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Competition And Predation: Interactions Between American Eels (Anguilla Rostrata) And Brook Trout (Salvelinus Fontinalis) In Virginia Mountain Streams, Jonathan Studio
Competition And Predation: Interactions Between American Eels (Anguilla Rostrata) And Brook Trout (Salvelinus Fontinalis) In Virginia Mountain Streams, Jonathan Studio
Masters Theses, 2010-2019
Competition has played a large role in structuring natural communities, especially with regards to vulnerable organisms. Brook trout and American eel populations have declined in the Mid-Atlantic Region of the United States as a result of anthropogenic development around freshwater ecosystems, and thus, subsequent conservation efforts of both species have included habitat restoration. Conservation efforts have increased the co-occurrence of these predatory fish species that are known to require similar resources. The main objective of this research was to elucidate the potential for competition between brook trout and American eels through analysis of their preferred prey, diet overlap, and supplementary …
Effects Of Fine Sediment On Juvenile Brook Trout Habitat Use And Social Interactions, Kyle Snow
Effects Of Fine Sediment On Juvenile Brook Trout Habitat Use And Social Interactions, Kyle Snow
Masters Theses, 2010-2019
Streambed sedimentation is a persistent cause of impairment to the ecological condition of streams. The objectives of this study were to investigate 1) the effects of sedimentation and temperature on the use of streambed cover as a velocity refuge by juvenile brook trout in simulated winter flood conditions and 2) the effects of sedimentation, temperature, and time of day on cover use and social interactions of brook trout cohorts in low flow summer water conditions. Using artificial stream channels, experiments were conducted with wild juvenile brook trout collected from the North Fork Tye River, Nelson County, VA. Brook trout did …
Food Web Subsidies In Intermittent Streams: Implications For Small Isolated Populations Of Native Brook Trout, Jennifer Lauren Courtwright
Food Web Subsidies In Intermittent Streams: Implications For Small Isolated Populations Of Native Brook Trout, Jennifer Lauren Courtwright
Masters Theses, 2010-2019
Recent studies in perennial streams have shown that reduction of stream-side vegetation can reduce terrestrial invertebrate inputs to streams and can cause trophic cascades throughout aquatic and terrestrial food webs; however, aquatic-terrestrial food web linkages have not been studied in intermittent streams. Food webs in intermittent streams may be even more dependent on terrestrial invertebrate fluxes because of limited aquatic invertebrate resources; thus intermittent streams may represent unique systems that warrant special attention. The objective of this research was first to quantify the abundance, biomass, and energetic content of available brook trout and insectivorous stream-side predator invertebrate resources in two …
Sensitivity And Exposure Of Brook Trout (Salvelinus Fontinalis) Habitat To Climate Change, Bradly Allen Trumbo
Sensitivity And Exposure Of Brook Trout (Salvelinus Fontinalis) Habitat To Climate Change, Bradly Allen Trumbo
Masters Theses, 2010-2019
Predicting coldwater fisheries distributions under various climate scenarios is of interest to many fisheries managers and researchers. Larger scale models have been useful in highlighting the potential large scale threat. However, the error associated with these models makes predictions of the persistence of individual cold water fisheries problematic. Most of this error is associated with predicted air and water temperatures which typically are simple elevation and location (latitude/longitude) models with simple caveats such as 1°C increase in air temperature equals 0.8°C increase in water temperatures. I directly measured paired air and water temperatures in watersheds containing reproducing populations of brook …
Changes In Light Levels With Loss Of Eastern Hemlock (Tsuga Canadensis) At A Southern Appalachian Headwater Stream: Implications For Brook Trout (Salvelinus Fontinalis), Leigh A. Siderhurst
Changes In Light Levels With Loss Of Eastern Hemlock (Tsuga Canadensis) At A Southern Appalachian Headwater Stream: Implications For Brook Trout (Salvelinus Fontinalis), Leigh A. Siderhurst
Masters Theses, 2010-2019
The exotic invasive insect, hemlock woolly adelgid (Adelges tsugae Annand), is causing mortality in eastern hemlocks (Tsuga canadensis [L.] Carr.) throughout the eastern U. S. Hemlocks are being replaced by hardwood species that cannot fill the structural and functional role of hemlock in forest ecosystems. Because hemlocks produce dense shade, their loss may increase understory light levels. In the southern Appalachians, increases in understory light could cause changes in stream ecosystems because riparian hemlocks may help maintain cool stream temperatures for cold water species such as brook trout (Salvelinus fontinalis). I studied changes in light levels with eastern hemlock decline …