Resultados de la búsqueda
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Laboratory target strength measurements of free swimming Antarctic krill (Euphausia superba)
single animal insonifications. For mean length classes in the range [29.6, 36.2] mm the median single ... -animal target strengths are in the range [-76.7,-71.8] dB. Monte Carlo computer simulations were used to ... evaluate the effects of varying the ratio of largest to smallest echo amplitudes for a given ensemble, thus ... bias was then determined for each ensemble of experimental data and used to determine corrections which ...
Meeting Document : WG-EMM-97/75 : Autor(es): Pauly, T., Penrose, J.D.
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Trends of Antarctic fur seal population at SSSI No. 32, Livingston Island, South Shetlands, Antarctica
parameters to an environmental index (the Southern Ocean Oscillation Index- SOI). Two fur seal censuses were ... environmental phenomena if the population is under a monitoring programme, and may have an interesting effect on ... Abstract: We update in this paper the previously reported model for the Antarctic fur seal ... . From this, we estimated an overall increase of 17% in the total population, including in this figure a ...
Meeting Document : WG-EMM-99/16 : Autor(es): R. Hucke-Gaete, D. Torres, A. Aguayo, J. Acevedo and V. Vallejos (Chile)
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Cetaceans as indicators of historical and current changes in the East Antarctica ecosystem
Antarctic minke whales could have decreased in recent years. Decrease in availability of krill for this ... the East Antarctica ecosystem in the context of two hypotheses, the ‘krill surplus’ hypothesis in the ... middle of the past century and the recovery of krill-eater large whales since the 1980’s. There was an ... interest to investigate the effects of those events on other krill predators such as the Antarctic minke ...
Meeting Document : WG-EMM-16/64 : Autor(es): Y. Fujise and L.A. Pastene
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REPORT OF THE SECOND MEETING OF THE SEABIRD BYCATCH WORKING GROUP, HERMANUS, SOUTH AFRICA, 17-18 AUGUST 2008
fell into two broad categories: those focused on the trawl warps, and those focused around trawl nets ... . For reducing seabird strikes on trawl warps, the use of bird-scaring lines has been proven to be the ... warp strikes, there continues to be the need for more work on effective measures for reducing seabird ... a useful model for ACAP, noting that an observer program with high levels of coverage had been ...
Meeting Document : WG-FSA-08/61 : Autor(es): ACAP Seabird Bycatch Working Group
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MITIGATION OF SEABIRD CAPTURES DURING HAULING IN CCAMLR LONGLINE FISHERIES
Abstract: In recent years there has been an increased focus on reducing ‘residual’ seabird ... suggests that there are two key aspects of effective BED, firstly that they provide a deterrent to birds ... three types and recommendations are made on a Type III BED that was developed in Division 58.5.2 and ... incorporates the two key functional characteristics required to reduce seabird captures during the haul ...
Meeting Document : WG-IMAF-09/14 : Autor(es): E. Reid, B. Sullivan (BirdLife International), K. Reid (Secretariat) and J. Clark (United Kingdom)
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Entanglement of Antarctic fur seals (Arctocephalus gazella) in man-made debris at Signy Island, South Orkney Islands, 2004/05
Island, South Orkney Islands are reported for the 2004/05 summer season. There were two sightings of ... one case the entangling material had become attached to a rock and the animal was tethered to the ... ground. The incidence of entanglement at Signy Island, albeit very low, highlights the need for CCAMLR ...
Meeting Document : SC-CAMLR-XXIV/BG/18 : Autor(es): Delegation of the United Kingdom
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Adélie penguins as indicators of the state of the sea-ice in Adélie Land
weakened young chicks. While we haven’t seen yet the consequences of this “zero year” on the demography of ... Island, Terre Adélie, failed to fledge their chicks. This catastrophic breeding failure resulted from two ... factors. First, the season saw an extreme sea-ice extent that forced Adélie parents to cover great ... desertion by the partner and the risk of dying of prolonged fast for the chick(s). Second, the season was ...
Meeting Document : WG-EMM-17/01 Rev. 1 : Autor(es): Y. Ropert-Coudert, A. Kato and C. Barbraud
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Adélie penguin foraging behaviour and breeding success in seasons of contrasting krill availability (Mawson Coast, Antarctica)
period. Data on meal mass and foraging trip duration were combined to provide an index of provisioning ... Abstract: Parameters measured under the CCAMLR Ecosystem Monitoring Program (CEMP) for Adélie ... present during the two-week survey period in 2001 than in 2003. Penguin parameters that showed significant ... differences between the two seasons included A5: foraging trip duration, A6: breeding success and A8: meal ...
Meeting Document : WG-EMM-03/44 : Autor(es): J. Clarke, M. Tierney, S. Candy, S. Nicol, L. Irvine and K. Kerry (Australia)
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Entanglement of Antarctic fur seals (Arctocephalus gazella) in man-made debris at Bird Island, South Georgia, during the 2002 winter and 2002/03 breeding season
observations), the reasons for this are discussed. Of the entanglements where the animal could be sexed, males ... Georgia for the thirteenth consecutive winter (2002) and fifteenth consecutive summer (2001/02) are ... %. Severe injuries accounted for 33% of entanglements over winter and 25% during the summer. As in previous ... years, most individuals observed entangled in debris were juveniles (88% of winter and 81% of summer ...
Meeting Document : SC-CAMLR-XXII/BG/11 : Autor(es): Delegation of the United Kingdom
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Breeding and post-breeding foraging locations of Adélie penguins at Hope Bay/Esperanza, Antarctic Peninsula
dispersal are consistent across years, suggesting that the Bransfield- Weddell shift region is an important ... /Esperanza, during the late part of the breeding season and their subsequent post breeding dispersal in two ... consecutive years. We also compare data from the krill fishery to describe Adélie penguin foraging areas with ... colony and in the northern Bransfield Strait/Mar de la Flota in both years. During the pre-moulting ...
Meeting Document : WG-EMM-14/42 : Autor(es): M.M. Santos (Argentina), P.N. Trathan (UK), S. Thanassekos (Secretariat), E.F. Rombolá, M.A. Juáres (Argentina), K. Reid (Secretariat) and J.T. Hinke (USA)