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 38 for “"aquatic invertebrate"”.
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Environmental Stressors: Pathways Of Exposure And Aquatic Invertebrate Response
… aqueous versus sedimentary exposure of PCBs on invertebrates. In the laboratory, organisms exposed to PCB-contaminated sediments experienced greater mortality than those exposed to PCB-contaminated water and in the field experiments those closer to the sediments experienced greater mortality …
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Avian and Aquatic Invertebrate Abundance on Three Agricultural Management Systems in Eastern South Dakota
… systems on wildlife by determining avian and aquatic invertebrate abundance on a conventional (CON), organic (ORG), and transitional no-till (TNT) farming system. Waterfowl pair abundance varied for individual species on all wetland classes in 1993 and 1994. Total waterfowl pair abundance was …
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The Influence of Agricultural Chemicals on Aquatic Invertebrate Biodiversity and Genetic Diversity in Northern Prairie Wetlands
… sorting techniques commonl y used in wetland invertebrate investigations were evaluated. In the summer of 1991, the impact of the insecticide phorate on wetland invertebrates, and the use of a community diversity index and electrophoresis as methods for revealing the impact of phorate were …
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Lake Erie coastal marsh aquatic invertebrate community structure across habitats dominated by two different emergent macrophytes
… was to determine if there was a difference in aquatic invertebrate communities between areas dominated by<em> Phragmites australis</em> and areas dominated by <em>Typha spp</em>. in a freshwater coastal marsh. The hypothesis was that aquatic invertebrate diversity and abundance would be greater …
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Is aquatic invertebrate endemism in the Western Cape region of South Africa related to the fynbos blackwaters?
… very endemic, specialized terrestrial flora and aquatic fauna. It has been argued that the high degree of endemism is related to the origin of the fauna, the multiplicity of habitats present and the harsh water chemistry characterized by low pH. The aim of this project was to look at the …
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Assessment of Aquatic Invertebrate Communities of Tributaries of the Buffalo River, Arkansas, and Evaluation of Indices of Community Integrity
… by the National Park Service to assess the aquatic invertebrate community of the Buffalo River, Arkansas. The BRICI has been successfully used on the main-stem of the river, but not evaluated on tributaries in the watershed. The purpose of this study was to evaluate the BRICI, comprised of …
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Body Size And Habitat Shading Influence The Consumptive And Non-Consumptive Effects Of Wood Frog (lithobates Sylvaticus) Tadpoles On Aquatic Invertebrate Communities
… of predation have been well-studied in most aquatic systems, but non-consumptive (indirect) effects on prey have only recently received limited attention in some groups. As aquatic consumers, tadpoles have traditionally been considered strict herbivores, leaving their predatory impacts via …
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Chemical Treatment of Monodominant Cattail Stands In Semipermanent Wetlands: Duck, Invertebrate, and Vegetation Response
… of breeding and overwater nesting ducks and aquatic invertebrates to the chemical treatments were studied in northeastern South Dakota. Four wetlands were treated with glyphosate in 1985 by fixed-wing aircraft and were compared to cattail-dominated wetlands and wetlands with a natural …
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Availabilty of Potential Invertebrate Foods for Anatini Ducklings Above and Below the Water Surface of Eastern South Dakota Wetlands
The availability of aquatic and aerial invertebrates as potential foods for Anatini (dabbler) ducklings was explored during the summers of 1998 and 1999 in eastern South Dakota. Two study areas, the Oakwood Lakes complex and Mickelson Memorial Wetland, were chosen for this research during the …
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Spatial and temporal analysis of pharmaceutical concentrations and chitobiase activity in the Upper Tennessee River
… Chitobiase is an enzyme expressed by developing aquatic invertebrates and may be used as a bioindicator of aquatic invertebrate population health. These two measurements were compared to determine if either total or single pharmaceuticals correlate with chitobiase concentrations. The method for …
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Biological Diversity of Natural and Created Wetlands in Three Physiographic Regions of South Dakota
… Within each region, macrophyte, terrestrial and aquatic invertebrate, and bird communities were sampled in three natural and six created wetlands each year. Macrophyte and terrestrial invertebrate communities in created wetlands were comparable in diversity and richness with natural wetlands. …
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The Relationship of Wetland Characteristics to Avian Cholera (Pasteurella Multocida) Outbreaks in the Rainwater Basin Area of Nebraska
… during 1987 and 1988. Thirty-five different aquatic invertebrate taxa were identified from 214 benthic core samples, and 26 invertebrate taxa were identified from 214 benthic core samples. Although sampling difficulties and small sample sizes precluded a complete inventory of the aquatic …
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Abundance, Biomass, and Diversity of Aquatic Invertebrates in Level Ditches and Adjacent Natural Emergent Marsh in an Eastern South Dakota Wetland
The aquatic invertebrate communities of level ditches and adjacent natural emergent marsh in a South Dakota prairie wetland were sampled during the summer of 1982. Collections were made in both the water column and the bottom substrates. Forty-five taxa were collected. Analysis of variance …
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Genomic tools to investigate and characterise emerging and reemerging disease in aquatic invertebrates
Emerging and re-emerging diseases in aquatic invertebrates present significant challenges to global aquaculture, threatening food security, livelihoods, and ecosystem health. This thesis addresses critical knowledge gaps in the detection, characterisation, and management of aquatic invertebrate …
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Community Composition of Aquatic Invertebrates along Dissolved Oxygen Gradients in Lake Huron Coastal Wetland Wet Meadows
Wetlands are an ecotone between terrestrial and aquatic environments and therefore support a diverse and unique flora and fauna. Macroinvertebrates make up a substantial portion of the biodiversity. The relationship between aquatic invertebrate community composition and the association with …
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Effects of hematodinium infection on the Norway lobster, nephrops norvegicus (L.)
… model system for studying stress responses in aquatic invertebrate hosts. The study has described in much greater detail than before the effect of parasitism on host lobsters, and has related these effects to the moult cycle and to host condition. Furthermore, it has shown how changes in host …
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The Effects of Climate Change and Long-term Fire Suppression on Ephemeral Pond Communities in the Southeastern United States
… provide important habitat for amphibians and aquatic invertebrates, but extensive deforestation has destroyed or isolated many wetlands and fire suppression has altered vegetation in others. My goals were to identify how wetland hydroperiods have changed through time and to examine the effects …
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The effects of the invasive exotic Chinese tallow tree (Triadica sebifera) on amphibians and aquatic invertebrates
… litter from trees affects animals that live in aquatic environments, with an emphasis on the effect of Chinese tallow (Triadica sebifera) leaf litter on anuran larvae (i.e., frog tadpoles). This question is important to our understanding of how allochthonous inputs to aquatic habitats drive …
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