Discriminant analysis was used to identify the sexes of fledglings and yearlings in the Magellanic Penguin (Spheniscus magellanicus). Eleven morphometric measurements were recorded in a sample of 102 fledglings and 140 yearlings from the breeding stock at Punta Clara, Chubut, Argentina. Total (body) length and bill depth were the most useful variables for discriminating between age classes, followed by length of the middle toe and bill length. Yearling, besides being distinguishable by plumage, were invariably bigger than fledglings. For distinguishing the sexes among yearlings, bill depth and tarsus length proved useful; 95.7% of cases were correctly classified (Chi square, p
Abstract:
A survey of Antarctic fur seals (Arctocephalus gazella) in the South Shetland Islands, Antarctica, during the 1986/87 austral summer indicated that this species is continuing its population recovery and recolonization of rookery sites following 19th Century commercial exploitation. Eleven fur seal pupping sites were identified, some of which had not previously been reported. The largest pupping sites were at Telmo Island and Cape Shirreff, Livingston Island, and at the Seal Islands, Elephant Island. Total fur seal pup production in the South Shetland Islands in 1986/87 was estimated to be approximately 4000 individuals.
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There is no abstract available for this document.
Abstract:
Based on dietary and other biological information collected over several years at Bird Island, South Georgia and at the South Shetland Islands (both within Integrated Study Regions (ISR’s) of the CCAMLR Ecosystem Monitoring Programme (CEMP)), we suggest (and provide a full bibliography of supporting literature) that the Gentoo penguin meets the specified criteria qualifying species for inclusion in the CEMP. The extensive dependence of this species in these ISR’s on Euphausia superba, (including in winter), its residence in the ISR’s in winter and its early attainment of sexual maturity are all features of special relevance to the CEMP.