Resultados de la búsqueda
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Shipboard line transect surveys of crabeater seal abundance in the pack-ice off East Antarctica: evaluation of assumptions
Abstract: The extent to which the assumptions underlying line transect sampling are satisfied in ... shipboard surveys of crabeater seals hauled-out on the Antarctic pack-ice is examined. Crabeater seals ... showed little movement in response to the approaching ship. Movement away from the ship by seals close to ... the ship’s track was partially responsible for a relative lack of sightings close to the transect-line ...
Meeting Document : WG-EMM-04/64 : Autor(es): C. Southwell, W. de la Mare (Australia), D. Borchers and L. Burt (United Kingdom)
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Relationship between Antarctic krill (Euphausia superba) variability and westerly fluctuations and ozone depletion in the Antarctic Peninsula area
Abstract: An assessment of the environmental processes influencing variability in the recruitment ... affects the Antarctic marine ecosystem as a whole. We have assessed variability in krill recruitment and ... ) determined from sea level pressure differences across the Drake Passage, sea ice cover, and ozone depletion ... . We found a significant positive correlation between krill recruitment in the Antarctic Peninsula area ...
Meeting Document : WG-EMM-99/52 : Autor(es): M. Naganobu, K. Kutsuwada, Y. Sasai and T. Taguchi (Japan) and V. Siegel (Germany)
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Diet and foraging effort of Adélie penguins in relation to pack-ice conditions in the southern Ross Sea
Abstract: We investigated the diet and aspects of foraging effort among Adélie Penguins ... Pygoscelis adeliae breeding at three colonies on Ross Island, in the southwestern Ross Sea-- Capes Royds ... , Bird and Crozier-- during the chick provisioning period of three austral summers, 1994-95, 1995-96 and ... 1996-97. During the study period, pack-ice cover differed in waters offshore of these colonies, by ...
Meeting Document : WG-EMM-98/15 : Autor(es): D.G. Ainley (USA), P.R. Wilson, K.J. Barton (New Zealand), G. Ballard, N. Nur (USA) and B. Karl (New Zealand)
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TIMING OF CLUTCH INITIATION IN PYGOSCELIS PENGUINS ON THE ANTARCTIC PENINSULA: TOWARDS AN IMPROVED UNDERSTANDING OF OFF-PEAK CENSUS CORRECTION FACTORS
Abstract: Penguin censuses on the Antarctic Peninsula are often subject to logistical challenges ... that preclude nest censuses being conducted at the peak of egg laying as established by the CCAMLR ... Ecosystem Monitoring Program (CEMP) (Scientific Committee for the Conservation of Antarctic Marine Living ... Resources 2004). Additionally, the historical literature, necessary for establishing baseline conditions ...
Meeting Document : WG-EMM-PSW-08/15 : Autor(es): H.J. Lynch, W.F. Fagan, R. Naveen, S.G. Trivelpiece and W.Z. Trivelpiece (USA)
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DOWN-SCALING FOOSA TO MODEL THE ADMIRALTY BAY PYGOSCELID PENGUIN COLONIES: A WORK IN PROGRESS
Abstract: We apply Foosa at the scale of interactions among the 3 breeding penguin colonies ... , krill, and environmental variability at the long-term research site in Admiralty Bay, King George Island ... -fitting framework for the purpose of model validation, and 2) to add and explore functionality in Foosa to ... that Foosa capably captures the general trends in adult abundance at Admiralty Bay with minimal formal ...
Meeting Document : WG-EMM-08/51 : Autor(es): J.T. Hinke, G.M. Watters and W.Z. Trivelpiece (USA)
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An assessment of longlining operations for Dissostichus eleginoides on board the Chilean-registered longliner BF Cisne Verde during March–May 1997 around South Georgia (Subarea 48.3)
night using the Spanish double-line method with extra weights on the line and all deck-lights ... sampling method; the known number of coils laid during a night's setting operations provided the ... sampling frame, and the sampling units consisted of lengths of line between marked connecting lines ... target of 60 fish/day. The method was further developed to integrate different, and varying, levels of ...
Meeting Document : WG-FSA-97/41 : Autor(es): Ashford, J.R., Everson, I.
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Potential impacts of climate change on the Southern Ocean ecosystem
Abstract: Global climate change has the potential to disrupt the delicately poised themal balance ... in surface waters of the Southern Ocean around Antarctica, threatening this highly productive system ... with severe and permanant collapse. Pivotal to this process is a diminution of the important (but ... little studied) CO2 sink in the Southern Ocean, resulting in a series of feedback loops accelerating ...
Meeting Document : CCAMLR-VIII/BG/21 : Autor(es): R.G. Chittleborough (Australia)
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Influence of tag numbers, size of tagged fish, duration of the tagging program, and auxiliary data on bias and precision of an integrated stock assessment
collection, this study investigated how the bias and precision of a CASAL assessment is influenced by various ... aspects of a tagging program, in particular the effects of the numbers of fish tagged, the duration of a ... tagging program, the size of tagged fish, and the type of auxiliary data used in the assessment. The ... numbers were important particularly in the early stages of an exploratory fishery to ensure some ...
Meeting Document : WG-SAM-12/24 : Autor(es): P.E. Ziegler (Australia)
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Testing for genetic differentiation between two size classes of the starry skate (Amblyraja georgiana)
in the catch data from the Ross Sea fisheries. We extracted DNA from A. georgiana samples from both ... size classes collected by Scientific Observers in the Ross Sea. We determined the DNA sequences of five ... mitochondrial DNA (mtDNA) gene sequences and tested whether the two size classes represented genetically ... among the samples of A. georgiana that were collected in the Ross Sea region, and the data did not ...
Meeting Document : WG-FSA-12/53 : Autor(es): P. Ritchie and A. Fleming (New Zealand)
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Skate tagging in the Heard Island and McDonald Island (Division 58.5.2) toothfish fishery up to 2013
Abstract: The fisheries targeting Patagonian toothfish (Dissostichus eleginoides) and mackerel ... icefish (Champsocephalus gunnari) in the Australian Fishing Zone surrounding Heard Island and McDonald ... bycatches. A tagging program has operated in these fisheries since 2001 to learn more about the movement and ... biology of these species. In the 13 years, over 12,000 skates have been tagged, with 112 recaptures, a ...
Meeting Document : WG-FSA-13/22 : Autor(es): G.B. Nowara, T.D. Lamb and D.C. Welsford (Australia)