Lloyd T.} } @book {hendrickson_proceedings_2004, title = {Proceedings of the Desert Fishes Council Annual Symposium 2003}, volume = {XXXV}, year = {2004}, publisher = {Desert Fishes Council}, organization = {Desert Fishes Council}, address = {Bishop, California}, abstract = {The mission of the Desert Fishes Council is to preserve the biological integrity of North America{\textquoteright}s desert aquatic ecosystems and their associated life forms, to hold symposia to report related research and management endeavors, and to effect rapid dissemination of information concerning activities of the Council and its members.}, isbn = {1068-0381}, url = {http://www.desertfishes.org/proceedings/DFC_Vol_XXXV.pdf}, editor = {Hendrickson, Dean A. and Findley, Lloyd T.} } @article {wilcox_convergence_2004, title = {Convergence among cave catfishes: long-branch attraction and a Bayesian relative rates test}, journal = {Molecular Phylogenetics and Evolution}, volume = {31}, number = {3}, year = {2004}, month = {jun}, pages = {1101{\textendash}1113}, abstract = {Convergence has long been of interest to evolutionary biologists. Cave organisms appear to be ideal candidates for studying convergence in morphological, physiological, and developmental traits. Here we report apparent convergence in two cave-catfishes that were described on morphological grounds as congeners: Prietella phreatophila and Prietella lundbergi. We collected mitochondrial DNA sequence data from 10 species of catfishes, representing five of the seven genera in Ictaluridae, as well as seven species from a broad range of siluriform outgroups. Analysis of the sequence data under parsimony supports a monophyletic Prietella. However, both maximum-likelihood and Bayesian analyses support polyphyly of the genus, with P. lundbergi sister to Ictalurus and P. phreatophila sister to Ameiurus. The topological difference between parsimony and the other methods appears to result from long-branch attraction between the Prietella species. Similarly, the sequence data do not support several other relationships within Ictaluridae supported by morphology. We develop a new Bayesian method for examining variation in molecular rates of evolution across a phylogeny.}, keywords = {blindcats, Prietella}, issn = {1055-7903}, doi = {10.1016/j.ympev.2003.11.006}, url = {http://www.sciencedirect.com/science/article/pii/S1055790303004184}, author = {Wilcox, T.P. and Garc{\i}́a de Le{\'o}n, F.J. and Hendrickson, Dean A. and Hillis, D.M.} } @article {hulsey_temporal_2004, title = {Temporal diversification of mesoamerican cichlid fishes across a major biogeographic boundary}, journal = {Molecular Phylogenetics and Evolution}, volume = {31}, number = {2}, year = {2004}, pages = {754{\textendash}764}, abstract = {The Mexican Neovolcanic Plateau sharply divides the vertebrate fauna of Mesoamerica where the climate of both the neotropics 12 and temperate North America gradually blend. Only a few vertebrate groups such as the Heroine cichlids, distributed from South 13 America to the Rio Grande in North America, are found both north and south of the Neovolcanic Plateau. To better understand the 14 geography and temporal diversification of cichlids at this geologic boundary, we used mitochondrial DNA sequences of the cy- 15 tochrome b (cyt b) gene to reconstruct the relationships of 52 of the approximately 80 species of Heroine cichlids in Mesoamerica. 16 Our analysis suggests several cichlids in South America should be considered as part of the Mesoamerican Heroine clade because 17 they and the cichlids north of the Isthmus of Panama are clearly supported as monophyletic with respect to all other Neotropical 18 cichlids. We also recovered a group containing species in Paratheraps + Paraneetroplus+ Vieja as the sister clade to Herichthys. 19 Herichthys is the only cichlid clade north of the Mexican Plateau and it is monophyletic. Non-parametric rate smoothing of cichlid 20 cyt b sequence resulted in an estimated divergence time of approximately 6 million years for Herichthys. This temporal diversifi- 21 cation is concordant with divergence times estimated for anurans in the genus Bufo, a group that exhibits a similar geographic 22 distribution. Our results indicate the 5-million-year-old extension of the Mexican Neovolcanic Plateau to the Gulf Coast of Mexico 23 has strongly influenced the current transition between the vertebrate faunas of the Neotropics and Nearctic}, keywords = {BIOGEOGRAPHY, cichlid, Coahuila, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, Distribution, DNA, fauna, fishes, geographic, Geography, MEXICO, MITOCHONDRIAL DNA, North America, phylogenetics, relationships, Rio Grande, sequence, TNHC}, url = {d:\users\dean_h\reprints in pdf or other{\H u}lsey_etal_2004_Temporal_divers_mesoamerican_cichlids.pdf}, author = {Hulsey, C.D. and Garc{\'\i}a De Le{\'o}n, Francisco J. and S{\'a}nchez Johnson, Yara and Hendrickson, Dean A. and Near, T.J.} } @article {moline_genetic_2004, title = {Genetic variation in a desert aquatic snail (Nymphophilus minckleyi) from Cuatro Ci{\'e}negas, Coahuila, M{\'e}xico}, journal = {Hydrobiologia}, volume = {522}, number = {1-3}, year = {2004}, pages = {179{\textendash}192}, abstract = {Nymphophilus minckleyi is a hydrobiid snail endemic to the freshwater spring ecosystem of Cuatro Ci{\'e}negas, Mexico. We used seven allozyme loci to examine the genetic substructure of N. minckleyi from 14 sites (subpopulations) in the basin and to test the hypothesis that spring pools in Cuatro Ci{\'e}negas are separated into seven hydrologically distinct drainages. Hierarchical F-statistics suggest significant population structure exists among the fourteen populations but not among the seven proposed drainages. Cluster analysis of Nei{\textquoteright}s genetic distance did not show populations grouping according to drainages, although it did reveal alternative clusters. We found two distinct morphotypes that were supported as genetically distinct groups by the allozyme data. Genetic studies of vagile species in desert spring ecosystems can be used to reveal hydrologic connections and identify genetically unique sub-populations.}, keywords = {Coahuila, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, MEXICO}, url = {d:\users\dean_h\reprints in pdf or other\Moline_2004_Nymphophilus_genetics.pdf}, author = {Moline, Angela B. and Shuster, Stephen M. and Hendrickson, Dean A. and Marks, Jane C.} } @unpublished {kloeppel_influence_2003, title = {Influence of the molluscivorous fish, Herichthys minckleyi, on densities of the endemic hydrobiid snail, Mexipyrgus carranzae, in the Cuatro Ci{\'e}negas basin}, year = {2003}, keywords = {Coahuila, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, MEXICO}, author = {Kloeppel, H. and Hendrickson, Dean A. and Marks, Jane C.} } @article {swanson_trophic_2003, title = {Trophic polymorphism and behavioral differences decrease intraspecific competition in a cichlid, Herichthys minckleyi}, journal = {Ecology}, volume = {84}, number = {6}, year = {2003}, pages = {1441{\textendash}1446}, abstract = {Resource polymorphisms, or morphological variations related to resource use, are common in fishes and are thought to be a possible step in speciation. This study experimentally tests the hypothesis that fitness (as estimated by growth rates) is increased by the presence of multiple trophic morphotypes (or morphs) within a population. Cage experiments were used to quantify the intraspecific competitive interactions between morphs of the polymorphic cichlid Herichthys minckleyi in Cuatro Ci{\'e}negas, M{\'e}xico. Results suggest that competition is reduced between morphs in mixed-morph treatments relative to equal-density single-morph treatments. Field studies revealed that the morphs feed in different microhabitats and use different feeding behaviors within these microhabitats. These results suggest that the polymorphism is maintained in the population because it decreases competition between the morphs, and that differences in feeding behavior facilitate resource partitioning.}, keywords = {Behavior, cichlid, Coahuila, competition, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, feeding, FEEDING BEHAVIOR, fishes, fitness, Growth, growth rates, Herichthys, Herichthys minckleyi, interactions, intraspecific, MEXICO, microhabitat, microhabitats, Morphology, Polymorphism, polymorphisms, populations, rates, Resource partitioning, speciation, study, variation}, url = {d:\users\dean_h\reprints in pdf or other\Swansonetal_2003_trophic_polymorphism_behavior.pdf}, author = {Swanson, Brook O. and Gibb, Alice C. and Marks, Jane C. and Hendrickson, Dean A.} } @article {hendrickson_mexican_2003, title = {Mexican native trouts: a review of their history and current systematic and conservation status}, journal = {Reviews in Fish Biology and Fisheries}, volume = {12(2002)}, number = {4}, year = {2003}, pages = {273{\textendash}316}, abstract = {While biologists have been aware of the existence of native Mexican trouts for over a century, they have received little study. The few early studies that did much more than mention their existence began in the 1930s and continued into the early 1960s, focusing primarily on distributional surveys and taxonomic analyses. Starting in the 1980s the Baja California rainbow trout became the subject of more detailed studies, but very little remains known of mainland trouts of the Sierra Madre Occidental. We review earlier studies and report on our own collections and observations made between 1975 and 2000. We present newly discovered historical evidence that leads us to conclude that a {\textquoteleft}{\textquoteleft}lost{\textquoteright}{\textquoteright} cutthroat trout, a lineage not previously known from Mexico, was collected more than a century ago from headwaters of the R{\textexclamdown}o Conchos (a major tributary of the Rio Grande (= R{\textexclamdown}o Bravo)), a basin not previously considered to harbor a native trout. We review the last century of regional natural resource management and discuss our own observations of trout habitats. Impacts of logging, road building and overgrazing are widespread and expanding. Many streams suffer from heavy erosion, siltation and contamination, and though long-term hydrologic data are generally not available, there is evidence of decreased discharge in many streams. These problems appear related to region-wide land management practices as well as recent regional drought. Trout culture operations using exotic rainbow trout have rapidly proliferated throughout the region, threatening genetic introgression and/or competition with native forms and predation on them. Knowledge of distribution, abundance, relationships and taxonomy, not to mention ecology and population biology, of native trouts of the Sierra Madre Occidental remains inadequate. Vast areas of most mainland drainages are still unexplored by fish collectors, and even rudimentary information regarding basic biology, ecology and population structure of stocks remains lacking. Concentrated exploration, research and management of this long overlooked and undervalued resource are all urgently needed. The history of natural resources exploitation that placed so many native trouts of the western United States on threatened and endangered species lists is repeating itself in the Sierra Madre Occidental. Without concerted action and development of region-wide socio-economic solutions for current, largely non-sustainable resource management practices, native Mexican trout gene pools will soon be in grave danger of extinction.}, keywords = {Baja California, Chihuahua, Conchos, conservation, Cutthroat trout, Durango, endangered, ENDANGERED species, genetic introgression, introgression, Mexican trout, Onchorchynchus mykiss, Onchorynchus, rainbow trout, Rio Grande, Sierra Madre Occidental, Sinaloa, Sonora, trout, Truchas Mexicanas, United States}, doi = {10.1023/A:1025062415188}, url = {⬚d:\users\dean_h\reprints in pdf or other\Hendrickson_2003_Mexican_trout.pdf ⬚}, author = {Hendrickson, Dean A. and Espinosa-P{\'e}rez, H. and Findley, L.T. and Forbes, W. and Tomelleri, J.R. and Mayden, R.L. and Nielsen, J.L. and Jensen, B. and Ruiz-Campos, Gorgonio and Varela-Romero, A. and Van Der Heiden, A.M. and Camarena, F. and Garc{\'\i}a De Le{\'o}n, Francisco J.} } @inbook {hendrickson_fishes_2002, title = {Fishes of the R{\'\i}o Fuerte, Sonora, Sinaloa and Chihuahua, M{\'e}xico}, booktitle = {Libro Jubilar en Honor al Dr. Salvador Contreras Balderas}, year = {2002}, month = {nov}, pages = {171{\textendash}195}, publisher = {Universidad Aut{\'o}noma de Nuevo Le{\'o}n, Facultad de Ciencias Biol{\'o}gicas}, organization = {Universidad Aut{\'o}noma de Nuevo Le{\'o}n, Facultad de Ciencias Biol{\'o}gicas}, address = {Monterrey, Nuevo Le{\'o}n, M{\'e}xico}, abstract = {The Rio Fuerte drains 33,835 km2.of the Sierra Madre Occidental of the Mexican states of Chihuahua, Sinaloa, Durango, and Sonora. Its tributaries pass through Barranca del Cobre (Copper Canyon) as they drop from headwaters as high as 2,808 m above sea level to the Mar de Cortes (Gulf of California). Its headwaters interdigitate closely with east-flowing tributaries of the Rio Conchos, an important tributary of the Rio Bravo (Grande), and interior drainages of Chihuahua and Durango, such as the Rio Nazas. The Fuerte shares its fish fauna with these neighboring drainages, and has no endemics. Northernmost tributaries are relatively arid, but southern tributaries drain sub-tropical areas with much higher rainfall. Dams and diversions now block movements of many marine fish species that used to move far upstream, and more are in construction or planned. Large river fish habitats at lower elevations have been converted almost entirely into canals and the natural mainstream channel now carries only minimal or highly modified discharges, often contaminated by agricultural runoff. At higher elevations, fish habitats have been severely impacted by logging and grazing. Logging development continues, recently expanding from traditional conifers to lower-elevation oaks. Exotic fishes have had, or surely will have, broad impacts on the native fauna through predation, competition and hybridization. Tilapias from Africa are widely established now, as are several centrarchids that will undoubtedly impact on the native cichlid (Cichlasoma beani), cyprinids, catostomids, poeciliids, and others. While not well studied taxonomically, the basin{\textquoteright}s native catfish, closely related to Ictalurus pricei, is now broadly hybridizing with introduced channel catfish (I. punctatus). At higher elevations, the beautiful native Mexican golden trout is very likely to hybridize with rainbow trout being widely introduced for fish culture. El Rio Fuerte drena 33,835 km2 de la Sierra Madre Occidental en los estados de Chihuahua, Sinaloa, Durango y Sonora. Sus tributarios fluyen a traves de la Barranca de! Cobre (Copper Canyon) y caen desde las cabeceras de 2,808 m sobre el nivel del mar hacia el Mar de Cortes (Gulf of California). Sus cabeceras interdigitan cercanamente con los tributarios de flujo este del Rio Conchos, un importante tributario del Rio Bravo (Grande) y drenajes interiores de Chihuahua y Durango como el Rio Nazas. El Fuerte comparte su fauna de peces con estos drenajes vecinos y no presenta endemicos. Los tributarios norte{\~n}os son relativamente aridos, pero los tributarios sure{\~n}os drenan areas subtropicales con mayor regimen de lluvias. Las presas y canales, que bloquean ahora el movimiento de muchas especies de peces marinos que lo usaban para remontar el rio, siguen en construcci{\'o}n y planeaci{\'o}n. Los habitats de peces de rios grandes en bajas elevaciones han sido convertidos en canales y el canal principal natural ahora mantiene descargas minimas o altamente modificadas, frecuentemente contaminadas por desechos de la agricultura. A grandes elevaciones, los habitat de los peces han sido impactados severamente por la tala y el pastoreo. Los desarrollo madereros continuan y recientemente se han expandido de las tradicionales coniferas a los encinos de mas baja elevaci6n. Los peces ex{\'o}ticos tienen o seguramente tendran grandes impactos sobre los peces nativos a traves de la depredaci{\'o}n, competencia e hibridaci{\'o}n. Las tilapias de Africa estan ahora ampliamente establecidas al igual que varios centrarquidos, que indudablemente impactan sobre el ciclido nativo (Cich/asona beani), ciprinidos, catost6midos, pecilidos y otros. Aunque no esta bien estudiado taxonomicamente, el bagre nativo de la cuenca, cercanamente relacionado a Ictalurus pricei, esta ahora hibridizandose ampliamente con el bagre de canal introducido. A grandes elevaciones, la hermosa trucha dorada Mexicana nativa, es muy posible que hibridice con la trucha arcoiris, que ha sido ampliamente introducida como pez de cultivo.}, keywords = {Chihuahua, conservation, Ecology, fishes, Mexican trout, Sinaloa, Sonora, threatened, tropical}, isbn = {970-694-199-2}, url = {http://dx.doi.org/10.26153/tsw/8997}, author = {Hendrickson, Dean A. and Varela-Romero, A.}, editor = {Lozano-Vilano, Ma.de Lourdes} } @booklet {mayden_richard_l._sger:_2002, title = {SGER: Biodiversity of Native Mexican Trout (Genus Oncorhynchus spp.) and The Impending Treat of Their Demise by The Exotic Rainbow Trout O. mykiss gairdneri (Teleostei: Salmonidae)}, number = {DEB: 0240184}, year = {2002}, month = {sep}, publisher = {National Science Foundation}, address = {Washington, D.C., U.S.A.}, abstract = {A grant has been awarded to Dr. Richard L. Mayden at Saint Louis University to conduct field and laboratory research in collaboration with other USA scientists and several scientists from Mexico on the environmental status, distribution, conservation and genetics of native trout populations of Mexico. While biologists have been aware of the existence of native trout in Mexico for over a century, they have received little study. Beginning in the mid-1990{\textquoteright}s a group of ichthyologists and conservation biologists from both Mexico and USA jointly formed an international alliance, Truchas Mexicanas, to better understand the native trout of the Sierra Madre Occidental. Through these efforts, scientists have discovered previously unknown trout species restricted to Mexico and introduced (non-native) populations of rainbow trout. The existence of these non-native rainbow trout originating from streams in the US and Canada in the ranges of the unique Mexican trout species is a significant threat to the future existence of native species. Rainbow trout are known to displace native trout species through competition or genetically "swamp out" their gene pools through aggressive hybridization. Other native populations of trout are also predicted to occur in the upper Rio Conchos; these populations are predicted to also be in danger from habitat destruction and introductions of rainbow trout. In this study we will inventory many river systems of the sierras for native and introduced trout species, including the upper Conchos River system. Genetic samples will be examined from all of these populations to evaluate genetic variability of native species and determine if any native populations are compromised genetically through hybridization with introduced rainbow trout. This research supports the development of an international alliance investigating native trout populations of Mexico and southwestern United States. Trout species are important game and forage species for human populations, constituting a major element of diets in some regions. Trout fisheries are also very important economic elements to some regions as trout are highly prized sport fish species. Understanding native trout species diversity in Mexico and its conservation and maintenance in these streams has a major impact on both fisheries and economic areas. Mexican trout species are the southern-most trout and are adapted to theses unique ecosystems. Introductions of non-native rainbow trouts will seriously jeopardize these adapted populations and lead to their extirpation from the region. This will have serious sociological and economic impacts for the native people of the region.}, url = {https://www.nsf.gov/awardsearch/showAward?AWD_ID=0240184\&HistoricalAwards=false}, author = {Mayden, Richard L.} } @article {sneegas_worlds_2002, title = {World{\textquoteright}s Weirdest Catfish}, journal = {In Fisherman}, year = {2002}, keywords = {Satan eurystomus, Trogloglanis pattersoni}, author = {Sneegas, Garold W. and Hendrickson, Dean A.} } @book {hendrickson_proceedings_2002, title = {Proceedings of the Desert Fishes Council Annual Symposium 2001}, volume = {XXXIII}, year = {2002}, publisher = {Desert Fishes Council}, organization = {Desert Fishes Council}, address = {Bishop, California}, abstract = {The mission of the Desert Fishes Council is to preserve the biological integrity of North America{\textquoteright}s desert aquatic ecosystems and their associated life forms, to hold symposia to report related research and management endeavors, and to effect rapid dissemination of information concerning activities of the Council and its members.}, isbn = {1068-0381}, url = {http://www.desertfishes.org/proceedings/DFC_Vol_XXXIII.pdf}, editor = {Hendrickson, Dean A. and Findley, Lloyd T.} } @article {cohen_cuatro_2001, title = {Cuatro Ci{\'e}negas yesterday and today: a look at historic and modern photographs}, journal = {Proceedings of the Desert Fishes Council}, volume = {33}, year = {2001}, abstract = {The Cuatro Ci{\'e}negas valley is home to 16 species of native fishes, 9 of which are endemic. The threat of habitat reduction, degradation, and introductions of exotic species looms over much of the valley and is a constant threat to the continued existence of these species. Understanding patterns of desiccation in the valley can be important for managing water use in the valley and understanding aquifer dynamics. We retook photographs from 12 sites for which historic photographs existed. Some of these photographs are from as far back as the 1920{\textquoteright}s. By comparing historic to modern photographs we will discuss drying in the Cuatro Ci{\'e}negas Basin. It appears that drying has been mainly limited to habitats on the perimeter of the valley while habitats in the center of the valley, at lower altitudes, remain similar to historic conditions. Compared to at least three sites just outside the valley, many sites in Cuatro Ci{\'e}negas still remain relatively pristine. This contribution was supported in part by a grant from the Nature Conservancy to Hendrickson, Marks and Francisco Garc{\'\i}a de Le{\'o}n, and made possible by INE permits to Garc{\'\i}a de Le{\'o}n.}, keywords = {Coahuila, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, MEXICO}, doi = {10.15781/T2QB9VR0N}, author = {Cohen, Adam E. and Hendrickson, Dean A. and Marks, Jane C.} } @article {hendrickson_mexican_2001, title = {Mexican blindcats, genus Prietella (Ictaluridae): an overview of recent explorations}, journal = {Environmental Biology of Fishes}, volume = {62}, number = {1-3}, year = {2001}, pages = {315{\textendash}337}, abstract = {The ictalurid genus Prietella was described from a single locality in northern M{\'e}xico (Coahuila) in 1954, and until very recently went largely unstudied. Cave explorers have recently uncovered new localities and a second species much farther to the south (M{\'e}xico: Tamaulipas). Our team visited over 50 sites, including all of the previously known sites possible, and explored many new sites, expanding the known range of Prietella and describing their habitat. We identified geological units and mapped caves, identified associated troglobitic invertebrates, estimated population sizes and measured water chemistry parameters. We also comment on laboratory diet, parasites, sensory biology, behavior (such as jaw locking and periods of inactivity), reproduction and systematics based on preliminary genetic data. Prietella phreatophila is listed as endangered, and due to the recent discovery of many more sites (formerly documented from three localities, now known from twelve sites, though some are hydrologically connected) we recommend threatened status, with careful attention to growing threats such as over pumping and contamination of the aquifer it lives in. Should these patterns continue unchecked, re-listing this species as endangered may be called for. Prietella lundbergi was also described from one site but is now known from two, though it is quite rare at both (only five specimens have ever been seen). P. lundbergi was described after the most recent revision of the Mexican endangered species list and should probably be considered as endangered.}, keywords = {blindcats, Coahuila, Ictaluridae, Nuevo Leon, Prietella, status, Tamaulipas, TNHC}, doi = {10.1023/A:1011808805094}, url = {http://link.springer.com/article/10.1023/A\%3A1011808805094}, author = {Hendrickson, Dean A. and Krejca, Jean K. and Rodr{\'\i}guez Mart{\'\i}nez, Juan Manuel} } @book {hendrickson_proceedings_2001, title = {Proceedings of the Desert Fishes Council Annual Symposium 2000}, volume = {XXXII}, year = {2001}, publisher = {Desert Fishes Council}, organization = {Desert Fishes Council}, address = {Bishop, California}, abstract = {The mission of the Desert Fishes Council is to preserve the biological integrity of North America{\textquoteright}s desert aquatic ecosystems and their associated life forms, to hold symposia to report related research and management endeavors, and to effect rapid dissemination of information concerning activities of the Council and its members.}, isbn = {1068-0381}, url = {http://www.desertfishes.org/proceedings/DFC_Vol_XXXII.pdf}, editor = {Hendrickson, Dean A. and Findley, Lloyd T.} } @article {stephens_ontogeny_2001, title = {Ontogeny of Cichlasoma minckleyi, the polymorphic Cuatro Ci{\'e}negas cichlid}, journal = {Southwestern Naturalist}, volume = {46}, number = {1}, year = {2001}, pages = {16{\textendash}22}, keywords = {Cichlasoma, Cichlasoma minckleyi, cichlid, Coahuila, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, MEXICO, ontogeny}, author = {Stephens, M.J. and Hendrickson, Dean A.} } @article {williamson_aliens_2001, title = {Aliens invade Mexico: Proof of their impact on native cichlids}, journal = {American Zoologist}, volume = {41}, number = {6}, year = {2001}, abstract = {Abstract of paper presented at Annual Meeting of the Society for Integrative and Comparative Biology, January 02-06, 2002, Anaheim, California, USA - The basin of Cuatro Cienegas, with over 200 springs and pools, lies in the Chihuahuan desert of northern Mexico. The area is a high priority conservation site with many endemic fishes and mollusks. Although geographically isolated, the basin{\textquoteright}s fauna is threatened by invading species. Stable isotope studies using 13C and 15N revealed dietary overlap between juveniles of the endemic cichlid, Herichthys minckleyi, and the invasive cichlid, Hemichromis guttatus. We conducted a field enclosure experiment to examine this interaction using growth rates as the dependent variable. Results showed H. minckleyi juveniles lost weight in the presence of H. guttatus. In contrast, H. guttatus gained weight in the presence of H. minckleyi indicating that H. guttatus could out compete H. minckleyi juveniles. These results provide strong evidence that juvenile H. minckleyi found in habitats with H. guttatus will be negatively affected potentially leading to increased juvenile mortality for H. minckleyi.}, keywords = {Coahuila, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, MEXICO}, url = {d:\users\dean_h\reprints in pdf or other\Williamson_2001_Aliens_invade_Mexico.pdf}, author = {Williamson, C.A. and Marks, Jane C. and Hendrickson, Dean A.} } @article {stephens_larval_2001, title = {Larval development of the Cuatro Ci{\'e}negas cichlid, Cichlasoma minckleyi}, journal = {The Southwestern Naturalist}, volume = {46}, number = {1}, year = {2001}, pages = {16{\textendash}22}, keywords = {Coahuila, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, MEXICO}, url = {d:\users\dean_h\reprints in pdf or other\Stephens_2001_larval_minckleyi.pdf}, author = {Stephens, M.J. and Hendrickson, Dean A.} } @article {hulsey_role_2001, title = {Role of prey functional disparity in maintenance of fish pharyngeal jaw polymorphism (meeting abstract)}, journal = {American Zoologist}, volume = {41}, number = {6}, year = {2001}, pages = {1478}, abstract = {Polymorphism in feeding structure could be rare because it represents an ephemeral and transitional stage in speciation. Alternatively, intraspecific morphological specialization may be latent in many species and only arise in exceptional ecological settings due to distinct functional demands prey place on predators. In order to unravel these hypotheses, we examined diet specialization in the trophically polymorphic cichlid fish Herichtys minckleyi using gut analysis and stable isotopes obtained from fish from eight populations in Cuatro Cienegas in Northeastern Mexico. We found papilliform pharyngeal morphs ate a greater percentage of plants and arthropods compared to molariform morphs. Although snail shell constituted some proportion of the gut contents of all jaw types, papilliform morphs are not often crushing snails. Approximately 90\% of molariform morph guts contained crushed snails and their isotope signatures differed significantly from papilliform morphs. Individuals with intermediate pharyngeal morphologies frequently crushed snails and have stable isotope values between the molariform and papilliform morphs indicating their diets reflect their intermediate dentition. Using the snail opercula found in the guts, we estimated both the number of snails eaten and force used by individual H. minckleyi to crush snails. By quantifying the condition of amphipods, we also assessed the shredding abilities of the pharyngeal morphs. The hardness of the shells of snails inhabiting Cuatro Cienegas will be contrasted with those of other molluscs. Finally, the estimated ontogenetic pharyngeal jaw crushing abilities of H. minckleyi will be compared to other molluscivores.}, keywords = {cichlid, Cichlid fish, Coahuila, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, ephemeral, feeding, Fish, individuals, intraspecific, isotopes, jaw, MEXICO, molluscs, Morphology, Operculum, pharyngeal, Plant, Plants, Polymorphism, populations, predators, Prey, snails, specialization, speciation, Structure}, url = {d:\users\dean_h\reprints in pdf or other{\H u}lsey_2001_Role_prey_maintenance_polymorphism.pdf}, author = {Hulsey, C.D. and Hendrickson, Dean A. and Marks, Jane C. and Cohen, Adam E. and Williamson, C.A.} } @article {hendrickson_clark_2000, title = {Clark Hubbs}, journal = {Copeia}, volume = {2000}, number = {2}, year = {2000}, month = {may}, pages = {619{\textendash}622}, issn = {0045-8511}, doi = {10.1643/0045-8511(2000)000[0619:HPCH]2.0.CO;2}, url = {https://www.asihcopeiaonline.org/doi/abs/10.1643/0045-8511\%282000\%29000\%5B0619\%3AHPCH\%5D2.0.CO\%3B2}, author = {Hendrickson, Dean A. and Stewart, Margaret M.} } @inbook {abell_cavefish_2000, title = {Cavefish and subterranean freshwater biodiversity in northeastern Mexico and Texas}, booktitle = {Freshwater Ecoregions of North America: A Conservation Assessment}, year = {2000}, pages = {41{\textendash}43}, publisher = {Island Press}, organization = {Island Press}, address = {Washington, D.C.}, isbn = {1-55963-734-X}, author = {Hendrickson, Dean A. and Krejca, Jean Kathleen}, editor = {Abell, R.A. and Olson, D.M. and Dinerstein, E. and Hurley, P.T. and Diggs, J.T. and Eichbaum, W. and Walters, S. and Wettengell, W. and Allnutt, T. and Loucks, C.J. and Hedao, P.} } @book {hendrickson_proceedings_2000, title = {Proceedings of the Desert Fishes Council Annual Symposium 1999}, volume = {XXXI}, year = {2000}, publisher = {Desert Fishes Council}, organization = {Desert Fishes Council}, address = {Bishop, California}, abstract = {The mission of the Desert Fishes Council is to preserve the biological integrity of North America{\textquoteright}s desert aquatic ecosystems and their associated life forms, to hold symposia to report related research and management endeavors, and to effect rapid dissemination of information concerning activities of the Council and its members.}, isbn = {1068-0381}, url = {http://www.desertfishes.org/proceedings/DFC_Vol_XXXI.pdf}, editor = {Hendrickson, Dean A. and Findley, Lloyd T.} } @article {williams_endangered_2000, title = {Endangered aquatic ecosystems in North American desert regions, with a list of vanishing fishes}, journal = {Journal of the Arizona-Nevada Academy of Science}, volume = {20}, year = {2000}, pages = {1{\textendash}62}, keywords = {aquatic, aquatic ecosystems, Coahuila, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, desert, ecosystems, endangered, Endangered aquatic ecosystems, fishes, Mexican trout, MEXICO, regions}, author = {J.E. Williams and Bowman, D.B. and Brooks, J.E. and Echelle, A.A. and Edwards, R.J. and Hendrickson, Dean A. and Landye, J.J.} } @article {krejca_recent_2000, title = {Recent investigations of the cave fauna of northern Mexico: The Mexican Blindcat Research Team}, journal = {National Speleological Society News}, year = {2000}, keywords = {blindcats, cave, fauna}, author = {Krejca, J.K. and Taylor, S. and Hendrickson, Dean A.} } @book {hendrickson_proceedings_1999, title = {Proceedings of the Desert Fishes Council Annual Symposium 1998}, volume = {XXX}, year = {1999}, publisher = {Desert Fishes Council}, organization = {Desert Fishes Council}, address = {Bishop, California}, abstract = {The mission of the Desert Fishes Council is to preserve the biological integrity of North America{\textquoteright}s desert aquatic ecosystems and their associated life forms, to hold symposia to report related research and management endeavors, and to effect rapid dissemination of information concerning activities of the Council and its members.}, isbn = {1068-0381}, url = {http://www.desertfishes.org/proceedings/DFC_Vol_XXX.pdf}, editor = {Hendrickson, Dean A. and Garrett, Gary P.} } @conference {dinger_results_1999, title = {Results of an Aquatic Macroinvertebrate Survey of the Cuatro Ci{\'e}negas Basin, Coahuila, M{\'e}xico.}, booktitle = {The Chihuahuan Desert symposium}, year = {1999}, pages = {16{\textendash}17}, address = {Alpine, Texas}, abstract = {The Cuatro Ci{\'e}negas Basin has been surveyed for fish, snails, plants and terrestrial invertebrates, but there has been no published survey of other aquatic invertebrates. We conducted regional surveys of aquatic macroinvertebrates in June and July of 1999 to determine which abiotic and biotic factors influence their distribution and to understand in which habitats they are potentially important components of the food web. Habitats sampled include lagunas, pozas, rios, canals, and springs. Possible endemic species will be presented. Predatory taxa were Odonata and Megaloptera. Herbivorous taxa were primarily Chironomidae, Ephemeroptera, and Amphipoda. Biotic and abiotic factors influencing abundance and distribution will be discussed. The hypothesis that Cuatro Ci{\'e}negas Basin has lower diversity and abundances of aquatic macroinvertebrates than similar aquatic habitats will be considered.}, author = {Dinger, Eric and Marks, Jane and Hendrickson, Dean A.} } @conference {marks_stable_1999, title = {Stable Isotopes Reveal Differences in Diet Among Cichlisoma minckleyi Morphs in the Cuatro Cienegas Basin.}, booktitle = {The Chihuahuan Desert symposium}, year = {1999}, address = {Alpine, Texas}, abstract = {Cichlasoma minckleyi, an endemic cichlid in Cuatro Cienegas, has a trophic polymorphisim. The two common morphs, (detritivore and molluscivore), differ in pharyngeal tooth morphology. Diet studies suggest strong overlap between the morphs. We used stable isotopes to test whether the morphs have different diets. Stable isotopes offer two advantages over diet studies by allowing for large non-destructive samples and providing a temporally integrated assessment of diet. We collected fish from eight habitats and determined their morphology using an otoscope and took a small fin clipping for isotope analysis. Morphs differed in d13C, indicating that they have different food sources, but did not differ in d15N, suggesting that they occupy similar trophic positions. Differences in isotope values among sites did not correlate with the Hemichromis invasion.}, author = {Marks, J.C. and Hungate, B. A. and Hendrickson and Dinger, E.C. and Cohen, A.E. and Stevens, M.J.} } @conference {hendrickson_aquatic_1999, title = {Aquatic Ecosystem Studies in Cuatro Ci{\'e}negas, Coahuila, M{\'e}xico: an Overview.}, booktitle = {The Chihuahuan Desert symposium}, year = {1999}, pages = {18{\textendash}19}, address = {Alpine, Texas}, abstract = {The highly endemic aquatic biota of Cuatro Ci{\'e}negas was thoroughly surveyed 20-30 years ago, but more recent inventories are lacking. Human-induced habitat alterations have continued since these early surveys, but the area was recently protected by federal decree. Hydrologic alterations (primarily water diversions) and recent introductions of exotic fishes and snails will likely impact the aquatic ecosystems. Knowledge of inter-specific and habitatorganism interactions will be needed to formulate management plans. In summer of 1999 we began a re-survey of the aquatic biota and water chemistry and will compare our preliminary results to historic data from museum collections. Stable isotope studies will help us describe foodweb interactions, and in situ experiments will help us understand interactions between exotic and native organisms.}, author = {Hendrickson, Dean A. and Marks, J.C. and Cohen, A.E. and Dinger, E.C. and Stephens, M.J. and D{\'a}vila, J. and Hungate, B. and McCready, R.} } @conference {cohen_habitat_1999, title = {Habitat Preferences of Papilliform and Molariform Morphs of Cichlasoma minckleyi}, booktitle = {The Chihuahuan Desert symposium}, year = {1999}, address = {Alpine, Texas}, abstract = {Cichlasoma minckleyi is a polymorphic cichlid endemic to the Cuatro Cienegas basin in Coahuila Mexico. The two most common morphs (papilliform and molariform) differ in pharyngeal dentition. Understanding how and if morphs segregate among habitat types might prove useful in understanding cichlid diversification, and such information will be necessary for long term management of this species. Fish were captured in Mojarral Oeste (now also called Poza Azul), a clear spring fed pool with at least 5 discrete habitat types, identified by morph, tagged, released, and observed in situ one to two days later. Data were taken on habitat preference and feeding behaviors for each individual. Initial results indicate differences in habitat preferences between morphs. Future observations will encompass other seasons.}, author = {Cohen, Adam E. and Hendrickson, Dean A.} } @booklet {sneegas_scotcat_1998, title = {ScotCat Article: Extreme Catfish}, year = {1998}, keywords = {Satan eurystomus, Trogloglanis pattersoni}, url = {http://www.scotcat.com/articles/article69.htm}, author = {Sneegas, Garold W. and Hendrickson, Dean A.} } @article {botosaneau_collection_1998, title = {On a collection of stigobitic cirolanids (Isopoda: Cirolanidae) from northern Mexico, with description of a new species.}, journal = {Bulletin de L{\textasciiacute}Institut Royal des Sciences Naturales de Belgique}, volume = {68}, year = {1998}, pages = {123{\textendash}134}, abstract = {From caves and springs in northern Mexico (Tamaulipas and Coahuila), mostly explored by diving, seven species of stigobitic and troglomorphic cirolanids were sampled: four species of Speocirolana Bolivar (one of them, interesting in several respects, described s new), the two known species of Sphaerolana Cole \& Minckley, and Cirolanides texensis Benedict. For all six already known species, the localities are new, and aditional information is provided on their morphology, variability, and relationships. With 15 described species, Mexico has a quite remarkable and varied assemblage of subterranean Cirolanidae, pointing to quite diverse marine ancestors.}, author = {Botosaneau, L. and Iliffe, T.M. and Hendrickson, Dean A.} } @article {hendrickson_bagres_1998, title = {Bagres ciegos del genero Prietella del noreste de M{\'e}xico: exploraciones y estudios recientes}, journal = {Abstract: Mexican congress of Ichthyology}, year = {1998}, keywords = {Prietella}, author = {Hendrickson, Dean A. and Krejca, J.K. and Rodr{\'\i}guez Mart{\'\i}nez, J.M. and Garc{\'\i}a De Le{\'o}n, Francisco J. and Hillis, D.M.} } @article {hendrickson_final_1997, title = {Final Project report - Interim progress report on a study of the utility of data obtainable from otoliths to management of Humpback Chub (Gila cypha) in the Grand Canyon}, year = {1997}, month = {jun}, abstract = {This study was initiated with the objective of studying various aspects of the physical and chemical structure of otoliths of humpback chub from the Grand Canyon of Arizona, and primarily from the Little Colorado River (LCR). These studies were to shed light on the utility of otolith studies for improving knowledge of the life history of this endangered species, and to evaluate the potential application of these techniques to questions posed by resource managers. Whole fish specimens, skeletons, or preserved heads of specimens were provided to the author by a diversity of Arizona Game and Fish field crews who collected from 1989 through 1993. The author, with assistance of Dr. Ed Brothers, extracted, prepared and examined otoliths. Data analysis and reporting was the sole responsibility of the author. Specifically, the study was to obtain age estimates (years of age) from otoliths of 50 selected skeletonized adult specimens of Gila cypha collected from the Grand Canyon by Arizona Game and Fish Department in 1989 and 1990. It was also to obtain age estimates (days of age) for 100 selected young-of-the-year (y.o.y.) Gila cypha collected during the same and subsequent years. Age estimates for y.o.y. were predicated on the assumption that increments counted in the otoliths were deposited daily, and that increment counts could thus be translated to days of life since the date of first increment formation (generally within the first few days following spawning). Since that hypothesis had not been specifically tested in this species, the study also was to test the hypothesis that increments form on a daily basis, both in the field and in hatchery experiments. Since at least some humpback chub appear to move across a typically strong thermal gradient at the interface of mainstem Colorado River (MCR) waters and the discharge of the LCR, which is generally much warmer than MCR, it was hypothesized that this transition might lead to the formation of marks, both physical and chemical, in otoliths and that these marks might be used to reconstruct individual life histories with respect to timing of this inter-river movement. Though studies conducted since initiation of the present study \9017\ have recently made significant contributions toward documentation of movements of adult humpback chub in the mainstem Colorado, still very little is known of movements of y.o.y. It had been hypothesized that if swept out of the LCR into the mainstem Colorado, the transition might be lethal or have other deleterious impacts on y.o.y. survival and growth. A mark in otoliths that unambiguously conveyed information about extent and timing of movements across this inter-river interface, could thus be valuable in furthering understanding of population dynamics and movements. It was thus proposed to search for such marks in otoliths and to conduct experiments to study the effects of temperature changes on otolith structure. The original study design also called for an analysis of the feasibility of determining annual growth period duration from otoliths of post young-of-the-year individuals of Gila cypha for all growth periods throughout the life of specimens. At the time of study design, there was considerable discussion and application of chemical analyses of otoliths in the literature of fishery management and stock identification. Studies at this time indicated considerable promise for the techniques, and likely applicability to reconstruction of detailed individual life histories of humpback chub. It was hypothesized that individuals that moved across the MCR-LCR temperature and water quality gradient would deposit a chemical/structural signal in their otoliths that reflected this transtion from one river to the other. Since the temporal structure of otolith deposition and specimen birth date could be recovered from the otoliths as well, the absolute date of the movement event, and fish size at the time, might be accurately recoverable as well. It was therefore proposed to carry out analyses of micro-spatial (=chronological) variation in elemental composition in otoliths of 20 selected individual Gila cypha specimens from the Grand Canyon for evaluation of the utility of such techniques for reconstruction of movement history of individuals. In addition it was hoped to compare total elemental composition among otoliths of 5 selected individual specimens of young-of-the-year Gila cypha captured in the Little Colorado River, otoliths of 5 hatchery-reared young-of-the-year Gila cypha, and otoliths of 5 selected Gila cypha suspected or known to have moved between the Little Colorado River and mainstem Colorado River in the Grand Canyon as a means of investigating the effect of these diverse environments on otolith composition. An accidental spill of isotopes into the LCR drainage \9018\ was thought to potentially provide isotopic signatures in otoliths. If some of the isotopes characteristic of the spill were found in otoliths, their presence might serve as an unambiguous marker indicating time spent in the LCR. It was therefore proposed to determine the isotopic composition of a subsamplc of the same (or comparable) specimens used for microchemical composition studies. Since otolith isotopic composition had been indicated in other studies tu he highly correlated with ambient temperature, isotopic compositional changes during the temporal sequence of otolith deposition thus might also reflect inter-river transitions. Specimens from experiments designed to determine the effects of ambient temperature on otolith increment deposition were therefore to be examined for isotopic composition as well in an attempt to better understand the effect of temperature on isotopic composition of otoliths. In the course of these studies a bibliography of literature relevant to methods and problems of estimating age and growth of Gila cypha and chemical composition of otoliths as related to application of otolith chemistry to reconstruction of the environmental history of individuals was compiled and is provided with this report. Though this bibliography can hardly be claimed to he comprehensive since the literature in this field has become very extensive, it should serve as a starting point for future researchers interested in otolith studies. Finally, the appendices of this report provide an inventory of all specimens of Gila cypha from the Grand Canyon used (and not used) in this study, and the earlier interim report on early results from this study (less the bibliography, which has been updated in this report). Some questions answered in that report, such as comparisons of ageing techniques using the asteriscus and opercle, are not reiterated here, and the figures provided there amply illustrate all otolith structural features and variations discussed in this report.}, doi = {10.15781/T2RJ49B42}, url = {https://repositories.lib.utexas.edu/handle/2152/63183}, author = {Hendrickson, Dean A.} } @article {hendrickson_cuatro_1996, title = {The Cuatro Cienegas Project: Conservation research and education in a small Mexican community}, journal = {Bulletin of the Ecological Society of America}, volume = {77}, number = {(3 SUPPL. PART 2)}, year = {1996}, pages = {193}, keywords = {Coahuila, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, MEXICO}, author = {Hendrickson, Dean A. and Brauer, Matthew J. and Zippin, D.B} } @conference {felger_northern_1995, title = {Northern Sierra Madre Occidental and its Apachian outliers: A neglected center of Biodiversity}, booktitle = {Gen. Tech. Rep. RM-GTR-264. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station. 669 p.}, series = {Gen. Tech. Rep. RM-GTR-264}, volume = {264}, year = {1995}, pages = {370{\textendash}378}, publisher = {U.S. Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station}, organization = {U.S. Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station}, address = {Tucson, Arizona, U.S.A.}, keywords = {Yaqui}, doi = {10.2737/RM-GTR-264}, url = {https://www.fs.usda.gov/treesearch/pubs/32861}, author = {Felger, Richard S. and Wilson, M.V.H. and Burns, B.T. and Dahl, K. and Nelson, Robert H. and Fishbein, M. and Petryzsyn, Y. and Hendrickson, Dean A. and Nabhan, G.P. and Schwalbe, Cecil R. and Suzan, H. and Warshall, P.}, editor = {DeBano, Leonard H. and Ffolliott, Peter H. and Ortega-Rubio, Alfredo and Gottfried, Gerald J. and Hamre, Robert H. and Edminster, Carleton B.} } @book {hendrickson_proceedings_1995, title = {Proceedings of the Desert Fishes Council Annual Symposium 1994}, volume = {XXVI}, year = {1995}, publisher = {Desert Fishes Council}, organization = {Desert Fishes Council}, address = {Bishop, California}, abstract = {The mission of the Desert Fishes Council is to preserve the biological integrity of North America{\textquoteright}s desert aquatic ecosystems and their associated life forms, to hold symposia to report related research and management endeavors, and to effect rapid dissemination of information concerning activities of the Council and its members.}, isbn = {1068-0381}, url = {http://www.desertfishes.org/proceedings/DFC_Vol_XXVI.pdf}, editor = {Hendrickson, Dean A.} } @article {anderson_geographic_1994, title = {Geographic Variation in Morphology of Spikedace, Meda fulgida, in Arizona and New Mexico}, journal = {The Southwestern Naturalist}, volume = {39}, number = {2}, year = {1994}, pages = {148{\textendash}155}, abstract = {Meda fulgida (Pisces: Cyprinidae) is a species endemic to the Gila River basin of Arizona, Mexico, and New Mexico. The extent of geographic variation in morphology within this species has not been explored although evidence indicates that subpopulations have long been isolated. We examined samples from the four restricted areas within the Gila River basin where subpopulations persist, and used principal components analysis, regression against PC1 (to eliminate variation due to size), and ANOVA to demonstrate that individuals from the Verde River (Arizona) have smaller mouths in proportion to body length as compared to individuals from Aravaipa Creek (Arizona). Subpopulations from New Mexico and Eagle Creek in Arizona have intermediate measurements. Additional analyses confirm that females have shorter pre-pectoral measurements, greater mid-body size, and shorter pectoral fins than do males. /// Meda fulgida (Pisces: Cyprinidae) es una especie end{\'e}mica del Rio Gila en Arizona, M{\'e}xico, y Nuevo M{\'e}xico. Lo amplio de la variaci{\'o}n geogr{\'a}phica de la morfolog{\'\i}a de esta especie no ha sido explorada, aunque pruebas indican que subpoblaciones han sido largamente aisladas. Nosotros examinamos muestras provenientes de las cuatro {\'a}reas restringidas dentro del Rio Gila donde persisten subpoblaciones, y usamos an{\'a}lisis de componentes principales, regresi{\'o}n encontra del PC1 (para eliminar la variaci{\'o}n debida al tama{\~n}o), y ANOVA para demonstrar que individuos provenientes Rio Verde (Arizona) tienen la boca m{\'a}s peque{\~n}a en proporci{\'o}n a la longitud del cuerpo en comparaci{\'o}n con individuos provenientes del Arroyo Aravaipa (Arizona). Subpoblaciones de Nuevo M{\'e}xico y Arroyo Eagle (Arizona) tienen una medida intermedia. An{\'a}lisis adicionales confirman que las hembras tienen medidas prepectorales m{\'a}s cortas, mayor tama{\~n}o en la mitad del cuerpo, y aletas pectorales m{\'a}s cortas que los machos.}, issn = {0038-4909}, doi = {10.2307/3672239}, url = {https://www.jstor.org/stable/3672239}, author = {Anderson, Allison A. and Hendrickson, Dean A.} } @book {hendrickson_proceedings_1994, title = {Proceedings of the Desert Fishes Council Annual Symposium 1993}, volume = {XXV}, year = {1994}, publisher = {Desert Fishes Council}, organization = {Desert Fishes Council}, address = {Bishop, California}, abstract = {The mission of the Desert Fishes Council is to preserve the biological integrity of North America{\textquoteright}s desert aquatic ecosystems and their associated life forms, to hold symposia to report related research and management endeavors, and to effect rapid dissemination of information concerning activities of the Council and its members.}, keywords = {Coahuila, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, MEXICO}, isbn = {1068-0381}, url = {http://www.desertfishes.org/proceedings/DFC_Vol_XXV.pdf}, editor = {Hendrickson, Dean A.} } @article {hendrickson_interim_1993, title = {Interim progress report on a study of the utility of data obtainable from otoliths to management of Humpback Chub (Gila cypha) in the Grand Canyon}, year = {1993}, month = {feb}, abstract = {Daily growth increments of otoliths of fishes have been useful in many fishery applications since they have been demonstrated to provide a precise method of ageing individuals and reconstructing individual growth and, possibly, movement or habitat histories. These techniques have not been previously applied to humpback chub, but are believed to have considerable potential for providing knowledge of this difficult to sample and little-understood species. Large temperature and water quality gradients apparently traversed by individuals of this species in the Grand Canyon are of a magnitude likely to produce structural and/or chemical signals in the crystalline calcareous otoliths. If so, since otoliths grow by accretion of daily increments (much like trees develop yearly growth rings), and are stable structures, which unlike scales, are not susceptible to reabsorption except in the most extreme conditions, they retain a structural and chemical chronology of habitats occupied. If the relationships of ambient physical and chemical conditions to otolith structure and composition can be described, a chronology of habitat occupancy and growth for individuals could theoretically be reconstructed with daily precision. Such reconstructions of growth rates, birth dates, movement histories, and possibly, birth place (based on chemistry at otolith formation or during early life), could provide extremely valuable life-history information regarding timing of spawning, cohort recruitment, mortality rates, and data on other population parameters critical for management of this endangered species. The feasibility of using otoliths and opercles of humpback chub for age estimation of individuals has been preliminarily investigated by examining otoliths and opercles from a total of 47 juvenile (ages 0 through 1 +)and 43 adult (estimated ages 2- 23) specimens collected in the Little Colorado River (71 specimens) and mainstream Colorado River (19 specimens) at various places in the Grand Canyon between 1988 and 1992. Studies are continuing, and at this point, due to both sample size and numerous other limitations, and ongoing refinements of techniques, conclusions made here are highly preliminary. Structures prepared and examined included opercles of 35 specimens, one asteriscus from each of 47 specimens and a lapillus from each of 56 specimens. Seventeen specimens were evaluated using all three calcareous structures (lapillus, asteriscus and opercle). The sagitta was also examined, but found to be unsuitable for ageing purposes due to its long, delicate form and irregular increments after the larval/juvenile stage. Additional lapilli have been removed from other available specimens, and a complete inventory of specimens available for further study of calcified structures is provided. Studies of micro-spatial variation in chemical composition of selected lapilli is in progress, using the highly accurate proton probe at the Institute of Geological and Nuclear Sciences in Lower Hutt, New Zealand. This method of analysis shows great promise of overcoming what has been indicated in recent literature to be significant inaccuracies of other techniques (Energy Dispersive X-ray diffraction and Wave Length dispersive X-ray diffraction) used in many of the published studies of microspatial elemental analysis of otoliths.}, doi = {10.15781/T2MS3KJ0X}, url = {https://repositories.lib.utexas.edu/handle/2152/63184}, author = {Hendrickson, Dean A.} } @article {hendrickson_evaluation_1993, title = {Evaluation of the Razorback Sucker (Xyrauchen texanus) and Colorado Squawfish (Ptychocheilus lucius) reintroduction programs in central Arizona based on surveys of fish populations in the Salt and Verde rivers from 1986 to 1990}, year = {1993}, month = {sep}, abstract = {Between 1981 and 1990, more than 11 million hatchery-produced razorback suckers (Xyrauchen texanus) and 750,000 Colorado squawfish (Ptychocheilus lucius) were stocked to historic ranges in the Verde and Salt rivers in Arizona, where natural populations had been extirpated. Efforts to date have focused on broad-scale stockings and general fish surveys to evaluate success. Only 519 razorbacks and 444 squawfish were taken in several years of intensive electrofishing and netting surveys during all seasons throughout large segments of both rivers. Survival of razorbacks appears better in the upper Verde River than in the Salt River, while squawfish appear to fare better in the Salt River than do razorbacks. Most recaptures of either species were taken within weeks of stockings; relatively few individuals were verified to have lived more than a few months in the wild. Large populations of razor backs have not established in mainstreams, although groups have persisted in small, isolated, peripheral habitats where emigration is blocked or impeded. Despite growth to maturity of at least some razorbacks, no evidence of wild reproduction was found. The few squawfish known to have over-wintered in the wild were also taken from a habitat closed to downstream emigration. Proximate impediments to large-scale successful recruitment of stocked individuals to wild populations clearly include predation, principally by exotic flathead catfish and smallmouth bass, and coincident inability of hatcheries to produce large numbers of individuals for release at sizes large enough to escape predation. Despite limited success, it is recommended that stockings of both species continue for two reasons. Large-scale field experiments easily accomplished under the "experimental, non-essential" designation with readily available hatchery fish can elucidate mechanisms of recruitment failure for hatchery stock. These should emphasize experimental analyses of factors affecting mortality, movements and habitat use of stocked fish. Effects of fish condition, transport and stocking stress, size, stocking season, and parasites are other variables which need research. Along with experiments, continued stockings, especially in the case of razorbacks, even with low recruitment rates, appear very likely to contribute to establishment of long-lived populations, and are therefore recommended for both species. Stockings should be as extensive as possible, and focus on releases to closed, peripheral riverine and reservoir habitats (e .g. isolated backwaters), preferably with low or reduced predator populations. While direct stocking of larger individuals would likely increase survival rates in the wild, absolute numbers stocked would remain small given existing facilities . Stockings of far greater numbers of small individuals to such isolated, "wild" habitats and subsequent "wild" growth there prior to release, via either natural or artificial mechanisms, to larger, adjoining habitats, will likely prove to be the most economical and successful approach to establishing multiple, new populations oflong-lived individuals. Recommendations for immediate habitat management actions for both species include manipulations of predator populations and maximization of availability of backwater habitats. A broad-scale, annual field monitoring effort should continue, but most importantly the program should shift to emphasize experimental research. Effectiveness of the reintroduction program could be greatly improved by high-level administrative adjustments with particular attention to development of program objectives, coordination among production, research and monitoring components and frequent evaluation of progress toward objectives.}, doi = {10.15781/T2J679C69}, url = {https://repositories.lib.utexas.edu/handle/2152/61925}, author = {Hendrickson, Dean A.} } @article {hendrickson_peces_1990, title = {Los Peces de la Cuenca del R{\'\i}o de la Concepci{\'o}n, Sonora, M{\'e}xico, y el Estatus del Charalito Sonorense, Gila ditaenia, Una Especie en Amenaza de Extinci{\'o}n}, journal = {The Southwestern Naturalist}, volume = {35}, number = {2}, year = {1990}, pages = {177{\textendash}187}, abstract = {El charalito sonorense, Gila ditaenia, fue incluido como especie amenazada en la lista de especies en peligro de extinci{\'o}n en 1986 por el United States Fish and Wildlife Service. Esta especie, end{\'e}mica de la cuenca del R{\'\i}o de la Concepci{\'o}n cuya mayor parte se encuentra en Sonora, se distibuye en E. U. s{\'o}lo en Sycamore Creek cerca de Nogales, Arizona. Uno de los motivos para considerar a la especie dentro de la lista fue la incertidumbre que exist{\'\i}a en cuanto a su estatus, distribuci{\'o}n y abundancia en M{\'e}xico. El uso de pesca el{\'e}ctrica cronometrada en 17 localidades y el muestreo con redes en ocho ambientes l{\'e}nticos en Sonora, revelaron que el charalito se encuentra empliamente distribuido (16 de las 17 localidades con agua corriente) y es la especie m{\'a}s abundante en biomasa, y con mayor frecuencia num{\'e}rica. A pesar de haber encontrado siete especies ex{\'o}ticas, los peces nativos dominaron en las comunidades de arroyo a lo largo de la cuenca (total en n{\'u}mero = 99.7\%, y biomasa = 96.9\%), mientras que en los represos se encontraron peces ex{\'o}ticos en su totalidad. El estatus de especie amenazada de extinci{\'o}n es apropiado si se considera s{\'o}lo a la poblaci{\'o}n perif{\'e}rica y aislada geogr{\'a}ficamente que existe en Arizona, pero es evidente que hasta la fecha, la especie en general est{\'a} relativamente segura. Las actividades de manejo recomendadas en un futuro pr{\'o}ximo son: monitoreo peri{\'o}dico y an{\'a}lisis taxon{\'o}mico dirigido a las relaciones de la poblaci{\'o}n de Arizona hacia otros demos, y el grado de introgresi{\'o}n gen{\'e}tica con el charalito Yaqui G. purpurea, considerada por el United States Fish and Wildlife Service como especie en peligro de extincti{\'o}n (1984). /// The Sonora chub, Gila ditaenia, was listed as threatened by the United States Fish and Wildlife Service in 1986. This species, endemic to the R{\'\i}o de la Concepci{\'o}n drainage, the major part of which is in Sonora, occurs in the United States only in Sycamore Creek near Nogales, Arizona. One of the motives for listing of the species as threatened was uncertainty regarding its status, distribution and abundance in M{\'e}xico. Use of timed electrofishing in 17 lotic sites and seining in eight lentic habitats in Sonora revealed that the chub is widely distributed (16 of 17 lotic sites) and is the most abundant species in biomass and, frequently, in terms of numbers as well. Despite finding seven exotic fish species, native fishes dominated stream collections throughout the basin (99.7\% of total numbers; 96.9\% of total biomass), while impoundments harbored totally exotic ichthyofaunas. Threatened status is appropriate for Sonora chub if only the peripheral and geographically isolated population in Arizona is considered; however, it is evident that the species in general is presently relatively secure. Recommended future management activities are periodic monitoring and taxonomic analysis directed at determination of relationship of the Arizona population to that of others and the extent of genetic introgression by the endangered Yaqui chub, Gila purpurea (United States Fish and Wildlife Service, 1984).}, issn = {0038-4909}, doi = {10.2307/3671540}, url = {http://www.jstor.org/stable/3671540}, author = {Hendrickson, Dean A. and Romero Ju{\'a}rez, Lourdes} } @article {simons_recovery_1989, title = {Recovery of the Gila Topminnow: A Success Story?}, journal = {Conservation Biology}, volume = {3}, number = {1}, year = {1989}, month = {mar}, pages = {11{\textendash}15}, issn = {1523-1739}, doi = {10.1111/j.1523-1739.1989.tb00218.x}, url = {http://onlinelibrary.wiley.com/doi/abs/10.1111/j.1523-1739.1989.tb00218.x}, author = {Simons, Lee H. and Hendrickson, Dean A. and Papoulias, Diana} } @article {hendrickson_conservation_1989, title = {Conservation status of desert pupfish, Cyprinodon macularius , in Mexico and Arizona}, journal = {Copeia}, number = {2}, year = {1989}, pages = {478{\textendash}483}, abstract = {The authors sampled for fishes at 23 historic and potential Mexican habitats of the endangered desert pupfish, Cyprinodon macularius Baird and Girard. Though pupfish were found at 11 localities, ichthyofaunas of the region were typically dominated by exotics. Desert pupfish was found at two sites from which it had been reported extirpated. One site was found to function as an extensive pupfish refugium from which other species were apparently excluded by water quality. It is concluded that the range of species has been dramatically reduced over the last century by habitat modification and introductions of exotic fishes. Probable continued habitat alterations and limited distribution and population size in natural populations, as well as limited success of reintroduction attempts, require that the species remain considered to be very much endangered}, keywords = {Abstracts, aquatic, arid environments, Arizona, Biological, census, conservation, Cyprinodon, Cyprinodon macularius, desert, Desert pupfish, Distribution, dynamics, endangered, EXOTIC, exotics, Fish, fishes, freshwater fish, function, habitat, Habitat alterations, habitats, introduction, introductions, management, natural populations, NATURE conservation, pollution, population dynamic, Population Dynamics, population size, population status, populations, pupfish, quality, rare species, refugia, Reintroduction, size, status, success, USA, water quality, wildlife, wildlife management}, url = {https://link.springer.com/article/10.1023/A:1025006920052}, author = {Hendrickson, Dean A. and Varela-Romero, Alejandro} } @article {williams_fishes_1989, title = {Fishes of North America: endangered, threatened, or of special concern (1989)}, journal = {Fisheries}, volume = {14}, number = {6}, year = {1989}, pages = {2{\textendash}20}, keywords = {Coahuila, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, endangered, ENDANGERED species, fishes, Fishes of Texas, Fishes{\textendash}Geographical distribution, MEXICO, North America, Rare fishes, Rio Grande, threatened}, author = {Williams, Jack E. and Johnson, James E. and Hendrickson, Dean A. and Contreras-Balderas, Salvador and Williams, James D. and Navarro-Mendoza, Miguel and McAllister, Don E. and Deacon, James E.} } @mastersthesis {hendrickson_geographic_1987, title = {Geographic variation in morphology of Agosia chrysogaster, a Sonoran desert cyprinid fish}, year = {1987}, month = {may}, school = {Arizona State University}, type = {phdPh.D.}, address = {Tempe, Arizona}, abstract = {Morphometric analyses of Agosia chrysogaster (Girard) indicated a northern morph native to Bill Williams, Gila, Sonoyta and de la Concepcion basins of Arizona, New Mexico and Sonora, and a southern form from Willcox Playa of Arizona and Rios Sonora, Yaqui, Mayo, Fuerte and Sinaloa of Sonora and Sinaloa, Mexico. The latter is smaller, and less sexually dimorphic, but has longer pre and postdorsal body lengths. Populations in the geographically intermediate Rios Sonoyta and Sonora are morphologically intermediate. Males differ more between morphs than do females. Meristic characters show considerable overlap between morphs, but the northern form has higher mean lateral line scale counts. Highly tuberculate nuptial males, characteristic of the northern morph, were not found in the south, nor were "spawning" pits characteristic of breeding activities of the former. Morphs differ on a multivariate axis on which temporal variation at single localities is also reflected. Distances among some intra locality samples on this axis were greater than least inter morph distances. Measures of morphological dissimilarity were weakly correlated with inter sample differences in elevation, latitude, and longitude, but more highly correlated with an index of hydrologic isolation among localities. Differentiation among basins thus appears to reflect hydrographic isolation, rather than ecological conditions. Electrophoretic data on A. chrysogaster produced relationships patterns largely incongruent with results of the morphological analyses, and with unexpected geographic area relationships.}, keywords = {Agosia, cyprinids, desert, Fish, geographic, Morphology, morphometrics, multivariate, variation}, url = {http://dx.doi.org/10.26153/tsw/8270}, author = {Hendrickson, Dean A.} } @article {bestgen_movements_1987, title = {Movements and Growth of Fishes in the Gila River Drainage, Arizona and New Mexico}, journal = {The Southwestern Naturalist}, volume = {32}, number = {3}, year = {1987}, pages = {351{\textendash}356}, abstract = {Subadult and adult fishes from the Gila River drainage in New Mexico and Arizona were tagged, released, and recaptured from April 1983 through May 1985. Numbers of tagged and recaptured fish were dominated by desert mountain sucker, Pantosteus clarki, and Sonora sucker, Catostomus insignis. Fishes were presumed to be sedentary as only two of 53 recaptures were made outside of original release sites. The relatively large habitats and comparatively cool thermal regime of the study area are believed to be the primary reasons for the apparent lack of movement. Growth rates of recaptured fishes were low and indicated that desert mountain and Sonora suckers grow slowly after reaching adult size.}, issn = {0038-4909}, doi = {10.2307/3671452}, url = {http://www.jstor.org/stable/3671452}, author = {Bestgen, Kevin R. and Hendrickson, A. and Kubly, Dennis M. and Propst, David L.} } @article {hendrickson_congruence_1986, title = {Congruence of bolitoglossine biogeography and phylogeny with geologic history: Paleotransport on displaced suspect terranes?}, journal = {Cladistics}, volume = {3}, number = {2}, year = {1986}, pages = {113{\textendash}129}, abstract = {A vicariance hypothesis of New World biogeography involving transport of living biota on fragments of an ancestral landmass to present positions ranging from southern Alaska to northern South America is developed. Geological, as well as biogeographical, ecological, and systematic data from plethodontid salamanders provide correlative support for the model. Other groups appear to have similar biogeographic histories and, along with further geological data, could provide means of corroboration of this hypothesis. Active biotic dispersal between the American continents before Pliocene closure of the Panamanian isthmus may have been less prevalent than previously believed, and tectonic transport may have dispersed many organisms. If corroborated, geologists may be provided a new method of analyzing relationships among {\textquotedblleft}suspect terranes{\textquotedblright} using phylogenetic analyses of living biota, and biologists may be required to reassess previous concepts of New World historical biogeography.}, doi = {10.1111/j.1096-0031.1986.tb00447.x}, url = {http://onlinelibrary.wiley.com/doi/10.1111/j.1096-0031.1986.tb00447.x/abstract}, author = {Hendrickson, Dean A.} } @inbook {minckley_geography_1986, title = {Geography of western North American freshwater fishes: description and relations to intracontinental tectonism}, booktitle = {Zoogeography of Western North American Freshwater Fishes}, year = {1986}, pages = {519{\textendash}613}, publisher = {John Wiley and Sons}, organization = {John Wiley and Sons}, address = {New York, NY}, keywords = {description, fishes, freshwater, Geography, Intracontinental tectonism, Mexican trout, Western freshwater fishes}, isbn = {0-471-86419-6}, author = {Minckley, W.L. and Hendrickson, Dean A. and Bond, C.E.}, editor = {Hocutt, C.H. and Wiley, E.O.} } @article {hendrickson_cienegas-vanishing_1985, title = {Ci{\'e}negas-vanishing climax communities of the American Southwest}, journal = {Desert Plants}, volume = {6}, number = {3}, year = {1985}, pages = {131{\textendash}175}, abstract = {The term cienega is here applied to mid-elevation (1,000-2,000 m) wetlands characterized by permanently saturated, highly organic, reducing soils. A depauperate flora dominated by low sedges highly adapted to such soils characterizes these habitats. Progression to cienegais dependent on a complex association of factors most likely found in headwater areas. Once achieved, the community appears stable and persistent since paleoecological data indicate long periods of cienegaconditions, with infrequent cycles of incision. We hypothesize the cienega to be an aquatic climax community. Cienegas and other marshland habitats have decreased greatly in Arizona in the past century. Cultural impacts have been diverse and not well documented. While factors such as grazing and streambed modifications contributed to their destruction, the role of climate must also be considered. Cienega conditions could be restored at historic sites by provision of constant water supply and amelioration of catastrophic flooding events.}, keywords = {cienegas, Climax community, Coahuila, communities, Cuatro Ci{\'e}negas, Cuatroci{\'e}negas, MEXICO, southwest}, doi = {http://dx.doi.org/10.26153/tsw/9234}, url = {https://hdl.handle.net/2152/82229}, author = {Hendrickson, Dean A. and Minckley, W.L.} } @article {hendrickson_new_1984, title = {New distribution records for native and exotic fishes in Pacific drainages of northern M{\quotesinglbase}xico (in English and Spanish)}, journal = {Journal of the Arizona-Nevada Academy of Science}, volume = {18}, number = {2}, year = {1984}, pages = {33{\textendash}38}, keywords = {Chihuahua, Distribution, distribution records, drainage, drainages, Durango, EXOTIC, fishes, NEW, Sinaloa, Sonora, Spanish}, author = {Hendrickson, Dean A.} } @article {meffe_factors_1983, title = {Factors resulting in decline of the endangered Sonoran topminnow Poeciliopsis occidentalis (Atheriniformes: Poeciliidae) in the United States}, journal = {Biological Conservation}, volume = {25}, number = {2}, year = {1983}, pages = {135{\textendash}159}, abstract = {The endangered Sonoran topminnow P. occidentalis has steadily declined in distribution and abundance in the past several decades, and currently survives in the United States only in several isolated localities in southern Arizona. This reduction is correlated with, and primarily attributed to, habitat destruction, and introduction and establishment of mosquitofish Gambusia affinis and other exotic fishes. Topminnows have characteristically been reduced in number or replaced within a year or two of introduction of non-native fishes. Other native fishes have experienced similar declines after introduction of exotics, and much of the endemic western ichthyofauna may be vulnerable to extirpation in this manner. Predation by introduced fishes on natives appears to be a likely mechanism of replacement}, keywords = {Abstracts, Abundance, Arizona, Atheriniformes, Biological, conservation, Distribution, endangered, ENDANGERED species, environmental degradation, environmental impact, establishment, EXOTIC, exotics, Fish, fishes, Gambusia, Gambusia affinis, habitat, interactions, introduced fishes, Introduced Species, introduction, management, Mosquitofish, Native fishes, Poeciliidae, Poeciliopsis, Poeciliopsis occidentalis, population decline, population structure, Predation, RECREATION, reduction, replacement, Sonoran Topminnow, Topminnow, Topminnows, USA, wildlife, wildlife management}, author = {Meffe, G.K. and Hendrickson, Dean A. and Minckley, W.L. and Rinne, J.N.} } @article {hendrickson_fishes_1980, title = {Fishes of the R{\'\i}o Yaqui Basin, M{\'e}xico and United States}, journal = {Journal of the Arizona-Nevada Academy of Science}, volume = {15}, number = {3}, year = {1980}, note = {ArticleType: primary\_article / Issue Title: Fishes of the Rio Yaqui Basin, Mexico and United States / Full publication date: 1980 / Copyright {\textcopyright} 1980 Arizona-Nevada Academy of Science}, pages = {65{\textendash}106}, keywords = {Ictalurus pricei, Mexican trout}, issn = {01938509}, url = {http://www.jstor.org/stable/40025038}, author = {Hendrickson, Dean A. and Minckley, W.L. and Miller, Robert R. and Siebert, Darrell J. and Minckley, Patricia Haddock} } @article {rinne_new_1980, title = {A new Gila Topminnow locality in Southern Arizona}, journal = {U S D A Forest Service,Research Note}, volume = {RM-382}, year = {1980}, pages = {1{\textendash}4}, author = {Rinne, J.N. and Rickel, B. and Hendrickson, Dean A.} } @article {minckley_additional_1979, title = {Additional records for the Pacific Gizzard Shad, Dorsoma smithi (Clupeidae), from Sonora, Mexico}, journal = {Southwestern Naturalist}, volume = {24(4)}, year = {1979}, pages = {683{\textendash}714}, keywords = {Clupeidae, Gizzard shad, Sonora}, author = {Minckley, W.L. and Hendrickson, Dean A. and Siebert, D.J.} }