Résultats de la recherche

1. Fishing for toothfish using pots: results of trials undertaken around South Georgia, March–May 2000

   commercial viability of this fishing method for toothfish fisheries in the CCAMLR Convention Area. While the ... toothfish was notably lower than that achieved in the longline fishery. Importantly, the use of pots ... pots with a line length of 5 000 m. During the 112 sets made in the trial period, 150 pots were lost ... . A drawstring held the bottom mesh together in the middle. This allowed pots to be emptied easily ... toothfish fisheries in the CCAMLR Convention Area. While the method successfully caught D. eleglnoidcs ... achieved in the longline fishery. Importantly, the use of pots eliminated bird by- catch. To capitalise on ...

   Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 93–105 : Auteur(s): Agnew, D.J., T.M. Daw, G.M. Pilling and M.G. Purves

2. Sexing of adult Adélie penguins by discriminant analysis of morphometric measurements

   shift). It was found that the combination of flipper breadth, bill depth and length of the middle toe ... (Adelie penguins), Samour et al., 1983 (five species of penguins). In Adelie penguins significant ... differences between sexes was also found in bill size (Ainley et al., 1983). The techniques listed above ... are very useful but during the breeding season they can be applied only after egg-laying. In many ... technique of sex determination in adult, fledgling and yearling Megellanic penguins, Spheniscus ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 543–549 : Auteur(s): Scolaro, J.A., Z.B. Stanganelli, H. Gallelli and D.F. Vergani

3. Beyond MSY: a consideration of definitions of management objectives

   different guidelines under more realistic population models, taking account of the objectives set out in ... and 1960s it served a very useful purpose in bringing an understanding of the broad principles of ... realistic population models, taking account of the objectives set out in Article 11 of the CCAMLR ... comprehension, and reasonable correspondence to the behaviour of resources under exploitation. In the 1950s ... resource management to administrators and industry. In later years it has come under increasing ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 299-322 : Auteur(s): Gulland, J.A.

4. Effects of recruitment variability and natural mortality on generalised yield model projections and the CCAMLR decision rules for Antarctic krill

   proportional recruitment of krill. In this study, krill sampling data for empirical size frequencies were ... . The annual proportions of krill less than 36 mm in length to the total captured in net samples in four ... proportional recruitment in the CCAMLR study areas was similar to the variability in other krill studies and in ... the annual size distributions of krill in penguin diets. Simulations with either no fishing, or with ... Bellingshausen Sea in the West Antarctic Peninsula south to the eastern Subareas 48.1 and 88.3. The South ... The annual catch of Antarctic krill (Euphausia superba) in the Scotia Sea (FAO Statistical Subareas ... potential for additional increases in catch. The total precautionary catch limit of 8.6 million tonnes for ... fishing has occurred mainly in Area 48, where about 28% of the Antarctic krill stock is esti- mated to ...

   Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 81–96 : Auteur(s): Kinzey, D., G. Watters and C.S. Reiss

5. Effects of weather and sea-ice on the reproductive performance of the Adélie penguin at Edmonson Point, Ross Sea

   seasons. Weather and sea-ice regimes varied notably, especially in 2003, which was characterised by ... extensive and persistent sea-ice and strong winds with snowfalls in December. First incubation trips by ... females were significantly longer than in 1999 and 2001, which in turn delayed the mean departure date of ... males on the second incubation trip. A high number of chicks died during the post-hatching stage and the ... November), but mean trip duration varied (F2,309 = 124.80, p < 0.001). In 2003, trips were much longer ... -rearing period compared with the 1999 and 2001 breeding seasons, in which sea-ice conditions and trip ... varied notably, especially in 2003, which was characterised by extensive and persistent sea-ice and ... strong winds with snowfalls in December. First incubation trips by females were signifi cantly longer ...

   Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 99–109 : Auteur(s): Olmastroni, S., F. Pezzo, V. Volpi and S. Focardi

6. On the power to detect changes using the standard methods for monitoring parameters of predatory species

   trip duration (C2.0). The other Standard Methods are not evaluated because the power analysis in the ... considered here are insufficient for conducting power analyses (penguin arrival weight A1.1, trend in penguin ... George Island in the 1981/82 and 1982/83 seasons. The mean trip duration for 37 pairs of Adelie penguins ... changes in trip duration within a season. 382 3.6 Breeding Success (A6.1) The reproductive success ... /Attendance Duration (C2.0) As we discussed above in the section on penguin foraging trip duration, this ... breeding success (A6.1), penguin chick diet (A8.1), and fur seal foraging trip duration (C2.0). The other ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 377–397 : Auteur(s): Boveng, P. and J.L. Bengtson

7. Line weights of constant mass (and sink rates) for Spanish system Patagonian toothfish longline vessels

   with seabirds. The weights typically used are collections of rocks enclosed in netting bags. During ... fishing operations the netting bags abrade on the seabed causing rocks to be lost and the weights to ... the option of substituting steel weights for rock weights while remaining in compliance with the sink ... loss by toothed whales) were tested in the experiment. Spanish-system longlines with 8 kg rock weights ... snag on the seabed, potentially reducing the amount of gear lost in benthic habitats. This paper ... ) which lies in the eastern junction of the Beagle Channel and the South Atlantic Ocean. The vessel was ... the seabed and the amount of gear lost in benthic habitats. By virtue of their faster sink rates it ... collections of rocks enclosed in netting bags. During fishing operations the netting bags abrade on the ...

   Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 93–106 : Auteur(s): Robertson, G., C.A. Moreno, E. Gutiérrez, S.G. Candy, E.F. Melvin and J.P. Seco Pon

8. Reproductive performance of seabirds and seals at South Georgia and Signy Island, South Orkney Islands, 1976-1987: implications for Southern Ocean monitoring studies

   reviewed. Breeding success of the wandering albatross, which breeds in winter and eats fish and squid, has ... South Georgia, which breed in summer and feed extensively on krill, have shown major fluctuations in ... some or all of breeding population size, breeding success, foraging trip duration and offspring growth ... fluctuations in reproductive performance of the krill-eating, summer-breeding penguins at Signy Island are not ... breeds in winter and eats fish and squid, has remained constant, while population size has declined ... gradually but significantly. The other species at South Georgia, which breed in summer and feed ... extensively on krill, have shown major fluctuations in some or all of : breeding population size, breeding ... success, foraging trip duration and offspring growth rate. 1977-78 and 1983-84 were summers of ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 445-447 : Auteur(s): Croxall, J.P., T.S. McCann, P.A. Prince and P. Rothery

9. Validation of sink rates of longlines measured using two different methods

   sight behind waves or in congregations of seabirds before the target depth was reached. No TDRs were ... lost during the trial. Bottle tests were most useful, depending on sea state and weather conditions ... during line setting, or bottles vanishing from sight behind waves or in congregations of seabirds ... before the target depth was reached. No TDRs were lost during the trial. Bottle tests were most useful ... and Robertson 180 Introduction In the search for mitigation measures that reduce or even eliminate ... seabird mortality in demersal longline fi shing operations, the sink rate of the longlines was identifi ...

   Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 179–187 : Auteur(s): Wienecke, B. and G. Robertson

10. Breeding numbers and success of Eudyptes penguins at Marion Island, and the influence of mass and time of arrival of adults

    , there was substantial correlation in the numbers of adults breeding at study colonies of macaroni ... penguins (Eudyptes chrysolophus) over 26 years, as there was also for eastern rockhopper (E. chrysocome ... conditions may also affect breeding success. Trends in breeding success between study colonies were more ... Oscillation event of 1997/98, there was no significant correlation in mass on arrival between the two species ... . 2003b. Decrease in numbers of the eastern rockhopper penguin Eudyptes chrysocome filholi at Marion ... was substantial correlation in the numbers of adults breeding at study colonies of macaroni penguins ... (Eudyptes chrysolophus) over 26 years, as there was also for eastern rockhopper (E. chrysocome filholi ... conditions may also affect breeding success. Trends in breeding success between study colonies were more ...

    Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 175–190 : Auteur(s): Crawford, R.J.M., B.M. Dyer, J. Cooper and L.G. Underhill

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