Résultats de la recherche

1. Circumpolar connections between Antarctic krill (Euphausia superba Dana) populations: Investigating the roles of ocean and sea ice transport

   critical food source and shelter, particularly in the early life stages. Advective modelling of transport ... pathways of krill have until now been on regional scales and have not taken explicit account of sea ice ... potential roles of the ocean and sea ice in maintaining the observed circumpolar krill distribution. We show ... dispersal depending upon location. Within the major krill region of the Scotia Sea, the effect of temporal ...

   Meeting Document : WG-EMM-07/P10 : Auteur(s): S.E. Thorpe, E.J. Murphy and J.L. Watkins (United Kingdom)

2. An updated descriptive analysis of the toothfish (Dissostichus spp.) tagging program in Subareas 88.1 and 88.2 for 2006/07

   and 88.2 since 2001 are updated. The paper provides a preliminary update of the tag-release and tag ... described in this paper for the first time. Overall, a reported total of 12 177 Antarctic toothfish have ... Abstract:  Descriptive analyses of the toothfish tagging programme carried out in Subareas 88.1 ... -recapture data that were presented at the October 2006 meeting of WG-FSA by including data from New Zealand ...

   Meeting Document : WG-SAM-07/5 : Auteur(s): A. Dunn, S.M. Hanchet and S.L. Ballara (New Zealand)

3. Developing a carbon-budget trophic model of the Ross Sea, Antarctica: work in progress

   Abstract:  We report on the development of a carbon-budget trophic-model of the Ross Sea. We ... provisionally defined the food web of the Ross Sea as having the following functional compartments: birds, seals ... heterotrophs, water column zooplankton (ciliates, heterotrophic flagellates, mesozooplankton), three groups of ... column, ice, and benthic). The simple trophic model requires well over a hundred parameters, each of ...

   Meeting Document : WG-EMM-05/18 : Auteur(s): M. Pinkerton, S. Hanchet, J. Bradford-Grieve and P. Wilson (New Zealand)

4. Age validation of Patagonian toothfish (Dissostichus eleginoides) from Heard and Macquarie Islands

   counting presumed growth increments on the sectioned face of sagittal otoliths. While there is a general ... . eleginoides in the Heard Island and Macquarie Islands fisheries has included injection of most fish with ... Strontium Chloride (SrCl2) on release. One hundred and forty two of these strontium marked fish were ... selected for analysis. Strontium (Sr) marks were detected in 139 of the 142 otoliths examined. Using the ...

   Meeting Document : WG-FSA-05/60 : Auteur(s): K. Krusic-Golub and R. Williams (Australia)

5. Further development and progress towards evaluation of an Antarctic toothfish (Dissostichus mawsoni) stock model for the Ross Sea

   Abstract:  This report outlines the development of a Bayesian sex and age structured population ... model for the assessment of Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea (Subareas 88.1 ... and 88.2), and initial progress towards evaluation of spatially explicit models. Three model scenarios ... either two or three discrete areas, with migrations of fish between areas. The 2-area model appeared to ...

   Meeting Document : WG-FSA-SAM-05/12 : Auteur(s): A. Dunn, D.J. Gilbert and S.M. Hanchet (New Zealand)

6. Population, breeding, diet and conservation of Crozet shag Phalacrocorax [atriceps] melanogenis at Marion Island, 1994/95 to 2002/03

   Abstract:  The number of Crozet shags or cormorants Phalacrocorax [atriceps] melanogenis breeding ... mean number of pairs at colonies also decreased and was significantly related to the overall number of ... birds breeding in any given season. The decreases coincided with a period of warming and reduced ... precipitation at Marion Island and with a decrease in the number of gentoo penguins Pygoscelis papua breeding ...

   Meeting Document : WG-EMM-03/17 : Auteur(s): R.J.M. Crawford, J. Cooper, B.M. Dyer, A.C. Wolfaardt, D. Tshingana, K. Spencer, S.L. Petersen, J.L. Nel, D.G. Keith, C.L. Holness, B. Hanise, M.D. Greyling and M. du Toit (South Africa)

7. Preliminary analyses in support of the CEMP Review Workshop: power analyses

   Abstract:  A series of power (sensitivity) analyses of CEMP indices was made using the DOS-based ... change over the range –10% to +10% of a mean survey value. Each run of MONITOR involved the calculation ... of power for 3 survey scenarios and 3 alpha levels (0.05, 0.10 and 0.20). The 3 surveys scenarios ... were chosen to represent time series data from annual surveys conducted annually over periods of 5, 10 ...

   Meeting Document : WG-EMM-03/26 : Auteur(s): Secretariat

8. Populations of surface-nesting seabirds at Marion Island, 1994/95 to 2002/03

   Abstract:  During the 1990s and early 2000s, populations of surface-nesting seabirds at Marion ... Island showed different trends, but for the majority of species numbers decreased. Reduced numbers of ... attributed to an altered availability of food. Decreases in numbers of dark-mantled sooty albatrosses ... and possibly northern giant petrels M. halli may have resulted from mortality of birds in longline ...

   Meeting Document : WG-EMM-03/8 : Auteur(s): R.J.M. Crawford, J. Cooper, B.M. Dyer, M.D. Greyling, N.T.W. Klages, P.G. Ryan, S.L. Petersen, L.G. Underhill, L. Upfold, W. Wilkinson, M.S. de Villiers, S. du Plessis, M. du Toit, T.M. Leshoro, A.B. Makhado, M.S. Mason, D. Merkle, D. Tshingana, V.L. Ward and P.A. Whittington (South Africa)

9. Ecological games in space and time: the distribution and abundance of Antarctic krill and penguins

   Abstract:  The distribution and abundance of organisms are affected by behaviors, such as habitat ... , environmental conditions, and the biology of the species involved. Although extensive theoretical work has ... explored predator–prey dynamics, these models have not considered the impact of behavioral plasticity and ... of a spatial, dynamic ecological game between predators and prey using a life-history perspective. As ...

   Meeting Document : WG-EMM-03/33 : Auteur(s): S.H. Alonzo, P.V. Switzer and M. Mangel (USA)

10. Can trace element signatures in the otoliths of Dissostichus eleginoides record capture size?

    Abstract:  The elemental structure of growth increments in the otoliths of fish reflects the ... composition of water passing across the gills: as a result, elemental signatures can potentially be used to ... reconstruct the environmental history experienced by fish. To test whether the otolith elemental signatures of ... from the outer edges (which are laid down during the interval leading to capture) of otoliths taken ...

    Meeting Document : WG-FSA-03/88 : Auteur(s): J.R. Ashford and C.M. Jones (USA)

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