Influence of tundra swans on aquatic vegetation and staging waterfowl at Long Point, Ontario / Shannon Scott Badzinski
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TextPublication details: London, ON : University of Western Ontario, 2003Description: xvi, 166 leaves : ill. ; 29 cmOnline resources: Abstract: Over the past several decades, Tundra Swan (Cygnus columbianus)populations have increased considerably in North America causing concern that large numbers of swans may influence aquatic plant and waterfowl communities at key staging areas. Thus, this study was done to determine if: 1) swans reduce seasonal abundance of squatic plants, 2) abundance,proximity, and foraging activity of swans affect abundance,distribution, and activities of other staging waterfowl, 3) swan proximity and foraging activity affect activities and feeding methods of foraging American Black Ducks (Anas rubripes) and Mallards (Anas platyrhynchos). Exclosure experiments done in aquatic habitats showed that swans did not greatly reduce availability of aquatic plants during fall. Observations also suggested that swans did not greatly reduce food availability for ducks because they fed less than did smaller waterfowl.Overall, waterfowl densities were not negatively correlated with swan densities in large marsh c
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Thesis(Ph.D.)--University of Western Ontario, 2003.
Includes bibliographical references.
Over the past several decades, Tundra Swan (Cygnus columbianus)populations have increased considerably in North America causing concern that large numbers of swans may influence aquatic plant and waterfowl communities at key staging areas. Thus, this study was done to determine if: 1) swans reduce seasonal abundance of squatic plants, 2) abundance,proximity, and foraging activity of swans affect abundance,distribution, and activities of other staging waterfowl, 3) swan proximity and foraging activity affect activities and feeding methods of foraging American Black Ducks (Anas rubripes) and Mallards (Anas platyrhynchos). Exclosure experiments done in aquatic habitats showed that swans did not greatly reduce availability of aquatic plants during fall. Observations also suggested that swans did not greatly reduce food availability for ducks because they fed less than did smaller waterfowl.Overall, waterfowl densities were not negatively correlated with swan densities in large marsh c