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 53 for “"Emergent Vegetation"”.
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Aquatic gravity currents through emergent vegetation
… examined the hydrodynamic effects of aquatic vegetation on these currents. This study investigates the dynamics of lock-exchange flows, a particular class of density currents, propagating through rigid emergent vegetation. First, previous mathematical formulation is extended to develop …
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Effects of Introduced Muskrat Populations on Emergent Vegetation in South Dakota Wetland
… level are the main forces controlling wetland vegetation cover and composition on a long term basis. IN the absence of artificial water control structures, properly managed muskrat populations are the most natural, long term means of regulating wetland vegetation. Reduction of prairie wetlands …
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High-resolution numerical investigation of hydrodynamics and sediment transport within emergent vegetation canopy
… Eddy Simulations of flow through staggered rigid emergent vegetation patch were performed using a spectral-element based solver, Nek5000. The staggered pattern of vegetation was similar to experiments conducted on the Odell-Kovasznay racetrack flume where a 5 cm gap was created within the …
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Density, Movements, and Habitat Use of White-Tailed Deer at Sand Lake National Wildlife Refuge, South Dakota
… and activity of hunters by moving farther into emergent vegetation (i.e., escape cover) on SLNWR. However, females that moved to private lands in response to high water in 1993 increased movements during harvest to elude hunters. In fall 1992, hunted females exhibited high diurnal activity in …
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Comparing Newly Built Wetlands in the Atchafalaya Bay, Louisiana and Sacramento-San Joaquin Delta, California
… from water level, river discharge, storms and vegetation. Mineral matter consistently added more to the marsh soil through volumetric and gravimetric contributions. Organic contributions were not significantly different across sites, suggesting the type of emergent vegetation at a site may not …
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Understanding the role of aquatic plants in stormwater management pond performance in Oshawa, Ontario, Canada
… by aquatic plants. Although submergent and emergent vegetation is common in SMPs, not much is known about their potential impacts on SMP performance. The aim of my thesis project was to investigate the effect of aquatic plants on the water treatment capacity of 15 SMPs in Oshawa, Ontario, …
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Movements, Survival, and Habitat Use of Mallard Broods Hatched from Predator Reduced Nesting Habitats in Eastern South Dakota
… 0.4-208.9 ha in size with 3.1- 100% coverage of emergent vegetation. Duckling survival was higher (0.33) for broods using wetlands with interspersions or a wide peripheral fringe of emergent vegetation versus those using wetlands with a narrow fringe or low percent coverage of emergent vegetation …
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Fish and Amphibian Occurrence in Waterfowl Production Area Wetlands in Minnesota During 1992
… wetlands, pH, total dissolved solids, several vegetational parameters, trap locations, existence and number of tributaries, trap type used, wetland class, cover type, and area of the sampled wetland. Tributaries and the number of Class V wetlands within a 1.6-km radius of the sampled wet land …
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Factors Affecting Waterfowl Brood Use of Stock Ponds in South Dakota
… in influencing brood use of stock ponds. Vegetation type, distribution of emergent vegetation and pond size were important in determining if broods of any particular species utilized a pond or not. Shoreline distance was particularly important in explaining variation in brood densities. …
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Mat Movement in Coastal Louisiana Marshes: Effect of Salinity and Inundation on Vegetation and Nutrient Levels
… two marsh types on the ocurrence of the dominant emergent vegetation was discussed.</p> <p>The main difference in physical structure of the two marsh types was the presence of a mineral, non-buoyant layer at 25-45 cm depth in the rooted marsh, which could serve as an anchor for the overlying …
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Mechanics of exchange flow between open water and an aquatic canopy
The presence of aquatic vegetation is a common feature in shallow water systems. It alters the dynamics of the system by producing additional drag and by generating differential heating between regions of vegetation and open water through the shading it provides. The differential heating creates …
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Managing Cattail (Typha latifolia) Growth in Wetland Systems
… had low seed germination. Established stands of emergent vegetation can prevent cattail colonization and spread. Germination of T. latifolia at various water depths was tested, and depth impacts on cattail seedling growth and survival were ascertained using various moist soil management …
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Landscape Characteristics Affecting Habitat Use and Productivity of Avifauna on Stock Ponds in Western South Dakota
… Wetlands in fragmented landscapes had more emergent vegetation, vegetation types, and trees due to less trampling and grazing pressure by livestock. Fragmented landscapes also had less steeply rolling terrain, providing for gradually sloping shores where emergent vegetation could become …
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Biodiversity patterns of wetland macroinvertebrate assemblages in the South-Western Cape, South Africa
… and the Agulhas Plain. Open-water, submerged vegetation and emergent vegetation habitats were sampled separately using a square-framed sweep net with a 23.5cm mouth and 80l1m mesh and physico-chemical attributes measured at each site. A total of 126 taxa emanating from more than 26 000 …
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Habitat Area Requirements of Prairie Wetland Birds in Eastern South Dakota
<p>The influence of area and vegetation structure on bird use of 830 semipermanent and seasonal wetlands (0.2-217.5 ha) was studied to evaluate vegetative needs and habitat area requirements of 20 breeding wetland bird species in eastern South Dakota in 1995-1996. Vegetative preferences of species …
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Population Characteristics of White-Tailed Deer During the Agricultural Production Season in Northeastern South Dakota
… treatments at the landscape level. Treebelts and emergent vegetation were highly selected (P< 0. 05) at the home range level between years. However, only treebelts were highly selected (P < 0.05) across treatments. Shrub-dominated grasslands and Conservation Reserve Program grasslands were highly …
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Relation of Habitat to Fish Community Characteristics in Small South Dakota Impoundments
… was positively correlated with aquatic vegetation coverage and Secchi disk transparency. The objectives of my research were tri-fold: 1) to quantify the available aquatic habitat in 24 small South Dakota impoundments, 2) to investigate the use of geographic information system technology …
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Ecology of Two Rare Amphibians of the Gulf Coastal Plain
… okaloosae used habitats with high amounts of emergent vegetation at both the among-stream scale and the within-stream scale. Emergent vegetation appears frequently in models of anuran habitat selection, particularly those that occur in fire-dominated landscapes. Further understanding the …
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Habitat Choice and Spatial Ecology of Nerodia Sipedon, the Northern Water Snake
… preferring open off-shore areas with dense emergent vegetation, and males utilizing more shaded shoreline areas. These differences were likely driven by specific thermal requirements of gravid females.
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The Relationship of Wetland Characteristics to Avian Cholera (Pasteurella Multocida) Outbreaks in the Rainwater Basin Area of Nebraska
… and the presence and percent coverage of emergent vegetation in the study wetlands. Dead stands of cattails (Typha glauca) were the predominant winter emergent vegetation; however, the summer vegetative mapping demonstrated that there was a considerable amount of diversity between study …
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