Résultats de la recherche

1. 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.

2. 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.

3. 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.

4. 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)

5. 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)

6. 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)

7. The State of Exploited Fish Stocks in the Atlantic Sector of the Southern Ocean in 1988

   of the 1960s by the Soviet Union mainly. Notothenia rossii marmorata was the target species in the ... 1986-88. N. rossii marmorat is the species mostly affected by the fishery. Stock size around South ... depleted by the fishery and are in need for conservation measures. P. br. guntheri is the only species for ...

   Meeting Document : WG-FSA-88/14 : Auteur(s): K.-H. Kock and F.-W. Köster (FRG)

8. Ocean acidification and the Southern Ocean

   assumes “business as usual”- emissions leading to 778 ppm of CO2 in the atmosphere by 2100- aragonite will ... , which assumes that atmospheric CO2 will only reach 563 ppm by 2100, the aragonite saturation horizon is ... likely to have shrunk from 730 to 60 m by 2100, with the entire Weddell Sea undersaturated with respect ...

   Meeting Document : CCAMLR-XXIX/BG/24 : Auteur(s): ASOC Observer

9. Linking predator and prey behaviour: contrasts between Antarctic fur seals and macaroni penguins at South Georgia

   highest proportion of fish in over 20 years of routine monitoring (46% by mass; particularly the myctophid ... constrained by the need to return and feed their offspring both predator species foraged to the northwest of ... more successful at exploiting krill. When unconstrained by chick-rearing (during March) penguins ...

   Meeting Document : WG-EMM-10/P07 : Auteur(s): C.M. Waluda, M.A. Collins, A.D. Black, I.J. Staniland and P.N. Trathan

10. The relative impacts of Autolines and Spanish longlines on vulnerable marine ecosystems

    several Conservation Measures that limit bottom fishing and require data collection by fishing vessels ... limited.  We used data collected by the longline fishery in Subarea 88.1 to compare the impacts of ... that biased reporting (e.g., under-reporting by vessels using Spanish longlines) would change our ... Autolines and Spanish longlines on VME taxa.  We found that the probabilities of observing positive ...

    Meeting Document : WG-FSA-12/27 : Auteur(s): T. Gerrodette and G. Watters (USA)

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