scholarly journals Nitrate concentrations and potential sources in the Barton Springs segment of the Edwards aquifer and its contributing zone, Central Texas

Fact Sheet ◽  
2011 ◽  
Author(s):  
Barbara Mahler ◽  
MaryLynn Musgrove ◽  
Chris Herrington
Keyword(s):  
Edwards Aquifer ◽  
Potential Sources ◽  
Nitrate Concentrations ◽  
Central Texas ◽  
Barton Springs

scholarly journals Phenotypic Variation in Endangered Texas Salamanders: Application of Model-Based Clustering for Identifying Species and Hybrids

Diversity ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 297
Author(s):  
Donella M. Strom ◽  
Nathan F. Bendik ◽  
Dee Ann Chamberlain ◽  
Jessica A. Watson ◽  
Jesse M. Meik
Keyword(s):  
Small Body ◽  
Edwards Aquifer ◽  
Aquifer System ◽  
Model Based Clustering ◽  
Model Based ◽  
Body Sizes ◽  
Central Texas ◽  
Microgeographic Variation ◽  
Population Substructuring ◽  
Barton Springs

The endangered Barton Springs and Austin blind salamanders (Eurycea sosorum and E. waterlooensis, respectively) are micro-endemics to the Barton Springs segment of the Edwards Aquifer and its contributing zone in Central Texas. Although vertically segregated within the aquifer system, both species are known from the same spring outflows and occasionally hybridize. We used geometric morphometrics and model-based clustering applied to a large sample of standardized salamander photographs to evaluate the potential for objective phenotypic assignment to either species, as well as putative hybrids. In addition to characterizing variation in head shape, our analyses inferred sets of clusters corresponding to ontogenetic series in both species but did not infer any distinct hybrid clusters. Eurycea sosorum and E. waterlooensis have distinctive head size to trunk length allometries, which contributed to the effective clustering of species, even at small body sizes. We also observed subtle, but significant, microgeographic variation in E. sosorum, suggesting the possibility of population substructuring, phenotypic plasticity, or undetected hybridization.

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