Résultats de la recherche
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Satellite tracking of black-browed and light-mantled sooty albatrosses from Heard Island and potential interactions with fisheries
foraged on the shelf break within 150 km of Heard Island, and focused 75% of their foraging time in waters ... date in the longline fishery), although in 2005 seven black-browed albatrosses were killed in the ... a further 5% went beyond either EEZ into the high seas north and east of Heard Island. In contrast ...
Meeting Document : WG-FSA-05/14 : Auteur(s): K. Lawton, R. Kirkwood and G. Robertson (Australia)
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Beach debris survey, Main Bay, Bird Island, South Georgia, 2002/03
recorded in 2001/02 and the lowest levels of beach debris during summer since the first year of recording ... in 1990/91. The distribution of debris between summer and winter was similar to the previous year ... (3.6 kg) was a decrease of 1 kg since last year. There was a decrease in the proportion of nylon ... reduction in fishing gear found on the beach throughout the recording period, particularly during the winter ...
Meeting Document : SC-CAMLR-XXIII/BG/13 : Auteur(s): Delegation of the United Kingdom
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Antarctic fur seal population dynamics update and assessment of census error at SSSI No. 32, Livingston Island, South Shetlands, Antarctica (2000/2001)
of Antarctic fur seals, Arctocephalus gazella, in the South Shetland Archipelago. Since all censuses ... was developed for assessing uncertainties in the estimates of the counts (inter and intra-observer ... identified and corresponded to beaches in which variation cannot be entirely attributed to inter-observer ... censuses in a considerable way. These factors should all be assessed and taken into account when ...
Meeting Document : WG-EMM-01/49 : Auteur(s): R. Hucke-Gaete (Chile)
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Seabird by-catch by tuna longline fisheries off southern Africa, 1998–2000
Abstract: The incidental mortality of seabirds in tuna longline fisheries is estimated for the ... bycatch differed regionally in relation to the numbers of birds attending vessels. In international waters ... seabirds are killed annually in South Africa’s EEZ, of which 70% are albatrosses. Confidence in these ...
Meeting Document : WG-FSA-01/28 : Auteur(s): P.G. Ryan, D.G. Keith and M. Kroese (South Africa)
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Foraging partitioning between giant petrels Macronectes spp. and its relationship with breeding population changes at Bird Island, South Georgia
females in both species. Sex differences agree with previous observations on diet and on attendance at ... may be reduced by the limited overlap in the activity range, with southern giant petrels foraging ... further south than northern giant petrels, suggesting some spatial partitioning in foraging areas. Male ... during the breeding season on fur seals, which have increased exponentially in recent years, may be ...
Meeting Document : WG-FSA-99/39 : Auteur(s): J. González-Solís, J.P. Croxall and A.G. Wood (United Kingdom)
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EFFECT OF STERN-SETTING TUNNEL ON THE SINK RATE OF INTEGRATED WEIGHT LONGLINE (IWL)
steel tube, built in to the longliner during a dry-dock refit. The tube angles downwards from where the ... line exits the baiting machine, which is positioned in the aft section of the stern setting deck, to ... longlines, conforming to the CCAMLR standard specified in conservation measure 24-02, is planned to be ... tested in a series of sets using time-depth recorders during current sea-trials and approximately three ...
Meeting Document : WG-FSA-08/38 : Auteur(s): I. Hay and G. Robertson (Australia)
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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 : Auteur(s): 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 : Auteur(s): 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 : Auteur(s): D.S. Butterworth and R.B. Thomson (South Africa)
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The diet of Antarctic fur seals Arctocephalus gazella during the breeding season at Heard Island
Heard Island fed mainly on fish with an average 95.2% of scats in monthly collections containing fish ... and skate (Bathyraja sp.), the latter being found in over 60%-of scats in October and November. The ... . There the increase is thought to be due to the high availability of krill E. superba, but, in the ... on Heard Island grounds must be considered in this light. Author(s): Delegation of Australia Title ...
Meeting Document : SC-CAMLR-VIII/BG/53 : Auteur(s): Delegation of Australia