The Eutrophic Status of Ten Central Iowa Lakes

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Show simple item record Miller, John George 2008-12-04T19:26:24Z 2008-12-04T19:26:24Z 1977-01
dc.identifier.other 1977 .M615
dc.description 35 leaves. Advisor: Dr. Phyllis Kingsbury en
dc.description.abstract The problem. To date little work has been done determining the eutrophic status of small central Iowa lakes. The purpose of this study is to (1) determine the eutrophic status of ten central Iowa lakes; (2) compare and contrast any differences between the lakes located within the Wisconsin Glacial drift and those lakes located outside of this area; and (3) compare and contrast any differences between natural and man-make lakes. Procedure. During the spring of 1975, the fall of 1975 and the spring of 1976, composite water samples were taken from the euphotic layer of each lake. Each water sample was then subjected to various tests including: alkalinity, free carbon dioxide, specific conductance, pH, nitrate and nitrite nitrogen and ortho and meta phosphate. After autoclaving, each water sample was innoculated with a test algae, Selenastrum capricornutum, and incubated under set conditions. Cell counts and algal dry weights were determined. The algal dry weights and seasonal changes in lake alkalinity were correlated to the eutrophic status of each lake. Findings. After incubation, all the samples from the man-made lakes had moderate algal dry weight values while the algal dry weight values of the samples from the natural lakes were higher. In general, the lakes located within the Wisconsin Glacial drift had higher chemical parameters than those located outside of this area but this did not seem to have any effect on the general eutrophic status of any lake studied. Conclusion. Of the lakes studied the man-made lakes are mesotrophic while the natural lakes are eutrophic. Recommendations. It is suggested that further studies on these lakes be more quantitative, employing more frequent samplings and including nutrient budgets and turnover to aid in developing a plan to improve water quality. en
dc.format.extent 1464290 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.publisher Drake University en
dc.relation.ispartofseries Drake University, School of Graduate Studies;1977
dc.subject Lakes--Iowa--Ecological aspects--Analysis en
dc.subject Water quality--Ecological aspects--Analysis en
dc.subject Selenastrum capricornutum en
dc.title The Eutrophic Status of Ten Central Iowa Lakes en
dc.type Thesis en

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