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 15 of 15 for “"road crossings"”.
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The effect of road crossings on stream-associated salamanders within Holly Springs National Forest
Road crossings have significant effects on wildlife, but there is limited information on how road crossings affect stream-associated salamanders. Stream-associated salamanders are vital to their ecological communities and are likely to experience the effect of roads more readily than other species …
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DNA-based hair sampling to identify road crossings and estimate population size of black bears in Great Dismal Swamp National Wildlife Refuge, Virginia
… need to identify potential sites for wildlife crossings and estimate the size of the refuge's bear population. I collected black bear hair in order to collect DNA samples to estimate population size, density, and sex ratio, and determine road crossing locations for black bears (Ursus …
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Up an Urban Creek: The Role of Development Patterns in Stream Health
… correlations between infrastructure intensity (road density, number of road crossings, and number of stormwater outfalls) and these response variables. The selected landscape metrics did not explain the variability in the BIBI score. The values in this study may have been within the natural …
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Fish Ladders Designed for Drop Culverts and Central Stoneroller Ecology Across a Latitudinal Gradient
… maintenance of fish assemblage structure. Stream-road crossings can become barriers resulting in a loss of connectivity. Creating innovative tools for fisheries managers to allow fish passage through barrier stream-road crossings is important worldwide as climate change may force range shifts to …
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A system model for source water assessment in the Las Vegas Valley
… used to evaluate the possibility of the major road crossings impacting the drinking water intake; Finally, the model was modified so it can be used for assessing accidental spills at locations near storm channels. (Abstract shortened by UMI.).
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Effects of Stream Crossings on Macroinvertebrate Assemblages of the Upper Current River, Ozark National Scenic Riverways, Missouri
This study examined the impact of road crossings on benthic macroinvertebrate communities in a wadeable Ozark river. I collected macroinvertebrates during winter and summer from four riffle locations (upstream, at crossing, downstream, and farther downstream) at each of five sites in the upper …
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Using GIS and Land Use Data to Select Candidate Reference Sites for Stream Bioassessment
… using land use data sets. These included road and impoundment data from DLGs and Multi-Resolution Land use Consortium data. Land use impairment was measured as percentages of forest, urban, pasture, row crops, and barren area for both the entire catchment and for 10, 40, and 130-m riparian …
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Urban Channel Erosion Quantification in Upland Coastal Zone Streams of Virginia, USA
… but among the Coastal Plain sites, the number of road crossings over streams was the best indicator of channel morphology; and, 3) few significant relationships between enlargement ratios and watershed urbanization variables existed; however, one commonality observed across all sites was an …
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Multiscale Anthropogenic Impacts on Stream Condition and Fish Assemblages in Amazonian Landscapes.
… cover and water temperature, and the impacts of road crossings on channel morphology. Both landscape and instream habitat variables were isolated as having a marked effect on stream fish, but instream habitat differences were shown to be particularly important in explaining patterns of fish …
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Spatial and Temporal Relationships of Adult Male Black Bears to Roads in Northwest Montana, 2003-2004
… Relationships of Adult Male Black Bears to Roads in Northwest Montana Chairperson: Dr. Elizabeth Crone Roads have direct and indirect consequences for wildlife. Vehicle collisions are a direct cost of roads on wildlife. Indirectly, roads may increase mortality of game species by increasing …
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Spatial and Temporal Relationships of Adult Male Black Bears to Roads in Northwest Montana, 2003-2004
… Relationships of Adult Male Black Bears to Roads in Northwest Montana Chairperson: Dr. Elizabeth Crone Roads have direct and indirect consequences for wildlife. Vehicle collisions are a direct cost of roads on wildlife. Indirectly, roads may increase mortality of game species by increasing …
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Modelling Transition Zones and Optimal Design Adjoining Tunnels and Bridges
Track transitions, such as bridge approaches, road crossings, and shifts from slab track to ballasted track, are known to be locations where track degradation accelerates due to dynamic and high impact forces. As a result, there is a higher differential settlement, which can cause an abrupt change …
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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
… increased densities of headwater impoundments, road crossings, and pasture lands. In general, invertebrate metrics showed higher sensitivity to row-cropping and water quality impairment than did fish, particularly in the Ozark Highlands aquatic subregion. We used the results of our …
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Population Fragmentation and Genetic Diversity of Chrosomus sp. cf. saylori (Clinch Dace)
Clinch Dace (Chrosomus sp. cf. saylori) is a newly recognized species of minnow with a restricted distribution in southwestern Virginia. Field sampling and genetic analysis support the hypothesis that Clinch Dace populations are small and fragmented. Analysis of neutral genetic markers shows that …