Evaluation of drawdown in southern Manitoba marshes : D.B. Wark and T.J.V. Sopuck. 1981 - 1983 /
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TextPublication details: Winnipeg, MB : 1984. Ducks Unlimited Canada,Description: iii, 66 p. : col. ill. , maps ; 28 cmOnline resources: Abstract: The drawdown is a natural and effective tool for maintaining the productivity of a wetland (Kadlec 1962). A dramatic or total drawdown involves removing all surface water from a basin for one or more growing seasons. Most emergent species spread rapidly and increase in abundance as a result of a drawdown, as many of these plants require an exposed soil seed bed for germination. In addition to macrophyte expansion dramatic drawdowns tend to recycle nutrients making them available to aquatic vegetation (Harris and Marshall 1963, Kadlec 1962). Generally,upon reflooding a far more heterogeneous environment exists. Many investigators have reported increased avifaunal use in response to the improved habitat conditions. Most marsh bird species were found to favor wetlands in a hemimarsh stage with a ratio of approximately 1:1 cover-water interspersion (Kadlec 1962, Weller and Spatcher 1965 in Weller 1978, Kaminski and Prince 1981). Muskrats also respond quickly to improved conditions and in
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Electronic Report
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Electronic Library | Non-fiction | WAR (Browse shelf(Opens below)) | Available | March 1984 Report | 15769 | |
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Electronic Report
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Electronic Library | Non-fiction | WAR (Browse shelf(Opens below)) | Available | June 1984 Report | 1381 |
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Includes bibliographical references (p. 66).
The drawdown is a natural and effective tool for maintaining the productivity of a wetland (Kadlec 1962). A dramatic or total drawdown involves removing all surface water from a basin for one or more growing seasons. Most emergent species spread rapidly and increase in abundance as a result of a drawdown, as many of these plants require an exposed soil seed bed for germination. In addition to macrophyte expansion dramatic drawdowns tend to recycle nutrients making them available to aquatic vegetation (Harris and Marshall 1963, Kadlec 1962). Generally,upon reflooding a far more heterogeneous environment exists. Many investigators have reported increased avifaunal use in response to the improved habitat conditions. Most marsh bird species were found to favor wetlands in a hemimarsh stage with a ratio of approximately 1:1 cover-water interspersion (Kadlec 1962, Weller and Spatcher 1965 in Weller 1978, Kaminski and Prince 1981). Muskrats also respond quickly to improved conditions and in