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 66 for “"physical habitat"”.
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The effect of depth-velocity correlations on aquatic physical habitat usability estimates
… Methodology permitted consideration of both physical habitat parameters (e.g., depth, velocity, substrate and temperature) and preferences for certain values of these parameters by selected organisms. This methodology was based on the PHABSIM (Physical HABitat SIMulation) computer system, …
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Influence of physical habitat management strategies on sportfish and food-web processes
The addition of habitat structures is a popular management strategy in reservoirs meant to mitigate the negative effects of passive and anthropogenic physical habitat degradation on sportfish populations and angler harvest and satisfaction. However, mechanisms linking the direct effect of habitat …
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Relations between large woody debris, physical habitat, and benthic macroinvertebrates in Appalachian mountain streams
… determine benthic macroinvertebrate relations to physical habitat, and to determine the potential effects of LWD created stream channel alterations on benthic macroinvertebrates. Pool frequency and total surface area increased substantially at the expense of riffles in the random and controlled …
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Short-term response of physical habitat and fish to the addition of large woody debris in two Appalachian Mountain streams
… Creek in southwest Virginia to inlprove fish habitat. The purposes of this study were to monitor stream channel response to the addition of LWD at a stream reach scale and at a local scale around individual logs, to evaluate changes in fish population parameters, and to observe microhabitat …
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Correspondence Between Aquatic Ecoregions and the Distribution of Fish Communities of Eastern Oklahoma
… expanded to include major drainage basins and physical habitat attributes for some areas to adequately partition variance in key measures of biological integrity. Results from canonical correspondence analysis indicated that substrate size and habitat type were the primary physical habitat …
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Local and Systemic Controls on Fish and Fish Habitat in South Dakota Rivers and Streams: Implications for Management
… among geologic-climatic settings in controlling physical habitat and fish communities were better defined. My research approach was based on a premise that assessments of the health of rivers and streams in prairie environments would benefit from studies that 1) examine the moderating effects of …
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Decreasing stream habitat for Greenback cutthroat trout under future climate projections in headwater streams of the southern Rocky Mountains, Colorado
… alterations in stream discharge may affect the habitat requirements for native cutthroat trout species, the suitable physical habitats have not been evaluated under future climate projections for the threatened Greenback Cutthroat Trout (GBCT) occupying the headwater regions in the Southern …
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A Survey of the Fishes and Habitat of the White River, South Dakota
… first comprehensive assessment of the fishes and habitat of the White River in South Dakota. The primary objectives were to 1) document the current species composition, relative abundance, distribution, and condition of fishes, and 2) quantify baseline physical habitat conditions. During July and …
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Habitat Suitability and Availability for Rainbow Trout (Oncorhynchus mykiss) in the Canyon Reservoir Tailrace and Evaluation of Side Scan Sonar for Habitat Mapping in a Semi-Wadable River
… the southeastern United States to mitigate fish habitat and assemblage alterations caused by large impoundments. Hypolimnetic discharges from Canyon Reservoir have created conditions suitable for a coldwater tailrace fishery and trout have been stocked there since 1966. Changes in habitat …
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Ecologically relevant low flows for riverine benthic macroinvertebrates: characterization and application
… relationships between flow regime attributes, physical habitat dynamics and biotic response, particularly for determining environmental flows. While invertebrate response to floods has received most attention, in this thesis the aim was to identify and characterize low flows that constituted …
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Effects of Cattle Exclusion on Stream Habitat in the Shenandoah Valley, Virginia
… to improve riparian vegetation, in-stream habitat, and composition of aquatic organisms. Yet research on the effects of cattle exclusion have yielded conflicting results. The goal of this study was to examine relationships between physical habitat and benthic macroinvertebrate populations …
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Temporal Dynamics of Benthic Macroinvertebrate Communities and Their Response to Elevated Specific Conductance in Headwater Streams of the Appalachian Coalfields
… headwater streams with minimally impacted physical habitat and reference-quality physicochemical conditions (except elevated SC) were sampled ten to fourteen times each for benthic macroinvertebrates between June 2011 and November 2012. In situ loggers recorded SC at 15-minute intervals. …
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Distributions of physical habitats and benthic macroinvertebrates in Western Cape headwater streams at multiple spatial and temporal scales
… (invertebrate) distributions and aspects of the physical habitat at different spatial and temporal scales in mountain and foothill zones of rivers in the Western Cape, South Africa. A geomorphological hierarchy was used as the spatial template for studying invertebrate distributions. The …
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Quantification of the Effectiveness of Agricultural Riparian Buffers to Protect Stream Health in Maryland's Coastal Plain and Piedmont Regions
… IBI (FIBI), benthic IBI (BIBI), and instream physical habitat (PHI). All models indicated that nitrate source terms overshadowed any on-site buffer effects and that Confined Animal Feeding Operations and pastures acted as point sources, overwhelming non-point-source effects. Therefore, …
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Distribution, density, and habitat associations of the narrowly endemic coldwater crayfish (faxonius eupunctus) in the Eleven Point River drainage, Arkansas and Missouri, U.S.
… by a variety of biological, chemical, and physical factors. Detailed distributional and ecological data are lacking for many North American crayfishes, making the assignment of appropriate conservation protection designations difficult. A better understanding of the distribution, population …
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Ecologically Based Methods for Multi-Objective Water Resources Management in Taiwan
… a fish autecology matrix that considers physical habitat, spawning, ecological issues, water quality issues, and human values for Northern Taiwan. By using the matrix analysis method, fish community habitat requirements can be identified. The Taiwan Ecohydrology Index System (TEIS) has …
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Distribution and abundance of nearshore aquatic habitat, Fraser River, British Columbia
Physical habitat for instream biota derives from a combination of stream system structural and hydraulic phenomena. Consequently, the quantity and quality of physical habitat is dynamic both over time and in space along the river, laterally, longitudinally and vertically. Its characterization …
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GEOSPATIAL MODELLING OF PRAIRIE RIVERS: LINKING PHYSICAL INDICATORS OF FISH HABITAT TO LARGE SCALE GEOMORPHIC PATTERNS IN RIVER SYSTEMS USING GEOMORPHIC RESPONSE UNITS (GRU)
… driver defining biological, ecological, and physical habitat characteristics of rivers, a readily applied classification tool that links such characteristics has been lacking. The Geomorphic Response Unit (GRU) method provides a novel approach to identifying large scale patterns in geomorphic …
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The incomplete
… of continuity, or rather, the lack of it, in our physical habitat. At present, the majority of buildings going up are mostly composed and conceived as self-contained / complete entities, that they are coherent wholes standing on their own. Often, the design of . such buildings pays little or no …
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Streams in a changing landscape : identifying candidate reference reaches to assess the physical and biotic integrity of Missouri's wadeable streams
… impacts, describe the ways stressors alter the physical and chemical condition of receiving waters, and predict biological integrity. Thus, the need exists for a flexible, quantitative approach to characterizing stream impairment and identifying candidate least-disturbed stream reaches to serve …
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