Resultados de la búsqueda
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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
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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)
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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
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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)
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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)
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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)
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Growth of Antarctic krill Euphausia superba at South Georgia
Abstract: Antarctic krill Euphausia superba has a central role in the ecosystem of the Southern ... dynamics. The length of Antarctic krill in the diet of Antarctic fur seals Arctocephalus gazella at South ... Antarctic Peninsula region. The effect of geographical variation in growth rate on the population structure ... in the interpretation of krill life cycles. Author(s): K. Reid (United Kingdom) Title: Growth of ...
Meeting Document : WG-EMM-01/18 : Autor(es): K. Reid (United Kingdom)
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Distribution of fish larvae at South Georgia: horizontal, vertical, and temporal distribution and early life history relevant to monitoring year-class strength and recruitment
abundant near the coast, but rare in oceanic waters. During winter in the 265 m deep fiord of Cumberland ... East Bay the early stages of many species were found throughout the water column. In summer only four ... species of larvae were abundant, they were found in the upper 100 m of the water column, especially the ... . The findings are discussed in relation to surveys for sampling the early stages of fish at South ... the early life history stages of Antarctic fish at South Georgia are reported. In winter and summer ... , but rare in oceanic waters. During winter in the 265 m deep fiord of Cumberland East Bay the early ... stages of many species were found throughout the water column. In summer only four species of larvae ... were abundant, they were found in the upper 100 m of the water column, especially the top 2 m layer ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 105-141 : Autor(es): North, A.W.
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Proposals on standardization of toothfish resource research
discussed in the context of discussion at the Scientific Committee and the CCAMLR Commission in 2018 ... regarding the longline survey methodology in Division 58.4.1. It is shown that the methodology of modern ... mandatory for all ships participating in the survey. At the same time, methodological aspects of the multi ... -year international research program implemented in Subdivision 58.4.1., such as the lack of ...
Meeting Document : WG-SAM-2019/34 : Autor(es): S. Kasatkina
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Distribution and population structure of Dissostichus eleginoides and D. mawsoni on BANZARE Bank (CCAMLR Division 58.4.3b), Indian Ocean, Antarctic
mainly caught in the deeper slope >1500 m. The separation of the two species by depths may be related ... species. The mean total length (TL) of females was significantly larger than that of males for both ... fishing season. D. eleginoides was mainly caught in the shallower bank <1000 m, while D. mawsoni was ... to the physical intolerance to the cooler temperature by the lack of antifreeze for the former ...
Meeting Document : WG-FSA-10/47 : Autor(es): K. Taki, M. Kiyota, T. Ichii and T. Iwami (Japan)