Résultats de la recherche
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Environmental response of upper trophic level predators reveals a system change in an Antarctic marine ecosystem
Abstract: In the Antarctic Peninsula region current, long-term changes in the physical ... Georgia. Indices of population size and reproductive performance showed declines in all species and an ... increase in the frequency of years of low reproductive output. Changes in the population structure of krill ... largest size class was sufficient to support predator demand in the 1980's but not in the 1990's ...
Meeting Document : WG-EMM-01/21 : Auteur(s): K. Reid and J.P. Croxall (United Kingdom)
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LIFE HISTORY BUFFERING IN ANTARCTIC MAMMALS AND BIRDS AGAINST CHANGING PATTERNS OF CLIMATE AND ENVIRONMENTAL VARIATION
interannual variation in fitness. These species maximise fitness by keeping a low inter-annual variance in the ... survival of adults and in their propensity to breed annually, which are the vital rates that influence most ... the variability in population growth rate (λ). All these species have been able to buffer these rates ... against the effects of recent climate-driven habitat changes except for Antarctic fur seals, in the ...
Meeting Document : WG-EMM-08/P05 : Auteur(s): J. Forcada, P.N. Trathan and E.J. Murphy
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Factors influencing Antarctic krill distribution in the South Shetlands
Abstract: The influences of biological and physical factors in the environment upon krill ... (Euphausia superba) distribution were studies in the area north of South Shetland Islands during 1990/91 ... austral summer. Krill showed a distinct offshore-inshore heterogeneities in abundance and maturity stage ... in mid-summer the abundance was low in the oceanic zone (8.5 g/m2), while higher in the slope frontal ...
Meeting Document : WG-KRILL-93/38 : Auteur(s): T. Ichii, H. Ishii and M. Naganobu (Japan)
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Report of biological observations carried out on board the krill fishing vessel More Sodruzhestva in April to August 1991
fishing vessel More Sodruzhestva in April to August 1991 in Subareas 48.2 and 48.3. The program included ... channichthyids. In general, krill density in Subarea 48.2 was twice as high as that in Subarea 48.3. Catch-per ... dominant in catches taken in April/May in the north-west of Subarea 48.2. Krill of modal sizes 31 to 32 mm ... and 35 to 36 mm made up the bulk of catches in the south-east of the subarea. No by-catch of juvenile ...
Meeting Document : WG-KRILL-92/06 : Auteur(s): V.I. Latogursky (Russia)
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Background information to support development of a feedback management strategy for the krill fishery in Subarea 48.1
information needed to support development of a feedback management strategy for the krill fishery in Subarea ... 48.1. In this compilation, we provide support for combining SSMUs into groups of SSMUS (gSSMUs) to form ... Subarea 48.1 will both facilitate and expedite the allocation of a catch limit in the subarea without ... review the logic for these gSSMUs and then use the gSSMU concept in many of the vignettes that follow. In ...
Meeting Document : WG-EMM-16/45 : Auteur(s): Antarctic Ecosystem Research Division, Southwest Fisheries Science Center and NOAA Fisheries
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Revised research plan for the 2016/17 toothfish fishery in Division 58.4.4b by Japan and France
Abstract: Japan and France have revised the next season’s (2016/17) research plan in research ... during WG-SAM meeting in 2016. We have used extracted data provided by CCAMLR Secretariat in this late ... August for the current analysis, but not used the cleaning data provided by them in this early September ... due to tight schedule for the submission. The estimated median stock size in block 58.4.4b_1 and ...
Meeting Document : WG-FSA-16/33 Rev. 1 : Auteur(s): Delegations of Japan and France
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Monitoring Antarctic toothfish (D. mawsoni) recruitment in the southern Ross Sea
Abstract: Knowledge of recruitment dynamics, and in particular trends in recruitment and ... survey monitoring the recruitment of Antarctic toothfish (Dissotichus mawsoni) in the southern Ross Sea ... was started in 2012. The first year established the feasibility of carrying out a random stratified ... standardised gear in a standardised manner. It also established the appropriate depths and stratum boundaries ...
Meeting Document : WG-FSA-17/57 : Auteur(s): S.M. Hanchet, S. Mormede, S. Parker, K. Large, A. Dunn and B. Sharp
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Are penguins and seals in competition for Antarctic krill at South Georgia?
Abstract: The Antarctic fur seal and macaroni penguin are sympatric top predators that occur in ... consumers of Antarctic krill. In recent years the population of fur seals has increased whereas that of ... and are restricted in their foraging range at least while provisioning their offspring. In this study ... we test the hypothesis that the expanded fur seal population at South Georgia may have resulted in ...
Meeting Document : WG-EMM-01/22 : Auteur(s): K.E. Barlow, I.L. Boyd, J.P. Croxall, I.J. Staniland, K. Reid and A.S. Brierley (United Kingdom)
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AN ASSESSMENT OF ARTIFICIAL BAIT (NORBAIT™) AS A MEANS OF REDUCING THE INCIDENTAL CATCH OF MACROURUS AND OTHER BYCATCH SPECIES IN HIGH LATITUDE TOOTHFISH FISHERIES
(rattails) and other bycatch species in the toothfish autoline longline fishery. A company vessel carried ... out some initial experimental work in the western Ross Sea (CCAMLR Statistical Subarea 88.1) in 2007 ... Aspiring operating in the waters of South Georgia and the South Sandwich Islands (CCAMLR Statistical ... were set in both Subareas; a total of 137,000 experimental hooks. The evaluation was based on ...
Meeting Document : WG-FSA-08/52 : Auteur(s): J.M. Fenaughty (New Zealand)
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Has krill fishing the potential to adversely affect recruitment in Antarctic notothenioid fishes?
Abstract: A few years after krill (Euphausia superba) fishing had started in 1972/73, it became ... by-catch in fisheries targeting krill. The species composition of fish by-catch in krill fisheries is ... well-known from Polish investigations in the late 1970s and the 1980s and from Japanese, Ukrainian, and ... Russian investigations in the 1990s, 2000s and 2010s. However, only a few investigations in the 1990s and ...
Meeting Document : WG-FSA-14/66 : Auteur(s): K.-H. Kock (Germany) and C.D. Jones (USA)