Résultats de la recherche
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A critical re-examination of the evidence for a possible dependence of Weddell seals (Leptonychotes weddellii) on Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea, Antarctica
-energy food resource for Weddell seals that possibly cannot be adequately replaced by other prey, in ... antarcticum) in Weddell seal diets should be re-examined given the known biases of methods used to derive diet ... resource, smaller size classes are unlikely to be adequate to meet the estimated energy requirements of ...
Meeting Document : WG-EMM-13/28 : Auteur(s): R. Eisert, M.H. Pinkerton (New Zealand), S.D. Newsome and O.T. Oftedal (USA)
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A characterisation of the toothfish fishery in Subareas 88.1 and 88.2 from 1997–98 to 2012–13
be indexing abundance. Length frequency distributions of Antarctic toothfish in the Ross Sea fishery ... have continued to be reasonably stable in the North and to have a strong mode of smaller fish on the ... but have declined since 2005. The trend on the Slope appears to be confounded by the trend of some ...
Meeting Document : WG-FSA-13/48 : Auteur(s): S. Hanchet, S. Mormede and A. Dunn (New Zealand)
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A spatially explicit population dynamics operating model for Antarctic toothfish in the habitable depths of the Ross Sea region
depths for toothfish. Further data collection would be useful to improve the parameterisation of the ... to date. We propose that the modelling platform presented here can be used to test the likelihood and ... movement scenario it can also be used to examine the likely effects on the toothfish stock assessment of ...
Meeting Document : WG-FSA-13/53 : Auteur(s): S. Mormede, A. Dunn, S. Parker and S. Hanchet (New Zealand)
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Revised proposal to continue the time series of research surveys to monitor abundance of Antarctic toothfish in the southern Ross Sea, 2016 and 2017
methods will remain the same as in previous years, and the number of sets will be retained at 45 sets for ... the 2016 survey, and trends in the time series, will be presented to WG-FSA for review in 2016 and ... that a full review be completed and presented to WG-EMM, WG-SAM and WG-FSA in 2017. Author(s): S.M ...
Meeting Document : WG-FSA-15/34 : Auteur(s): S.M. Hanchet, S.J. Parker, S. Mormede and R.J.C. Currey (New Zealand)
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Proposal for a skate tagging program in the Ross Sea region to estimate the local biomass trend for starry skates (Amblyraja georgiana)
survival assumed), would be about 0.6% of the Chapman estimate of biomass estimated from the tag release ... and recapture data. This is less than half of the gamma for this species, which we estimated to be ... hence we recommend that a 2-year skate tagging programme in the Ross Sea region be used to provide ...
Meeting Document : WG-FSA-18/38 Rev. 1 : Auteur(s): S. Parker and M. Francis
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Management and uncertainty: the example of South Georgia
uncertainty is unlikely to be avoided even though further research should reduce its degree. It seems useful ... Georgia, but the principles examined may be relevant to other management matters. File: 18- Gulland.pdf ... often made with some degree of uncertainty in scientific advice. Such uncertainty is unlikely to be ... rossii around South Georgia, but the principles examined may be relevant to other management matters ... , weaker, measure would fail to rebuild the stocks, then it should be much easier to agree to a closure ... . Such certainty is unlikely ever to be achieved, even though further research should reduce the degree ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 341-353 : Auteur(s): Gulland, J.A.
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Detection and quantitative estimation of krill concentrations by hydroacoustic instruments
in areas surveyed. The task of detecting surface concentrations of krill can be solved with the help ... theoretical calculations, the range of detection of individual specimens can be considerably increased at the ... detecting surface concentrations of krill can be solved with the help of towed acoustic antennae. The ... calculations, the range of detection of individual specimens can be considerably increased at the expense of ... small areas, dispersed concentrations in large areas, or be absent. Depending on the oceanographic ... large and small concentrations, or be dispersed. The size of aggregations can vary from a few to ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 123-139 : Auteur(s): Yudanov, K.I.
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Differentiation of independent populations of Antarctic krill
present, at least six stable cyclonic water circulations can be found and at least two or three of them ... may be habitats of independent krill sub-populations. A proposal is given for future studies into ... least six stable cyclonic water circulations can be found and at least two or three of them may be ... vital importance, because in areas where the fishery is intensive, krill may be threatened by ... overfishing while in other areas the stocks may be undere~ploited. The problem becomes important because of ... problems can only be solved satisfactorily if the population structure of the species is studied ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 275-281 : Auteur(s): USSR
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Ecosystem approach
and reporting should be developed to provide coherence and compatibility of research, monitoring and ... – advanced steps. 3.2.1.2 Explicit mechanisms, agreements and reporting should be developed with relevant ... CCAMLR SC participate in the meetings of both groups. 3.2.1.3 An explicit and active process should be ... coherent approach to ecosystem monitoring and research should be developed and adopted. Other ...
Page : Site Section: The Organisation
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A functional division of Electrona carlsbergi (Tåning, 1932) area of habitat in relation to the latitudinal zonation of the Southern Ocean
characteristics of the species, it should be noted that during our survey the change in maturation of male and ... female gonads was found to be related to the latitude of a place where the specimens were caught. This ... gradually decreases. Thus, the central part of the SAZ may be considered the main distribution area of ... fifth stage gonad maturity and, as such, may be seen as a zone of distribution of adults capable of ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 369–395 : Auteur(s): Zemsky, A.V. and S.A. Zozulya