Reproductive synchrony and the estimation of mean date of birth from daily counts of Northern fur seal pups

摘要: Two methods for estimating the mean date of birth from daily counts northern fur seal pups (Callorhinus ursinus) are presented and applied to data collected on Pribilof Islands in 1951, 1962, 1963 1983. The over four years was July 9. Reproduction is highly synchronized consistent one year next. Pupping occurs a five week period with 50% being born during first two weeks July.