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 59 for “"Aquatic Invertebrates"”.
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The Effects of Ultraviolet-B Radiation on Aquatic Invertebrates
… is known about the effects of UV-B radiation on aquatic ecosystems. The purpose of this study was to assess the sensitivity of aquatic invertebrates to UV-B radiation. Solar simulators were used to expose five species of aquatic invertebrates to enhance levels of UV-B radiation. The simulators …
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Effects of Rodeo Herbicide on Aquatic Invertebrates and Fathead Minnows
… about it effects on nontarget organisms such as aquatic invertebrates that are important as a food source for waterfowl. The objectives of this study were to evaluate the effects of Rodeo on the survival of aquatic invertebrates in wetlands, and to determine in the laboratory the acute toxicity …
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Fathead Minnows, Aquatic Invertebrates, and Mallard Duckling Interactions in Man-Made Ponds
… of the trap on catch has not been tested. Aquatic invertebrates were collected in horizontally and vertically oriented activity traps in experimental ponds in 1990 to test trap orientation effectiveness. Horizontal traps caught the most invertebrates, vertical traps caught more …
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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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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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The role of farm dams as refugia for aquatic invertebrates in a salinised landscape, south Western Australia
… undertaken at this wetland. Farm dams act as aquatic refugia if they convey resistance and/or resilience to the biotic communities of a disturbed habitat. This study proposed to investigate farm dams as potential refuge habitats from which aquatic macroinvertebrate species could recolonise …
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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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Effects of temperature and salinity on the rate of oxygen consumption of Neomysis intermedia (Czerniavsky)
… important environmental l factor in the liver of aquatic invertebrates (Kaune, 1564). In general, aquatic invertebrates are thermo Comforters, and their ratio of metabolics and activity are decisively affected by water temperature. The capacity to regulate ray increase or decrease as a function of …
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Invertebrate Egg and Plant Seed Banks in Natural, Restored, and Drained Wetlands in the Prairie Pothole Region (USA) and Potential Effects of Sedimentation On Recolonization of Hydrophytes and Aquatic Invertebrates
… of sediment load on emergence of plants and invertebrates from seed and invertebrate egg banks. Additionally, I compared the seed and invertebrate egg bank composition of high quality reference wetlands (i.e., having no history of cultivation) to previously farmed nondrained, restored, and …
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Invertebrate Fauna of the Carapaces of the Texas River Cooter (Pseudemys texana) and the Red-Eared Slider (Trachemys scripta elegans)
… quantified. The relationship between turtles and aquatic invertebrates is less known. This study described quantitatively the invertebrate fauna inhabiting the algal covering of the carapaces of 2 species of freshwater turtles, the Texas river cooter (Pseudemys texana) and the Redeared slider …
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FACTORS AFFECTING MERCURY BIOMAGNIFICATION IN RIVERINE FOOD WEBS IN THE ROCKY MOUNTAINS: CLARK FORK RIVER BASIN, MONTANA, U.S.A.
… of studies suggest that Hg biomagnification in aquatic systems are dependent on two factors: a source of mercury and the potential for this mercury to become methylated. To compare the importance of these two factors in a riverine system I examine sites with varying sediment total mercury …
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FACTORS AFFECTING MERCURY BIOMAGNIFICATION IN RIVERINE FOOD WEBS IN THE ROCKY MOUNTAINS: CLARK FORK RIVER BASIN, MONTANA, U.S.A.
… of studies suggest that Hg biomagnification in aquatic systems are dependent on two factors: a source of mercury and the potential for this mercury to become methylated. To compare the importance of these two factors in a riverine system I examine sites with varying sediment total mercury …
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Influence of physical habitat management strategies on sportfish and food-web processes
… habitat material type and spatial arrangement on aquatic invertebrates and the growth, condition, and survival of largemouth bass (M. salmoides) and bluegill (L. machrochirus), independent of habitat amount. Patterns of invertebrate community colonization and daily secondary production were …
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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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Seasonal infection of invasive Brook Stickleback (Culea inconstans) by the nematode Contracaecum multipapillatum at Turnbull National Wildlife Refuge, Washington
… host body condition, and identify potential invertebrates facilitating transmission. Brook stickleback and aquatic invertebrates were collected bimonthly from April-November 2023 in Kepple, Blackhorse, and Middle Pine ponds. Fish body morphometrics were recorded, followed by necropsy to …
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Uptake of Mercury and Relationship to Food Habits of Selected Fish Species in the Shenandoah River Basin, Virginia
… the South Fork of the Shenandoah River. Algae, aquatic insects, crayfish, detritus, and fish accounted for 75-97% of the diet. Total mercury in aquatic invertebrates and forage fish in contaminated rivers ranged from 66.7-398.3 and 198.0-594.9 ng/g wet weight, while total mercury in aquatic …
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Smallmouth Bass Seasonal Dynamics in Northeastern South Dakota Glacial Lakes
… for stomach contents removal. In general, aquatic invertebrates were the dominant prey items both in percent composition by number and by weight for all smallmouth bass. For smallmouth bass shorter than 180 mm, diet composition was dominated by aquatic invertebrates in May and June then the …
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Isolation of novel antibiotic producing microorganisms from invertebrates
… research were to investigate terrestrial and aquatic invertebrates as a source of antibiotic producing microorganisms, to isolate the organisms and screen them for activity against Gram-positive and Gram-negative bacteria. Those with activity would be further characterised. Forty-seven …
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An Avian Botulism Epizootic Affecting a Nesting Site Population of Presbyornis : on a Carbonate Mudflat Shoreline of Eocene Fossil Lake
… event (lowest in the section) is a widespread aquatic gastropod mortality with localized eggshell and a few <em>Presbyornis</em> bones. This gastropod mortality event occurred on a surface of nondeposition. The second event (2 cm higher) is a broad strandline deposit of at least 66 …
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