Resultados de la búsqueda
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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 : Autor(es): K. Krusic-Golub and R. Williams (Australia)
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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 : Autor(es): A. Dunn, D.J. Gilbert and S.M. Hanchet (New Zealand)
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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 : Autor(es): 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)
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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 : Autor(es): Secretariat
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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 : Autor(es): 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)
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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 : Autor(es): S.H. Alonzo, P.V. Switzer and M. Mangel (USA)
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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 : Autor(es): J.R. Ashford and C.M. Jones (USA)
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Estimates of bird by-catch by IUU vessels in Subarea 48.3, 1998–2001
Abstract: Estimates of bird catches by IUU fishing made using the new method presented by Agnew ... and Kirkwood last year (WG-FSA-02/4 & 5) are updated to take account of the comments of the ... working group. Last year we suggested that the Isabel data from 1997 were rather atypical of bird catch ... by other vessels in 1997. Including the Isabel data and weighting the bootstrap estimates of bird ...
Meeting Document : WG-FSA-03/56 : Autor(es): D.J. Agnew (United Kingdom)
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Do fish prey size affect the foraging patterns and breeding output of the Antarctic shag Phalacrocorax bransfieldensis?
Abstract: Concurrent information on diet composition, foraging patterns and breeding output of ... , followed by octopods and gastropods. Between colonies there were marked differences in the size of the fish ... number of specimens of the smallest fish species, Harpagifer antarcticus, consumed at that colony ... . Differences in the composition of the diet might be related to different foraging areas used by the shags ...
Meeting Document : WG-EMM-02/4 : Autor(es): R. Casaux and A. Baroni (Argentina)
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Report of the WG-FSA Intersessional Subgroup on Sampling Catches from Longlines
; 2) the allocation of observer effort within longline haul and between hauls; and 3) the allocation ... of observer effort directed toward fishery target species versus ecological interactions. Both ... activity by sampling every day of hauling. Both methods essentially follow a multi-stage cluster sampling ... fish/day, to sampling a set length of each line or number of hours of each day. The principal advantage ...
Meeting Document : WG-FSA-02/52