REPRODUCTIVE SYNCHRONY AND THE ESTIMATION OF MEAN DATE OF BIRTH FROM DAILY COUNTS OF NORTHERN FUR SEAL PUPS

A bstract Two methods for estimating the mean date of birth from daily counts of northern fur seal pups ( Callorhinus ursinus ) are presented and applied to data collected on the Pribilof Islands in 1951, 1962, 1963 and 1983. The mean date of birth over the four years was July 9. Reproduction is hig...

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Bibliographic Details
Published in:Marine Mammal Science
Main Author: Trites, Andrew W.
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 1992
Subjects:
Aquatic Science
Ecology, Evolution, Behavior and Systematics
Callorhinus ursinus
Northern fur seal
Online Access:http://dx.doi.org/10.1111/j.1748-7692.1992.tb00124.x
https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.1992.tb00124.x
https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.1992.tb00124.x
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Summary:A bstract Two methods for estimating the mean date of birth from daily counts of northern fur seal pups ( Callorhinus ursinus ) are presented and applied to data collected on the Pribilof Islands in 1951, 1962, 1963 and 1983. The mean date of birth over the four years was July 9. Reproduction is highly synchronized and consistent from one year to the next. Pupping occurs over a five week period with over 50% of the pups being born during the first two weeks of July.

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