Résultats de la recherche
-
Extension to the krill-predator modelling exercise
krill harvesting is found to be strongly dependent on the estimate of the maximum annual growth rate (R ... ) which the population can achieve. For R=10%, it is estimated that a krill harvesting intensity rate γ of ... slightly more than 0.1 would be required to reduce the seal population to half its pre-exploitation level ... -related mortality effects from overall survival rate data before they can be taken further. Author(s ...
Meeting Document : WG-EMM-96/67 : Auteur(s): Thomson, R.B., Butterworth, D.S.
-
Southern elephant seals and CCAMLR
been recently confirmed for the Macquarie Island stock. The availability of food, competition with ... rapidly growing fur seal populations and competition with fishing fleets have all been suggested as ... possible causes of the elephant seal’s decline in the region. Such explanations assume that a communal ... feeding ground, not yet identified, exists and that this exerts some common influence on the species ... (50 000 km2 ) was estimated to be in excess of 230 000 t and with a maximum sustainable yield (MSY ... , cephalopods and euphausiids may be competing with the declining elephant seal population, especially with ... may mingle in winter. Also, it can be hypothesized that large sized - 471 - elephant seals, i.e ... ) of 80 000 t per annum compared with recently suggested standing stock of only 130 000 t and a MSY ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 465-473 : Auteur(s): Bester, M.N. and D.G.M. Miller
-
Long term movements and activity patterns of an Antarctic marine apex predator: the leopard seal
Abstract: Leopard seals are an important Antarctic apex predator that can affect marine ... island of South Georgia. It appears that these tracked animals migrate in a directed manner towards Bird ... shallow shelf water and regions of sea ice. Wet and dry sensors revealed that seals hauled out for between ... 22 and 31% of the time with maximum of 74 hours and a median of between 9 and 11 hours. The longest ...
Meeting Document : WG-EMM-18/P09 : Auteur(s): I.J. Staniland, N. Ratcliffe, P.N. Trathan and J. Forcada
-
Biotopic and spatial distribution of krill Euphausia superba Dana (Crustacea, Euphausiacea) length groupings in the Atlantic sector of Antarctic in summer 1984 and 1988
Abstract: Three basic length groupings of krill were identified with the clustering analysis on ... in summer 1984 and 1988. The large-length grouping is biotopically associated with the waters of the ... grouping are associated with the Weddell Sea waters. Besides, the additional fourth grouping with bimodal ... length structure was revealed in the survey 1988. It is assumed that the first grouping is transported ...
Meeting Document : WG-EMM-04/27 : Auteur(s): V.V. Lidvanov, A.V. Zimin, K.E. Shulgovsky (Russia)
-
Modeling the growth dynamics of Antarctic krill
that were consistent with observations of experimentally starved individuals. the annual change in ... in the current literature. The model was forced with an environmental time series of food (pelagic ... phytoplankton concentration) that was derived from data sets collected west of the Antarctic Peninsula. Three ... time series were created to represent high, low, and intermediate food conditions with the high and low ...
Meeting Document : WG-EMM-96/68 : Auteur(s): Lascara, C.M., Hofmann, E.E.
-
Population and survival trends of wandering albatrosses (Diomedea exulans) breeding on Macquarie Island
with information from an intensive demographic study conducted between 1994 and 2003. Annual breeding ... effort and survival varied markedly with breeding numbers declining from a peak in 1964 to near ... and, to a lesser extent, adult survival. These survival changes were coincident with changes in ... . Trends in population numbers and survival are similar to that observed in other populations in the Indian ...
Meeting Document : WG-FSA-04/50 : Auteur(s): A. Terauds, R. Gales, R. Alderman and G.B. Baker (Australia)
-
Preliminary assessment of Patagonian toothfish in Subarea 48.3
terminal assessment year continues to be estimated at around 54% of virgin biomass, consistent with the ... outputs from the 2-fleet and 3-fleet assessments are very similar with the exception of the ... and require further investigation. Yield calculations have yet to be completed. Author(s): R. Scott ...
Meeting Document : WG-FSA-13/30 : Auteur(s): R. Scott (United Kingdom)
-
Model diagnostics for the Antarctic krill assessment for Subarea 48.1
populations (Ziegler et al., 2015; SC-CAMLR-XXXIV/05, Appendix D). Similar diagnostics can be applied to any ... ; configuration of the krill model was presented to EMM in 2015 (Kinzey et al. 2015a) along with seven alternative ... description of the base case and differently-weighted configurations with a table of likelihood components for ... parameters will also be provided. Author(s): D. Kinzey, G.M. Watters and C.S. Reiss (USA) Title: Model ...
Meeting Document : WG-FSA-15/60 : Auteur(s): D. Kinzey, G.M. Watters and C.S. Reiss (USA)
-
Features of chronology and breeding success of Pygoscelis papua and Pygoscelis adeliae penguins in the Wilhelm Archipelago (CCAMLR Subarea 48.1)
of the Wilhelm Archipelago. It was observed that at the beginning of the ХХІ century the nesting ... shown that P. papua is more ecologically plastic species than P. adeliae. Well-known that the ... breeding success of penguins can be used as an indication of the status of lower trophic levels. Future ... results of the gentoo and Adelie penguin’s chronology and breeding success studies might be used in the ...
Meeting Document : WG-EMM-18/P13 : Auteur(s): I.V. Dykyy, G.P. Milinevsky, O.L. Savitsky, D.G. Lutsenko, P.B. Khoetsky, M.F. Veselsky, V.M. Smagol, A.O. Dzhulay, J.V. Tsaryk, K.M. Nazaruk, A.T. Zatushevsky, A.O. Simon and M.A. Telipska
-
Seal mitigation measures on trawl vessels fishing for krill in CCAMLR Subarea 48.3
krill fishery around South Georgia, and on mitigation methods that were being developed and deployed to ... avoid fur seal deaths in the fishery. WG-EMM requested that the UK provide further details of the ... mitigation methods that were being developed and deployed to avoid fur seal deaths in the fi shery. WG-EMM ... requested that the UK provide further details of the methods employed for consideration by the ad hoc ... ) in the krill fi shery around South Georgia, and on mitigation methods that were being developed and ... . Mitigation measures Atlantic Navigator The Atlantic Navigator was equipped with a seal- exclusion device ...
Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 195–205 : Auteur(s): Hooper, J., J.M. Clark, C. Charman and D. Agnew