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Recent Paleolimnology of Three Lakes in Northwestern Minnesota

Published online by Cambridge University Press:  20 January 2017

Hilary H. Birks
Affiliation:
Limnological Research Center, University of Minnesota, Minneapolis, Minnesota 55455, USA
M.C. Whiteside
Affiliation:
Limnological Research Center, University of Minnesota, Minneapolis, Minnesota 55455, USA
Donna M. Stark
Affiliation:
Limnological Research Center, University of Minnesota, Minneapolis, Minnesota 55455, USA
R.C. Bright
Affiliation:
Limnological Research Center, University of Minnesota, Minneapolis, Minnesota 55455, USA

Abstract

A paleolimnological study was undertaken to investigate changes in three Minnesota lakes over the last 100 years and to demonstrate the stratigraphic effects of cultural eutrophication in two of them. The study combined the analysis of the lake sediment from short cores with stratigraphic analyses of pollen, plant macrofossils, mollusks, diatoms and certain other algae, chydorid Cladocera, and Daphnia ephippia.

The rise of Ambrosia type pollen (ragweed) marks the onset of interference with the landscape by European man, which can be closely dated. Calculations of sedimentation rates from this base gave reasonable correlations of other stratigraphic events with historical events.

Elk Lake is considered “unpolluted” today and was chosen as a control. Man's effects are limited to logging some of the surrounding forest and to the construction of a dam. Small changes in the lake's fauna and flora are demonstrated, showing the sensitivity of the lake to changes in its catchment area.

Lake Sallie and St. Clair Lake, in the same watershed as the city of Detroit Lakes, have been affected not only by logging but also by addition of nutrients from agricultural runoff and sewage effluent. Considerable responses by the lake organisms are apparent. In Lake Sallie the changes were gradual, but in St. Clair Lake they were very abrupt because the lake was partially drained at the same time and the water volume was thereby reduced.

The merits of such an integrated study, the types of information gained from the analyses of the various fossils, and the wider application of the results are discussed.

Type
Research Article
Copyright
University of Washington

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