Résultats de la recherche
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Extinction risk of Antarctic and sub-Antarctic colonies of Pygoscelid penguins under climate change context
different colonies around Antarctica. In this study, the extinction risk of Adélie, Chinstrap and Gentoo ... penguins was evaluated in order to identify the most endangered colonies under present-day and future ... intraspecific competition appears as the most important endogenous factor in all colonies. In turn, the response ... reduction of carrying capacity is mediated by a decrease in food availability and appears as key factor for ...
Meeting Document : WG-EMM-2019/74 : Auteur(s): M. Huerta and S.A. Estay
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A preliminary investigation of the possible effects of rhizocephalan parasitism on the management of the crab fishery around South Georgia
levels of infection by a rhizocephalan barnacle have been found in the population of the crab Paralomis ... to declines in spawning stock. The effects of harvesting both healthy and infected animals are ... animals from the population. The need is stronger when the population is sensitive to declines in spawning ... stock. Results highlight the importance of incorporating parasitism in the design of a management ... INTRODUCTION The first fishing trip targeting crabs in Subarea 48.3, by the FV Pro Surveyor, presented in ... where the externa have been lost (Sloan, 1984). This suggests that, at least in some cases, the ... Relatively high levels of infection by a rhizocephalan barnacle have been found in the population of the ... : (i) resilience; and (ii) sensitivity to declines in spawning stock. The effects of harvesting both ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 175–192 : Auteur(s): Basson, M
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WG-EMM-96
-EMM-96/07 The relationship between foraging behaviour and energy expenditure in Antarctic fur seals ... . WG-EMM-96/10 Dynamics of Antarctic penguin populations in relation to inter-annual variability in sea ... ., Bone, D.G., Hatfield, E.M.C., Rodhouse, P.G., Prince, P.A., Watkins, J.L. WG-EMM-96/13 Developments in ... the CEMP indices 1996 Secretariat WG-EMM-96/14 Testing for normality in colony counts Secretariat WG ...
Meeting
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Diets of sympatrically breeding Adélie, gentoo and chinstrap penguins from Admiralty Bay, South Shetland Islands, Antarctica, 1981 to 2000
-annual variability in mean food load sizes during chick rearing and there was a high degree of coherence ... among the three species in the years of high versus low food loads. Adélie and chinstrap penguin adults ... experienced significant declines in body weight during the chick provisioning period in several of the latter ... Living Resources (AMLR) marine surveys in the area. Finally, we examined the digested portion of the ...
Meeting Document : WG-EMM-03/29 : Auteur(s): W.Z. Trivelpiece (USA), K. Salwicka (Poland) and S.G. Trivelpiece (USA)
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Management and assessment options for the crab fishery around South Georgia
/ Description: A new fishery for the lithodid crab, Paralomis spinosissima, started in Subarea 48.3 in 1992 ... . The fishery is also new to CCAMLR, both in terms of the species and fishing gear. We provide an ... overview of the management options for crab fisheries in general and then consider these options in the ... in addition to the 'size-sex-season' controls. Implementation of both sets of controls ... spinosissima, started in Subarea 48.3 in 1992. The fishery is also new to CCAMLR, both in terms of the species ... and fishing gear. We provide an overview of the management options for crab fisheries in general and ... then consider these options in the context of this crab fishery with specific reference to the ... catch/effort controls in addition to the 'size-sex-season' controls. Implementation of both sets of ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 193–202 : Auteur(s): Basson, M. and D.D. Hoggarth
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Responding to climate change: Adélie penguins confront astronomical and ocean boundaries
Sensors affixed to penguins each year at both Cape Royds and Cape Crozier in 2003-2005. Migrations ... averaged 12,760 km, with the longest being 17,600 km, and were in part facilitated by pack ice movement ... . Trip distances varied annually, but not by colony. Penguins rarely traveled north of the main sea ice ... Sea, a situation that no other Adélie penguin population has had to confront. As sea ice extent in the ...
Meeting Document : WG-EMM-10/P11 : Auteur(s): G. Ballard, V. Toniolo, D.G. Ainley, C.L. Parkinson, K.R. Arrigo and P.N. Trathan
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A balanced model of the food web of the Ross Sea, Antarctica
model has 38 trophic groups and is balanced in terms of annual flows of organic carbon in an average ... recent year (1990–2000). The focus of the model is on the role of Antarctic toothfish in the food web ... ) in trophic flows between groups. Parameters for biomass, production rate, growth efficiency, diet ... changes in biomass, production/biomass and production/consumption parameters were needed to balance the ... distinguished between in this model as the primary concern of this study is middle and upper TL groups. The ... consistency. The model has 38 trophic groups and is balanced in terms of annual flows of organic carbon in an ... average recent year (1990–2000). The focus of the model is on the role of Antarctic toothfish in the food ... magnitude) in trophic flows between groups. Parameters for biomass, production rate, growth efficiency ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 1–31 : Auteur(s): Pinkerton, M.H., J.M. Bradford-Grieve and S.M. Hanchet
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Breeding biology of Adélie penguin (Pygoscelis adeliae) at Edmonson Point CEMP site (Ross Sea, Antarctica): report of the first five years
penguin rookery was studied in terms of colony layout, breeding chronology, foraging trip duration ... the fifth year. The study site was located in the Adélie penguin (Pygoscelis adeliae) colony of ... predators, in this instance the Adélie penguin. It is believed that any such impact will be difficult to ... documentation on colony trends and on breeding biology and showed gender differences in foraging strategies ...
Meeting Document : WG-EMM-99/60 : Auteur(s): S. Olmastroni, S. Corsolini, F. Pezzo, S. Focardi (Italy) and K. Kerry (Australia)
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Analyses of acoustic line-transect data from the waters around South Georgia: estimation of krill (Euphausia superba Dana) – biomass
of zooplankton stocks in the waters around South Georgia was carried out during November and December ... 1981. The data have been analysed using various definitions of strata. The total biomass in the area of ... (Figure 3). 18 transects Each of the nine long transects split in the middle (Figure 4). 6 strata Each ... . Murphy, I. Everson and A. Murray*· Abstract A large-scale acoustic survey of zooplankton stocks in ... been analysed using various definitions of strata. The total biomass in the area of 155 786 km2 was ... . INTRODUCTION Acoustic surveys have become a standard technique in the study of the distribution and ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 225–243 : Auteur(s): Murphy, E., I. Everson and A. Murray
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Updated models of the habitat use of Patagonian toothfish (Dissostichus eleginoides) on the Kerguelen Plateau around Heard Island and the McDonald Islands (Division 58.5.2)
(Dissostichus eleginoides) in the CCAMLR area, with landings of >5000 t.yr-1 from the French EEZ (Division ... toothfish drawn from biological data collected in the HIMI area (Division 58.5.2) on more than 500,000 fish ... quantify the effect of bathymetry in structuring the spatial distribution of different length classes and ... larger fish inhabit deeper waters (>1500m) especially on the eastern part of the Plateau, where the ...
Meeting Document : WG-FSA-14/42 : Auteur(s): C. Péron and D.C. Welsford (Australia)