Search results
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Sexual dimorphism and sexual segregation in foraging strategies of northern giant petrels Macronectes halli during incubation
dimorphism, in terms of the intersexual food competition hypothesis, on foraging and fasting strategies of ... , duration of foraging trips) was greater for females than for males. In contrast, foraging efficiency ... body reserves. In males the total mass gain was best explained by mass at departure and body size. We ... , promoting sexual size dimorphism. Our results indicate that sex-specific differences in fasting endurance ...
Meeting Document : WG-FSA-99/38 : Author(s): J. González-Solís, J.P. Croxall and A.G. Wood (United Kingdom)
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THE DIET OF THE ANTARCTIC TOOTHFISH IN THE ROSS SEA
toothfish, Dissostichus mawsoni, in the Ross Sea. The diet for a sample from McMurdo Sound in the ... macrourid (grenadier or rattail) Macrourus whitsoni dominated the diet at 54% and 37%, respectively. In the ... genera. It can be concluded that D. mawsoni is a generalized piscivorous predator that feeds primarily in ... the water column and occasionally on the substrate. There is variability in the diet within Subarea ...
Meeting Document : WG-EMM-09/16 : Author(s): J.T. Eastman and A.L. DeVries (USA)
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Preliminary examination of otolith microchemistry to determine stock structure in Antarctic toothfish (Dissostichus mawsoni) between SSRU 88.1C and 88.2H
evaluated using otolith microchemistry techniques. Our aims were to (i) determine whether fish from in ... concentrations in the otolith edge and then to (ii) assess the potential of natal signatures to distinguish ... stocks among these regions. For the elements (Mg, Al and Sr) spatial variation in otolith chemistry was ... shown. This resulted in the correct classification of 63% of fish overall to their original capture ...
Meeting Document : WG-SAM-14/33 : Author(s): R. Tana, B.J. Hicks, C. Pilditch and S.M. Hanchet (New Zealand)
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Development of foraging behaviour and evidence of extended parental care in the gentoo penguin (Pygoscelis papua)
approximately 2500 breeding pairs of gentoo penguins in Admiralty Bay, King George Island, South Shetland ... with extended parental provisioning, behaviours not observed in other Pygoscelis species. Chicks took ... adult foraging trips in both timing and duration. Behavioural observations confirmed that many chicks ... in the late afternoon to evening hours. We hypothesize that these behaviours not only provide the ...
Meeting Document : WG-EMM-06/8 : Author(s): M. Polito and W.Z. Trivelpiece (USA)
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SPATIAL DISTRIBUTION AND AGE STRUCTURE OF THE ANTARCTIC TOOTHFISH (DISSOSTICHUS MAWSONI) IN THE ROSS SEA, ANTARCTICA
toothfish (Dissostichus mawsoni) are subject to an increasingly important commercial fishery in the Ross Sea ... -line fishery in the Ross Sea were superimposed on the habitat map and broken into discrete spatial ... areas. Differences in age distributions between these areas were found using ANOVA. These distributions ... and older fish were located on the continental slope. In addition, the older and most mature ...
Meeting Document : WG-FSA-08/18 : Author(s): C.M. Brooks and J.R. Ashford (USA)
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Evaluating methods to assess yield of Patagonian toothfish (Dissostichus eleginoides) in CCAMLR Division 58.5.2
developed to evaluate possible management strategies for the Patagonian toothfish fishery in Division 58.5.2 ... currently being used for Patagonian toothfish in Division 58.5.2, the types of data and observations of the ... Subgroup on Assessment Methods workshop to be held prior to the meeting of WG-FSA in 2005. These results ... will be presented in an updated version of this paper provided to the workshop. Author(s): A.J ...
Meeting Document : WG-FSA-05/69 : Author(s): A.J. Constable, I. Ball, B. Raymond, S. Candy, R. Williams (Australia) and A. Dunn (New Zealand)
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Accounting for food requirements of seabirds in fisheries management – the case of the South African purse-seine fishery
Abstract: In South Africa, four seabirds that feed mainly on sardine Sardinops sagax and anchovy ... requirements have not been accounted for in management of the purse-seine fishery on sardine and anchovy. Means ... conservation status of a species may prove useful in determining minimum viable populations, and that the use ... of functional relationships in coupled models of predators and their prey may enable quantification ...
Meeting Document : WG-EMM-04/28 : Author(s): R.J.M Crawford (South Africa)
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Preliminary analyses of data collected during experimental fishing for Patagonian toothfish in international waters of the southwest Indian Ocean (Area 51)
procedures, in a restricted area south of Madagascar and north of the Prince Edward and Marion Islands and ... and 1950 metres depth. The Patagonian toothfish appeared in all those sets carried out with values ... of the main ground, in which a residual recruitment effect persists. The total CPUE was 42.21 kg/1000 ... hooks. Depth is the most important factor in Patagonian toothfish distribution within the study area ...
Meeting Document : WG-FSA-04/19 : Author(s): L.J. López Abellán (Spain)
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USING GENERALIZED DISSIMILARITY MODELLING TO ANALYSE AND PREDICT PATTERNS OF BETA DIVERSITY IN REGIONAL BIODIVERSITY ASSESSMENT
predicting spatial patterns of turnover in community composition (beta diversity) across large regions. The ... nonlinearity commonly encountered in large-scaled ecological data sets: (1) the curvilinear relationship ... ) the variation in the rate of compositional turnover at different positions along environmental ... assessment activities including visualization of spatial patterns in community composition, constrained ...
Meeting Document : WS-VME-09/P03 : Author(s): Richardson, K., Manion, G., Ferrier, S., Elith, J.
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Some aspects of the relation between Antarctic krill abundance and CPUE measures in the Japanese krill fishery. (Component of SC-CAMLR-VI/BG/4)
quality considerations- in particular the increasing tendency to avoid catching "green” krill. These ... factors result in Catch-per-Day and Catch-per-Haul measures being unlikely to index krill abundance ... time data may be needed to assess the density of swarms in a concentration, but may be difficult to ... record in practice, and a number of other factors may complicate any analysis. The possibility of ...
Meeting Document : WS-KCPUE-89/03 : Author(s): D.S. Butterworth (South Africa)