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 64 for “"habitat availability"”.
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Ecohydrologic Indicators of Low-flow Habitat Availability in Eleven Virginia Rivers
… uses including ecosystem services and aquatic habitat. A standard method of evaluating impacts of alternative water management scenarios on instream habitat is Instream Flow Incremental Methodology (IFIM). The primary outputs of IFIM studies are: 1) habitat rating curves that relate habitat …
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Conservation of Grassland Birds in an Agricultural Landscape: The Importance of Habitat Availability and Demography
The results from this study suggest that the creation of small grassland complexes within an agricultural matrix is an effective conservation strategy. Furthermore, the results underscore the importance of understanding how life history traits influence population demography and emphasize the …
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Mimicking Nature: How water level management on a large reservoir affects walleye (Sander vitreus) spawning habitat
… spawning, I modeled wave energy, ice scour, and habitat availability at 44 spawning locations. Wave energy increased (18% for observed water levels, 6% for modeled water levels) and ice scour decreased 11% (both P < 0.01) over spawning habitat during the most recent rule curve. Observed water …
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Investigating the great crested newt landscape in a pond rich environment : developing a landscape scale management perspective
… graph theoretic analysis of connectivity and habitat availability for landscape scale management of Triturus cristatus, the Great Crested Newt. The ecological foundations of wider landscape management concepts and knowledge base on T. cristatus' habitat requirements, dispersal and migration …
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Seasonal Use of Conservation Reserve Program Fields By White-Tailed Deer in Eastern South Dakota
… that in low use areas during each season. Pooled habitat availability within deer home ranges was similar between seasons. Habitat use varied among seasons (P < 0.01) and was disproportional to habitat availability (P < 0.10). Overall, CRP lands were used in greater proportions than their …
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A Test of the Area of Refuge Hypothesis in Indo-Pacific Marine Biogeography
… One of these hypotheses suggests that available habitat area is the main predictor of species richness. This is the basis for the area of refuge hypothesis that attempts to explain the global maxima of species richness found in the Coral Triangle, the area encompassing mostly the Philippines, …
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Habitat tools for assessing instream-flow needs for fishes in the upper Roanoke River, Virginia
… in speciose, warmer-water streams. This included habitat and fish data sets for the upper Roanoke River (URR) in southwestern Virginia, collected during the warmer, low- f low seasons of 1989-1991. Physical data were collected in small, rectangular quadrats or crosssectional transacts, whereas …
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Distribution, growth, and transport of larval fishes and implications for population dynamics
… with greater population connectivity amongst habitat patches, while the evenly-distributed vertical behavior and downward ontogenetic vertical migration were similar to one another and led to greater retention near natal sites. However, hydrodynamics and habitat availability created some local …
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Intertidal mudflats and the conservation of migratory shorebirds
Migratory shorebirds rely on intertidal habitats that are increasingly threatened by habitat loss, human disturbance, and climate change. Investigating habitat availability, its influence on shorebird populations and how to prioritise conservation efforts is critical to inform conservation …
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Environmental Factors Influencing Spring Migration Chronology of Lesser Scaup (Aythya affinis)
… are known to influence thermoregulation and habitat availability for waterfowl. Migration chronology of lesser scaup and mallards differed suggesting surveys designed for mallard migration may be biased for scaup. My thesis provides insight into how environmental factors and annual variation …
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Atmospheric and spatial drivers of egg abundance in beach nesting shorebirds across an urban-coastal gradient of the Rockaway Peninsula, New York
… among flooding risk, predator detection, habitat availability, and disturbance. A Poisson generalized linear model identified maximum temperature as the dominant factor associated with egg abundance, showing a consistent negative relationship. Elevation had a significant and positive but …
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Biogeography and ecology of African waterbirds
… latitudinally. Spatia-temporal variation in habitat availability and quality are the primary factors which control waterbird distribution, and the dynamic nature of waterbird dispersion is an adaptation to dramatically fluctuating habitats. About 69% o£ the variance in African waterbird …
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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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Hydromorphological evolution of a restored river; a case study in the Upper River Eden catchment
… (at the centimeter scale), used to characterise habitat, assess sediment and sediment flux within the restored reach. The results show rapid initial response; erosion and deposition at the site show rates in line with levels expected of an active meandering system. Hydraulic modelling and habitat …
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Population Dynamics of Threatened Piping Plovers on the Niobrara River, Nebraska
… of the Great Plains, USA, provide important habitat for the federally threatened piping plover (“plover”, Charadrius melodus). Plovers nest on open to sparsely vegetated river sandbars, and their demographic rates are closely linked to habitat availability and quality, as well as river flow. …
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Habitat Use, Movements, and Exploitation of Striped Bass and Hybrid Striped Bass in Claytor Lake, Virginia
… Claytor Lake, Virginia. This study assessed: 1) habitat use versus habitat availability for STB and HSB; 2) seasonal movement patterns, movement rates, and emigration rates of STB and HSB; and 3) angler catch rates of STB and HSB in Claytor Lake. In general, STB and HSB used similar habitats …
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Longitudinal Variation in Fish Community Along the Upper Green River Below the Green River Lake
… variation in flow and temperature, reduce habitat availability, and decreased mean temperature below a reservoir. These types of alterations can influence fish communities. Twelve sites were sampled along the Upper Green river in order to address the potential influence of impoundment on …
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The variable contribution of larval habitats on the production of mosquitoes that transmit West Nile Virus: a landscape epidemiology approach
… including weather, landscape types, and habitat availability. Much of the focus of public health actions related to the reduction of mosquito-borne pathogens is on the reduction of mosquito populations through treatment or elimination of larval habitats associated with vector mosquitoes. …
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Aspects of municipalities associated with occupancy of Chimney Swifts and Common Nighthawks in Illinois
… America. While causes of declines are unknown, habitat availability is likely a contributing factor. Both species breed in urban areas. Chimney Swifts historically nested in tree cavities but now primarily nest in masonry chimneys, while nighthawks nest on both gravel rooftops and bare ground in …
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