Search results
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Development of the Southern Ocean Continuous Plankton Recorder survey
to Antarctic waters when the Australian Antarctic Division initiated a survey of the Southern Ocean ... on RSV Aurora Australis south of Australia and west to Mawson. The objectives are to study regional ... patterns, as well as the annual abundance and distribution of krill larvae. The survey covers a large area ... from 60°E to 160°E, and south from about 48°S to the Antarctic coast—an area of more than 14 million ...
Meeting Document : WS-BSO-07/P4 : Author(s): Hosie, G., M. Fukuchi and S. Kawaguchi
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Estimation of natural mortality using catch-at-age and aged mark-recapture data: a simulation study comparing estimation for a model based on the Baranov equations versus a new mortality equation
-recapture data were generated for 12 years of fishing. Two alternative estimation models were programmed in ... R. Both use the same Poisson likelihood for annual number of recaptures by age class, and both model ... the age-structured population for each fishing year by annual recursive use of difference equations ... realistic. In simulation studies of multiple years of releases, both the BODE and CCODE models gave accurate ...
Meeting Document : WG-SAM-10/11 Rev. 1 : Author(s): S.G. Candy (Australia)
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LIFE HISTORY BUFFERING IN ANTARCTIC MAMMALS AND BIRDS AGAINST CHANGING PATTERNS OF CLIMATE AND ENVIRONMENTAL VARIATION
Abstract: The consequences of warming for Antarctic long-lived organisms depend on their ability ... to survive changing patterns of climate and environmental variation. Among birds and mammals of ... and Weddell seals, we found strong support for selection of life history traits that reduce ... survival of adults and in their propensity to breed annually, which are the vital rates that influence most ...
Meeting Document : WG-EMM-08/P05 : Author(s): J. Forcada, P.N. Trathan and E.J. Murphy
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Recent population estimates and trends in numbers of albatrosses and giant petrels breeding at the sub-Antarctic Prince Edward Islands
Abstract: The second mid-summer survey of surface-nesting seabirds at the Prince Edward Island ... Edward Island, mirroring a decrease of roughly 2% per year at Marion Island from 1998 to 2005, a decline ... that has since reversed. Numbers of grey-headed albatrosses Thalassarche chrysostoma on Marion Island ... (3% per year). The estimate of Indian yellow-nosed albatrosses T. carteri at Prince Edward Island was ...
Meeting Document : WG-EMM-10/P04 : Author(s): P.G. Ryan, M.G.W. Jones, B.M. Dyer, L. Upfold and R.J.M. Crawford
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Broadbandwidth total target strength measurements of Antarctic krill (Euphausia superba) from reverberation in a cavity
Abstract: Total scattering cross-sections (st) of Antarctic krill, Euphausia superba, were ... strengths (??10log(??4?) t TTS), were measured from groups of 57 to 1169 krill (average standard length ... omnidirectional emitter into one of three glass carboys containing groups of krill swimming in 9.3, 19.3 or 45.9 l ... of seawater (0.6??temperature??3.6 °C). Between each pulse, the krill moved within the fixed-boundary ...
Meeting Document : WG-EMM-02/49 : Author(s): D.A. Demer and S. G. Conti (USA)
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High densities of pterobranchs and sea pens encountered at sites in the South Orkney Islands (Subarea 48.2): two potential VMEs
Abstract: High densities of pterobranchs (Phylum Hemichordata: Class Pterobranchia) and sea pens ... encountered at sites on the shelf of the eastern South Orkney Islands. The details of these encounters ... , utilizing occurrence and abundance in bottom trawl catches, are provided. The distributions of standardized ... densities for these taxa reveal at least one station location for each taxa with anomalously high levels of ...
Meeting Document : WG-EMM-10/14 : Author(s): S.J. Lockhart and C.D. Jones (USA)
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Abundance of Patagonian toothfish (D. eleginoides) at Macquarie Island estimated from tagging studies during 1995/96 fishing season
presents an analysis of a tag-recapture experiment carried during the Macquarie Island fishery for this ... the tags being released at various times throughout the season, and the effects of the removals by ... obtained for the pre-fishing abundance of the population in the season of 996 000 fish. However, this is ... adjusted to 901 000 fish if a small number of recovered but unreported tags are taken into account. Author ...
Meeting Document : WG-FSA-96/39 : Author(s): de la Mare, W., Williams, R.
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An iterative model to construct an age-length key to assess the age composition of a new fishery for Dissostichus eleginoides in Chilean waters
Abstract: Traditional calculation of catch age composition estimate requires that the age-length ... is capable of providing biased estimates of age distribution. By using the iteration algorithm is ... with the aplication of a single age-length key to all monthly length distribution using the nonlinear ... different from the one obteined by use of traditional method Author(s): H. Robotham V. and Z. Young U ...
Meeting Document : WG-FSA-92/23 Rev. 1 : Author(s): H. Robotham V. and Z. Young U. (Chile)
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On interim distribution of the trigger level in the fishery for Euphausia superba in Statistical Subareas 48.1, 48.2, 48.3 and 48.4
Abstract: Taking into account the practice and current state of krill fishery in Area 48, Ukraine ... proposed to upgrade the Conservation Measure 51-07 in order to redistribute the trigger level of catch in ... additional precautional measures to avoid interceptance of krill fishery and preadors consumption needs ... establishing season limitations of close to shore fishery. New revision will still enable to follow the ...
Meeting Document : WG-EMM-16/56 : Author(s): G. Milinevskyi and K. Demianenko
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Differences in distribution and population structure of krill (Euphausia superba) between penguin and fur seal foraging areas near Seal Island
areas of krill (≥250g/m2) were rather limited. In contrast, fur sea! foraging areas were formed in ... . 2-3 km in horizontal distance) of higher densities (≥250g/m2). In the inshore foraging areas krill ... vertical migration, staying close to the surface throughout the day. As for body size and maturity of krill ... , in the inshore foraging areas middle-sized krill (modal length 43 mm), which consisted mainly of ...
Meeting Document : WG-KRILL-92/27 : Author(s): T. Ichii, H. Ishii (Japan), J.L. Bengtson, P. Boveng, J.K. Jansen (USA) and M. Naganobu (Japan)