Global ETD Search

21	Significance of the Rates of Atmospheric Deposition Around Utah Lake and Phosphorus-Fractionation of Local Soils Reidhead, Joshua Glen 01 August 2019 (has links) Eutrophic Utah Lake receives a large nutrient load from a variety of sources, includingtreated wastewater discharges, runoff and tributaries, recycling from bottom sediments andAtmospheric Deposition (AD). AD was the focus of this study and was comprised of twocomplementary parts. First was a study of nitrogen and phosphorus depositions from theatmosphere, and second was a study of phosphorous as contained in soils near Utah Lake viafractionation methods.The soil samples were found to contain approximately 1,000 mg-P/kg soil for totalphosphorus (TP). A separate phosphorus (P) fractionation gave slightly higher values, excludingthe residual P, we are 95% confident that one gram of sample soil contains between 2.2 and 4.3percent water soluble P, 0.6 to 1.1 percent loosely-bound P, 2.5 to 4.4 percent aluminum andiron-bound P, and 90.7 to 94.2 percent calcium-bound P.AD results indicate that during the period from April 1 to Nov 17, 2018, Utah Lakereceived approximately 58 tons of soluble reactive P, 153 tons of TP, 118 tons of nitrogen (N)from nitrate, and 387 tons of N from ammonium via AD.Nutrient quantities from AD are very large compared to the 17 ton/yr of P needed for aeutrophic loading to the lake. Because of the very large overall nutrient loading to Utah Lake, itis likely that some other limiting growth factors are controlling algal growth. atmospheric deposition nutrients soluble reactive phosphorus total phosphorus nitrogen eutrophic loosely-bound P aluminum and iron-bound P and calcium-bound P Engineering
22	Složení a struktura společenstev larválních stádií motolic v modelových druzích sladkovodních plžů v eutrofních prostředích ve střední Evropě / Composition and structure of larval trematode communities in model freshwater pulmonate gastropods in eutrophic environments in Central Europe SOLDÁNOVÁ, Miroslava January 2011 (has links) This work applies advanced sampling (mark-release-recapture) and comparative approaches addressing the patterns in composition, structure and variability of larval trematode communities in three species of gastropod molluscs (Lymnaea stagnalis, Planorbarius corneus and Radix auricularia) at two nested scales of community organisation in typical Central European eutrophic environments. Hypothesis-testing with the application of null-model analyses, logistic regression modelling and multivariate randomisation techniques, revealed determinants of transmission rates, levels of infection and community structure in freshwater snail hosts in Central Europe and elucidated the mechanisms linking the spatial and temporal environmental variability with the action of complex community assembly rules in freshwater pulmonate snails.
23	Varved lake sediment used to assess anthropogenic and environmental change in Summit Lake, Akron, Ohio Rego, Melissa 26 June 2022 (has links) No description available. Biogeochemistry Environmental Geology Environmental Science Geochemistry Geology Hydrology Limnology Sedimentary Geology Varved Sediment Whitings Calcite Precipitation Urban Lake Hydrology Heavy Metal Pollution Recreational Opportunity Harmful Algal Blooms Summit Lake Dimitic Lake Thermal Stratification Anoxic Hypolimnion Eutrophic Lake
24	Phosphorus mass balance for hypertrophic Grand Lake St. Marys, Ohio Taylor, Astrea 28 September 2012 (has links) No description available. Agricultural Chemicals Agriculture Chemistry Environmental Geology Environmental Management Environmental Science Environmental Studies Geochemistry Water Resource Management

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