WG-CEMP-92

El estudio de la ecologia de Arctocephalus gazella encabo Shirreff se inició en el año 1981 con financiamiento del Instituto Antártico Chileno, el cual rue suspendido en 1985 y 1986 por razones logisticas y reanudado en 1987. Sus principalesresultados indican un aumento constante del tamaño de la población (Aguayo et al., 1992)...

“Standard methods in video” was prepare to improve standarization of data collection for different groups that are working in CEMP.
It was made under recommendation of WG CEMP) (Stockholm 1990) endorsed by the Scientific Committee ( Report Ninth Meeting of the Scientific Committee pag 38 5.17). The video was made in PAL N system.

“The penguins and the man” is a video made with the three main goals, the first two are general, for the scientific communities and the third is an specific one, to introduce argentine people involved in work for CEMP.
1.- The first objective is to show basic biology of adelie penguins necesary to understand principles of CEMP standard methods.
2.- The second is to introduce Read More
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A census of the breeding population of Antarctic fur seals (Arctocephalus gazella) at South Georgia was carried out during the 1990/91 breeding season. Using counts of adult females ashore at the breeding grounds during the pupping period, together with corrections for the likelihood of a female being ashore at a census and for pregnancy rate (71 % in 1990/91), pup production was estimated as Read More
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We studied diving patterns and performance (dive depth, duration, frequency and organization during the foraging trip) in relation to diet in nonbreeding Gentoo Penguins (Pygoscelis papua) over 59 days (involving 5,469 dives) in winter. We estimated foraging ranges and prey capture rates, and compared foraging behavior with that of breeding (chick-rearing) birds. Foraging was highly diurnal Read More
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The foraging ranges of six female and four male Adélie penguins breeding at Bechervaise Island near Mawson Station (Mac. Robertson Land) were determined by satellite tracking, using the ARGOS system. Birds were tracked over four foraging trips (by 2 females and 4 males) during the incubation period (November-December 1991) and 17 trips (by 4 females and 2 males) throughout January 1992 when Read More
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Temporal and spatial variability of krill distribution features was investigated at the micropolygon of 8 x 6 miles, where eight consecutive hydroacoustic stations were carried out. Krill aggregations occurred as fields of small swarms of spatial distribution features (size and density of swarms, swarm field density, number of swarms per one mile) varied considerably from tack to tack within Read More
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From 18 to 23 April hydroacoustic, oceanological and trawling surveys were carried out within the square of 30 x 30 miles northwestwards of Coronation Island in the fishing fleet operation area. The krill biomass was estimated within the square at the start and the end of works. It amounted to 56.1 thous. t and 61.2 thous. t respectively. During the period remained the hydroacoustic assessment Read More
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The oceanological, hydroacoustic and trawling surveys were carried out within the polygon of 30 x 30 miles in the fishing area northwestward of Coronation Island in 18-22 April,1992. The krill biomass was estimated in the beginning and at the end of surveys. It amounted to 56.1 and 61.2 thous. t respectively. During the rest of the period the hydroacoustic assessment of krill aggregation Read More
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Calculation of drift’s speed (transport with current) of Antarctic krill along the northeastern shore of South Georgia Island (between 54-55S and 34-39W) were carried out. Length of island’s shelf for calculation was assumed about 300 km, but average width of shelf (from shore to 500 m isobate) was assumed about 60 km. Speed of drift in these spatial limits was assumed about 10 cm sec-1. The Read More
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Data on distribution and biomass of E.superba aggregations at Atlantic sector and near adjacent waters (subregions outside of the Scotia Sea are under pecular attention) are observed° Concentration of E.superba of the same order of biomass volume as in the Scotia Sea were observed at several subregions along the peripherie of Weddell Gyre and also nearshore of Antarctide. Offshore Read More
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Microscale data, described the Soviet krill fishery off the Elephant Island (Subarea 48.1) between 59°-62°S and 53°-57°W during the period from 21.11.1988 to 25.03.1989, are analysed. Though the catch of the USSR in the above-mentioned season reached maximum, the total fishery intensity for the last 9 seasons was low and only 1 standard vessel operated in the area during 40% of the period. The Read More
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A nest ANOVA design was used to measure the variance component due to differences between individual penguins in the length of krill eaten by Adélie penguins at Esperanza Bay. The value found was not different from zero: variance component = -0.16; F = 0.93; P = 0.54. This finding supports the use of individual penguins to estimate parameters of the prey population without discriminating by Read More
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Since parameters of penguin populations may provide good indices of the abundance of the key prey species (krill) and thus the state of the Antarctic marine ecosystem, aerial reconnaissance and photography are used in the Ross Sea sector of Antarctica to determine where Adelie penguins (Pygoscelis adeliae) breed, and to count the numbers of nests occupied during the early incubation period and Read More
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Aerial reconnaissance and photography were used in the Ross Sea sector of Antarctica to determine the breeding locations of Adé1ie penguins Pygoscelis adeliae, and to count the numbers of nests occupied during the early incubation period. From 1981 to 1987, all islands and sea coasts between 158°E and 175°E were searched, and 11 previously unreported breeding rookeries were discovered. Thirty- Read More
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The numbers of Adelie penguins Pygoscelis adeliae (Hombron and Jacquinot) in the Ross Sea, Antarctica, have increased markedly over the past 10 years. Proportionally, this increase is most pronounced in McMurdo Sound, where the species’ breeding range has recently been extended 3 km south to Cape Barne (77°35’S) with the re-occupation of a former rookery that was abandoned sometime before the Read More
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The population dynamics of the Cape Royds rookery were modelled by computer, in order to determine the probable causes of the dramatic increase since 1980 in the numbers of Adelie penguins, Pygoscelis adeliae, breeding in the Ross Sea region, Antarctica.
Variations in the extent of sea-ice around the rookery during incubation and chick rearing cannot feasibly explain the population Read More
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A System that automatically weighs, identifies and determines the direction of penguins moving between their breeding colony and the sea is described. Data obtained from it for a complete colony (589 nests from which 412 chicks were fledged) and related to the foraging ecology of the Adélie penguin Pygoscelis adeliae are presented for the period hatching to fledging. These were obtained at Read More
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Krill distribution and abundance were estimated from four acoustic surveys, conducted in the vicinity of Elephant Island, Antarctica, from mid-January to mid-March, 1992. The first and last surveys covered a 105 by 105 n.mi. study area centered on Elephant Island; the second and third surveys covered a 60 by 35 n.mi. area immediately north of Elephant Island. During the first survey, krill Read More
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In sexually dimorphic species, morphometric parameters have separate distributions for males and females, and these often overlap. Whilst discriminant analysis can be used to determine the sex of individuals, it is only able to correctly sex a certain proportion of birds. Two overlapping normal distributions are used to show that there is a difference between the real mean parameter for a sex Read More
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