Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 36 for “"Stream systems"”.
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Evaluation of Ecological Function of Urban Riparian and Stream Systems: Guiding Ecological Restoration in Austin, Texas, USA
… ecosystem function and biodiversity in natural systems impacted by human activities. Restoration of riparian areas is a common recommendation of water management plans today and often deemed necessary to maintain ecosystem sustainability. Assessment of the condition of ecosystems is a critical …
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The Effects of Multiple Stressors on Stream Communities: The Convergence of Drought, Nutrient Pollution, and Invasive Species
<p>Freshwater systems experience multi-faceted degradation from a variety of ecological and environmental stressors. Three common stressors in these systems, drought, nutrient pollution, and invasive species, have wide-ranging effects on stream population- community- and ecosystem dynamics. We have …
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The role of forest stream corridor characteristics in influencing stream and riparian ecology
… PhD thesis seeks to consider conifer forestry stream corridor design in relation to both in-stream and riparian zone biodiversity and functioning. The contribution, availability and source of basal resources within varying corridor conditions are the focus of this project. This approach is …
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Quaternary landscape evolution, pedology, and geoarchaeology in central Texas.
… to historic times through the end of MIS 1, the stream systems have recorded changes as rivers incised and aggraded.
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Quantification and assessment methods for large wood (LW) in fluvial systems
… and ecological important element as it moderates stream power, regulates sediment transport and provides habitat for fish and other living organisms. Besides the beneficial effects of wood in rivers, an abundance of organic material, which is often introduced to waterways by changing climatic …
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Development and evaluation of a stream temperature component within the PRMS watershed modeling program
Stream temperature is becoming a very important factor in water quality and the health of many aquatic ecosystems. Computer modeling software can help predict the response of watershed and stream systems to changes in climate or other conditions. This thesis project concerns the development of a …
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Hyporheic flow in a mountainous riverine system
… hyporheic exchange in peat dominated mountainous streams is needed to better understand stream-floodplain connections and improve our overall conceptual model of water storage and flow through riverine valleys. The objective of this study was to determine the influence of instream beaver dams on …
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Geomorphic Assessment and Flow Modeling of Pearl Darter (Percina aurora) Habitat in the Pascagoula River Watershed
<p>Freshwater ecosystems are complex ecosystems driven by hydrologic, geomorphic, and biological processes. Considering both abiotic and biotic factors is important to understanding resident species habitat. Geomorphology is a known, but often neglected factor in habitat assessment for freshwater …
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Evaluating the Potential Impacts of Municipal Wastewater Effluent on Benthic Macroinvertebrates in the Upper Bow River
… that is commonly released to urban aquatic systems. MWWE is a complex mixture containing nutrients and many emerging chemicals of concern (ESOCs), which may vary due to treatment type, receiving environments, and the population served. Outputs of MWWE have been associated with nutrient …
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Restoring the Lost Rivers of Washington: Can a city's hydrologic past inform its future?
… drained the Federal City. At least three major stream systems—the Tiber Creek, James Creek and Slash Run—and over 30 springs flowed within the boundaries of the emerging capital. The waterways, now buried, were victims of urbanization, and flow now only underground, wreaking havoc on foundations …
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Temporal and longitudinal extent of surface coal mining influences on water quality and benthic macroinvertebrate communities in central Appalachian headwater streams
… coal mining is a common alteration to headwater streams in the central Appalachian region. However, temporal and spatial trends of water quality and associated influences on biota in these stream systems have not been well-studied. To address this research need, I analyzed temporal trends in …
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Effect of Urbanization on the Hyporheic Zone: Lessons from the Virginia Piedmont
… The hyporheic zone is an important part of stream ecosystems, and here we focus on the effect of urbanization on the hyporheic zone from ten first-to-second-order streams within the Virginia Piedmont. We use sediment hydraulic conductivity and stream geomorphic complexity (vertical …
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Fluvial processes, beaver activity, and climate in the greater Yellowstone ecosystem and rock type control on hillslope morphology and soil development in the Sandia Mountains, New Mexico
… historical and natural variability in fluvial systems in the Greater Yellowstone Ecosystem. I used beaver-pond and other fluvial deposits as proxy records of beaver occupation to compare historical fluvial activity to that throughout the Holocene. The Holocene record prior to Euro-American …
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Response of riparian plant communities to hydrological alteration: Are seed banks a means of restoration?
The effects of anthropogenic modifications of stream systems on in situ plant community composition and seed bank composition were examined at five riparian sites in the Yazoo River watershed in northern Mississippi. This analysis was performed to determine if the soil seed bank can provide a means …
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Variation in Salamander Life History and Community Composition Across an Urban Gradient in Atlanta, Georgia, USA
<p>Urbanization threatens to alter stream systems in watersheds in the eastern United States. These highly disturbed systems may result in many local extirpations of sensitive salamander species. One group of organisms that often persists in urban streams is the <em>Eurycea bislineata</em> …
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Habitat Associations Of Stream-Dwelling Salamanders At Multiple Spatial Scales In Central Kentucky Headwaters.
<p>Headwater stream systems are productive habitats that are often at risk of human perturbation, and it is crucial that ecologists understand natural patterns and processes within these ecosystems. Using a multi-scale approach, I investigated factors influencing habitat associations of …
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An Investigation into the Mechanisms of Sludge Reduction Technologies
… there have been numerous pretreatment and side-stream systems studied and developed over the past several decades with the overall goal of reducing the volume of biosolids to be disposed of in landfills or by land application. These technologies can be broken into four large groups: mechanical, …
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Influence of Terrain, Vegetative, and Hydraulic Properties on Sediment and Microplastic Accumulation in the Stroubles Creek Floodplain
Sediment and microplastic accumulation in stream systems occur when particulates entrained in overbank flow are retained by the floodplain. Despite overbank flow conditions dictating sediment and microplastic accumulation, the spatial distribution of accumulation within floodplains remains poorly …
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Stream microbial communities along an agricultural gradient
… Agriculture contributes excess N into stream systems, predominantly as ammonia, which is transformed through nitrification into nitrate by prokaryotes that produce the ammonia monooxygenase enzyme (AMO). The Latah Creek watershed in WA State (USA) drains approximately 1178 km², of …
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Riparian resilience in the face of interacting disturbances: understanding complex interactions between wildfire, erosion, and beaver (Castor canadensis) in grazed dryland riparian systems of low order streams in North Central Washington State, USA
<p>Riparian systems of low order streams in the western United States (US) provide critical ecosystem functions and services such as diverse habitat for numerous species, flood attenuation and essential water storage in water limited environments. These systems have experienced long term …
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