Search results
-
Environmental variability and the behavioural dynamics of Antarctic fur seals in the South Atlantic
Abstract: Variability in the reproductive performance of marine predators may be a result of ... physical forcing by large-scale oceanographic variability. Time lags, remoteness from the epicentre of a ... physical process and the simultaneous action of multiple physical processes often mean that it is difficult ... . This study examined variation in the foraging behavior of lactating Antarctic fur seals (Arctocephalus ...
Meeting Document : WS-AREA 48-98/16 : Author(s): I.L. Boyd (UK)
-
Further development of pairwise tag detection performance index and its application to the stock assessment of toothfish in the Ross Sea fishery
sustainable yields. The assessment model assumes that all vessels have equal tag detection rates; as a ... ) could lead to an over-estimate of the stock biomass. In this paper we develop further an index of vessel ... -specific tag detection performance for the Ross Sea fishery using a case-control methodology which controls ... for the inter-annual spatial and temporal variability of commercial fishing operations from which tags ...
Meeting Document : WG-SAM-13/34 : Author(s): S. Mormede (New Zealand)
-
The CAML/SCAR-MarBIN Biogeographic Atlas of the Southern Ocean
detecting impacts of environmental changes, developing the bio/ecoregionalisation of the Southern Ocean ... biodiversity hotspots. At the end of five years of extensive biodiversity exploration and assessment by the ... Census of Antarctic Marine Life (www.caml.aq), with 19 CAML-dedicated cruises in the whole Southern Ocean ... , and following the intense compilation efforts of biogeographic data by the SCAR-Marine Biodiversity ...
Meeting Document : CCAMLR-XXX/BG/11 : Author(s): Submitted by SCAR
-
ASSESSMENT MODELS FOR ANTARCTIC TOOTHFISH (DISSOSTICHUS MAWSONI) IN THE ROSS SEA FOR THE YEARS 1997–98 TO 2008–09
Abstract: We provide an update of the Bayesian sex and age structured population stock assessment ... model for Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea (Subareas 88.1 and SSRUs 88.2A–B ... ), using revised catch, catch-at-age, and tag-recapture data for the 2008–2009 season. The reference model ... using the selected trips tag data and the revised maturity ogive gave a similar, but slightly lower ...
Meeting Document : WG-FSA-09/40 Rev. 1 : Author(s): A. Dunn and S.M. Hanchet (New Zealand)
-
Distribution and abundance of krill in the vicinity of Elephant Island in the 1992 austral summer
in the vicinity of Elephant Island, Antarctica, from mid-January to mid-March, 1992. The first and ... last surveys covered a 105 by 105 n.mi. study area centered on Elephant Island; the second and third ... surveys covered a 60 by 35 n.mi. area immediately north of Elephant Island. During the first survey, krill ... were distributed in a wide band extending along the north side of Elephant Island and wrapping around ...
Meeting Document : WG-CEMP-92/15 : Author(s): R.P. Hewitt and D.A. Demer (USA)
-
OTOLITH-BASED AGEING OF THE PATAGONIAN TOOTHFISH (DISSOSTICHUS ELEGINOIDES) FOR THE HEARD AND MCDONALD ISLANDS: MODELLING FIXED AND RANDOM READER ERROR USING MULTIPLE READINGS OF A REFERENCE COLLECTION
calibration require an ageing error matrix as input in order to adequately account for uncertainty in the data ... resulting from the imprecision of age determination using annual ring counts from otoliths. This paper ... describes the methods and results used to provide an ageing error matrix to the HIMI toothfish integrated ... assessment using repeat readings by 4 readers of a set of 203 reference otoliths sampled from the HIMI ...
Meeting Document : WG-FSA-09/21 : Author(s): S.G. Candy, G.B. Nowara, D.C. Welsford and J.P. McKinlay (Australia)
-
OTOLITH-BASED AGEING OF THE PATAGONIAN TOOTHFISH (DISSOSTICHUS ELEGINOIDES) FOR THE HEARD AND MCDONALD ISLANDS: MODELLING FIXED AND RANDOM READER ERROR USING MULTIPLE READINGS OF A REFERENCE COLLECTION
calibration require an ageing error matrix as input in order to adequately account for uncertainty in the data ... resulting from the imprecision of age determination using annual ring counts from otoliths. This paper ... describes the methods and results used to provide an ageing error matrix to the HIMI toothfish integrated ... assessment using repeat readings by 4 readers of a set of 203 reference otoliths sampled from the HIMI ...
Meeting Document : WG-SAM-09/07 : Author(s): S.G. Candy, G.B. Nowara, D.C. Welsford and J.P. McKinlay (Australia)
-
A simulation study of the method of refining the natural mortality coefficient with Champsocephalus gunnari in Subarea 48.3 used as an example
Abstract: The method of refining the natural mortality coefficient is based on the notion that ... the free component of the regression equation between the mean-weighted coefficient of natural ... mortality as defined by the VPA and fishing effort must be equal to zero if the natural mortality ... shown that the proposed method facilitates such a refinement. When a mistake is made in the choice of ...
Meeting Document : WG-FSA-91/25 : Author(s): P.S. Gasiukov and R.S. Dorovskikh (USSR)
-
Interannual variability of the South Georgia marine ecosystem: biological and physical sources of variation in the abundance of krill
Abstract: Interannual variability is a characteristic feature of the Southern Ocean ecosystem yet ... the relative roles of biological and physical processes in generating these fluctuations are unknown ... krill (Euphausia superba) in the South Georgia area, and that the variation affects much of the ... ecosystem with the most obvious impacts on survival and breeding success of some of the major krill ...
Meeting Document : WS-AREA 48-98/8 : Author(s): E.J. Murphy, J.L. Watkins, K. Reid, P.N. Trathan, I. Everson, J.P. Croxall, J. Priddle, M.A. Brandon, A.S. Brierley (UK) and E. Hofman (USA)
-
A quantified Bayesian maximum entropy estimate of Antarctic krill abundance across the Scotia Sea and in small-scale management units from the 2000 CCAMLR survey
Abstract: We present the results of an alternative method of estimating krill abundance, and ... producing maps of krill distribution, from the data collected during the 2000 CCAMLR survey of the Scotia ... Sea. Using a probabilistic Bayesian Maximum Entropy (MaxEnt) technique, density values for the ... unsurveyed off-transect portions of the survey area were found by interpolation, and thus values for total ...
Meeting Document : WG-EMM-05/42 : Author(s): B.G. Heywood, S.F. Gull and A.S. Brierley (United Kingdom)