Résultats de la recherche
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Change in environmental conditions of the Southern Ocean observed by satellites and data-assimilating models between 1981 and 2019
Abstract: We provide a summary of environmental change in the Southern Ocean over the period of ... movement north of the Subantarctic Front; (3) increasing chl-a and NPP in the Subantarctic Front and around ... the southern limit of the ACC except in the Ross Sea region; (4) decreasing chl-a and NPP in the Ross ... Sea sector and on the Antarctic continental shelf; (5) gradual loss of sea-ice in the Amundsen Sea and ...
Meeting Document : WG-EMM-2019/39 : Auteur(s): M. Pinkerton
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Report of the UK Groundfish Survey at South Georgia (CCAMLR Subarea 48.3) in January/February 2019
in 2017, but is comparable with the long term average. The highest catches were on the moraine banks ... of the two northern strata and at the western end of Shag Rocks, with one high catch recorded in the ... South West stratum. Clear regional differences in C. gunnari diet composition were observed. At Shag ... . superba as a prey species varied across the four regions at South Georgia, ranging from 10.48% IRI in the ...
Meeting Document : WG-FSA-2019/20 : Auteur(s): S. Gregory, P. Hollyman, T. Earl, A. Clement, J. Visagie, L. Featherstone and M. Belchier
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A REVIEW OF BIAS AND UNCERTAINTY IN ANTARCTIC PACK-ICE SEAL ABUNDANCE ESTIMATES
groups, including abundance, trends in abundance, habitat utilisation, foraging and growth, this review ... of pack-ice seals focuses primarily on abundance and to a lesser extent trends in abundance. The ... encountered in the pack-ice and fast-ice surrounding Antarctica (crabeater seal Lobodon carcinophaga, Ross ... than 50 years from when pack-ice seal surveys were first undertaken and reported in the 1950s to the ...
Meeting Document : CCAMLR-IWC-WS-08/06 : Auteur(s): Steinhage, D., Bengtson, J., Blix, A.S., Bester, M., Boveng, P., Laake, J., Cameron, M., Nordøy, E., Forcada, J., Stewart, B., Southwell, C., Trathan, P., Rogers, T., Plotz, J., Bornemann, H.
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Species variability and population structure of Euphausiacea in Admiralty Bay (King George Island; South Shetland Islands) during Antarctic summer
Abstract: The main component of zooplankton in Antarctic pelagic waters, apart from copepods or ... salps, are specimens representing euphausiids. In fjordic areas like Admiralty Bay, data concerning ... expedition to the H. Arctowski station in the Antarctic summer 2008-2009. Biological materials were collected ... in the central part of Admiralty Bay, in Ezcurra Inlet and in the smaller coves of the bay using the ...
Meeting Document : WG-EMM-14/60 : Auteur(s): A. Panasiuk-Chodnicka, J. Wawrzynek and M. Iwona Żmijewska (Poland)
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Updated status of Notothenia rossii, Gobionotothen gibberifrons and Notothenia coriiceps in inshore sites of the South Shetland Islands: results of a long-term monitoring program (1983–2016) at Potter Cove
Abstract: Trammel net surveys were continued in Potter Cove, South Shetland Islands, Antarctica ... , to achieve a 33-year record, 1983-2016, to monitor changes in the prevalence of three species of ... consistent with those achieved from the most recent offshore bottom trawl research cruises in 2007 and 2012 ... around the South Shetland Islands: 1) a continuous increase in the abundance of N. rossii; 2) further ...
Meeting Document : WG-FSA-16/02 : Auteur(s): E. Barrera-Oro, E. Marschoff and D. Ainley
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Report on a random stratified trawl survey to estimate distribution and abundance of Dissostichus eleginoides and Champsocephalus gunnari conducted in the Heard Island region (Division 58.5.2), May–June 2007
Abstract: Since the commencement of commercial fishing in Australian waters on the Heard Island ... plateau in 1997 an annual random stratified trawl survey (RSTS) has been conducted to assess the stocks of ... on the Heard Island Plateau. The survey had the same design as the 2006 RSTS survey in the number of ... stations chosen for sampling in each stratum. This paper describes the conduct of the survey on the FV ...
Meeting Document : WG-FSA-07/46 : Auteur(s): G.B. Nowara and T. Lamb (Australia)
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Killer whale Orcinus orca and sperm whale Physeter macrocephalus interactions with longline vessels in the Patagonian toothfish fishery at South Georgia, South Atlantic
Living Resources) observers between 2000 and 2002 at South Georgia (Subarea 48.3) in the Southeast ... deployed in depths of 300 to 2000m, concentrated along the 1000m contour. Sperm whales were the most ... abundant marine mammals observed in the vicinity of vessels when lines were being hauled, occurring during ... were not often sighted. Interactions with killer whales were most often observed in the day, mostly in ...
Meeting Document : WG-FSA-03/27 : Auteur(s): M.G. Purves (United Kingdom), D.J. Agnew (United Kingdom), E. Balguerías (Spain), C.A. Moreno (Chile) and B. Watkins (South Africa)
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On the possibility of practical utilisation of krill target strength TS in situ obtained on the basis of EK-500 measurements
Abstract: Comparative analysis of krill length distribution in the echosurvey area, obtained with ... obtained on the basis of the empiric model by Greene et al. (1991) using estimates of target strength in ... krill length estimation in echosurveys implemented in practice as target strength (TS) in situ ... measurement with EK-500 and calculation of TS talc. on the basis of krill length composition in catches ...
Meeting Document : WG-EMM-98/19 : Auteur(s): S.M. Kasatkina (Russia)
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DISTRIBUTION OF KRILL AT THRESHOLD DENSITIES SUITABLE FOR FISHING IN THE ATLANTIC SECTOR: ANALYSIS OF THE 2000 SYNOPTIC SURVEY DATA
shelf SSMUs in terms of the frequency of 1nm integration units with krill densities above and below a ... range of threshold values. 2. In general pelagic SSMUs had markedly lower frequencies of fishable ... . This was also true with other threshold values in the range 25 to 200 gm2 although the difference was ... smaller for higher thresholds. 4. The contrasting probability of encountering fishable concentrations in ...
Meeting Document : WG-EMM-08/16 : Auteur(s): S. Hill and D. Agnew (United Kingdom)
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Changes in the fish biomass around Elephant Island (Statistical Subarea 48.1) from 1976 to 1996
Abstract: Finfish stocks in the Antarctic Peninsula region (CCAMLR Statistical Subarea 48.1) have ... been exploited from 1978179 to 1988189 with most of the commercial harvesting taking place in the first ... two years of the fishery. Results of bottom trawl surveys conducted by Germany in the vicinity of ... Elephant Island in the 1980s showed that stocks of Champsocephalus gunnari, Notothenia rossii ...
Meeting Document : WG-FSA-97/27 : Auteur(s): Kock, K.-H.