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Showing 1 to 13 of 13 for “"Comal"”.
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Speleogenesis in Comal County, Texas
Caves in Corral County, Texas, were examined with regard to their lithologic and geomorphic setting, paying particular attention to controls such as stratigraphic variation, topography, jointing, and ground-water flow. In the light of these data, a new classification of caves is proposed based upon …
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Exploring Eastern Musk Turtle (Sternotherus odoratus) Population Dynamics and Phenotypic Plasticity in Comal Springs, Texas
Freshwater turtles are vital to aquatic ecosystems but are increasingly affected by anthropogenic change. The eastern musk turtle (Sternotherus odoratus) is a small, omnivorous species inhabiting spring systems in Central Texas, where invasive gastropods have become abundant. This study …
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Understanding key factors influencing habitat quality for the endangered fountain darter (Etheostoma fonticola) in the Comal River.
The research in this thesis was divided into 3 main studies that took place in Landa Lake: water column, sediment, and plant nutrient analyses, an herbivory and soil fertility experiment, and a spatial study of diel dissolved oxygen dynamics. Nutrient data were collected via water samples, nutrient …
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Establishing Patterns in Vegetation Associations of the Fountain Darter Etheostoma fonticola in the San Marcos and Comal Rivers of Texas
… only in spring systems of the San Marcos and Comal rivers in central Texas, is reported to associate with vegetation for feeding, reproduction, and refuge. Descriptions of associations with vegetation range from preferred to exclusive, whereas other studies describe Fountain Darters found …
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Effects of a Textile Mill Effluent and a Low Water Dam on Benthic Macroinvertebrate Community Structure of the Guadalupe River in Comal County, Texas
Nine sites were sampled monthly from December 1993 through November 1994 to assess the impacts of treated wastewater from a textile mill and a low water dam on the benthos of the Guadalupe River in New Braunfels, Texas. A Hess bottom fauna sampler and a ponar dredge were used to take samples of …
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Water From a Stone: The Limits of the Sustainable Development of the Texas Edwards Aquifer
… central Texas as the minimum discharges from Comal Springs in New Braunfels, Texas, and San Marcos Springs, in San Marcos, Texas. This conflict is aggravated by periodic droughts that increase the demand for water, while reducing recharge. This research demonstrates that in the fall, …
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Effects of Turbidity on Anti-Predator Response and Foraging Behavior in the Fountain Darter, Etheostoma fonticola
… clear, spring-fed waters of the San Marcos and Comal Rivers. These rivers are currently subject to a number of anthropogenic threats that may affect turbidity such as pollution, climate change, and increased recreational use. I tested the affects of clear water and low (~30 NTU) turbidity on …
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Population Genetics and Conservation of Texas Hill Country Eurycea
… with no evidence of population decline. The Comal Springs population had the largest estimated population size and appears to be growing. I also examined genetic variation and structure within the San Marcos Springs Eurycea population (E. nana) and between this wild population and the refuge …
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Effects of Extreme Flow Events on Community Composition and Habitat Complexity of Groundwater Dominated Systems
… stable rivers in Texas (San Marcos and Comal rivers) using a 9-year dataset. Habitats (N = 4,863) within 12 reaches of the rivers were categorized as high, moderate, or low complexity along a depth, vegetation, substrate, and current velocity gradient. Following or during extreme flow …
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The Trophic Status of a Deep-Storage Reservoir in Central Texas
No abstract prepared.