Resultados de la búsqueda
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Geographic aspects of Euphausia superba resources exploitation
adjacent waters (subregions outside of the Scotia Sea are under pecular attention) are observed ... . Concentration of E.superba of the same order of biomass volume as in the Scotia Sea were observed at several ... subregions along the peripherie of Weddell Gyre and also nearshore of Antarctide. Offshore concentrations of ... areas should include the preliminar getting of knowledges on changeability of E.superba aggregation ...
Meeting Document : WG-KRILL-93/04 : Autor(es): R.R. Makarov (Russia)
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Status of krill target strength
Abstract: Empirical estimates for the target strength of krill are extracted from the literature ... cause of bias in single-animal measurements, namely thresholding. Theoretical estimates for the target ... strength are derived from the deformed-cylinder scattering model assuming specific sets of physical and ... orientational parameters, for which there is an empirical basis. The theoretical estimates show a non-monotonic ...
Meeting Document : WG-KRILL-92/11 : Autor(es): K.G. Foote (Norway), D. Chu and T.K. Stanton (USA)
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Geographic aspects of Euphausia superba resources exploitation
adjacent waters (subregions outside of the Scotia Sea are under pecular attention) are observed ... ° Concentration of E.superba of the same order of biomass volume as in the Scotia Sea were observed at several ... subregions along the peripherie of Weddell Gyre and also nearshore of Antarctide. Offshore concentrations of ... areas should include the preliminar getting of knowledges on changeability of E.superba aggregation ...
Meeting Document : WG-CEMP-92/31 : Autor(es): R.R. Makarov (Russian Federation)
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Research plan for toothfish in Division 58.4.4 b by Shinsei maru No. 3 in 2015/16
results using CASAL models in research block 58.4.4b_1 are described in a separated document. The ... and CASAL OB_1b model (vulnerable biomass in 2014), respectively. The stock sizes of D. eleginoides in ... block 58.4.4b_2 is estimated at 648 tonnes only by using CPUE method, as the catch and tagging data in ... the current research operation for the next fishing season with the same survey design and total ...
Meeting Document : WG-SAM-15/13 : Autor(es): Delegation of Japan
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Dietary studies of Adélie penguins through faecal DNA analysis
Abstract: The composition of penguin diet is currently monitored through the A8 CEMP Chick Diet ... monitoring parameter. The current Standard Method involves stomach lavage to collect the stomach contents of ... adult birds and sorting the samples to identify prey composition and mass. At WG-EMM-12 it was noted ... , procedures were under consideration. Here we discuss results from recent work using the extraction of prey ...
Meeting Document : WG-EMM-17/13 : Autor(es): L. Emmerson, B. Deagle, C. Waluda, M. Dunn, P. Trathan and C. Southwell
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Competition-induced starvation drives large-scale population cycles in Antarctic krill
Abstract: Antarctic krill (Euphausia superba)—one of the most abundant animal species on Earth ... . Previous studies have postulated that the krill cycle is induced by periodic climatological factors, but ... , we identify intraspecific competition for food as the main driver of the krill cycle, while external ... that the cycle amplitude increases with reduction of krill loss rates. Thus, a decline of apex ...
Meeting Document : WG-EMM-18/P05 : Autor(es): A.B. Ryabov, A.M. de Roos, B. Meyer, S. Kawaguchi and B. Blasius
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Foraging strategies of chinstrap penguins at Signy Island, Antarctica: importance of benthic feeding on Antarctic krill
Abstract: Chinstrap penguins Pygoscelis antarctica are one of the major consumers of Antarctic ... krill Euphausia superba in the Southern Ocean. To examine their foraging strategy, we studied foraging ... trips). The diving depths of our study birds were much deeper (to 179 m) than previous studies on this ... maximum depth, the typical characteristics of benthic dives. These benthic-type dives were more abundant ...
Meeting Document : WG-EMM-03/37 : Autor(es): A. Takahashi (Japan), M.J. Dunn, P.N. Trathan (United Kingdom), K. Sato, Y. Naito (Japan), J.P. Croxall (United Kingdom)
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MULTIPLE INDICATORS SUGGEST A STRONG ECOSYSTEM ANOMALY AT SOUTH GEORGIA IN 2009
Abstract: The marine pelagic system around South Georgia is characterised by considerable inter ... local oceanographic and atmospheric conditions. Much of the observed variability in various fitness ... metrics for birds, seals and fish seems to be connected with the availability of Antarctic krill ... , Euphausia superba, which is a major prey species for many vertebrate populations at South Georgia. The ...
Meeting Document : WG-EMM-09/23 : Autor(es): S. Hill, M. Belchier, M. Collins, S. Fielding, E. Murphy, P. Trathan, H. Venables and C. Waluda (United Kingdom)
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UPDATED PRELIMINARY RESULTS OF AN ECOLOGICAL RISK ASSESSMENT FOR SEABIRDS AND MARINE MAMMALS WITH RISK OF FISHERIES INTERACTIONS
identify areas or species requiring additional management or monitoring. Our study indicated that the risk ... particularly strong overlap between fishing effort and species ranges. We tested the sensitivity of the ... adding a factor of population. We found the outcomes of the PSA analyses were robust to these effects ... . However, adult survival rates did influence the rankings, and were identified as a key parameter requiring ...
Meeting Document : WG-FSA-08/51 : Autor(es): S. Waugh, D. Filippi, N. Walker (New Zealand) and D.S. Kirby
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An assessment of seabird interactions with longlining operations for Dissostichus eleginoides around South Georgia, March–May 1997
interactions with seabirds, and the effectiveness of measures employed to mitigate seabird mortality. In this ... study 61 lines were laid during April and May, all set at night using the Spanish double-line method ... with extra weights on the line and all deck-lights extinguished. Data were recorded during hauling ... into the side of the vessel. Few birds were generally seen following the vessel during setting ...
Meeting Document : WG-FSA-97/09 : Autor(es): Ashford, J.R., Croxall, J.P.