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- W40248662 abstract "The reproductive ecology of ospreys, Pandion haliaencr, breeding at two locations in the Kootenay region of British Columbia, was studied in 1987 and 1988. The types of nest sites used and the feeding ecology were very different at the two locations. The areas also differed slightly in breeding chronology and egg size, but clutch size, hatching success and fledging success did not differ. There was a marked seasonal decline in reproductive success, with later-breeding pairs fledging fewer young than early breeders. The decline was steeper in 1987 than in 1988, but in both years was almost entirely attributable to a seasonal decline in clutch size. In 1987 egg mortality also contributed. As measured by growth rate and the number and intensity of fault bars in rectrices, the quality of fledglings did not decline during the season, and some evidence suggested that late-hatched chicks were fed more than early chicks. Weather records and measurements of male hunting performance indicated that food availability (infuenced by weather) or male (and territory) quality could not explain the observed seasonal decline. The pattern is consistent with the hypothesis that late breeders reduce clutch size in order to be able to invest more in each chick to offset the inherent disadvantage that late fledglings have. The reasons for this, and mechanisms whereby variation in the timing of breeding could be maintained under selection, are discussed." @default.
- W40248662 created "2016-06-24" @default.
- W40248662 creator A5053605658 @default.
- W40248662 date "1989-01-01" @default.
- W40248662 modified "2023-09-23" @default.
- W40248662 title "Proximate and ultimate aspects of seasonal variation in the reproductive performance of ospreys" @default.
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- W40248662 hasPublicationYear "1989" @default.