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Full-Text Articles in Physical Sciences and Mathematics
Land Use Interactions Drive Southwestern Ontario Stream Nutrient Concentrations, Renee L. Lazor
Land Use Interactions Drive Southwestern Ontario Stream Nutrient Concentrations, Renee L. Lazor
Electronic Thesis and Dissertation Repository
Human activities have transformed the landscape and altered natural habitats through intensive land uses including agriculture and urbanization. Identifying land use drivers of tributary nutrient concentrations and describing the magnitude and direction of their relationship are critical activities to improvement management of water quality in basins draining into the Great Lakes. The overarching goal of my thesis was to quantify the cumulative influence of spatial patterns in land use and land cover on variation of nutrient concentrations in tributaries of the Great Lakes. Biweekly water chemistry samples were collected in 29 streams located in southern Ontario between May and November, …
Analysis Of Water Quality For Lake Tarpon, Pinellas County, Florida, Kristi Nichole Savio
Analysis Of Water Quality For Lake Tarpon, Pinellas County, Florida, Kristi Nichole Savio
USF Tampa Graduate Theses and Dissertations
Urbanization has taken a major toll on the water quality of Lake Tarpon. In response, there have been management strategies and legislation put in place to help improve water quality. Our objective was to identify what management strategies and other environmental factors were driving changes in Lake Tarpons water quality from 1970 - 2010. Trends in water quality were analyzed against precipitation, land use and water quality management strategies to achieve this. Results found that two water quality management strategies, the creation of the Lake Tarpon Outfall Canal and the closing of the Lake Tarpon Sink, improved water quality the …
Dispersal Capabilities Of Two Plecopteran Species And Macroinvertebrate Community From Four Watersheds In Northeast Ohio, Alison L. Yasick
Dispersal Capabilities Of Two Plecopteran Species And Macroinvertebrate Community From Four Watersheds In Northeast Ohio, Alison L. Yasick
ETD Archive
This dissertation focused on the insect order Plecoptera, and hypothesized that Allocapnia recta populations would have lower genetic diversity than Leuctra tenuis between adjacent Chagrin and Grand Rivers due to wing structure and season of terrestrial adult emergence. Genetic variations within the 16s rRNA region of mtDNA in A. recta, a winter emerging adult with rudimentary wing structure, and L. tenuis, a summer emerging adult with fully developed wings, were compared and revealed significant genetic variability between A. recta samples from the two rivers (FST = 0.20) but not between L. tenuis samples (FST = 0.07). Further genetic variation investigation …
Advances In Understanding The Molecular Composition Of Dissolved Organic Matter And Its Reactivity In The Environment, Rajaa Mesfioui
Advances In Understanding The Molecular Composition Of Dissolved Organic Matter And Its Reactivity In The Environment, Rajaa Mesfioui
Chemistry & Biochemistry Theses & Dissertations
Dissolved organic matter (DOM) is the ultimate product of Earth's systems dynamics. DOM chemical signature is strongly shaped by the interaction among Earth's spheres, such as the atmosphere, the geosphere, the biosphere, and the hydrosphere, but also life and human activity. DOM source, composition, photochemical alteration and availability affect freshwater ecosystems, their carbon and nitrogen fluxes and, thus, the global carbon and nitrogen cycles. The aim of this thesis was to gain an understanding of the molecular composition of DOM and its photochemical and biological reactivity in an environment impacted by anthropogenic disturbance. The York and James River systems within …