Population structure of a non-breeding colony of the cape fur seal arctocephalus pusillus pusillus at Cape Frio, Namibia

摘要: The age and sex composition at a large non-breeding colony of the Cape fur seal Arctocephalus pusillus Frio, Namibia, are described. A ground estimate indicated that there were approximately 20 000 seals all groups both sexes during September 1989, around two months before pupping season. ratio sampled was 1.61 : 1 (n = 107, 61.7% male). Most males immature, 2- 3-year-olds, although some older, mature bulls present colony. In contrast, only 9.8% females sexually immature 80.5% older than 13 years. None young reproductively active had reduced reproductive rates. Reproductive status differed from other breeding colonies.