Search results
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VARIABILITY IN KRILL BIOMASS LINKS HARVESTING AND CLIMATE WARMING TO PENGUIN POPULATION CHANGES IN ANTARCTICA
areas on the planet, with 5–6 °C increases in mean winter air temperatures and associated decreases in ... . One hypothesis guiding ecological interpretations of changes in top predator populations in this ... region, the “sea-ice hypothesis,” proposes that reductions in winter sea ice have led directly to ... declines in “ice-loving” species by decreasing their winter habitat, while populations of “ice-avoiding ...
Meeting Document : WG-EMM-11/P1 : Author(s): W.Z. Trivelpiece, J.T. Hinke, A.K. Miller, C.S. Reiss, S.G. Trivelpiece and G.M. Watters
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Natural fluctuations in the abundance of krill with due regard to global climate changes in the southern hemisphere: forecasting possibilities
Abstract: The eco systematic studies in biology and hydrology conducted in the Atlantic sector of ... the South Ocean in recent years made it possible for scientists to establish a rather clear ... ;success" in the reproduction of krill (Euphausia superba) and salp (Salpa tompsoni) (SC-CAMLR-XVI4 ... al., 1997) and other researches in the Antarctic Peninsula Subarea 48.1 showed good correlation ...
Meeting Document : WG-EMM-98/52 : Author(s): K. Shust (Russia)
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Fisheries in the Southern Ocean – an ecosystem approach. Trans. Roy. Soc. Lond. (in press)
extended to the application of a precautionary approach in the late 1980’s. In our review we deal primarily ... management of the living resources of the Southern Ocean. To assist the Commission in meeting objectives, as ... set out in Article II, 3, the Scientific Committee established the CCAMLR Ecosystem Monitoring Program ... albatrosses, penguins, petrels, fur seals. Fisheries in the Southern Ocean followed the fate of other ...
Meeting Document : SC-CAMLR-XXIV/P01 : Author(s): Kock, K.-H., K. Reid, J. Croxall and S. Nicol
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Characteristics of seasonal variation in diurnal vertical migration and aggregation of Antarctic krill (Euphausia superba) in the Scotia Sea, using the Japanese fishery data
Abstract: We examined seasonal variation in CPUE (catch per volume of trawled water) and diurnal ... fisheries data. Average trawling depth usually showed a marked diurnal change during summer and winter in SS ... did not show such diurnal vertical migration during winter in SG, being deepest around at morning ... twilight and shallowest around at evening twilight. The range of trawling depth was narrower in the certain ...
Meeting Document : WG-EMM-04/44 : Author(s): K. Taki, T. Hayashi and M. Naganobu (Japan)
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An 8-year cycle in krill biomass density inferred from acoustic surveys conducted in the vicinity of the South Shetland Islands during the austral summers of 1991/1992 through 2001/2002
Abstract: Data from single and multi-frequency active acoustic surveys conducted annually in the ... -seasonal variations in krill biomass density and dispersion were derived from the re-processed data set for ... surveys conducted in the austral summers of 1991/1992 through 2001/2002. Estimated biomass density ranged ... from 1 to 60 g m–2, decreasing from mid-range levels in 1991/1992 to a minimum in 1992/1993–1993/1994 ...
Meeting Document : WG-EMM-03/6 : Author(s): R.P. Hewitt, D.A. Demer and J.H. Emery (USA)
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Reports on abundance and biological information of toothfish in Division 58.4.4 a & b by Shinsei maru No. 3 in 2013/14 season
information of toothfish in the research blocks 58.4.4b_1 (SSRU 58.4.4C) and 58.4.4b_2 (SSRU 58.4.4D) of ... trotline system were made in the blocks. Total catch of Dissostichus eleginoides (excluding those tagged ... and released) was 26.6 tonnes in the survey area. Mean CPUEs in terms of weight of D. eleginoides was ... 32.9 kg / km (CV = 11.3%) and 38.3 kg / km (CV = 13.6%) in the blocks 58.4.4b_1 and 58.4.4b_2 ...
Meeting Document : WG-SAM-15/14 : Author(s): Delegation of Japan
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Research plan for toothfish in Division 58.4.4b by Shinsei maru No. 3 in 2014/15
Abstract: In this document, we revise stock status assessments of D. eleginoides in research ... . Detailed results using CASAL models in research block C are described in a separated document. The Shinsei ... maru No. 3 will conduct the research in June for the current (2013/14) season, thus we would submit ... updated data to the next WG-FSA meeting. The estimated stock size in block C was 753, 428 and 667 tonnes ...
Meeting Document : WG-SAM-14/14 : Author(s): Delegation of Japan
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DEVELOPING FOUR PLAUSIBLE PARAMETERISATIONS OF FOOSA (A SO-CALLED REFERENCE SET OF PARAMETERISATIONS) BY CONDITIONING THE MODEL ON A CALENDAR OF EVENTS THAT DESCRIBES CHANGES IN THE ABUNDANCES OF KRILL AND THEIR PREDATORS IN THE SCOTIA SEA
with the agreed calendar, as specified by the WG-SAM, that describes changes in the abundances of krill ... and their predators in the Scotia Sea. First, we compiled a set of base parameterizations from ... information in the literature and following specifications laid out by the WG-SAM. These base ... determines the degrees to which the survival of juvenile predators depends on foraging success in their first ...
Meeting Document : WG-EMM-08/13 : Author(s): G.M. Watters, J.T. Hinke (USA) and S. Hill (United Kingdom)
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Revised research plan for the exploratory fisheries for Dissostichus spp. in Subarea 48.6 in 2014/15
CPUE method (using Division 88.2H as a reference area) for Dissostichus mawsoni in block 486_2. However ... , the estimates using the Petersen estimator were different from those using the CPUE method in other ... ) were relatively consistent with the observed numbers for D. mawsoni in the block 486_2 for 2012/13 and ... Dissostichus spp. in other blocks. As we proposed at the last WG-SAM meeting, since we have yet to obtain ...
Meeting Document : WG-FSA-14/17 : Author(s): Delegation of Japan
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Interaction of sperm whales with bottom longline and the Mammal and Bird Excluding Device (MBED) operation in the Patagonian toothfish (Dissostichus eleginoides) fishery in the southwestern Atlantic
the toothfish fishery (Dissostichus eleginoides) carried out by longline fishing vessels operating in ... two different fishing zones at 40º and 50º latitudes in the Southwestern Atlantic from March to May ... 2007. 62 hauls were performed in the northern zone (latitude 40º 00’ S), while 41 hauls were performed ... in the southern zone (latitude 50º 00’ S) at an average depth of-1282 m. 57.2% of the total number of ...
Meeting Document : WG-FSA-07/23 : Author(s): O. Pin and E. Rojas (Uruguay)