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    Disturbance Effects on Aquatic Vegetation in Regulated and Unregulated Lakes in Northern Minnesota

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    Author
    Wilcox, Douglas A.
    Meeker, James E.
    Keyword
    Reservoirs
    Lake-Level Regulation
    Winter Drawdown
    Aquatic Vegetation
    Growth Form
    Disturbance
    Journal title
    Canadian Journal of Botany
    Date Published
    1991-01-01
    Publication Volume
    69
    Publication Issue
    7
    
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    URI
    http://hdl.handle.net/20.500.12648/2310
    Abstract
    The effects of water-level regulation on aquatic macrophyte communities were investigated by comparing two regulated lakes in northern Minnesota with a nearby unregQlated lake. Natural annual fluctuations of about 1.8 m were replaced with fluctuations of 1.1 m and 2. 7 m in the regulated lakes, and the timing of water-level changes was also altered. Quadrats were sampled along transects that followed depth contours representing different plant habitats in the unregulated lake. Ordinations showed that the macrophyte communities at all sampled depths of the regulated lakes differed from those in the unregulated lake. The unregulated lake supported structurally diverse plant communities at all depths. In the lake with reduced fluctuations, only four taxa were present along transects that were never dewatered; all were erect aquatics that extended through the entire water column. In the lake with increased fluctuations, rosette and mat-forming species dominated transects where drawdown occurred in early winter and disturbance resulted from ice formation in the sediments. The natural hydrologic regime at the unregulated lake resulted in intermediate disturbance and high diversity. There was either too little or too much disturbance from water-level fluctuations in the regulated lakes, both resulting in reduced structural diversity.
    DOI
    https://doi.org/10.1139/b91-198
    Description
    Canadian Journal of Botany, 1991, Vol. 69, No. 7 : pp. 1542-1551 Disturbance effects on aquatic vegetation in regulated and unregulated lakes in northern Minnesota Douglas A. Wilcox, James E. Meeker (doi: 10.1139/b91-198) http://pubs.nrc-cnrc.gc.ca --- Contribution No. 769 of the National Fisheries Research Center Great Lakes, Ann Arbor, MI 48105, U.S.A.
    ae974a485f413a2113503eed53cd6c53
    https://doi.org/10.1139/b91-198
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    Environmental Science and Ecology Faculty Publications

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