Breeding biology and habitat selection of American crows in Saskatchewan parkland habitat / Jordan B. Ignatiuk
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TextPublication details: Montreal, QC : McGill University, 1991.Description: xiv, 79 leaves : ill. ; 28 cmOnline resources: Abstract: The breeding biology and nest-site selection of American crows (Corvus brachyrhynchos) was studied in 2 differing areas of aspen parkland habitat in Saskatchewan in 1987 and 1988. The study focused on comparisons of density, reproductive biology, and nest-site selection in these two areas. Crows returned from winter ranges in early April and nest building began by the end of the month. Overall, density of nests at St. Denis (0.70/km2) averaged twice that found at Elstow (0.35/km2)and clutches were initiated earlier at St. Denis (x- +- SD = 6 May +- 6 days) than at Elstow (10 May +- 6 days). Clutch size and hatching success did not differ between years or areas, but in 1987, nests at St.Denis produced nearly twice as many young as at Elstow. Crows nested in willow (Salix spp., n = 74), aspen (Populus tremuloides, m = 52), and other trees (n-9). Nest trees were larger than randomly-selected trees in both years and areas. At St. Denis, the area near active crow nests had, on average, m
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Thesis(M.Sc.)--McGill University, 1991.
Includes bibliographical references (leaves 56-59).
The breeding biology and nest-site selection of American crows (Corvus brachyrhynchos) was studied in 2 differing areas of aspen parkland habitat in Saskatchewan in 1987 and 1988. The study focused on comparisons of density, reproductive biology, and nest-site selection in these two areas. Crows returned from winter ranges in early April and nest building began by the end of the month. Overall, density of nests at St. Denis (0.70/km2) averaged twice that found at Elstow (0.35/km2)and clutches were initiated earlier at St. Denis (x- +- SD = 6 May +- 6 days) than at Elstow (10 May +- 6 days). Clutch size and hatching success did not differ between years or areas, but in 1987, nests at St.Denis produced nearly twice as many young as at Elstow. Crows nested in willow (Salix spp., n = 74), aspen (Populus tremuloides, m = 52), and other trees (n-9). Nest trees were larger than randomly-selected trees in both years and areas. At St. Denis, the area near active crow nests had, on average, m