Thesis

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Relationships of lake morphometry and sediment nutrient chemistry by short cores in south central Minnesota

Ayers, Michael B
This study involved the analysis of the relationships of morphometric parameters and sediment chemistry. The morphometric parameters included area, mean depth, maximum depth, volume, volume development index, shoreline and shoreline development index. The sediment chemistry analysis involved phosphorus, total nitrogen, percent inorganic, percent organic, percent calcium carbonate, and percent ash. The sediment chemistry was based on short cores from the deepest basin of each lake.

An assessment of the zooplankton annual succession in a hypereutrophic southern Minnesota lake utilizing two sampling methods

Sathrum, Carl B
Zooplankton samples were obtained utilizing two sampling methods to determine: 1) the annual succession of zooplankton taxa; and; 2) correlation between samples obtained by a simple composite sampler and a Birge/Juday trap sampler. Duck lake-small, hyper-eutrophic, with simple basin-had a early summer littoral zone dominated by Potamogetan crispus macrophytes. It was reasoned that the abrupt transition of large-bodied cladacera (primarily Daphinia) populations to small-bodied cladacera and copepod was due to centarchid (panfish) predation following the rapid senescence of Potamegeton crispus.

Selected Physical and chemical factors in a limestone strip-mine pond

McMichael, Dale E.
Physical and chemical factors were measured in the Marquette Quarry strip-mine pond to determine the degree of homogeneity or heterogeneity. Water temperature, air temperature, light intensity, light penetration, turbidity, ice thickness, snow depth, water level, precipitation, pH, carbon dioxide, dissolved oxygen, bicarbonate alkalinity, total alkalinity, calcium hardness, total hardness, residual hardness, dissolved solids and conductivity were measured at one meter intervals in one, two and three meter water columns every two weeks throughout 1973.

A comparison of heavy metal concentrations in storm water residual sediments withing urban storm water drainage systems located in south central Minnesota

Menden, Steven T.
This study is a comparison of heavy metal concentrations in urban stormwater residual sediments found within receiving bodies of water in Blue Earth, Waseca and Faribault Counties in South Central Minnesota. This study assessed the quantity of heavy metal loading occurring in stormwater residual sediments within receiving bodies of water. Residual sediments were collected from ten municipalities in South Central Minnesota.

A Quantitative geomorphological study of public drainage ditches in south central Minnesota

Silis, Ainars
The development of artificial drainage ditches has become extensive in South Central Minnesota in the last 120 years. This study examines the effects of artificial drainage on surface water hydrology using quantitative geomorphic analysis. Eighteen quantitative geomorphic parameters and seven descriptors for 269 artificial drainage ditches were determined.

The impact of wetlands and drainage on water quality in an agricultural watershed in south central Minnesota

Larson-Albers, Catherine E
To form a baseline study of a proposed county ditch, nutrient levels (PO4-P, TKN, and NO3-N), conductivity, and turbidity were monitored during 1980 at eight sites along the stream proposed to be channelized. Tributaries from three partly drained wetlands and four drainage ditches were also sampled to compare wetland and ditch outputs and to access their impact on the stream's water quality.

Water quality investigation of the county ditch 59-Cannon River Watershed, Le Sueur County, Minnesota

Larson, Timothy J
Nutrient input to a southern Minnesota hypereutrophic lake from the combined watershed of a second-order stream and an agricultural drainage ditch was monitored for a 14 month period, from July 1975 to September 1976. The stream-ditch watershed was divided into subwatersheds and the water quality of each was sampled approximately every seven to ten days during the ice free period and monthly during the ice cover period. Subwatershed flow rates were measured for each sample period and used to calculate subwatershed and total watershed nutrient loading.

Estimation of nutrient loading by groundwater into a lake using stable isotopes

Olson, Charles J
Fulda lake is a small eutrophic lake located in southwestern Minnesota. It has a single main inlet and outlet stream, and is contained in ground moraine (Hobbs and Goebel, 1982). This study compared the contributions made by surface and subsurface flow to the eutrophication of the lake system by determining their loadings of nutrients (Nitrogen and Phosphorus). To estimate groundwater's contribution to the lake's water budget, a mass balance was conducted using the stable isotopes of hydrogen and oxygen.

The seasonal distribution and abundance of Cladocera and Copepoda in a Minnesota Dolomite Quarry

Kubly, Dennis M
Ecological information on the annual cycle of distribution and abundance in the cladoceran and copepod species in a south central Minnesota dolomite quarry was collected during 1972-1973. Collections were made biweekly except for the period of winter ice cover when they were taken at approximately monthly intervals. Biological collections were supplemented with physicochemical determinations of water temperature, dissolved oxygen, and pH. Three sampling stations were selected to physically compartmentalize the quarry waters on the basis of vertical and horizontal differences in habitat types.

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