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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 23 for “"aquatic macroinvertebrates"”.
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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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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 …
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Community responses of aquatic macroinvertebrates to heavy metals in laboratory and outdoor experimental streams
This research describes aquatic macroinvertebrate community responses to heavy metals (copper, zinc) in experimental streams and at metal-impacted sites in the field. Experiments employed substrate-filled trays which were colonized in the field and then transferred to laboratory or outdoor streams. …
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Assemblage characteristics and sampling considerations for aquatic macroinvertebrates inhabiting a lower Mississippi River stone dike
… of implanted substrates in sampling aquatic macroinvertebrate assemblages associated with stone dikes on the Lower Mississippi River and to obtain basic information on assemblage composition, structure, and patterns of distribution over a dike. For study purposes, stone-filled baskets …
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Factors Affecting Distribution and Abundance of Aquatic Macroinvertebrates in Autumnal Wetlands in Mammoth Cave National Park, Kentucky, USA
… failed to find strong relationships between the macroinvertebrates and EV's. Additionally, the theory that hydroperiod would effect richness did not apply to these ponds. Within-pond canonical correspondence analyses, however, yielded strong relationships. Further testing using regression …
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Relationships Among Aquatic Macroinvertebrates, Endangered Waterbirds, and Macrophytes in Taro Lo'I At Hanalei National Wildlife Refuge, Kauai, Hawaii
… habitat conditions across the taro growth cycle, aquatic macroinvertebrate community characteristics, and the feeding ecology of koloa and moorhen during pre-breeding, nesting, brood-rearing, and molting when these waterbirds require increased protein, lipids, and minerals. Taro is grown at HNWR …
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Spontaneous succession of riparian vegetation and aquatic macroinvertebrates along the Silvermine River, South Africa, after fire and clearing of exotic plant species
… of the physical habitats (biotopes) available to aquatic organisms, changes in the community composition of riparian vegetation, and changes to aquatic macroinvertebrate assemblages present in the river. Data were collected during two successive summer-sampling periods (200 I and 2002) at three …
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Human impacts on ecosystems in the Chibefwe river catchment area in Mkushi district, Zambia
… use activities on river health conditions using aquatic macroinvertebrates as indicators of water quality in the Chibefwe River Catchment area in Mkushi district, Central Province, Zambia. Three study sites were selected on the Chibefwe River: One near the source of the Chibefwe River (this …
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Human impacts on ecosystems in the Chibefwe river catchment area in Mkushi district, Zambia
… use activities on river health conditions using aquatic macroinvertebrates as indicators of water quality in the Chibefwe River Catchment area in Mkushi district, Central Province, Zambia. Three study sites were selected on the Chibefwe River: One near the source of the Chibefwe River (this …
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Determining a Total Dissolved Solids Release Index from Overburden in Appalachian Coal Fields
… have been linked to a decrease in survival of aquatic macroinvertebrates. Our objective was to determine the effect of different solutions on overburden dissolution, and to develop a TDS release index. Forty-one overburden samples were collected from surface mines in West Virginia, Virginia, …
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Effects of Light and Macroinvertebrate Consumers on Detrital Microbial Biofilms in Streams
<p>In lotic freshwater systems, aquatic macroinvertebrates are key processors of biofilms that grow upon organic matter. Although macroinvertebrate effects on biofilms may depend on light availability, the combined effects of consumers and light remain unexplored. Here, I conducted experiments to …
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Floral and Faunal Colonization of Restored Wetlands in West-Central Minnesota and Northeastern South Dakota
… in species abundance and richness of waterfowl, aquatic macroinvertebrates, fish and hydrophytes in restored wetlands of differing ages since restoration. One hundred fifty-six seasonal and semi-permanent restored basins of 12 age strata were surveyed in 3 counties of northeast South Dakota and 6 …
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Temporal Patterns of Aquatic Macroinvertebrate Communities and Organic Matter Standing Stock Availability in a Coastal Floodplain (Altamaha River, Georgia)
… of the US. This study aims to investigate how aquatic macroinvertebrate communities changed over the course of the annual flood pulse. I predicted that the communities would be different and that the differences would be driven by hydrology at the main stem and organic matter standing stock …
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The influences of hydrology and vegetation on emergent insect and benthic macroinvertebrate communities across space and time in seasonally inundated, geographically isolated wetlands
… However, they support a diverse community of aquatic macroinvertebrates, including insects that serve as energy in upland food webs when they emerge as adults. How aquatic macroinvertebrate communities, particularly emergent aquatic insects, respond to vegetation and differences in long-term …
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Post-implementation re-assessment of agricultural best management practices on watersheds of Conesus Lake: Effects on stream water chemistry and aquatic macroinvertebrate communities
… monitoring periods. In addition, we performed an aquatic invertebrate diversity and biotic index study to determine if BMP streams have healthier populations of aquatic macroinvertebrates than non-BMP streams. We observed higher nutrient concentrations and loss of nutrients in the agricultural …
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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, …
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The influence of an ecosystem engineer on nutrient subsidies and fish invasions in southwestern Montana
… <p>I showed that beaver impoundments enhanced aquatic resource availability to terrestrial consumers. Beaver impounded watersheds had increased densities of emerging aquatic macroinvertebrates and higher levels of aquatic carbon in terrestrial consumer tissues, resulting in higher terrestrial …
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The influence of an ecosystem engineer on nutrient subsidies and fish invasions in southwestern Montana
… <p>I showed that beaver impoundments enhanced aquatic resource availability to terrestrial consumers. Beaver impounded watersheds had increased densities of emerging aquatic macroinvertebrates and higher levels of aquatic carbon in terrestrial consumer tissues, resulting in higher terrestrial …
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Responses of Aquatic Benthic Macroinvertebrate Communities to a Large Flow Pulse in the Guadalupe, San Antonio and Brazos River Basins, Texas
Riverine benthic macroinvertebrates (BMI) communities are regulated, in part, by the dynamic character of the river’s flow regime. Purpose of this study was to assess the influence of a flow regime component (i.e., large flow pulse) on BMI riffle communities, specifically that large flow pulses …
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Bioenergetics of Rainbow Trout in Lake Oahe, South Dakota
… June and September. Overall, RI values for aquatic macroinvertebrates and rainbow smelt were lower than the other two prey categories. Zooplankton were the most important prey for rainbow trout < 330 mm and decreased in importance as rainbow trout increased in length. Rainbow trout between …
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