Résultats de la recherche
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Using stationary acoustic platforms to assess precision and accuracy of acoustical krill surveys
Abstract: The current CCAMLR protocol specifies daytime acoustic sampling in order to avoid ... issues of diel changes in acoustic scattering strengths. However, due to logistic constraints, acoustic ... a regular basis deployed stationary platforms in the main area for commercial krill harvesting at ... the South Orkney Islands since 2014, and in this report some of these data have been analysed in order ...
Meeting Document : WG-EMM-2019/32 : Auteur(s): T. Klevjer, G. Skaret and B.A. Krafft
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The living planet index
Abstract: UNEP-WCMC is developing further an approach for measuring and communicating trends in ... biodiversity captured in the Living Planet Index. The Index is based on average trends in populations of ... several hundred vertebrate species from around the world, and UNEP is interested in including CCAMLR data ...
Meeting Document : WG-EMM-04/16 : Auteur(s): Secretariat
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Comparative studies on the biological and acoustical properties of krill aggregations (Euphausia superba Dana) samples during the XIII Italian Expedition to the Ross Sea (December 1997–January 1998)
Abstract: During the XIII Italian Expedition to the Ross Sea in late spring and early summer ... the Euphausia superba) and acoustical (differences in volume back-scattering strength of krill ... recordings during the hauls. The surveyed area extended from 71° to 76°' S in latitude and from 164° E ... to 177° W in longitude. The aim of the paper is: (1) to compare the species/length composition of ...
Meeting Document : WG-EMM-00/39 : Auteur(s): M. Azzali, J. Kalinoswki, G. Lanciani and I. Leonori (Italy)
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Fatty acid signature analysis from the milk of Antarctic fur seals and southern elephant seals from South Georgia: implications for diet determination
used in marine ecosystems in which diet determination by more direct methods is difficult and sometimes ... misleading. This study examined fatty acid profiles in milk from two species of pinniped from the Southern ... fur seals (Arctocephalus gazella) in 3 consecutive years, from 1991- 1993 (n=72) and from Southern ... elephant seals (Mirounga leonina) in 1988 (n=53) at South Georgia. Lipids were extracted and fatty acid ...
Meeting Document : WG-EMM-99/44 : Auteur(s): D.J. Brown, I.L. Boyd, G.C. Cripps and P.J. Butler (United Kingdom)
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Marine debris, entanglements and hydrocarbon soiling at Bird Island and King Edward Point, South Georgia, Signy Island, South Orkneys and Goudier Island, Antarctic Peninsula, 2010/11
Island. In total, 177 items of marine debris were found in association with seabird colonies at Bird ... at Bird Island and Signy Island during 2010/11 were below the long-term mean for beached debris in ... -term mean in summer and winter at Bird Island but slightly above the mean at Signy Island. At King ... Edward Point the number of entanglements was significantly higher than the single incidence reported in ...
Meeting Document : SC-CAMLR-XXX/BG/05 : Auteur(s): Delegation of the United Kingdom
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The Patagonian toothfish: biology, ecology and fishery
, biochemistry, parasite fauna and tagging indicate a high degree of isolation between populations in the Indian ... Ocean, South Georgia region and the Patagonian Shelf. Patagonian toothfish spawn in deep-water (circa ... age, when they begin a gradual migration into deeper water. As juveniles in shallow water, toothfish ... mineralised skeletons and a high fat content in muscle, which helps neutral buoyancy, but limits swimming ...
Meeting Document : WG-FSA-10/P05 : Auteur(s): M.A. Collins, P. Brickle, J. Brown and M. Belchier
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A distribution-free model of length-frequency distribution to inform fishery stratification for integrated assessments
significantly influence the LFD helps in evaluating how to account for important differences in availability and ... set of length quantiles L for a predetermined set of corresponding probabilities P (in this instance ... 0.05, 0.1 to 0.9 in 0.1 increments, and 0.95), constructed from individual length measurements of ... and sensitivity in detecting differences compared to modelling a single quantile such as the median ...
Meeting Document : WG-SAM-13/18 : Auteur(s): S. Candy, P. Ziegler and D. Welsford (Australia)
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Adélie penguin colony size predicts south polar skua abundance on Ross Island, Antarctica
Abstract: Top predators are useful ecological indicators of changes in marine prey stocks and ... other ecosystem drivers. In the Ross Sea region, most south polar skuas (Catharacta maccormicki) nest ... carrion. We estimated skua abundance at Adélie penguin colonies on Ross Island in two consecutive years ... areas of varying size within the three main Ross Island colonies. We considered skua populations in ice ...
Meeting Document : WG-EMM-14/55 : Auteur(s): D.J. Wilson, P.O’B. Lyver (New Zealand), A.L. Whitehead (Australia), T.C. Greene (New Zealand), K. Dugger (USA), B.J. Karl, J.R.F. Barringer, R. McGarry (New Zealand), A.M. Pollard and D.G. Ainley (USA)
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Long term movements and activity patterns of an Antarctic marine apex predator: the leopard seal
including one individual in two separate years. Whilst the sample size is small the results represent an ... advance in our limited knowledge of leopard seals. We show the longest periods of tracking of leopard ... island of South Georgia. It appears that these tracked animals migrate in a directed manner towards Bird ... , similar to those observed in other predators in the region including the krill fishery. Analysis of ...
Meeting Document : WG-EMM-18/P09 : Auteur(s): I.J. Staniland, N. Ratcliffe, P.N. Trathan and J. Forcada
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THE ASAM 2010 ASSESSMENT OF KRILL BIOMASS FOR AREA 48 FROM THE SCOTIA SEA CCAMLR 2000 SYNOPTIC SURVEY
Abstract: In June 2010 the CCAMLR ASAM working group examined the acoustic methodology applied to ... the acoustic protocol identified in ASAM 2009. The total biomass of krill in the Scotia Sea was ... estimated from acoustic and net data collected during the international multi-ship krill biomass in the ... Scotia Sea in 2000 to be 60.3 million metric tonnes. This report aims to document the parameters utilised ...
Meeting Document : WG-EMM-11/20 : Auteur(s): S. Fielding and J. Watkins (UK) and ASAM participants: A. Cossio, C. Reiss and G. Watters (USA), L. Calise and G. Skaret (Norway), Y. Takao (Japan), X. Zhao (People’s Republic of China), D. Agnew (UK) and D. Ramm and K. Reid (CCAMLR Secretariat)