scholarly journals Recent (2008-10) water quality in the Barton Springs segment of the Edwards aquifer and its contributing zone, central Texas, with emphasis on factors affecting nutrients and bacteria

2011 ◽  
Author(s):  
Barbara Mahler ◽  
MaryLynn Musgrove ◽  
Thomas L. Sample ◽  
Corinne I. Wong
Keyword(s):  
Water Quality ◽  
Edwards Aquifer ◽  
Factors Affecting ◽  
Central Texas ◽  
Barton Springs

scholarly journals Recent (2003-05) water quality of Barton Springs, Austin, Texas, with emphasis on factors affecting variability

2006 ◽  
Author(s):  
Barbara Mahler ◽  
Bradley D. Garner ◽  
MaryLynn Musgrove ◽  
Amber L. Guilfoyle ◽  
Mohan V. Rao
Keyword(s):  
Water Quality ◽  
Factors Affecting ◽  
Barton Springs

Mitigation of Impacts to Groundwater Quality from Highway Runoff in a Karst Terrain

2018 ◽  
Vol 2672 (39) ◽  
pp. 61-67
Author(s):  
Michael E. Barrett
Keyword(s):  
Water Quality ◽  
Groundwater Quality ◽  
Quality Data ◽  
Stormwater Treatment ◽  
Edwards Aquifer ◽  
Sand Filters ◽  
Water Quality Data ◽  
Karst Terrain ◽  
Treatment Practices ◽  
Barton Springs

There is a concern that urban development and the construction and operation of highways in particular represent a substantial threat to groundwater quality in areas underlain by karst geology. The objective of this paper is to determine whether common stormwater treatment practices are effective at preventing adverse impacts. The Barton Springs portion of the Edwards Aquifer, a karst system in Central Texas, presents a unique opportunity to address this issue, in that stormwater treatment requirements have been in place over a period of 20 years, when a substantial amount of development, including new highways, has been undertaken. This paper analyzes water quality data from Barton Springs over this period to identify constituents that exhibit changes in concentration and identifies potential causes of these changes. This analysis indicates that the constituents for which water quality has exhibited degradation appear to be due mainly to increases in pumping for water supply and onsite disposal of wastewater. No changes in constituent concentrations were observed for those most closely associated with highway operation, including total suspended solids, heavy metals, pesticides, and bacteria. It was found that sand filters produce an effluent quality equal to or better than runoff from undeveloped land. Consequently, it can be concluded that sand filtration, or an equivalent treatment, is an effective strategy for preventing groundwater degradation from highway operation in karst terrains.

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.

Water quality in south-central Texas, 1996-98

Circular ◽  
2000 ◽  
Author(s):  
Peter W. Bush ◽  
Ann F. Ardis ◽  
Lynne Fahlquist ◽  
Patricia B. Ging ◽  
C. Evan Hornig ◽  
...  
Keyword(s):  
Water Quality ◽  
South Central ◽  
Central Texas
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