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We studied the dietary preferences of Antarctic fur seals Arctocephalus gazella from Cap\udNoir, Îles Kerguelen, foraging in the Antarctic Polar Frontal Zone (PFZ) in February of 1998, 1999 and\ud2000. Scats were collected and analyzed for remaining prey hard parts in each of the 3 years, and in\ud1999 and 2000, the fatty acid (FA) composition of fur seal milk samples was also examined for longerterm\uddietary preferences. Scat analyses revealed that seals foraged primarily on fish and some squid in\udall 3 years with 25 species of fish being taken during the study. Myctophid fish accounted for an average\udof 94% by number of all fish consumed with 3 species, Gymnoscopelus nicholsi, G. piabilis and\udElectrona subaspera, forming the core diet. Inter-annual differences in dietary species composition\udwere apparent, however, with the presence of the mackerel icefish Champsocephalus gunnari in 1998\udand the myctophid Protomyctophum tenisoni in 1999 accounting primarily for the differences observed\udbetween years. While reconstituted prey biomass per scat was similar between years, scats\udfrom 1998 represented less energy per gram than those from 1999 and 2000. This study highlights the\udusefulness of using FA signature analysis to confirm longer-term shifts in dietary intake of fur seals using\udmilk samples. Polyunsaturated fatty acids (PUFAs) were significantly more prevalent in the 1999\udmilk samples, which were also lower in overall lipid content (43% vs 53%). G. nicholsi, a particularly\udoily fish, occurred in higher proportions in the diet in 2000, perhaps explaining the higher incidence of\udmonounsaturated fatty acids (MUFAs) in this year and the generally higher lipid levels present in milk\udsamples. The inter-annual variation in the diet of Antarctic fur seals confirmed by these 2 techniques\udlends support to the hypothesis that previously identified variations in oceanographic conditions\udsurrounding Îles Kerguelen in 1998, 1999 and 2000 affect the availability of fur seal prey resources

Antarctic fur seals foraging in the Polar Frontal Zone: inter-annual shifts in diet as shown from fecal and fatty acid analyses