Résultats de la recherche
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Report on fishery and scientific activity of Ukraine in the Antarctic in 1993/94
in subarea 48.2 from 01.03.1994 to 10.04.1994 and from the middle of the second ten-day period of May ... to the middle of the first t en-day period of June. GENERAL PETROV worked from 21.04 to 17.05 in ... Abstract: In the season of 1993-1994 Ukrainian fishing fleet conducted fisheries in two areas of ... Antarctic waters of the World Ocean: in the Atlantic (subareas 48.2 and 48.3) and the Indian (zone of the ...
Meeting Document : SC-CAMLR-XIII/BG/12 : Auteur(s): Observer (Ukraine)
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Trends in bird and seal populations as indicators of a system shift in the Southern Ocean
components is poorly understood because of the difficulty of obtaining long-term data sets on marine ... organisms. The Southern Ocean plays a critical role on global climate and there is growing evidence of ... a time lag of 2–9 years with temperatures, the population size of most seabirds and seals monitored ... . These changes, together with the indications of a simultaneous decrease in secondary production in sub ...
Meeting Document : WG-EMM-03/53 : Auteur(s): H. Weimerskirch, P. Inchausti, C. Guinet and C. Barbraud (France)
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Pup production and distribution of breeding Antarctic fur seals (Arctocephalus gazella) at South Georgia
in the 1950s and 1960s. Increased population size has led to an expansion of the breeding range at ... Abstract: 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 ...
Meeting Document : WG-CEMP-92/39 : Auteur(s): I.L. Boyd (United Kingdom)
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Quantifying vessel performance in the CCAMLR tagging program: spatially and temporally controlled measures of tag-detection rates
temporally controlled measures of tag-detection rates Abstract / Description: A reliable commercial fish ... tagging program is critical to the successful management of a number of toothfish fisheries in Antarctica ... an integrated stock assessment. Previous attempts to assess the relative reliability of vessels in ... detecting tagged fish have been inconclusive due to low numbers of recaptures after controlling for spatial ... probability of recapture for both the case and the controls, irrespective of fish move- ment or tag loss ... -structured stock assessment model of Antarc- tic toothfish (Dissostichus mawsoni) to determine sustainable ... yields (Mormede et al., 2011a, 2011b; Mormede, 2011). In those analyses, the assumed values of ... mortality of tagged fish and the subse- quent detection rate of recaptured tagged fish are important input ...
Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 73–80 : Auteur(s): Mormede, S. and A. Dunn
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Physical oceanographic setting of the Siedlecki January 1987, South Shetland Island data set
Paper Title: Physical oceanographic setting of the Siedlecki January 1987, South Shetland Island ... data set Abstract / Description: In the vicinity of the northern tip of the Antarctic Peninsula, the ... water from the Pacific Ocean. A series of fronts form which are collectively referred to as the Weddell ... Scotia Sea water by a zone of varied width (10 to 100 km) of water which can best be considered as ... population (Marr, 1962). The Weddell Gyre is a large, wind-driven cyclonic gyre, with a transport of 70 to ... SC-CAMLR-VII/BG/19 PHYSICAL OCEANOGRAPHIC SETTING OF ... vicinity of the northern tip of the Antarctic Peninsula, the Bransfield Straits and South Shetland Islands ... of fronts form which are collectively referred to as the Weddell-Scotia Confluence. Within the ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 161-184 : Auteur(s): Gordon, A.L.
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Estimation of krill (Euphausia superba) mortality and production rate in the Antarctic Peninsula region
Paper Title: Estimation of krill (Euphausia superba) mortality and production rate in the ... data of an identical survey with RV Polarstern in 1987/88. Seasonal variation between summer and winter ... abundance/biomass data exceeded a factor of 1:35, while inter-annual variability between available surveys ... reached only a factor of 1:1.6. Krill mortality was calculated by linearized catch curve analysis and ... indicating a missing of a middle aged class (see below). 3.2 Biomass Krill biomass was mapped as g/m2 ... WG-KRILL-91/15 ESTIMATION OF KRILL (EUPHAUSIA SUPERBA ... January 1990. Results were compared with data of an identical survey with RV Polarstern in 1987/88 ... . Seasonal variation between summer and winter abundance/biomass data exceeded a factor of 1:35, while ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 159–176 : Auteur(s): Siegel, V.
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Factors affecting the incidental mortality of seabirds in the Dissostichus eleginoides fishery in the southwest Atlantic (Subarea 48.3, 1995 season)
Paper Title: Factors affecting the incidental mortality of seabirds in the Dissostichus ... analyses all incidental mortality of seabirds recorded on Argentinian and Chilean vessels fishing for ... possible to evaluate almost all of the incidental mortality of seabirds observed during the season. The ... total mortality recorded was 1 428 birds of which white-chimed petrels (Procellaria aequinoctialis ... THE INCIDENTAL MORTALITY OF SEABIRDS IN THE DISSOSTICHUS ELEGlNOlDES FISHERY IN THE SOUTHWEST ... , Argentina Abstract This paper analyses all incidental mortality of seabirds recorded on Argentinian and ... observers from each vessel. It was thus possible to evaluate almost all of the incidental mortality of ... seabirds observed during the season. The total mortality recorded was 1 428 birds of which white-chimed ...
Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 79–91 : Auteur(s): Moreno, C.A., P.S. Rubilar, E. Marschoff and L. Benzaquen
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A potential feedback approach to ecosystem-based management: Model Predictive Control of the Antarctic krill fishery
Control of the Antarctic krill fishery Abstract / Description: CCAMLR aims to develop a feedback approach ... to aid ecosystem-based management (EBM) of Antarctic krill fisheries. It is important to assess ... and uncertain conditions typical of Antarctic marine ecosystems. This study used Model Predictive ... spatially resolved annual catch limits in response to estimates of the state of the system. It suggests that ... Sivan, 1972). This leads to the following defi- nition of the optimal control problem: { }0 1 2 20 2 ... observability (Kwakernaak and Sivan, 1972) of plausible models of ecosystem dynamics might help to prioritise ... a potential catch limit equivalent to 7% of current global fisheries landings (Hill, 2013a ... key goals of ecosystem-based management (EBM) (Grant et al., 2013). Feedback management must ...
Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 119–137 : Auteur(s): Hill, S.L. and M. Cannon
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Temporal variation in Antarctic sea-ice: analysis of a long-term fast-ice record from the South Orkney Islands
Abstract: Detection of climate-induced change in marine ecosystems requires a knowledge of the ... underlying variability of the environment. This paper uses a range of datasets to investigate the interannual ... variability in Southern Ocean sea-ice dynamics. We present the first analysis of a series of fast-ice duration ... indicate that there has been a long term decline in the duration of sea-ice at the South Orkney Islands in ...
Meeting Document : WG-EMM-95/80 : Auteur(s): Symon, C., Murphy, E.J., Priddle, J., Clarke, A.
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Significant conservation benefits obtained from the use of a new fishing gear in the Chilean Patagonian toothfish fishery
Paper Title: Significant conservation benefits obtained from the use of a new fishing gear in the ... practically eliminated depredation of fish by killer whales (Orcinus orca) and sperm whales (Physeter ... macrocephalus). The performance of this fishing technique with regard to seabird mortality and depredation by ... the implementation of the modification. The number of seabirds killed in 2002 was 1 542 compared to ... of this on incidental seabird mortality and fish loss to marine mammal depredation. The results of ... ) sightings of sperm and killer whales around the vessels; and (iii) loss of fish from the line to sperm and ... Significant conServation benefitS obtained from the uSe of a neW fiShing gear in the chiLean Patagonian ... net sleeve that is placed on secondary vertical lines, has practically eliminated depredation of fish ...
Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 79–91 : Auteur(s): Moreno, C.A., R. Castro, L.J. Mújica and P. Reyes