Resultados de la búsqueda
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Updating the Antarctic krill biomass estimates for CCAMLR Subareas 48.1 to 48.4 using available data
, based on data from scientific nets and covering the years between 2000 and 2011. The annual biomass ... variation was significant (CV=73%) but no systematic change in krill biomass was evident during the period ... . The index also suggests that realised exploitation rates were below 0.5% (i.e. catch was <0.5% of ... biomass) and that the potential exploitation rates implied by the operational catch limit (the trigger ...
Meeting Document : WG-EMM-15/28 : Autor(es): S. Hill, A. Atkinson, C. Darby, S. Fielding (United Kingsom), B. Krafft, O.R. Godø, G. Skaret (Norway), P. Trathan, J. Watkins (United Kingdom)
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New Zealand’s exploratory fishery for toothfish within the SPRFMO Convention Area: update and future directions
Abstract: The 2-year programme of exploratory fishing provided for by SPRFMO CMM 4.14 has been ... successfully completed and new and important biological information has been collected on toothfish outside the ... CCAMLR convention area. The key findings are that only Antarctic toothfish, Dissostichus mawsoni, were ... surveys provide information on the life history of Antarctic toothfish that is consistent with the current ...
Meeting Document : SC-CAMLR-XXXVI/BG/18 : Autor(es): M. Cryer, A. Dunn and J. Fenaughty
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Model-based mapping of assemblages for ecology and conservation management: A case study of demersal fish on the Kerguelen Plateau
of Common Profile (RCP) to quantify and map the distribution of demersal fish assemblages in an ... ecologically significant region of the Southern Ocean to a) gain ecological and management insights and b ... ) evaluate the utility of the new method for ecoregionalisation. The RCP approach is a multi-species, model ... simultaneously groups sites with a similar composition of species and describes the patterns of variation in ...
Meeting Document : WS-SM-18/P02 : Autor(es): N.A. Hill, S.D. Foster, G. Duhamel, D. Welsford, P. Koubbi and C.R. Johnson
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Spatial and temporal operation of the Scotia Sea ecosystem: a review of large-scale links in a krill centred food web
Abstract: The Scotia Sea ecosystem is a major component of the circumpolar Southern Ocean system ... , where productivity and predator demand for prey are high. The eastward-flowing Antarctic Circumpolar ... Current (ACC) and waters from the Weddell–Scotia Confluence dominate the physics of the Scotia Sea ... , manifest by the changing irradiance and sea ice cover, which leads to shorter summers in the south. Summer ...
Meeting Document : WG-EMM-07/P8 : Autor(es): E.J. Murphy, J.L. Watkins, P.N. Trathan, K. Reid, M.P. Meredith, S.E. Thorpe, N.M. Johnston, A. Clarke, G.A. Tarling, M.A. Collins, J. Forcada, R.S. Shreeve, A. Atkinson, R. Korb, M.J. Whitehouse, P. Ward, P.G. Rodhouse, P. Enderlein, A.G. Hirst, A.R. Martin, S.L. Hill, I.J. Staniland, D.W. Pond, D.R. Briggs, N.J. Cunningham and A.H. Fleming (United Kingdom)
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Shags in Antarctica: their feeding behaviour and ecological role in the marine food web.
Abstract: Feeding behaviour, ecological role in the marine food web and population trend of the ... Antarctic Shag Phalacrocorax bransfieldensis and the South Georgia Shag P. georgianus in Antarctica are ... analysed. The diving depths and duration registered in these shags are the deepest and longest among all ... predominantly on demersal fish. In the Southern Scotia Arc and west Antarctic Peninsula, nototheniids, mainly ...
Meeting Document : WG-FSA-05/P5 : Autor(es): Casaux, R., Barrera-Oro, E.R.
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Spatial distribution of predator/prey interactions in the Scotia Sea: implications for measuring predator/fisheries overlap
Abstract: The measurement of spatial overlap between predators and fisheries exploiting a common ... prey source is dependent upon the measurement scale used and the use of inappropriate scales may ... provide misleading results. Previous assessments of the level of overlap between predators and fisheries ... for Antarctic krill Euphausia superba in the South Shetland Islands have used different measurement ...
Meeting Document : WG-EMM-02/14 : Autor(es): K. Reid, M. Sims, R.W. White and K.W. Gillon (United Kingdom)
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Reconciling theoretical versus empirical target strengths of krill; effects of phase variability on the distorted wave Born approximation
Abstract: A model was recently proposed to predict the target strengths (TS) of Antarctic krill ... ]. Based on the distorted wave Born approximation (DWBA), the model depends upon the coherent summation of ... broadside incidence (?? 90°), but large discrepancies were observed at other angles away from the main lobe ... . As the side-lobe measurements were both higher than the model predictions and above the noise floor ...
Meeting Document : WG-EMM-02/50 : Autor(es): D.A. Demer and S.G. Conti (USA)
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The fishery for Champsocephalus gunnari and its biology at Heard Island (Division 58.5.2)
Abstract: Commercial trawl fisheries in the modern era started within the Heard Island EEZ in ... 1997. This paper summarises the fishing activities to date and collates the information on the biology ... of the species gathered from the fishery and from a series of fishery-independent surveys conducted ... between 1990 and 2000. Icefish abundance varies widely between years and the fishery is dependent on ...
Meeting Document : WAMI-01/04 : Autor(es): R. Williams, E. van Wijk, A. Constable and T. Lamb (Australia)
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ON THE STUDY OF FECUNDITY AND EGGS SIZE OF ANTARCTIC TOOTHFISH DISSOSTICHUS MAWSONI NORMAN 1937
Abstract: The results of the microscopic analyses of the Antarctic toothfish (Dissostichus ... mawsoni) fecundity and eggs size, caught in December-March the Pacific and Indian Ocean area of the ... Antarctica are presented. We analyzed the main reproductive characteristics which determinate the individual ... fecundity of the Antarctic toothfish: individual absolute fecundity by the largest oocytes, share of largest ...
Meeting Document : WG-FSA-08/35 : Autor(es): S.V. Piyanova. A.F. Petrov and N.V. Kokorin (Russia)
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Changes in population size of large Procellariiformes breeding in the French sub-Antarctic islands: potential influence of southern fisheries and particularly long lining
Abstract: Studies carried out over the past three decades in the French austral territories ... indicate that these declines are mainly the result of increased adult mortality. This high rate of ... mortality has been suspected to be the result of mortality incurred in long-line fisheries. Satellite ... outside the breeding season these populations are in contact with long-line fisheries, mainly the pelagic ...
Meeting Document : WG-IMALF-94/11 : Autor(es): Henri Weimerskirch and Pierre Jouventin (France)