WG-CEMP-90

Based on preliminary results of prey size in Adélie penguins, sampling designs intended for detection of interannual variations in prey mean sizes and penguin size related selectivity are analysed for the optimal allocation of observations at each level in nested designs.
Recommended numbers for detection of interannual variability are obtained and a sampling protocol is suggested.
A Read More
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Four successive surveys of the pelagic marine environment were conducted over a 100-by-100 mile study area centered on Elephant Island, Antarctica during January and February 1990. Data were collected to describe the thermohaline structure, the distribution of phytoplankton biomass and primary productivity, the distribution and demography of krill, and the foraging patterns of krill predators Read More
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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 Read More
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The breeding biology of the gentoo penguin, Pygoscelis papua, was studied over a three-year period (1986-1988) at Bird Island, South Georgia, with particular reference to birds of known age or breeding experience. Laying date varied significantly between all three years, being three weeks later in 1987, when the breeding population decreased markedly. Factors involved in the timing of breeding Read More
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Публикация:
Williams, T.D. 1990. Annual variation in breeding biology of gentoo penguins, Pygoscelis papua, at Bird Island, South Georgia. J. Zool., 222(2): 247-258. https://doi.org/10.1111/j.1469-7998.1990.tb05675.x.

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The arrival of Antarctic fur seals at a breeding beach on Bird Island. South Georgia. was studied over five consecutive breeding seasons, 1983 to 1987. Experienced bulls arrived first and established breeding territories on the beaches in anticipation of the arrival of the cows. Male arrival, which is less synchronous within years than female arrival, was significantly later in 1987 than in Read More
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Публикация:
Duck, C.D. 1990. Annual variation in the timing of reproduction in Antarctic fur seals, Arctocephalus gazella, at Bird Island, South Georgia. J. Zool., 222(1): 103-116. https://doi.org/10.1111/j.1469-7998.1990.tb04032.x.

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Regression functions of total length on carapace length and total length on removed carapace length were calculated for Antarctic krill Euphausia superba Dana for those classes of sex and maturity stage which can be discriminated in predator food samples. The use of removed carapace length as a predictor of total length is highly recommended for animals where total length measurement would be Read More
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Публикация:
Hill, H.J.1990. A new method for the measurement of Antarctic krill Euphausia superba dana from predator food samples. Polar Biol., 10: 317–320. https://doi.org/10.1007/BF00238431.

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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 Read More
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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, Read More
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Публикация:
Scolaro, J. A. 1987. Sexing Fledglings and Yearlings of Magellanic Penguins by Discriminant Analysis of Morphometric Measurements. Colonial Waterbirds, 10(1): 50–54. https://doi.org/10.2307/1521230.

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