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 55 for “"Aquatic Habitat"”.
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Temporal variation in stream embeddedness and aquatic habitat
… fine sediment (< 2 mm diameter) can degrade habitat quality for aquatic species leading to declines in biodiversity and loss of ecosystem services. Embeddedness, a metric that quantifies the degree of fine sediment accumulation around coarser particles, has been used by ecologists and …
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Channel Morphology and Riparian Vegetation Influences on Fluvial Aquatic Habitat
… to local (meso- and macro-) in-stream habitat characteristics. This research examined these influences first by examining the influence of complex channel morphology on meso-scale brook trout (Salvelinus fontinalis) habitat in Shenandoah National Park, VA, and then by examining the …
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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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Applying new aquatic habitat data to manage invasive and imperiled crayfishes in North America
… in order to better characterize freshwater habitat in modeling applications. My research applies these new freshwater GIS data layers to species distribution modeling (SDM) with implications for management of both imperiled and invasive freshwater crayfishes. In Chapter 2, I developed SDMs …
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Hydrologic-Based Ecological Risk Assessment of Urban, Agriculture, and Coal Mining Impacts Upon Aquatic Habitat, Toxicity, and Biodiversity
… and coal mining land use/cover impacts upon aquatic habitat, toxicity and biodiversity were investigated in Leading Creek, a 388 km2 watershed in southeastern Ohio. Abandoned strip mine land (ASML) and active deep underground mines were examined along with abandoned near-surface underground …
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Geomorphological Processes in Meandering and Straight Reaches of an Agricultural Stream in East Central Illinois: Relations to Aquatic Habitat
*This dissertation includes a CD that is compound (contains both a paper copy and a CD as part of the dissertation). The CD requires the following application: Microsoft Office.
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Relation of Habitat to Fish Community Characteristics in Small South Dakota Impoundments
Although general habitat characteristics are available for many South Dakota waters, the relation of habitat to fish populations and communities in small South Dakota impoundments has not been extensively researched. Most of the research on small South Dakota impoundments has focused on fish …
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Effects of the aquatic to terrestrial habitat ratio on an amphibian predator and its prey
… the effects of varying the composition of aquatic and terrestrial habitats in a landscape: the aquatic to terrestrial ratio) on amphibians that use both the aquatic and terrestrial habitats during their lives. In Chapter 1, I first used meta-analysis and simulations to demonstrate that as …
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Ecohydrologic Indicators of Low-flow Habitat Availability in Eleven Virginia Rivers
… instream 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 …
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Characterization of Na+/H+Exchanger-3 (Nhe3) in the Gills of Longhorn Sculpin (Myoxocephalus Octodecemspinosus)
… acid-base parameters during changes in an aquatic habitat. Environmental factors such as changes in salinity affect fish ability to maintain optimal blood plasma ion concentrations. Ion regulation influences the fish ability to maintain optimal acid-base balance. The Na+/H+ Exchanger-3 …
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Modeling Low Flow Hydraulics in Alluvial Channels (pools-Riffles, Open)
… determining critical levels of water pollution, aquatic habitat and instream flow needs. To assess these critical conditions, it is necessary to predict the hydraulic response of a river system to a given low flow discharge. Conventional flow models, however, are often inaccurate at low …
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Assessing the Sustainability of Fish Communities in Glacial Lakes: Habitat Inventories and Relationships Between Lake Attributes and Fish Communities
<p>Broad-scale aquatic habitat inventories have rarely been done in South Dakota waters. Even less has been done to understand the relationships between habitat variables and the fish communities in large lakes. The objectives of my research were to: 1) quantify the available aquatic habitats in 15 …
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Habitat Choice and Spatial Ecology of Nerodia Sipedon, the Northern Water Snake
… telemetry to examine the spatial ecology and habitat choice of Nerodia sipedon in a lentic ecosystem in southwestern Missouri. In late spring of 1998, radio transmitters were implanted into 18 adults, which were located daily. Home range areas and shifts in activity centers were calculated …
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Nature based solutions for coastal defense: Wave attenuation and economic analysis of marsh-fronted seawalls
… and the additional ecosystem services, such as habitat, water quality improvement, and carbon sequestration. Both the one-dimensional wave model and benefit-cost analysis framework were applied to an urban marsh-fronted seawall case study at Juniper Cove, Salem, Massachusetts. The presence of …
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Recovery of Channel Morphology and Benthic Macroinvertebrate Assemblages after Livestock Exclusion
… impacts must be implemented to restore aquatic habitat. (Key Words: CREP, stream channel morphology, livestock exclusion, agriculture, benthic macroinvertebrates, riparian buffers.)
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A study of lungs in Rana catesbeiana tadpoles
… was 1:1. This probably correlated with the more aquatic habitat of R. esculenta. In the salamander, Ambystoma maculatum, Hutchison (1963) found that not only is eighty percent of the carbon dioxide produced released through the skin but the skin is also responsible for more than fifty percent of …
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Effects of Temperature on Foraging, Endurance, and Sprint Speed in Agkistrodon Piscivorus and Nerodia Sipedon
… success and locomotion in two sympatric semi-aquatic snakes, the Northern water snake (Nerodia sipedon) and Cottonmouth (Agkistrodon piscivorus). Dietary data for both species from a cold Ozarks stream habitat revealed that A. piscivorus does not consume aquatic prey at this site while N. …
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Mean Flow and Turbulence Characteristics of Pool -Riffle Structures in Low -Gradient Streams
… sediment transport, bed and bank morphology and aquatic habitat are discussed. Some of the results presented in this work have been used as a guide for the design, construction and monitoring of artificial pool-riffle sequences in the West Fork of the North Branch of the Chicago River at …
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American rivers are transporting more sediment in less time
… have direct implications for sediment budgeting, aquatic habitat protection, reservoir and flood-control infrastructure, and the design of best-management practices.
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