Resultados de la búsqueda
-
IMPACTS OF CLIMATE CHANGE ON ANTARCTIC MARINE ECOSYSTEMS: A CALL FOR ACTION
decade, but little in the way of policy or operational change has resulted at CCAMLR. Over the past 50 ... ice. "The uncertainty in climate predictions leads to uncertainty in projections of impacts, but ... Committee needs to increase its work on climate change impacts in order to consider the consequences of a ... approach to management in the context of the unknowns of climate change, and to include in this approach ...
Meeting Document : CCAMLR-XXVII/BG/27 : Autor(es): Submitted by ASOC
-
An index of per capita recruitment
)eM where R1 is the proportion of age-1 animals sampled in year y and M is the post-recruit mortality ... the population is available; and 4) the proportion of age-1 animals in the sample can be determined ... assumed in order to investigate the resulting distributions of PCR. Distributions of PCR are skewed toward ... conclusions are insensitive to changes in the shape of the functional relationship between spawners and ...
Meeting Document : WG-EMM-99/50 : Autor(es): R. Hewitt (USA)
-
NET-BASED VERIFICATION OF ACOUSTIC TECHNIQUES USED TO IDENTIFY ANTARCTIC KRILL
model derived target id window only identified krill in 6 of the 16 nets correctly. The ‘2 freq 2-16 ... ’ algorithm attributed more than 90 % of the total backscatter to krill in all but 1 aggregation with the ‘2 ... krill in 12 out of the 16 nets. The ‘2 freq 2 – 12’ window only attributed more than 90 % of the total ... backscatter to krill in 6 nets while the ‘3 freq model’ attributed only just greater than 50 % of the ...
Meeting Document : WG-EMM-08/54 : Autor(es): J. Watkins and S. Fielding (United Kingdom)
-
Detailed distribution of krill fishing around South Georgia
only been available to the scientific community in the form of sub-area or fine-scale(0.5 ° latitude by ... has operated they do not reveal the localised nature of the fishing operation. In particular they give ... available from August but the fishery was restricted in that period to an area on the western edge of the ... Abstract: The distribution of kri!! harvesting effort and associated catch rates has previously ...
Meeting Document : WG-EMM-96/64 : Autor(es): Parkes, G., Everson, I., Trathan, P.N., Murphy, E.J.
-
Influence of krill availability on humpback whale breeding success
Abstract: The abundance of the Antarctic krill (Euphausia superba) has been declining in the ... survival) of the krill consumers may be compromised. In the present study, we investigated the reproductive ... frequency of extreme El Niño events may compromise humpback whale’s rate of recovery in the Southern ... western Antarctic Peninsula (WAP), probably as a consequence of the effects of the considerable increase ...
Meeting Document : WG-EMM-18/P15 : Autor(es): E. Seyboth, F. Félix, M.-A. Lea, L. Dalla Rosa, G. Watters, K. Reid and E. Secchi
-
Target strengths of krill at 136 and 20 kHz
lengths in the range (45,50) mm the mean single-krill target strengths are in the range (-68,-69) dB at ... 136 kHz. For aggregations with mean lengths in the range (43,47)mm the mean single-krill target ... strengths are in the range (-71,-77) dB at 20 kHz. Trawling-acoustic method. For aggregations with mean ... lengths in the range (47,50) mm the mean target strengths in the range (-71,-75) dB at 20 kHz were ...
Meeting Document : WG-KRILL-91/29 : Autor(es): S.M. Kasatkina (USSR)
-
Age validation of juvenile Notothenia rossii at Potter Cove, South Shetland Islands, using mark-recapture data
agreement with the known pattern of growth in summer. Likewise, an analysis in selected specimens showed ... good consistency between the numbers of sclerites deposited in scales and the time of fish release. The ... simultaneous counting of the annuli with complete correspondence.The growth in length of fish ranged from 0.5 ... Abstract: Among all validation methods of age determination in fish, release of known age and ...
Meeting Document : WG-FSA-13/P01 : Autor(es): E. Moreira, E. Barrera-Oro and M. La Mesa
-
Review of some assumptions for modelling Patagonian toothfish dynamics at CCAMLR Subarea 48.3
cases were similar, there were considerable differences in assumptions and implementations of the two ... relationship is also analyzed, in relation with the current underlying assumption of fish stock resilience ... Abstract: During the year 2005 meeting of the WG-FSA two different methods for assessing ... Patagonian toothfish stock in CCAMLR Subarea 48.3 were available to the Working Group: CASAL and ASPM (WG-FSA ...
Meeting Document : WG-FSA-SAM-06/13 : Autor(es): A. Aubone, P.A. Martínez and O.C. Wöhler (Argentina)
-
Population of macaroni penguins Eudyptes chrysolophus at Marion Island, 1994/95 to 2002/03, with information on breeding and diet
demonstration of a significant decrease in the overall population. Numbers of occupied nests at other colonies ... correlated. Both showed a marked decrease in 1998/99, after the El Niño of 1997/98. In most seasons from 1994 ... subantarctic Marion Island have decreased since the early 1980s. Estimates of the population at the island fell ... large colonies, at Bullard Beach and Kildalkey Bay, account for about 85% of the overall population. At ...
Meeting Document : WG-EMM-03/15 : Autor(es): R.J.M. Crawford, J. Cooper and B.M. Dyer (South Africa)
-
Trends of Antarctic fur seal population at SSSI No. 32, Livingston Island, South Shetlands, Antarctica
had to model the population at the latter site, in order to have a complete estimate of the population ... . From this, we estimated an overall increase of 17% in the total population, including in this figure a ... Abstract: We update in this paper the previously reported model for the Antarctic fur seal ... , South Shetland, Antarctica. We also discuss the current reliability of the model and related population ...
Meeting Document : WG-EMM-99/16 : Autor(es): R. Hucke-Gaete, D. Torres, A. Aguayo, J. Acevedo and V. Vallejos (Chile)