Resultados de la búsqueda

1. Interannual variability of krill, salp and other zooplankton populations in the South Shetland Island area during Austral summer 1993–1998

   ". The 4-5 year periodicity of "salp years" over the past fifteen years is discussed with ... recruitment from the past two years. Unusually small juvenile krill in 1998 suggested that survival success ... regimes identified here as "cope pod years", "salp years" and "transition periods ... during the 1993 "salp year". The magnitude of this salp bloom may have resulted from a large ...

   Meeting Document : WG-EMM-98/50 : Autor(es): V. Loeb, W. Armstrong, R. Hewitt (USA) and V. Siegel (Germany)

2. Estimates of the tag loss rates for single and double tagged toothfish (Dissostichus mawsoni) fishery in the Ross Sea

   tagged fish having at least one tag remaining after one year at liberty; 98.9% after two years at liberty ... ; declining to 94.6% after six years; and to 88.4% after ten years. Comparison of the different loss rate ... periods of up to six years at liberty. The loss rate for double tags had been incorrectly derived and ... -estimated for double tagged fish in the first four years and under-estimated after that. However, the tag ...

   Meeting Document : WG-SAM-11/18 : Autor(es): A. Dunn, M.H. Smith (New Zealand), D.J. Agnew (UK) and S. Mormede (New Zealand)

3. A method for spreading the risk of localised effects of catches of Antarctic krill up to the trigger level, during the development of stage 2 of feedback management

   the implementation of Article II of the Convention, taking into account the resource requirements of ...

   Meeting Document : WG-EMM-16/69 : Autor(es): A.J. Constable, S. Kawaguchi and M. Sumner

4. Do the males of Dissostichus eleginoides grow faster, or only mature before females?

   concluded that the males mature for the first time at 4 years age and females at 10 years age, reaching 100 ... % maturity at 12 years age the males and 21 years age the females. Author(s):  C.A. Moreno (Chile) Title:  Do ...

   Meeting Document : WG-FSA-98/16 Rev. 1 : Autor(es): C.A. Moreno (Chile)

5. Climate change and zooplankton dominance in the Antarctic marine ecosystem: implications for the food web

   has been warming over the past 40 years with an associated decreased frequency of winters with ... population dynamics of salps (Salpa thompsoni). Strong krill recruitment success there follows years of ... years suggests that the food web may be affected by climate change. The 1994/95 austral summer season ... followed the first prolonged winter sea-ice season in three years and provides a strong contrast to the ...

   Meeting Document : WG-EMM-96/21 : Autor(es): Siegel, V., Fraser, W., Trivelpiece, S., Holm-Hansen, O., Loeb, V., Hewitt, R., Trivelpiece, W.

6. Population change in gentoo penguins Pygoscelis papua at South Georgia: potential roles of adult survival, recruitment and deferred breeding

   one year, and for part of the differences in two other years, when mortality rates must also have been ... variations introduced by good and bad years (as classified on the basis of breeding success). There is ... generally good agreement between observed and predicted breeding populations, except in four years, when ... years were associated with reduced availability of krill, one with very cold winter and spring ...

   Meeting Document : WG-CEMP-93/08 : Autor(es): J.P. Croxall and P. Rothery (United Kingdom)

7. Southern right whale (Eubalaena australis) reproductive success is influenced by krill (Euphausia superba) density and climate

   correlations were found with krill densities (r = 0.69, p = 0.002, lag 0 years), Oceanic Niño Index (r = −0.65 ... , p = 0.03, lag 6 years), Antarctic Oscillation (r = 0.76, p = 0.01, lag 7 years) and Antarctic sea ... ice area (r = −0.68, p = 0.002, lag 0 years). Our results suggest that global climate indices ... ) availability for the species. Therefore, increased frequency of years with reduced krill abundance, due to ...

   Meeting Document : WG-EMM-16/P06 : Autor(es): E. Seyboth, K.R. Groch, L. Dalla Rosa, K. Reid, P.A.C. Flores and E.R. Secchi

8. Investigation of the sensitivity of the Ross Sea toothfish assessment to withholding subsets of the available data

   model outputs of withholding from a stock assessment between one and eight years of age frequency and/or ... time as more years’ data becomes available. The 2009 stock assessment of Antarctic toothfish in the ... estimated by the models arising from withholding data was found to be highest in the earlier years of stock ... years, the change in estimated biomass arising from withholding data was much smaller, with values ...

   Meeting Document : WG-SAM-11/17 : Autor(es): S. Mormede (New Zealand)

9. Using stationary acoustic platforms to assess precision and accuracy of acoustical krill surveys

   a depth of ~20 m during daytime, while 24 % was found above ~20 m during night. A swarm detection ... approach suggested a similar pattern, 7 % of aggregated backscatter was found above ~20 m during daytime ...

   Meeting Document : WG-EMM-2019/32 : Autor(es): T. Klevjer, G. Skaret and B.A. Krafft

10. Dynamics of Notothenia rossii rossii size-age structure on the Kerguelen Islands shelf

    used to characterise the age composition. It was determined that in the initial years of exploitation ... catches and in some years (1981-1985) fisheries were based practically on recruitment. After the closure ... . In May-June 1991 the mean length was 59.2 cm, mean age was 7.4 years; some 70% of catch consisted of ... that observed in the initial years of exploitation and further closure of marbled rockcod specialised ...

    Meeting Document : WG-FSA-94/04 : Autor(es): P.B. Tankevich (Ukraine)

Páginas