EARLY SPRING FEEDING-HABITS OF BEARDED SEALS (ERIGNATHUS-BARBATUS) INTHE CENTRAL BERING SEA, 1981

The diet of bearded seals, Erignathus barbatus, near St. Matthew Islan d, Bering Sea, was studied during the early spring of 1981. Eighty-six percent of the 78 seals' stomachs examined contained fish. Other prey taxon groups, in decreasing order of their percentages of occurrence, were crabs (73%), clams (55%), snails (47%), amphipods (32%), shrimp (18%), mysids (13%), marine worms (13%) and cephalopods (4%). The most frequently occurring prey species were capelin, Mallotus villosus (82 %); codfishes, Gadidae (64%); narrow snow crab, Chionoecetes opilio (6 3%); eelpouts, Lycodes spp. (56%); longsnout prickelback, Lumpenella l ongirostris (49%); nutshell clams, Nuculana sp. (42%); and moon snails , Polinices sp. (27%). Seventy-seven percent of the seals examined had consumed prey from three or more different taxon groups. We identifie d seven food items not previously reported as prey of the bearded seal in the Bering Sea. No differences were detected between the diets of males and females and between adults and juveniles, indicating no appa rent segregation of foraging by sex or age. Bearded seals in the St. M atthew Island region of the Bering Sea forage in a manner similar to t heir conspecifics in other areas where fish constitute a major portion of their diet. Prey selection is probably dependent on availability, and diet may be highly diversified even within a relatively small area during a short period of time. Variety in prey consumption exemplifie s the ability of the bearded seal to forage in the seasonally changing habitat associated with the advance and retreat of the ice front.