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    Cattail Invasion of Sedge/Grass Meadows in Lake Ontario: Photointerpretation Analysis of Sixteen Wetlands over Five Decades

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    Author
    Wilcox, Douglas A.
    Kowalski, Kurt P.
    Hoare, Holly L.
    Carlson, Martha L.
    Morgan, Heather N.
    Keyword
    Lake-Level Regulation Plans
    Lake Ontario
    Meadow Marsh
    Photointerpretation
    Typha
    Wetlands
    Journal title
    Journal of Great Lakes Research
    Date Published
    2008-01-01
    Publication Volume
    34
    
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    URI
    http://hdl.handle.net/20.500.12648/2294
    Abstract
    Photointerpretation studies were conducted to evaluate vegetation changes in wetlands of Lake Ontario and the upper St. Lawrence River associated with regulation of water levels since about 1960. The studies used photographs from 16 sites (four each from drowned river mouth, barrier beach, open embayment, and protected embayment wetlands) and spanned a period from the 1950s to 2001 at roughly decadal intervals. Meadow marsh was the most prominent vegetation type in most wetlands in the late 1950s when water levels had declined following high lake levels in the early 1950s. Meadow marsh increased at some sites in the mid-1960s in response to low lake levels and decreased at all sites in the late 1970s following a period of high lake levels. Typha increased at nearly all sites, except waveexposed open embayments, in the 1970s. Meadow marsh continued to decrease and Typha to increase at most sites during sustained higher lake levels through the 1980s, 1990s, and into 2001. Most vegetation changes could be correlated with lake-level changes and with life-history strategies and physiological tolerances to water depth of prominent taxa. Analyses of GIS coverages demonstrated that much of the Typha invasion was landward into meadow marsh, largely by Typha × glauca. Lesser expansion toward open water included both T. × glauca and T. angustifolia. Although many models focus on the seed bank as a key component of vegetative change in wetlands, our results suggest that canopy-dominating, moisture- requiring Typha was able to invade meadow marsh at higher elevations because sustained higher lake levels allowed it to survive and overtake sedges and grasses that can tolerate periods of drier soil conditions.
    Citation
    J. Great Lakes Res. 34:301–323 Internat. Assoc. Great Lakes Res., 2008
    Description
    Authors Wilcox, Kowalski, Hoare, and Carlson were government employees when this article was written.
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    Environmental Science and Ecology Faculty Publications

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