Abstract
The analysis of scats collected between 1989 and 1995 from the two fur seal species resident on subantarctic Marion Island, Arctocephalus gazella and A. tropicalis, showed that they fed predominantly on fish of the family Myctophidae (lanternfishes). Scat composition (prey species, abundance) was very similar for the two species. The seven species of myctophids that formed numerically 90 and 86% of the scat composition for A. gazella and A. tropicalis, respectively, all showed seasonal fluctuations in their contribution to seal diets. Electrona carlsbergi, E. subaspera, Metelectrona ventralis and Gymnoscopelus fraseri increased in winter in both species of fur seals, whereas Gymnoscopelus piabilis, Protomyctophum choriodon and P. tenisoni showed the opposite trend. Seal diets overlapped substantially with those of the king penguins (Aptenodytes patagonicus) resident on Marion Island, but no evidence for competitive exclusion could be found between these two major warmblooded consumers of marine resources at the Prince Edward Islands.
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