Résultats de la recherche
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Quantifying vessel performance in the CCAMLR tagging program: spatially and temporally controlled measures of relative mortality and tag-detection rates
can derive meaningful indices of relative performance of groups of fishing effort (e.g. vessel, trip ... , etc). We developed indices of (i) the mortality (or loss of all tags) of released fish and (ii) the ... CCAMLR of a number of toothfish fisheries in Antarctica, but the evaluation of tagging performance has ... been thus far inconclusive because the confounding effect of factors such as time and location of ...
Meeting Document : WG-FSA-12/47 Rev. 1 : Auteur(s): S. Mormede and A. Dunn (New Zealand)
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Infectious diseases of Antarctic penguins: current status and future threats
alterations due to climate change: the Western Antarctic Peninsula, the Ross Sea, and coastal regions of East ... Sea, and coastal regions of East Antarctica. We propose possible steps towards the goal of ... System, means that our understanding is still patchy. A feather loss condition of unknown etiology ... Antarctica. From previous reports we know that penguin species are highly susceptible to a number of ...
Meeting Document : WG-EMM-14/53 : Auteur(s): W.W. Grimaldi, P.J. Seddon, P.O.B. Lyver, S. Nakagawa and D.M. Tompkins (New Zealand)
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Tooth growth in male Antarctic fur seals (Arctocephalus gazella) from South Georgia: an indicator of long-term growth history
died of natural causes at Bird Island. South Georgia, was quantified from measurements of annual layers ... provided an indication of body growth, Tooth growth rate was lowest in seals which died early (age 4 years ... Abstract: Growth of upper canine teeth of male Antarctic fur seals (Arctocephalus gazella) which ... in longitudinal sections of teeth. Mean age at death was 7∙69 ± 0∙07 years and this showed a small ...
Meeting Document : WG-CEMP-93/11 : Auteur(s): I.L. Boyd and J.P. Roberts (United Kingdom)
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COLLAPSE OF SOUTH AFRICA’S PENGUINS IN THE EARLY 21ST CENTURY
anchovy. In this province, there was a south-east displacement of prey around 2000, which led to a ... from about 56 000 pairs in 2001 to some 21 000 pairs in 2009, a loss of 35 000 pairs (>60%) in eight ... Abstract: The number of African penguins Spheniscus demersus breeding in South Africa collapsed ... classification of the species as Endangered. In South Africa, penguins breed in two regions, the Western Capeand ...
Meeting Document : WG-EMM-11/P8 : Auteur(s): R.J.M. Crawford, R. Altwegg, B.J. Barham, P.J. Barham, J.M. Durant, B.M. Dyer, D. Geldenhuys, A.B. Makhado, L. Pichegru, P.G. Ryan, L.G. Underhill, L. Upfold, J. Visagie, L.J. Waller and P.A. Whittington
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Relative abundance of large whales around South Georgia
mother-calf pair was observed off the Shag Rocks in February 1997. Extirpation of animals from this ... Abstract: To assess large whale stocks following the cessation of land-based South Georgia ... Island (NW of South Georgia) between 1979 and 1998, and mariner sightings between 1992 and 1997. All ... particular feeding ground is the most likely reason for ongoing low numbers of all species. Other factors may ...
Meeting Document : WG-EMM-99/34 : Auteur(s): M.J. Moore (USA), S.D. Berrow (UK), B.A. Jensen (USA), P. Carr (UK), R. Sears (Canada) and V.J. Rowntree, R. Payne and P.K. Hamilton (USA)
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By-catch of rays in the 2002/03 toothfish fishery around South Georgia
the number of rays that were likely to have died as a result of being caught on longlines using a ... survival and conservation of rays; • It was the first in which very good quality information was available ... from all observers’ tally periods on the catch rates of rays cut off the line; • In 2003 the UK, with ... the cooperation of Chile and one fishing company, undertook an experiment to determine the ...
Meeting Document : WG-FSA-03/58 : Auteur(s): D.J. Agnew, J. Pearce and M. Endicott (United Kingdom)
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MULTIPLE TIME SCALES OF VARIABILITY IN THE KRILL POPULATION AT SOUTH GEORGIA
conducted in the early, middle and late period of the summers of 2001 to 2005, together with krill ... abundance was highest during the middle of the summer in 3 years and in the late period in 2 years; in the ... Abstract: The South Georgia region supports a high biomass of krill that is the subject to high ... inter-annual variability. The lack of a self-sustaining krill population at South Georgia means that ...
Meeting Document : WG-EMM-08/48 : Auteur(s): K. Reid, J. Watkins, E. Murphy, P. Trathan, S. Fielding and P. Enderlein (United Kingdom)
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ANTARCTIC FUR SEAL PUP PRODUCTION AND POPULATION TRENDS IN THE SOUTH SHETLAND ISLANDS WITH SPECIAL REFERENCE TO SOURCES OF ERROR IN PUP PRODUCTION ESTIMATES
seal predation was estimated from the rate of mother-pup failed pairs after pups begin entering the ... Abstract: This paper reports the results of a ground survey of fur seal colonies from in the ... South Shetland Islands in 2007/08. Multiple counts of pups at each colony were conducted to establish ... census in 2001/02 (10,057 ±142 pups born). Dead pups accounted for 1.64% of the total. A comparison with ...
Meeting Document : WG-EMM-PSW-08/14 : Auteur(s): M.E. Goebel (USA), D.E. Torres C. (Chile), A. Miller, J. Santora, D. Costa (USA) and P. Diaz (Chile)
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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)