Résultats de la recherche
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Diet and foraging effort of Adélie penguins in relation to pack-ice conditions in the southern Ross Sea
1996-97. During the study period, pack-ice cover differed in waters offshore of these colonies, by ... years when pack ice was sparse. Foraging trip duration differed by colony, season and year and was ... longest trips more of the food gathered by parents was used for self maintenance; on longest trips ...
Meeting Document : WG-EMM-98/15 : Auteur(s): D.G. Ainley (USA), P.R. Wilson, K.J. Barton (New Zealand), G. Ballard, N. Nur (USA) and B. Karl (New Zealand)
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The influence of environmental variables and mitigation measures on seabird catch rates in the Japanese tuna longline fishery within the Australian Fishing Zone, 1991–1995
accurate assessment was further complicated by ongoing changes to fishing practices and equipment, and due ... data relating to factors affecting seabird bycatch which is currently collected incidentally by ... may be lowered by the use of bird lines, bait throwing machines and thawed baits. However, appropriate ...
Meeting Document : WG-FSA-98/32 : Auteur(s): N. Brothers, R. Gales and T. Reid (Australia)
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Seabird mortality in the Japanese tuna longline fishery around Australia, 1988–1995
) by Japanese longline vessels targeting tuna. In recent years the estimated rate of seabird bycatch in ... collection of seabird bycatch data (by observers whose priority is to fish sampling tasks) renders the ... were characterised by unequal representation of sex and age cohorts. and these unequal representations ...
Meeting Document : WG-FSA-98/31 : Auteur(s): N. Brothers, R. Gales and T. Reid (Australia)
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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 ... -annual variability which is linked to large-scale climate variability, indicated and probably mediated by ... warm water inflow were followed by reduced icefish catches, a paucity of krill in icefish and penguin ...
Meeting Document : WG-EMM-09/23 : Auteur(s): S. Hill, M. Belchier, M. Collins, S. Fielding, E. Murphy, P. Trathan, H. Venables and C. Waluda (United Kingdom)
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Variation in echosounder calibration with temperature and some possible implications for acoustic surveys of krill biomass
Abstract: Accurate estimation of krill biomass by acoustic techniques is dependant upon a number ... differences in gain settings, then integrated 120 kHz echo signals would be under-reported by 2.8 dB, leading ... in turn to an under-estimation of krill biomass by 52.5 %. Every effort should therefore be made to ...
Meeting Document : WG-EMM-97/52 : Auteur(s): Watkins, J.L., Woodroffe, P., Brierley, A.S., Goss, C.
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Algunos aspectos biologicos relevantes a la explotacion de la merluza negra (Dissostichus eleginoides Smitt, 1898) en la zona economica exclusiva argentina y sector oceanico adyacente
Abstract: This work aims to the study of the distribution, size structure by depth, first ... eleginoides) in the Argentine Sea, and atempts some explanation by a trophic analysis of such distribution ... explained partially by canibalism and the size of the available preys at different depth. According to the ... depth. Greatest concentration areas were found south and NE of the Malvinas Islands, over the slope of ...
Meeting Document : WG-FSA-97/49 : Auteur(s): Almeyda, S.M., Prenski, L.B.
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Swimming speed and allocation of time during the dive cycle of Antarctic fur seals
than was exhibited by animals when swimming at the surface. Swimming speeds were fastest during the ... duration and was influenced by diving swimming speed. This relationship was, on average, close to that ... predicted by a model (Houston & Carbone, Behav. Ecol., 3, 255-265) which suggested that the metabolic ...
Meeting Document : WG-EMM-95/25 : Auteur(s): Bevan, R.M., Boyd, I.L., Reid, K.
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Demographic studies of Antarctic krill Euphausia superba Dana in the Cooperation and Cosmonaut Seas (Indian sector of the Southern Ocean)
Bertalanffy growth curves calculated for different areas are similar to those obtained by Australian ... was clearly dominated by individuals of age 4+. The coefficients of natural mortality (M) of E.superba ... in the Indian sector of the Southern Ocean, calculated by the methods of Alverson & Carney ...
Meeting Document : WG-Krill-94/16 : Auteur(s): E.A. Pakhomov (Ukraine)
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A revised assessment of the impact of the krill fishery on penguins in the South Shetlands
penguins was also insignificant. Furthermore, less similarity between krill caught by trawlers and those ... captured by penguins was observed. The above mentioned results imply a low level of competition between the ... 3 tonnes/half-month period) is smaller by one or more orders of magnitude within the localized areas ...
Meeting Document : WG-Joint-94/17 : Auteur(s): T. Ichii, M. Naganobu and T. Ogishima (Japan)
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Diving pattern and performance in nonbreeding gentoo penguins (Pygoscelis papua) during winter
were followed by surface intervals two to three times dive duration. Deep dives showed clear diel ... in Gentoo Penguins is changed by varying the frequency and duration of foraging trips, rather than by ...
Meeting Document : WG-CEMP-92/37 : Auteur(s): T.D. Williams (United Kingdom), A. Kato (Japan), J.P. Croxall (United Kingdom), Y. Naito (Japan), D.R. Briggs, S. Rodwell and T.R. Barton (United Kingdom)