The diet of Antarctic fur seals during the late autumn and early winter around Heard Island

[摘要] The diet of Antarctic fur seals around Heard Island was investigated in May and June 1990. Fish predominated in samples, occurring in an average of 93.4% of droppings. Otoliths from pelagic fish (mainly myctophids) constituted over 96% of all otoliths. There was an increase in the occurrence of squid from 3.4% in summer 1987/88 to 49.3% in the present study. For the fish species Gymnoscopelus nicholsi (Gilbert), 10.3% of otoliths recovered from scats were considered suitable for measurement compared with 30.5% from scats at Heard Island in 1987/88; this greater level of erosion provides further evidence that the seals were foraging further afield. The study demonstrates a significant difference between summer 1987/88 and winter 1990.

[学科分类] 自然科学（综合）