A study of waterfowl nesting on artificial islands in southeastern Alberta / Jean-Francois Giroux.
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TextPublication details: Edmonton, AB : University of Alberta, 1979.Description: xiv, 98 leaves : ill. ; 28 cmOnline resources: Abstract: Use by nesting waterfowl of artificial islands created in impoundments of water in southeastern Alberta was studied from 1976 to 1978. A total of 1205 nests of 12 species of ducks and 144 nests of Canada geese (Branta canadensis) were found on the islands searched. Density of nesting ducks in the different impoundments varied between 2.3 and 29.1 nests per ha of which between 43 and 59% successfully hatched at least 1 egg. Mammalian predation was the main cause of nest failure. Greatest densities were recorded in 1977 when drought conditions were most pronounced; water persisting in the artificial impoundments seemed to attract waterfowl to nest on the islands. Mallard (Anas platyrhynchos),gadwall (A. strepera) and lesser scaup (Aythya affinis) were selecting islands to a greater extent than the other species of waterfowl found in the area. Of the 203 islands studied, 107 were used by Canada geese;they initiated an average of 1.35 nests per island and had a success rate of 70%. By c
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Thesis(M.Sc.)--University of Alberta, 1979.
Includes bibliographical references.
Use by nesting waterfowl of artificial islands created in impoundments of water in southeastern Alberta was studied from 1976 to 1978. A total of 1205 nests of 12 species of ducks and 144 nests of Canada geese (Branta canadensis) were found on the islands searched. Density of nesting ducks in the different impoundments varied between 2.3 and 29.1 nests per ha of which between 43 and 59% successfully hatched at least 1 egg. Mammalian predation was the main cause of nest failure. Greatest densities were recorded in 1977 when drought conditions were most pronounced; water persisting in the artificial impoundments seemed to attract waterfowl to nest on the islands. Mallard (Anas platyrhynchos),gadwall (A. strepera) and lesser scaup (Aythya affinis) were selecting islands to a greater extent than the other species of waterfowl found in the area. Of the 203 islands studied, 107 were used by Canada geese;they initiated an average of 1.35 nests per island and had a success rate of 70%. By c