WG-CEMP-91

Three species of seals around Antarctica have shown quasi-cyclic patterns in some aspect of their biology: the age structure of crabeater seals (Lobodon carcinophagus) around the Antarctic Peninsula has shown strong cohorts separated by 4- to 5-yr intervals; juvenile leopard seals (Hydrurga leptonyx) have appeared in unusually large numbers at Macquarie Island, also at 4- to 5-yr intervals; Read More
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We contrast the depth, duration and pattern of diving in the epipelagic-foraging Gentoo Penguin (Pygoscelis papua) and the benthic-foraging Blue-eyed Shag (Phalacrocorax atriceps). The daily foraging period was 8 hours in both species, but Gentoos spent 50% of this time diving compared to 20% in Shags. Shags had longer surface intervals between dives than Gentoos, with a higher incidence of Read More
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The age distribution of breeding female Antarctic fur seals at Bird Island, South Georgia, in 1988 was compared with the age distribution of a sample obtained in 1971-1973. The mean age in 1971-1973 was 7.41 (SE = 0.26) years and in 1988 it was 6.93 (SE = 0.20) years. After correction for age-dependent arrival time at the pupping beach in 1988, the mean age was 6.22 (SE = 0.14 years), which Read More
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Published in J. Mamm., 72(1),000-000, 1991

Zones of 20 km width are defined around selected colonies of penguins distributed around the coasts of the South Shetland and South Orkney islands. Krill catches in these zones are shown to have a consistent pattern in Subarea 48.1 but an unpredictable distribution in 48.2, probably as a result of oceanographic conditions. About 50% of the catch in 48.1 from December to March was taken within Read More
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Complexity of direct determination o£ production intensity obliges the investigators to use indirect methods.In this work the method of calculation is based on the estimate of winter biogenous matter accumulation decrease in the upper layer,comparatively with underlayer,in summer period.
The calculation showed considerable interannual changeability of production intensity,having the Read More
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The ability to determine the sex of Adélie penguins by discriminant analysis of morphometric parameters was examined for breeding birds of known sex at Bechervaise Island near Mawson Station, Antarctica (latitude 67°36’S, longitude 62°53’E). It was found that 89 % of birds could be correctly sexed by comparing the discriminant score D = 0.582 (bill length) + 1.12 (bill depth) + 0.219 (flipper Read More
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