Résultats de la recherche
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A review of data on abundance, trends in abundance, habitat use and diet of ice-breeding seals in the Southern Ocean (submitted to the 2008 Joint CCAMLR-IWC Workshop)
-breeding seals in the Southern Ocean (submitted to the 2008 Joint CCAMLR-IWC Workshop) Abstract ... / Description: The development of models of marine ecosystems in the Southern Ocean is becoming increasingly ... habitats of the Southern Ocean (i.e. crabeater seal, Lobodon carcinophaga; Ross seal, Ommatophoca rossii ... are identified and discussed. Spatial and temporal gaps in knowledge of the populations, habitats and ... the fast-ice edge in Prydz Bay remained close to their tagging site with no evidence of pronounced ... (1962) would have underes- timated true densities because no adjustment was made for the number of ... et al. (1995) noted that the only crabeater seal that left the pack-ice crossed a large bay of open ... studies found no evidence for preferences (Bester et al., 1995). Burns et al. (2004) concluded that the ...
Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 49–74 : Auteur(s): Southwell, C., J. Bengtson, M. Bester, A.S. Blix, H. Bornemann, P. Boveng and M. Cameron, J. Forcada, J. Laake, E. Nordøy, J. Plötz, T. Rogers, D. Southwell, D. Steinhage, B.S. Stewart and P. Trathan
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Precautionary spatial protection to facilitate the scientific study of habitats and communities under ice shelves in the context of recent, rapid, regional climate change
Paper Title: Precautionary spatial protection to facilitate the scientific study of habitats and ... communities under ice shelves in the context of recent, rapid, regional climate change Abstract / Description ... : Recent rapid climate change is now well documented in the Antarctic, particularly in the Antarctic ... Peninsula region. One of the most evident signs of climate change has been ice-shelf collapse; overall, 87 ... volume of deep water in Pine Island Bay has increased in recent years. Faster basal melting under the ... collapsing ice shelves and retreating glaciers. However, there has been no resolution about the best way to ... tip of the Antarctic Peninsula. No commercial fishing took place south of Antarctic Sound at the tip ... closed some 23 years later. No com- mercial catch has ever been conducted east of the Antarctic ...
Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 139–151 : Auteur(s): Trathan, P.N., S.M. Grant, V. Siegel and K.-H. Kock
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A first step towards modelling the krill–predator dynamics of the Antarctic ecosystem
Paper Title: A first step towards modelling the krill–predator dynamics of the Antarctic ... ecosystem Abstract / Description: The history of human harvests of seals, whales, fish and krill in the ... Antarctic is summarised briefly, and the central role played by krill emphasised. The background to the ... hypothesis of a krill surplus in the mid-20th century is described, and the information on population and ... (2005) report that in the deep parts of the Ross Sea and Prydz Bay, minke whales feed on E ... details in the ‘Discussion’ section). Although no direct inferences can be made, there are several ... harvesting of the krill-feeding large baleen whales. Since there is no ... population observable on the ice during moults. No firm conclusion on this matter has been reached, but the ...
Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 217–277 : Auteur(s): Mori, M. and D.S. Butterworth
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Abundance, size and maturity of krill (Euphausia superba) in the krill fishing ground of Subarea 48.1 during the 1990/91 austral summer
Paper Title: Abundance, size and maturity of krill (Euphausia superba) in the krill fishing ... ground of Subarea 48.1 during the 1990/91 austral summer Abstract / Description: Acoustic and net ... sampling surveys for krill were conducted in the krill fishing ground north of the South Shetland Islands ... of krill were observed. The survey area was divided into four zones: oceanic, slope frontal, neritic ... current along the shelf break, before becoming trapped in Barclay Bay on the northern side of Livingston ... (EUPHAUSIA SUPERBA) IN THE KRILL FISHING GROUND OF SUBAREA 48.1 DURING THE 1990/91 AUSTRAL SUMMER T ... conducted in the krill fishing ground north of the South Shetland Islands from 18 January to 3 February ... 1991. Distinct offshore-inshore heterogeneities in abundance and maturity of krill were observed. The ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 183–199 : Auteur(s): Ichii, T., H. Ishii and M. Naganobu
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Bias in the estimation of krill yield from using a deterministic formulation of the median unexploited spawning biomass
median pre-exploitation spawning biomass and, thus, requires no correction. This paper examines the ... Paper Title: Bias in the estimation of krill yield from using a deterministic formulation of the ... median unexploited spawning biomass Abstract / Description: Two Monte Carlo simulation models, the krill ... yield model and the generalised yield model (GYM), are currently available to CCAMLR that can be used ... , requires no correction. This paper examines the effects of the biased estimates of the median pre ... , the median level of escapement at the end of the projection period with no catches will not be ... no catches. However, they did not provide advice on how the biased estimate, S,, might affect the ... escapement at the end of the projection period should be equal to 1 when no catches are taken (stochastic ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 1–8 : Auteur(s): Constable, A.J. and W.K. de la Mare
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On the power to detect changes using the standard methods for monitoring parameters of predatory species
Paper Title: On the power to detect changes using the standard methods for monitoring parameters ... of predatory species Abstract / Description: The CCAMLR guidelines (CCAMLR, 1989) for analyzing the ... statistical power to detect changes are applied using variance estimates from studies at the South Shetland ... trip duration (C2.0). The other Standard Methods are not evaluated because the power analysis in the ... complexity of some of the designs, there may be no general formula for evaluating power or determining a ... from the study by Trivelpiece et al. (1989) at Admiralty Bay, King George Island (62°10'S, 58°30'W ... sample sizes for detecting changes of 10%, 20% and 30% of the mean values are shown in Table 2. No ... Population Size (A3.1) There were no suitable estimates of variance for the data on breeding population ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 377–397 : Auteur(s): Boveng, P. and J.L. Bengtson
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Large-scale peculiarities of phytocenosis species composition in the surface layer in the Antarctic Atlantic and Indian Ocean sectors
phytoplankton composition was also found near the continent (Alasheev Bay). During the observation season ... Paper Title: Large-scale peculiarities of phytocenosis species composition in the surface layer ... in the Antarctic Atlantic and Indian Ocean sectors Abstract / Description: In surface phytoplankton ... dominated over vast areas within the distribution of the south peripheral waters and the centre of the ... also found near the continent (Alasheev Bay). During the observation season maximum biomass values of ... PHYTOCENOSIS SPECIES COMPOSITION IN THE SURFACE LAYER IN THE ANTARCTIC ATLANTIC AND INDIAN OCEAN SECTORS ... the distribution of the south peripheral waters and the centre of the Weddell Gyre. In the eastern ... Weddell Gyre a great change in the composition of phytoplankton species was registered. Variability in ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 201-214 : Auteur(s): Makarov, R.R. and K.P. Fedorov
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A first attempt at an assessment of the Patagonian toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands EEZ
Paper Title: A first attempt at an assessment of the Patagonian toothfish (Dissostichus ... eleginoides) resource in the Prince Edward Islands EEZ Abstract / Description: The history of the fishery for ... Patagonian toothfish (Dissostichus eleginoides) in the Prince Edward Islands Exclusive Economic Zone (EEZ) is ... a robust indication that the spawning biomass has been depleted to, at most, a few percent only of ... shing enter the Prince Edward Islands EEZ in greater numbers when no legitimate South African vessels ... operators were photographed in the Prince Edward Islands EEZ. No illegal operators were sighted during ... the at-sea reconnaissance in 2000. No prosecutions have as yet been instigated by South Africa on ... , Vol. 9 (2002): 11–32 11 A FIRST ATTEMPT AT AN ASSESSMENT OF THE PATAGONIAN TOOTHFISH (DISSOSTICHUS ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 11–32 : Auteur(s): Brandão, A., D.S. Butterworth, B.P. Watkins and D.G.M. Miller
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The gentoo penguin as a candidate species for the CCAMLR Ecosystem Monitoring Program
Paper Title: The gentoo penguin as a candidate species for the CCAMLR Ecosystem Monitoring ... years at Bird Island, South Georgia and at the South Shetland Islands (both within Integrated Study ... Regions (ISRs) of the CCAMLR Ecosystem Monitoring Program), we suggest (and provide a full bibliography of ... supporting literature) that the gentoo penguin meets the specified criteria qualifying species for inclusion ... ; krill certainly not the only significant prey, (v) - breeding biology largely unknown, or (vi) - no ... ) availability of baseline data at one or more sites. On this basis, the following species were selected as ... WG-CEMP-90/14 THE GENTOO PENGUIN AS A CANDIDATE SPECIES ... FOR THE CCAMLR ECOSYSTEM MONITORING PROGRAM IP. Croxall and T.n. Williams* Abstract Based on ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 483–488 : Auteur(s): Croxall, J.P. and T.D. Williams
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Use of the Leslie stock depletion model for the assessment of local abundance of Patagonian toothfish (Dissostichus eleginoides)
potential for application of the model in some areas than in others, but in general there is no sufficiently ... Paper Title: Use of the Leslie stock depletion model for the assessment of local abundance of ... Patagonian toothfish (Dissostichus eleginoides) Abstract / Description: The Leslie depletion model has been ... used to examine local patterns in catch per unit effort (CPUE) in the longline fisheries for Patagonian ... than in others, but in general there is no sufficiently consistent signal in the data for the ... no significant movement of fish in or out of the local area. M was assumed to be not significantly ... vessels which overlapped with the series being analysed. Note that no detailed position information was ... was no change in the mean weight of individuals over the period of each of the data series. It must ...
Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 55–77 : Auteur(s): Parkes, G., C.A. Moreno, G. Pilling and Z. Young