Resultados de la búsqueda
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Net sample validation of acoustic techniques used to identify and size Antarctic krill
species groups has been attempted using differences in echo strength at two acoustic frequencies (ΔMVBS ... ). Here we compare net and acoustic data from 2 cruises around South Georgia in 1996 in order to assess ... echo-charts were also identified as krill on the basis of their difference in backscatter at 38 and 120 ... frequency data and compared with that obtained in net hauls. This comparison revealed that a simplified bent ...
Meeting Document : WG-EMM-97/46 : Autor(es): Watkins, J.L., Brierley, A.S.
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Trophic relations of the cephalopod Martialia hyadesi (Teuthoidea: Ommastrephidae) at the Antarctic Polar Front, Scotia Sea
Sea in February 1989. The dissected stomachs of 61 specimens were classified according to fullness and ... items in the squid's diet were the myctophid fishes Krefftichthys anderssoni and Electrona ... squid mantle length. Over the size range of squid in the sample there was no relationship between size ... preference was related to squid size. The prevalence of copepod-feeding myctophids in the diet of this squid ...
Meeting Document : SC-CAMLR-XI/BG/11 : Autor(es): Delegation of United Kingdom
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Possible effects of different levels of fishing on krill on predators - some initial modelling attempts
Meeting of the CCAMLR's WG-Kril1 and WG-CEMP in 1992 to address this issue. First. estimates are made ... developed, in which krill abundance fluctuations impact the predator population, but not vice versa ... . Computations based on this model indicate that variability in the annual recruitment of krill results in ... predator population dynamics information in the context of the models developed, and about the model1ing of ...
Meeting Document : WG-KRILL-93/43 : Autor(es): D.S. Butterworth and R.B. Thomson (South Africa)
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Quantitative stock survey and some biological and morphometric characteristics of the deep-sea red crab Geryon quinquedens off south west Africa
Abstract: In order to assess the abundance of the red crab Geryon quinquedens, two otter-trawl ... cruises were undertaken in July and September 1978, on the continental slope off South West Africa. A ... width, whereas the mode for males was at 11.2 cm. In general. larger animals tended to inhabit shallower ... states indicated that males were predominantly in the inter-moult stage while most females were either ...
Meeting Document : WS-CRAB-93/22 : Autor(es): C.J. De B. Beyers and C.G. Wilke (South Africa)
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Fish prey of the wandering albatross Diomedea exulans at South Georgia
between years but epipelagic fish were significantly more abundant in +I983 than 1984. All identified fish ... caught in the commercial fishery there. However, two of the three main target species of this fishery in ... fish prey but how they catch several species, including Muraenolepis, which are mainly benthic in habit ... is unknown. Published in: Polar Biology (1998) 8: 000-000 Author(s): J.P. Croxall, A.W. North and ...
Meeting Document : SC-CAMLR-VII/BG/05 : Autor(es): J.P. Croxall, A.W. North and P.A. Prince (United Kingdom)
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Annual Report from SCAR to CCAMLR
). SCAR looks to CCAMLR as a key partner in this initiative. Three new potential Scientific Research ... , Thresholds and Resilience (AntETR), State of the Antarctic Ecosystem (AntEco) and Antarctic Climate in the ... /). In particular, the SCAR-MarBIN data portal continues to gather information on marine biodiversity in ... in mutually beneficial ways. For further details see www.scar.org Author(s): Submitted by SCAR Title ...
Meeting Document : CCAMLR-XXX/BG/15 : Autor(es): Submitted by SCAR
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An initial examination of using CPUE as a fishery performance index for the krill fishery
Abstract: Early analyses of CPUE in the krill fishery concluded that it was not a useful index of ... extent to which these reflect changes in krill abundance are key elements of developing feedback ... period 2001 – 2016 (up to 26/5/2016) in Subareas 48.1, 48.2 and 48.3 to determine whether CPUE might be ... difference between this overall mean and the mean for each year in which the vessel fished. An overall ...
Meeting Document : WG-EMM-16/10 : Autor(es): CCAMLR Secretariat
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Southern right whale (Eubalaena australis) reproductive success is influenced by krill (Euphausia superba) density and climate
condition and, therefore, on foraging success. This, in turn, might be affected by climatically driven ... change in the abundance of the species main prey, krill (Euphausia superba), on the feeding grounds ... between 1997 and 2013 in southern Brazil, where the species concentrate during their breeding season. The ... influence southern right whale breeding success in southern Brazil by determining variation in food (krill ...
Meeting Document : WG-EMM-16/P06 : Autor(es): E. Seyboth, K.R. Groch, L. Dalla Rosa, K. Reid, P.A.C. Flores and E.R. Secchi
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Diet overlap among top predators at the South Orkney Islands, Antarctica
Abstract: In order to understand interspecific trophic relationships among top predators, we ... analyzed diet information on nine bird and two seal species collected in the austral summer from 1996 to ... variable diets. This variability may be explained by fluctuations in krill availability. In years when ... fish, which increases the re-occurrence of these preys in the diets. Our samples suggest the recovery ...
Meeting Document : WG-EMM-18/04 : Autor(es): M.L. Bertolin and R. Casaux
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Can the chemistry of otolith nuclei determine population structure of Patagonian toothfish Dissostichus eleginoides?
to South Georgia in the Southern Ocean. Concentrations of 55Mn, 88Sr, and 137Ba, ratioed to 42Ca ... , showed a sharp population boundary in the vicinity of the Polar Front, between South Georgia and the ... population structure in Patagonian toothfish, demonstrating that otolith nucleus chemistry can discriminate ... between populations even in fully marine environments. Moreover, the nucleus chemistry indicated ...
Meeting Document : WG-FSA-06/P2 : Autor(es): Ashford, J.R., A.I. Arkhipkin and C.M. Jones