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 40 for “"Biotic communities"”.
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Impacts of aquaculture effluent on water quality and biotic communities in Virginia headwater streams
… water quality at the other farms. The Index of Biotic Integrity (IBI), based on fish community metrics, did not correspond to the RBP, and reflected poor water quality at C and D. Low fish species richness and abundance in these headwater streams limited the usefulness of the IBI. The proposed …
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Relationships Between Streamside Management Zone Width and Biotic Communities of Headwater Streams in West Virginia
… intensity required to maintain water quality and biotic communities is limited. The goal of this study is to evaluate the efficacy of different SMZ widths and forest harvesting intensities within SMZs, in maintaining the water quality and biotic communities of 22 headwater streams located in the …
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The role of dispersal networks in structuring biotic communities: A tale of streams and metacommunity theory
… the processes and mechanisms that govern communities of organisms is the main goal of community ecology. Locally operating mechanisms such as environmental filtering, in which the environment determines what species are found in a given location, as well as regional processes such as …
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A Biological Assessment of the Fish and Benthic Macroinvertebrates From Two Urban Streams in Springfield, Missouri
This study assessed the health of two biotic communities in Jordan and Galloway Creeks in Springfield, Missouri. Fish and benthic macroinvertabrate samples were collected from each stream using the U.S. Environmental Protection Agency’s Rapid Bioassesment Protocols for Use in Wadeable Streams and …
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Mechanistic underpinnings of lacustrine brGDGT production, and proteomic vertebrate taxonomic identification of phrynosomatid lizards and arvicoline rodents
… and the impacts of climatic shifts on biotic systems serve to inform our understanding of these same issues today and into the future. Accuracy in paleoecological studies is therefore crucial to correctly characterizing biotic communities of the past so that we can better understand how …
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Spring-fed streams in Virginia and assessment of livestock impacts
The first of two studies surveyed fish communities and habitats in first-order spring streams in Virginia. Springs exhibited low species (3.3) and trophic guild (2.5) richness, and fish densities averaged 0.47 individuals/m². Two species, blacknose dace (Rhinichthys atratulus) and sculpins (Cottus …
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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
… ion matrix, and benthic macroinvertebrate communities in 24 headwater streams, including 19 influenced by surface mining, from 2011-2019. There was limited evidence of recovery of water chemistry or macroinvertebrate communities in these streams, indicating lasting impacts from surface coal …
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Diagnosis of physical and biological controls on phytoplankton distribution in the Gulf of Maine-Georges Bank region
The linkage between physics and biology is studied by applying a one-dimensional model and a two-dimensional model to the Sargasso Sea and the Gulf of Maine- Georges Bank region, respectively. The first model investigates the annual cycles of production and the response of the annual cycles to …
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The influence of intraspecific variation in host plants on arthropod and fungal endophyte communities
… has been linked to variation in plant-associated biotic assemblages and ecosystem function. However, in many cases, the phenotypic variation associated with influential genetic variation is unknown. In particular, which traits represent ecological filters that can shape assembly of associated …
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Water quality and biotic community response to an urban – rural land-use gradient in the Lake Simcoe watershed
… derived stressors have on water quality and biotic communities requires further investigation. The research presented here explored the links between land-use, periphyton nutrient content and biomass, and invertebrate response in lotic surface waters in the LSW. To infer the contribution of …
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The impact of land use on biodiversity in xeric succulent thicket, South Africa
… the dynamics of landscapes, land elements and biotic communities in Xeric Succulent Thicket, a notoriously fragile and low resilience ecosystem in the Eastern Cape, South Africa. In its natural state this vegetation type is characterized by a continuous mosaic of clumps of diverse woody shrubs …
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Assessing nearshore water quality and biological condition in the Kawartha Lakes using a community science approach
… the relationships between land use and the abiotic and biotic condition of the nearshore zone in the Kawartha Lakes. To examine Lake Scugog’s nearshore water quality patterns and relationship with land use, 12 volunteers collected water samples from spring to fall for three years. Land use …
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Biotic Integrity and Northern Pike Ecology in Eastern South Dakota
… and services in streams are impaired when their biotic communities are degraded by anthropogenic stressors. An index of biotic integrity (IBI) translates community structure into a standardized stream health score. Documenting stream health is important in the Northern Glaciated Plains (NGP) …
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Identification and incorporation of quantitative indicators of ecosystem function into single-species fishery stock assessment models and the associated biological reference points
… management requires baseline information on the biotic communities and an understanding of the interactions among species. The two objectives of this study were to describe the demersal fish community (DFC) associated with the northwestern Gulf shrimp trawl fishery, and to utilize a multispecies …
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Assessing the influence of low head weirs and low head ‘on weir’ hydropower on the phytobenthic biofilm
… alter the aquatic environment, change natural biotic communities and cause failure to comply with WFD targets. On the other hand, as low head ‘on weir’ schemes are fitted on existing weirs which have already potentially altered the aquatic environment, there is the chance that adding a hydro …
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Paleoenvironment reconstruction in extreme climates using organic geochemical investigations
… on centennial time scales along with varying biotic communities, water chemistry and lake level.
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