WS-AREA 48-98

The sea surface temperature dataset of Reynolds and Smith (1994) was used to describe variability around South Georgia. High levels of autocorrelation were evident in the sea surface temperature anomalies, with periodicity evident at a lag period of 4 years. To the north of the island significant autocorrelation was also evident at a lag period of 1 year; though this was restricted to an area Read More
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Acoustic estimates of the densities of Antarctic krill, Euphausia superba, in areas around South Georgia (SG) and Elephant Island (El) were compared for seven austral summers between 1981 and 1997. Estimated densities of krill at El were most often higher than at SG, although this may simply have been a function of differences in survey and data analysis techniques used at each site. More Read More
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Central to understanding krill population dynamics is knowledge of their population structure. To examine this we used length-frequency distributions from 142 weeks of sampling (n= 23996 krill) of 3 predator species breeding at South Georgia and 12 weeks of sampling (n = 10 252 krill) from scientific nets from the same area over the summers of 1991-1997. In comparing the 5 years with both Read More
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Variability in the reproductive performance of marine predators may be a result of physical forcing by large-scale oceanographic variability. Time lags, remoteness from the epicentre of a physical process and the simultaneous action of multiple physical processes often mean that it is difficult to link variability in predator performance with specific measurements of oceanographic variability Read More
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Antarctic fur seal, Arctocephalus gazella, pup growth rates were measured using CEMP Standard Methods (C2 - Procedure B) over four consecutive Austral summer season (1994/95-1997/98) at CEMP Site and SSSI N°32 Cape Shirreff, Livingston Island, South Shetlands. Every fortnight (15 days) 100 pups (50 of each sex) were weighed by cross-sectional sampling. Pup growth rates were determined from Read More
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Salp by-catch and krill discolouration ('green' krill) caused by active feeding on phytoplankton were analysed using logbook data from Japanese krill trawlers operating near the Antarctic Peninsula. Interannual and seasonal variability of the timing, duration and intensity of salp blooms and the presence of green krill were analysed. No relationship between salp density and the proportion of Read More
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The assessment of environmental processes controlling variability of Antarctic krill (Euphausia superba) is an important subject to clarify the Antarctic marine ecosystem. We have assessed variability of krill recruitment and stock density with hypothesised environmental factors. We demonstrated long-term relationship between Antarctic krill recruitment in the Antarctic Peninsula area and sea- Read More
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Interannual variability is a characteristic feature of the Southern Ocean ecosystem yet the relative roles of biological and physical processes in generating these fluctuations are unknown. There is now extensive evidence that there are years when there is a very low abundance of Antarctic krill (Euphausia superba) in the South Georgia area, and that the variation affects much of the ecosystem Read More
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Acoustic estimates of abundance of the Antarctic krill, Euphausia superba, at South Georgia are presented for periods within ten austral summers between 1981 and 1998. This time series includes some previously published estimates arising from cruises where determination of krill density was a primary objective, and estimates derived for the first time here from acoustic data collected as a Read More
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