Publication Type: | Journal Article |
Year of Publication: | 1983 |
Authors: | Bechard, MJ |
Journal: | The Wilson Bulletin |
Volume: | 95 |
Issue: | 2 |
Date Published: | 1983 |
ISBN Number: | 00435643 |
Keywords: | Accipitridae, Buteo, Buteo swainsoni, Buteo swainsonii |
Abstract: | Clutch-size, brood-size, and fledging success were observed at 96 Swainson's Hawk (Buteo swainsoni) nests in both grazed and cultivated habitats in southeastern Washington. Except in 1977, nests in cultivated habitats fledged fewer young. Decreased fledging success resulted from high mortality of youngest and next youngest nestlings. Using nestling weight as an index of food supply, decreases in nestling weight and increases in weight discrepancies between youngest and oldest nestlings in cultivated habitats indicated that a dearth of food increased the incidence of brood reduction. These data supported the food-limited hypothesis for the adaptive significance of hatching asynchrony in this species. |
URL: | http://www.jstor.org/stable/4161753 |
Short Title: | The Wilson Bulletin |
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