Résultats de la recherche
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Estimation of the fishery–krill–predator overlap
by CCAMLR (catch in the Critical Period and Distance [CPD], Agnew-Phegan index, and Realised ... distributions. Only catch in the CPD can presently be used to estimate overlap in areas other than Subarea 48.1 ... . The catch in the CPD and the Agnew-Phegan index were closely correlated, as were the RPO and Schroeder ... reduced overlap in Subarea 48.1 after 1990. The RPO and Schroeder index indicated a greater increase in ...
Meeting Document : WG-EMM-99/11 : Auteur(s): Secretariat
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Antarctic's pelagic ecosystem: how environmental change will affect Salpidae population structure
Abstract: Dynamic climate changes have become noticeable in recent decades, especially in the ... - Euphausia superba. Presumably as a result of climatic fluctuations, a decrease in the numbers of this ... crustacean has been recorded, followed by an increase in the population of the gelatinous zooplankter Salpa ... thompsoni. In the inquiry herein presented, population and morphometric analyses on Salpa thompsoni have ...
Meeting Document : WG-EMM-15/P08 : Auteur(s): A.W. Słomska, A.A. Panasiuk-Chodnicka, M.I. Żmijewska and M.K. Mańko (Poland)
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A comparison of acoustic targets at South Georgia and the South Orkney Islands during a season of profound krill scarcity
Abstract: Dual frequency (38 and 120 kHz) acoustic surveys of shelf-break regions in the vicinity ... of Willis Islands, South Georgia and Coronation Island, South Orkneys, both in the Atlantic sector of ... the Southern Ocean, were carried out from RRS lames Clark Ross during January 1994. Difference in ... a new generic target strength (TS) relationship was derived. This relationship was used in ...
Meeting Document : WG-EMM-95/75 : Auteur(s): Watkins, J.L., Brierley, A.S.
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An index of per capita recruitment
)eM where R1 is the proportion of age-1 animals sampled in year y and M is the post-recruit mortality ... the population is available; and 4) the proportion of age-1 animals in the sample can be determined ... assumed in order to investigate the resulting distributions of PCR. Distributions of PCR are skewed toward ... conclusions are insensitive to changes in the shape of the functional relationship between spawners and ...
Meeting Document : WG-EMM-99/50 : Auteur(s): R. Hewitt (USA)
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Winter habitat selection by Antarctic krill will increase krill-predator-fishery interactions during ice free years
Abstract: Climate change will affect populations and fisheries in the Southern Ocean as area ... typically covered by seasonal sea-ice become ice free in some winters (Stammerjohn et al. 2008). For ... of a commercial fishery (Nicol et al. 2010; Watters et al. 2013), recent declines in seasonal sea-ice ... around the Antarctic Peninsula in winters with contrasting ice conditions provide the first acoustic ...
Meeting Document : WG-EMM-15/05 : Auteur(s): C.S. Reiss, A. Cossio, C.D. Jones, A. Murray, G. Mitchell, J. Santora, K. Dietrich, E. Weiss, C. Gimpel, J. Walsh and G.M. Watters (USA)
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Male krill grow fast and die young
examined with an extensive dataset derived from scientific surveys in the Indian Ocean sector and the ... southwest Atlantic sector, and from the krill fishery in the Southern Ocean. The percentage of males in size ... classes of adult krill was generally high in krill of 30-35 mm total length, always low in 38-42 mm krill ... , sometimes showed higher values in 45-50 mm krill, but always decreased in the largest krill (>50 mm ...
Meeting Document : WG-EMM-07/P6 : Auteur(s): S. Kawaguchi, L.A. Finley, S. Jarman, S.G. Candy (Australia), R.M. Ross, L.B. Quetin (USA), V. Siegel (Germany), W. Trivelpiece (USA), M. Naganobu (Japan) and S. Nicol (Australia)
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Cephalopod diet of the southern elephant seal (Mirounga leonina) at King George Island, South Shetland Islands
Abstract: In the austral summer of 1995/96, 25 southern elephant seals, Mirounga leonina, were ... present in 72% of the individuals sampled (n=18). Seven species of squid and 3 of octopus were identified ... . Overall, the squid species Psychroteuthis glacialis was by far the most important prey in terms of numbers ... (77%), biomass (80.8%) and frequency of occurrence (94.4%). Next in importance in terms of mass in the ...
Meeting Document : WG-EMM-99/13 : Auteur(s): G.A. Daneri, A.R. Carlini (Argentina) and P.G.K. Rodhouse (United Kingdom)
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Oil, marine debris and fishing gear associated with seabirds at Bird Island, South Georgia 1995/96
Abstract: In the third year of standardised recording of oil, fishing gear and marine debris at ... grey-headed albatrosses (two items). One gentoo penguin chick was released from entanglement in a ... were reported in association with grey-headed albatrosses (one squid jig decoy), black-browed ... (two squid jigs; six hooks swallowed and impaled (four in adults, two in chicks), the remainder being ...
Meeting Document : SC-CAMLR-XV/BG/04 : Auteur(s): Delegation of the United Kingdom
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Diet and feeding ecology of the diving petrels Pelecanoides georgicus and P. urinatrix at South Georgia
Bird Island, South Georgia. The diet of both species was dominated by crustaceans. in particular ... crustaceans in the diet of P. georgicus. and copepods, which contributed 71 % of the biomass of crustaceans in ... the diet of P. urinatrix. Calanoides acutus was the most numerous copepod in the diet of both species ... ; however, Rhincocalamus gigas was more common in P. urinatrix than in P. georgicus. The dominant amphipod ...
Meeting Document : WG-EMM-97/10 : Auteur(s): Croxall, J.P., Prince, P.A., Hill, H.J., Edwards, T.M., Reid, K.
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Further development of a krill fishery simulation model
Abstract: The model of the krill fishery presented in 1993 (wg-Krill-93/14) refined and applied ... to both Japanese and Chilean krill fishing fleets in Subarea 48.1. A stochastic element is introduced ... to account for variability in catch rates. The most successful management regime is found to be one ... the model predicts a 90% reduction in overlap with foraging predators, and a 15 to 20% reduction in ...
Meeting Document : WG-Joint-94/04 : Auteur(s): D.J. Agnew (Secretariat)