Clutch size and initiation date of ospreys: natural patterns and the effect of a natural delay

• Published in: Canadian Journal of Zoology
• Main Authors: Steeger, Christoph, Ydenberg, Ronald C.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Canadian Science Publishing 1993
• Subjects: Animal Science and Zoology; Ecology, Evolution, Behavior and Systematics; Canada; British Columbia; Branta canadensis; Pandion haliaetus
• Online Access: http://dx.doi.org/10.1139/z93-300; http://www.nrcresearchpress.com/doi/pdf/10.1139/z93-300

We studied the breeding performance of ospreys (Pandion haliaetus) in southeastern British Columbia from 1987 to 1990. Clutch size, brood size, and the number of young fledged per nest all declined significantly as clutch initiation date was delayed. The quality of later born young as measured by gr...