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Modelling the dynamics of krill populations in the Antarctic Peninsula region
Abstract: The current long-term estimates of mean recruitment rates suggest that the population ... estimates of recruitment to the population can be used to model in detail interannual variation in the ... population dynamics of krill and estimate the expected mortality rates. A number of models of the population ... dynamics of krill are used to assess to what extent they can explain the observed changes in the density of ...
Meeting Document : WG-EMM-99/56 : Autor(es): E.J. Murphy (United Kingdom), A. Constable (Australia) and D. Agnew (United Kingdom)
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Increase in relative abundance of fjord Notothenia rossii in Potter Cover, South Shetland Islands, after the decrease associated with commercial fishing in the area
Abstract: A monitoring program of demersal fish in inshore sites of the South Shetland Islands ... has continued in Potter Cove from 1991 to 1999, covering a continuous sampling period of sixteen years ... of fjord fishes of the species Notothenia rossii and Gobionotothen gibberifrons in relation to the ... previous study, is still evident. An increasing trend of N. rossii catches was observed, but the actual ...
Meeting Document : WG-FSA-99/30 : Autor(es): E.R. Barrera-Oro, E.R. Marschoff and R.J. Casaux (Argentina)
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ALLOCATING THE PRECAUTIONARY CATCH LIMIT FOR KRILL AMONGST THE SMALL-SCALE MANAGEMENT UNITS IN AREA 48: THE IMPLICATIONS OF DATA UNCERTAINTIES
fishery in Statistical Area 48. This procedure will involve, inter alia, subdivision of the precautionary ... catch limit among a set of small-scale management units. So far the Working Group has identified six ... candidate methods for subdividing the catch limit and rejected one of them as unsuitable (Option 1 ... - subdivision based on the distribution of historical catches). In recognising the need for a “staged ...
Meeting Document : WG-EMM-08/12 : Autor(es): P.N. Trathan and S.L. Hill (United Kingdom)
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Multiyear changes in distribution and abundance of Salpa thompsoni in the Western Antarctic Peninsula region
characterized by a circumpolar distribution and its appearance is clearly associated with the occurrence of the ... Antarctic Circumpolar Current (ACC). This area of the Southern Ocean is characterized by a relatively low ... productivity and high water temperature. In recent years the expansion of distribution range of this ... invertebrate species has been observed. This process may be a result of the ACC southward movement, which is ...
Meeting Document : WG-EMM-16/75 : Autor(es): A. Panasiuk, A. Słomska, J. Wawrzynek, M. Konik and A. Weydmann
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A RE-ANALYSIS AND UPDATE OF THE ANTARCTIC KRILL BIOMASS IN THE SOUTH SHETLAND ISLANDS, THROUGH 2011
Abstract: Acoustically based estimates of Antarctic krill (Euphausia superba) biomass, and net ... -based estimates of krill density and recruitment are recalculated for the years 1996 through 2011 ... . The time series of acoustic biomass indicate that krill have varied by more than an order of magnitude ... based data show that 2011 was a year of good recruitment, following two years of low recruitment. Krill ...
Meeting Document : WG-EMM-11/26 : Autor(es): A. Cossio, C. Reiss and R. Driscoll (USA)
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Proportional recruitment indices of Antarctic krill from Japanese fisheries data in Subareas 48.1, 48.2 and 48.3 during 1980 through 1997
from logbook data of Japanese commercial krill fisheries during 1980 to 1997. Inter-annual patterns of ... Siegel et al. (1 998)'s values. This may be due to the net selectivity and/or incomplete coverage of ... the distribution of small krill by commercial fisheries. Inter-annual pattern of R1 and R2 in Subarea ... 48.2 showed somewhat similar pattern to Subarea 48.1. However, because of inconsistency of the ...
Meeting Document : WG-EMM-98/33 : Autor(es): S. Kawaguchi, T. Ichii and M. Naganobu (Japan)
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Interannual changes in body fat condition, stomach content mass and distribution of minke whales in Antarctic Areas IV and V
Abstract: As an indicator of body fat condition, interannual variability in girth of minke whales ... of minke whales in Antarctic Areas IV (70°-130° E) and V (130° E-170°W) from 1989/90 to 1994/95. Of ... the six years included in the study, two were categorized as years of poor body fat condition, and ... three as years of good condition. Estimated body weight gain during the feeding season in poor years was ...
Meeting Document : WG-EMM-97/18 : Autor(es): Ichii, T., Nishiwaki, S., Tamura, T., Fujise, Y., Matsuoka , K.
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Modern data on parasitofauna of Dissostichus mawsoni and by-catch species from logline fishing in Antarctica
Abstract: Parasites are one of an integral part of any ecosystem and unfortunately knowledge ... of Antarctic circumpolar ecosystem plays its role on existence of endemic forms of animals, including ... parasites, which sometimes have unpredictably large sizes and distribution. The best example of it ... – Lophoura szidati. In this work we conclude the results of preliminary analysis of collected parasites of ...
Meeting Document : WG-FSA-12/P09 : Autor(es): I.I. Gordeev and S.G. Sokolov
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Reports on biological information of toothfish with special reference to bycatch, depredation and spawning dynamics in Division 58.4.4 a & b by Shinsei maru No. 3 during 2008–14 seasons
weight and number, accounting for 93% and 76% of the total catch, respectively, among total of 16 species ... method and grenadier bycatch method by Gasco et al. (2014) using two size levels of unit cell, and ... SSRU 58.4.4bC. The depredation rate in weight of whales toward toothfish was estimated to be only 3.8 ... -4.8 % in SSRU 58.4.4bC during 2008-12 using the CPUE method, while the presence/absence of whales was ...
Meeting Document : WG-FSA-15/21 : Autor(es): K. Taki and T. Ichii (Japan)
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Ecoregionalisation of the Kerguelen and Crozet islands oceanic zone. Part I: Introduction and Kerguelen oceanic zone
Antarctiques Françaises. The workshop listed general conservation objectives to evaluate boundaries of ... habitats, life history traits,…). This report is a summary of the conclusions based on expert knowledge. It ... is divided into three parts:- A summary of the ecological characteristics of the Kerguelen ... oceanic zone;- The ecoregionalisation of the pelagic realm, the benthic realm and the top ...
Meeting Document : WG-EMM-16/43 : Autor(es): P. Koubbi, C. Guinet, N. Alloncle, N. Ameziane, C.S. Azam, A. Baudena, C.A. Bost, R. Causse, C. Chazeau, G. Coste,C. Cotté, F. D'Ovidio, K. Delord, G. Duhamel, A. Forget, N. Gasco, M. Hautecœur, P. Lehodey, C. Lo Monaco, C. Marteau, A. Martin, C. Mignard, P. Pruvost, T. Saucède, R. Sinegre, T. Thellier, A.G. Verdier and H. Weimerskirch