

@mastersthesis {6690,
	title = {Landscape influences on lake chemistry and {Ostracod} community structure in small southern {Wisconsin} dimictic lakes},
	year = {2005},
	note = {3200116},
	school = {The University of Wisconsin - Madison},
	type = {phdPh.{D}.},
	address = {Ann Arbor},
	abstract = {The natural land cover patterns that characterize the southern part of Wisconsin are legacies of a glaciated past. Land cover pattern and geomorphology control the hydrologic connections between water resources and the land by which ecosystems, including lakes are organized. Landscapes are the combined result of natural forces and human action. Anthropogenic disturbance, dominated by agricultural production, changes land patterns and modifies natural landscape functions (e.g. the flow of nutrients), and induces chemical changes in lakes that directly and indirectly affect aquatic community structure and function. I studied 12 small dimictic lakes over a three year period, assessed land cover patterns at multiple spatial scales and used correlation analysis and nonmetric multidimensional scaling (NMS) ordination techniques to (1) evaluate concentrations of atrazine in study lakes, (2) explore the relationships between water chemistry and landscape attributes at riparian, catchment and watershed scales, and (3) explore the relationship between lake chemistry and ostracod community structure. Dramatic links between land attributes (composition and pattern metrics) and water chemistry were found. Atrazine was found in ecologically relevant concentrations in water (0.70 μg/L) and sediment (130 μg/L), which warrants further investigation. Landscape attributes associated with reduced water quality were correlated with agriculture, whereas improved water quality was correlated with forests and wetlands. Ostracod richness and abundance was unimodally related to lake depth and productivity. Pelagic and littoral productivity may be related to regional agricultural land use. Ostracod community composition provided information about macrophyte richness, and local and regional land use. Biodiversity was monotonically related to total dissolved solids. Thus, in southeastern Wisconsin, lakes and their biota were found to integrate the effects of geomorphology and land use on water chemistry and hydrobiology.},
	keywords = {0425:Biogeochemistry, 0768:Environmental science, 0793:Freshwater ecology, 0996:Geochemistry, Biogeochemistry, Biological sciences, Community structure, Dimictic, Earth sciences, Environmental science, Freshwater ecology, Geochemistry, Health and environmental sciences, Lakes, Landscape, Ostracod, Wisconsin},
	url = {http://search.proquest.com/docview/305379029?accountid=14270},
	author = {Allen, Paula E}
}
