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 30 for “"aquatic plant"”.
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Aquatic Plant Communities and Invertebrates in a Prairie Pothole During Duck Brood Rearing
More than 1,100 samples of aquatic plants and associated invertebrates were collected in a prairie wetland. Sampling was done weekly throughout the duck brood rearing season. Linear regression revealed a 4 to 100 ratio of animal to plant biomass (R²=0.488). Comparatively high degrees of association …
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Flow and solute transport in random cylinder arrays : a model for emergent aquatic plant canopies
… constituting about 6% of earth's land surface, aquatic vegetation plays a significant role in defining mean flow patterns and in the transport of dissolved and particulate material in the environment. However, the dependence of the hydrodynamic and transport processes on fundamental properties …
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Waste remediation and value creation: the recovery of nutrients from dairy industry wastewater using the aquatic plant Lemna minor
… which was assessed in this thesis using aquatic Lemnaceae, i.e. duckweed. Accordingly, environmentally polluting compounds, such as N and P, are removed from the wastewater by plant action and in duckweed a valuable biomass is created which can be used as a feed or biofuel. In general, it …
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Impacts of the non-native aquatic plant water chestnut, Trapa natans, on inland freshwater nitrogen and oxygen dynamics, and host-specificity testing of the biological control insect, Galerucella birmanica
Water chestnut, Trapa natans, is a non-native aquatic plant with floating rosettes of leaves that has established and continues to spread in northeastern North America. Growing in calm freshwater environments, T. natans can grow densely on water surfaces, transforming open waters into thick …
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Propagation of Vallisneria Americana (MICHX): Vegetation Management In South Carolina Piedmont Reservoirs
<p>Aquatic plant communities in reservoirs can support biological and chemical processes that are typical of those found in more natural settings which may benefit reservoir managers and users through the associated enhancements that aquatic plants can bring to reservoir purposes. Reservoirs are …
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The Effects of Hydrilla Infestation on Selected Wintering Waterfowl: Santee Copper Lake System, South Carolina
<p>Hydrilla is an exotic aquatic weed that was introduced into Florida in the 1950's. Since that time it has spread rapidly from lake to lake throughout the southeast and beyond. The Santee Cooper lake system in eastern South Carolina was infested with the weed in the early 1980's. Since that time …
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Nutrient fluxes within the Berg River from 1976 to 2017, Western Cape, South Africa
… the recommended international guidelines for aquatic plant life. The long-term mean values of nitrate and nitrite also exceed the recommended guideline for aquatic plant life. Ortho-phospate mean values for the study showed that all sites experienced hypertrophic states at some stage during …
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Effects of Common Carp and Black Bullheads on Sago Pondweed
… may have a detrimental effect on submerged aquatic plant production and thus waterfowl habitat. The relative impact of small common carp (0.9 kg), large common carp (1.5 kg), and black bullheads ( 0.7 kg) on sago pondweed (Potamogeton pectinatus) production was tested within enclosures …
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Selection and Use of Aquatic Vegetation by Migratory Waterfowl in North Central Texas
Assessment of aquatic plant selection by waterfowl has been conducted during the winters of 1997-2000 on 49 0.2-0.79 ha research ponds in north central Texas. Ponds were categorized by dominant plant species into eight habitat types. Census with waterfowl species identification were performed to …
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Water Quality of East Texas Streams: Forested Versus Pastured Watersheds Receiving Poultry Litter Applications
… A rapid bioassessment was conducted to assess aquatic life stream conditions. Half of the 273 stream samples had nitrate-nitrogen concentrations greater than 0.30 mg L-1 high enough to support excessive aquatic plant growth, but were below the USEPA drinking water standard (10.0 mg L-1). …
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Trophic Interactions And The Efficacy Of Milfoil Weevils For Biocontrol Of Eurasian Watermilfoil In Wisconsin Lakes
… is the most heavily managed nuisance submersed aquatic plant in the United States. EWM’s rapid spring growth and formation of dense surface mats inhibits native macrophyte communities, serves as poor-quality habitat for fish and macroinvertebrates, impacts recreation, and can clog water supply …
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Consideration of biotype to improve invasive species management
… to generate global forecasts for invasive aquatic plant hydrilla (Hydrilla verticillata). To observe if hydrilla biotype influence SDMs, forecasts were produced and compared using data partitioned by biotype and all known hydrilla data. Further, differences in desiccation response between …
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Consideration of biotype to improve invasive species management
… to generate global forecasts for invasive aquatic plant hydrilla (Hydrilla verticillata). To observe if hydrilla biotype influence SDMs, forecasts were produced and compared using data partitioned by biotype and all known hydrilla data. Further, differences in desiccation response between …
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Microplastics chemical characterization, regional distribution, and effects on biota
… the impact of virgin and aged microfibers on plant growth. Through the analysis of biomass, chlorophyll content (Soil Plant Analysis Development values), water retention capability, and biochemical impacts, it was determined that the presence of microfibers has the potential to result in acute …
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Salinity Tolerance of Flowering Rush, Butomus umbellatus
<p>Flowering rush is an invasive aquatic plant in North America that causes deleterious effects to native ecosystems. There are two cytotypes, a triploid and diploid, and multiple genotypes contained within the diploid cytotype currently established in the U.S. Despite its presence in river …
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Foraging Ecology and Demography of Sternotherus Odoratus in a Southwestern Missouri Population
… turtle that inhabits a variety of soft-bottom aquatic ecosystems from stream and rivers to lakes, ponds, and ditches. Previous studies have examined its diet, but few have addressed other aspects of its feeding ecology. The objectives of this study were three-fold: 1) to collect demographic …
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The Relationship Between Salvinia molesta Infestation and the Microbial Ecology of Wetlands at Caddo Lake, TX, USA
… to assess microbial community response to aquatic plant invasion; however, there haven’t been any studies researching the influence of <em>Salvinia molesta </em>(D.S. Mitch.), commonly known as Giant Salvinia, on microbial communities. The goal of this study was to determine the influence …
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Analysis of Grass Carp Dynamics to Optimize Hydrilla Control in an Appalachian Reservoir
… management efforts, and 3) to describe the aquatic plant community in the New River upstream of Claytor Lake to assess the potential for alterations due to potential grass carp herbivory. Only 3% of radio-tagged grass migrated out of Claytor Lake during the 2-year study. Grass carp movement …
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Living and Recent Dead Milluscan Assemblages Upper Lasalle Lake, Minnesota
… contours and normal to the shoreline. Three aquatic plant associations were found in the lake – dense, finely-branching forms in shallow water; less dense and a greater percentage of broad-leaved plants in intermediate depths; and a sparse density of a finely-branching forms in deep water. …
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