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 242 for “"Macroinvertebrates"”.
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Ecology of benthic macroinvertebrates in experimental ponds
I studied life history parameters of 5 taxa of aquatic insects in the orders Ephemeroptera and Odonata, successional patterns over 2 years of pond development, and precision of 15 biological metrics in a series of 6 replicate experimental ponds from March 1989 to April 1990. I determined voltinism, …
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Road Salt Runoff - Impact on Macroinvertebrates and Water Quality
Macroinvertebrates are critical food resources for higher trophic level predators in freshwater food webs. Salt contamination due to road de-icing can often produce a dense saline layer just above the sediment–water interface potentially exposing benthic macroinvertebrates to high salt …
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Biomonitoring an Impacted Stream Using Benthic Macroinvertebrates and Bioassays
This study used a combination of benthic macroinvertebrate biomonitoring and single-species bioassays to monitor water quality in Wilson's Creek, Springfield, MO, for the 2-year period January 1993-December 1994. Wilson's Creek was potentially impacted by increased urbanization, agricultural …
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The Distribution of Macroinvertebrates Along the Impounded Middle Chattahoochee River
… a broad range of responses within the ecosystem. Macroinvertebrates are particularly sensitive to disruptions in flow, since most are able to survive only within a distinct range of hydraulic parameters, including discharge, velocity, and surface elevation. While disturbances in the …
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Species Diversity of Benthic Macroinvertebrates in the Des Moines River, Iowa
… at four stations were used to collect benthic macroinvertebrates. Community structure was analyzed with species divorsity indices. Species diversity (D) and redundancy (R) values were used to calculate standardlzed distance (SD) values. The indices were analyzed statistically. Findings. The …
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Effects of sediment upon benthic macroinvertebrates in forested northern Appalachian streams
… the influence of fine sediment upon benthic macroinvertebrates. The first part encompassed two experiments in sediment manipulation in 1999 and 2000. The experiments tested benthic macroinvertebrate metric sensitivity to a range of fine sediment treatments. The second part involved four …
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Ecologically relevant low flows for riverine benthic macroinvertebrates: characterization and application
Intensifying hydrologic alteration and the resultant degradation of river ecosystems worldwide have catalyzed a growing body of ecohydrological research into the relationships between flow regime attributes, physical habitat dynamics and biotic response, particularly for determining environmental …
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The Impact of Urbanization on Benthic Macroinvertebrates in Southern Appalachian Streams
Macroinvertebrate assemblage structure was compared from 12 streams differing in urbanization type and degree. Urbanization, both historical and current, was measured using several variables generated from GIS overlays of land cover, aerial photographs, and field exploration in the study …
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Effects of Phorate on Ducklings, Macroinvertebrates, and Microtox in Northern Prairie Wetlands
… on mallard (platyrbynchos) ducklings and aquatic macroinvertebrates was studied in littoral mesocosms in South Dakota wetlands. In 1991 and 1992, four mesocosms were constructed in each of three wetlands. In each wetland, one mesocosm was a reference and phorate concentrations of 1.2, 2.4, and 4.8 …
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Contemporary Assessment of Benthic Macroinvertebrates and Fish Interaction in the Truckee River, NV
… quality and investigated the response of benthic macroinvertebrates to these changes. In addition, the interactions among native and non-native fishes were investigated. In chapter 1, the longitudinal trends of water quality and benthic macroinvertebrates were examined. A linear mixed model was …
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EFFECTS OF TIME, SEED SOURCE, AND PLANT COMPOSITION ON MACROINVERTEBRATES IN RESTORED PRAIRIE
… non-dominant plant species influence aboveground macroinvertebrates community structure in restored prairie. A chronosequence design (space for time substitution) was used to determine the role of restoration age, plant community, and soil structure on the recovery of two belowground …
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Impacts of trace metal pollution, urbanization and aquifer recharge on Spokane River macroinvertebrates
… than urbanization effects on Spokane River macroinvertebrates. Patterns of trace metal concentrations in macroinvertebrates tissues in this study are consistent with patterns from 1979-1981 and 1999. Concentrations in the tissues of Hydropsyche cockerelli declined with distance downstream of …
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Ecological Studies on Benthic Macroinvertebrates in Lowland Rivers in Relation to Water Quality
The effectiveness of using macro-invertebrate communities as indicators of water quality and pollution in deep lowland rivers was investigated, and the effects of natural environmental changes on their ability to monitor pollution was assessed. Various sampling and data processing techniques were …
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Biological assessment of tropical riverine systems using aquatic macroinvertebrates in Tanzania, East Africa
In Tanzania, and in East Africa in general, bioassessment methods for monitoring and assessing riverine ecosystems are not yet in place. This thesis describes the development of a macroinvertebrate-based bioassessment method for assessing the degree of anthropogenic disturbance in Tanzanian rivers. …
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Ecological aspects of the macroinvertebrates associated with two submersed macrophytes in Lake Kariba
Lagarosiphon ilicifolius Obermeyer and Vallisneria aethiopica Fenzl are the most common and abundant submerged macrophytes in shallow inshore waters of Sanyati Basin, Lake Kariba. Lagarosiphon is structurally more complex than Vallisneria. This study considered the macroinvertebrate assemblages …
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Macroinvertebrates associated with macrophytes in Sodwana Bay : with further consideration of amphipod taxonomy
… biotopes were selected to focus sampling. Macroinvertebrates, macrophytes and sediment were collected from forty-five 25 x 25 cm quadrats.
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Ecotoxicological and genetic effects of a mixture of heavy metals on selected aquatic macroinvertebrates
… to a mixture of heavy metals on selected aquatic macroinvertebrates. Studies centered on macroinvertebrates collected from, or concentrations found in. the upper Arkansas River. The upper Arkansas River receives wastes from mines and tailings piles in Leadville. Colorado and has been recognized as …
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