Thesis

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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 use of artificial substrates to ascertain the faunal difference between an agricultural drainage ditch and a third order river in south central Minnesota

Fylpaa, John W
The purpose of this study was to ascertain which of three artificial substrate samplers best discriminated between a river and an agricultural drainage ditch environment in south central Minnesota. The aquatic macro-invertebrates associated with three different artificial substrates, multi-plate (MP), rock filled basked (RFB) and nylon mesh bag on a brick (MBB) were collected to determine the effectiveness of the artificial substrate in a variety of sediment conditions.

An assessment of cultural influence of lakes of south central Minnesota by short core sediment analysis

Olson, John S
This study involved the analysis of the relationships of sediment chemistry to lake morphometric and basin descriptors. The sediment chemistry analysis involved calcium, sodium, potassium, iron, percent organic, and the chlorophyll derivative to carotenoid pigment ratios. The morphometric descriptors included area, mean depth, maximum depth, volume, volume development index, shoreline, and shoreline development index. The lake basin descriptors included soil type, soil hydrology, lake isolation and lake formation.

Nutrient Accumulation, Decomposition and sedimentation of aquatic macrophytes in southern Minnesota

Hill, Brian H
Five species of aquatic macrophytes from an agricultural drainage ditch and a second-order stream were analyzed for nitrogen, phosphorus and ash throughout the 1976 growing season. These macrophytes were observed to accumulate large amounts of these nutrients from the sediment and water. Determination of correlation coefficients showed that there was little or no significant correlation between nutrients in the water and in the plant tissue.

Evaluation of Potamogeton pectinatus as a tool for phosphorus removal

Ribikawskis, Matthew J
This study examined the potential of transplanted Potamogeton pectinatus (sago pondweed) to be used as an effective tool to remove phosphorus from a hypereutrophic lake. Field studies showed growing P. pectinatus from tubers in-lab and then transplanting into enclosed structures within Crystal Lake, Minnesota, promoted positive plant growth and phosphorus uptake. While planted within Crystal Lake, mean increases per plant were found in shoot length (11.21 mm SE±15.70), in root length (89.95 mm SE± 16.20), and in total dry weight (0.45 g SE±0.11).

A Comparative Water Quality Study of man-made drainage ditches and natural streams in south central Minnesota

Boyum, Kent W
The effects of man-made agricultural drainage ditch systems on the water quality of receiving bodies has not been documented. This study examined a four county area in south central Minnesota, dominated by agriculture. Thirteen drainage ditches and four natural streams in Blue Earth, Le Sueur, Nicollet, and Brown Counties were sampled during the ice free season of 1979. The study year was a wet year resulting in most of the water entering the drainage ditches as overland flow.

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