Résultats de la recherche
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Defining predator foraging ranges, illustrated using Adélie penguin foraging tracks from Mawson coast
addressed in answering that question. The proposed method for defining foraging ranges is based on an ... effort and this is used to delineate a feeding ground for Adélie penguins on the Mawson coast in eastern ... Antarctica. This method builds on existing methods but incorporates tools for pooling information across ... likely to be foraged by predators from one year to the next, i.e. what is a predator’s feeding range ...
Meeting Document : WG-EMM-02/41 : Auteur(s): I.R. Ball, A.J. Constable, J. Clarke and L. Emmerson (Australia)
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Krill catch distribution in relation to predator colonies 1987 to 1992
is similar to that seen for other years, with 70% of the total catch from Subarea 48.1 being taken ... , calculated from CCAMLR fine-scale data, is shown for Subareas 48.1 and 48.2. The pattern of catches in 1992 ... -distance’). Although data reporting was not complete for Subarea 48.2 in 1992, it was estimated that 38% of ... the total exploitation of krill in these two subareas respectively. Author(s): Secretariat Title ...
Meeting Document : WG-KRILL-93/10 : Auteur(s): Secretariat
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ECOLOGICAL REPERCUSSIONS OF HISTORICAL FISH EXTRACTION FROM THE SOUTHERN OCEAN
stocks were on average reduced to <50%, and finally (mid-1980s) to <20%, of original size. Despite ... strong year classes, as is true of such fish elsewhere. A climate regime, the Southern Annular Mode, once ... oscillated between two states, but has remained in its “positive mode” since the time of the fish extraction ... South Shetland islands, where fishing was concentrated — declined simultaneously during the two periods ...
Meeting Document : WG-EMM-08/P07 : Auteur(s): D. Ainley and L. Blight
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The spawning dynamics of Patagonian toothfish in the Australian EEZ at Heard Island and the McDonald Islands and their importance to spawning activity across the Kerguelen Plateau
‘mature’, offset by two years to account for the duration of the maturation process, provided more ... available for 12 563 individuals. The histology of male and female gonads was also analysed from specimens ... animals, and that even large mature fish may not spawn every year. As a result, the conventional method of ... realistic estimates. The revised ogives were shown to have a significant impact on the estimates of stock ...
Meeting Document : WG-FSA-12/P08 : Auteur(s): D.C. Welsford, J. McIvor, S.G. Candy and G.B. Nowara
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Skate tagging in the Heard Island and McDonald Island (Division 58.5.2) toothfish fishery up to 2013
. Growth increments for tagged and recaptured B. eatonii indicated growth of ~20mm/year for both sexes ... liberty of nearly eight years for one B. irrasa. Range of movement in depth was between-266 m and 280 m ... recapture rate of less than one percent. The average distance between release and recapture for each of the ... from release to recapture, with B. irrasa tending to move in depth more than the other two species ...
Meeting Document : WG-FSA-13/22 : Auteur(s): G.B. Nowara, T.D. Lamb and D.C. Welsford (Australia)
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Quantifying habitat use in satellite-tracked pelagic seabirds: application of kernel estimation to albatross locations
two species covers an estimated 440,000 and 640,000 km2 respectively, with very substantial overlap ... , congeneric species are very distinct. Based on location density categories accounting for 50 % of locations ... . In contrast, kernel estimation reveals that the main foraging areas of these two sympatric ...
Meeting Document : WG-FSA-99/19 : Auteur(s): A.G. Wood (United Kingdom), B. Naef-Daenzer (Switzerland), P.A. Prince and J.P. Croxall (United Kingdom)
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Updated description of Patagonian toothfish (Dissostichus eleginoides) tagging and ageing programs in Division 58.5.2, 1997–2015
an additional 2559 estimates of age, for fish captured during the 2014 and 2015 Random Stratified ... revised growth function for inclusion in the 2015 revised stock assessment. Author(s): D.C. Welsford, B ... , considerably adding to information on the structure of the population. The ageing program at AAD has produced ... the 2009/10-2013/14 seasons. These samples have detected fish as old as 51 years, increasing the ...
Meeting Document : WG-FSA-15/55 : Auteur(s): D.C. Welsford, B. Farmer, T.D. Lamb, C. Péron, E. Woodcock and P.E. Ziegler (Australia)
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Non-native Species in the Antarctic: Report of a Workshop
the ninth meeting of the Committee for Environmental Protection (CEP). CCAMLR’s Article II requires ... south of 60° South, including, for example, male and female specimens of the North Atlantic Spider crab ... species have been discovered on the sub-Antarctic islands and several non-native species have been found ... activity, as well as a changing, more benign climate (particularly on the Antarctic Peninsula) mean that ...
Meeting Document : SC-CAMLR-XXV/BG/21 : Auteur(s): Delegation of New Zealand
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THE RESEARCH PROJECT TO DIGITIZE HISTORICAL SOVIET KRILL FISHING EXPEDITION DATA
exclusive set of observations for investigation of the environment and the impact of climate change on krill ... collect data and samples and to create an estimation of the commercial exploitation of the Antarctic krill ... stock. The data is currently recorded in the paper forms as expedition logbooks and represent an ... and distribution data in Convention areas in electronic format for scientists and CCAMLR consideration ...
Meeting Document : WG-EMM-09/30 : Auteur(s): L. Pshenichnov and G. Milinevsky (Ukraine)
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Fishing equipment, marine debris and hydrocarbon soiling associated with seabirds at Bird Island, South Georgia, 2004/05
has decreased significantly over the past two seasons. Entanglements continue to be observed, hooks ... the most number of marine debris, though again total quantity is significantly down on previous years ... such annual report. As in previous years, more items of fishing gear (mostly longlining gear) were ...
Meeting Document : SC-CAMLR-XXIV/BG/14 : Auteur(s): Delegation of the United Kingdom