Dabbling duck and aquatic invertebrate responses to manipulated wetland habitat / Richard M. Kaminski.
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TextPublication details: MI : Michigan State University, 1979.Description: viii, 62 leaves : ill. ; 28 cmOnline resources: Abstract: A 2-year study was conducted on a 33-ha impoundment in the Delta Marsh,south-central Manitoba (50 degrees 11'N, 98 degrees 19'W), to test the effects of manipulations of emergent hydrophytes and basin substrate on several parameters for breeding dabbling ducks (Anatini) and aquatic invertebrates. Replicate square plots (1 ha) were established which provided one of 3 areal percentage ratios of emergent vegetation to open water (30:70, 50:50, or 70:30), and one of 2 basin treatments (mowed vegetation or scarification by rototilling). Between years, numbers of mallard (Anas platyrhynchos) and blue-winged teal (A. discors) pairs declined significantly while pair numbers of northern shovelers (A.clypeata), gadwall (A. strepera), and pintail (A. acuta) were comparable. Weather was not confounded with habitat treatments on species-pair numbers in 1977 or 1978. The greatest density and species diversity of dabbler pairs occurred on 50:50 plots in both years. The response appeared linked to
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Thesis(Ph.D.)--Michigan State University, 1979.
Includes bibliographical references (leaves 56-62).
A 2-year study was conducted on a 33-ha impoundment in the Delta Marsh,south-central Manitoba (50 degrees 11'N, 98 degrees 19'W), to test the effects of manipulations of emergent hydrophytes and basin substrate on several parameters for breeding dabbling ducks (Anatini) and aquatic invertebrates. Replicate square plots (1 ha) were established which provided one of 3 areal percentage ratios of emergent vegetation to open water (30:70, 50:50, or 70:30), and one of 2 basin treatments (mowed vegetation or scarification by rototilling). Between years, numbers of mallard (Anas platyrhynchos) and blue-winged teal (A. discors) pairs declined significantly while pair numbers of northern shovelers (A.clypeata), gadwall (A. strepera), and pintail (A. acuta) were comparable. Weather was not confounded with habitat treatments on species-pair numbers in 1977 or 1978. The greatest density and species diversity of dabbler pairs occurred on 50:50 plots in both years. The response appeared linked to