Résultats de la recherche
-
Consideration of major issues in ecosystem monitoring and management
Paper Title: Consideration of major issues in ecosystem monitoring and management Abstract ... / Description: This paper outlines the requirements of an ecosystem approach to the management of Southern ... availability of krill, variation in vital rates of the dependent species and the overlap between commercial ... means of CEMP. The overlap between fishing and predator foraging is being monitored. A mechanism for ... of krill. At the one extreme, foraging trip duration refl ects the local availability of krill ... the trip, the lower the availability of krill. These indices are likely to have very short response ... life span of the bird is short, then the loss of a single year class will have a major effect ... . 9 (2002): 213–232 213 CONSIDERATION OF MAJOR ISSUES IN ECOSYSTEM MONITORING AND MANAGEMENT I ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 213–232 : Auteur(s): Everson, I
-
Statistical power to detect changes in growth rates of Antarctic fur seal pups
changes (between years) in pup growth rates, the loss of power associated with obtaining weight samples on ... Paper Title: Statistical power to detect changes in growth rates of Antarctic fur seal pups ... Abstract / Description: Numerical simulations were used to investigate the power of methods for detecting ... only three dates in a season, and potential means of increasing the power of the CCAMLR Ecosystem ... ) in pup growth rates, the loss of power associated with obtaining weight samples on only three dates ... loss of power associated with obtaining only three weight samples, and possible means of increasing ... IN GROWTH RATES OF ANTARCTIC FUR SEAL PUPS P. Boveng, J. L. Bengtson and M. E. Goebel Abstract ... Numerical simulations were used to investigate the power of methods for detecting changes (between years ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 399–409 : Auteur(s): Boveng, P., J.L. Bengtson and M.E. Goebel
-
Distribution and population structure of Dissostichus eleginoides and D. mawsoni on BANZARE Bank (CCAMLR Division 58.4.3b), Indian Ocean.
Paper Title: Distribution and population structure of Dissostichus eleginoides and D. mawsoni on ... composition, sex ratio and sexual maturity of Dissostichus eleginoides and D. mawsoni from BANZARE Bank were ... shallower banks (<1 000 m), while D. mawsoni was caught on deeper slopes (>1 500 m). Separation of the ... two species by depth may be related to physical intolerance to cooler temperatures because of the lack ... /07 and 2008/09 seasons (Table 1). Discussion Yukhov (1972) suggested that the distribution of ... ) surveyed the stock status of coastal D. mawsoni in Divisions 58.4.1 and 58.4.2 (East Antarctica) and ... clarify the lifecycle of this species in BANZARE Bank and adjacent East Antarctica. This study ... L.J. López Abellán. 2009. Status of the coastal stocks of Dissostichus spp. in East Antarctica ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 145–153 : Auteur(s): Taki, K., M. Kiyota, T. Ichii and T. Iwami
-
Acoustic estimates of krill density at South Georgia, 1981 to 1998
Paper Title: Acoustic estimates of krill density at South Georgia, 1981 to 1998 Abstract ... / Description: Acoustic estimates of densities of Antarctic krill, Euphausia superba, at South Georgia during ... 1994 austral summer seasons were characterised by particularly low densities of krill (upper 95 ... % confidence limits <15 g m-2). For five of the summers between 1990 and 1998 it was possible to calculate ... the east of South Georgia (high variance) only 15 of the possible 210 four-transect means fell ... available. The east/west variability could be caused by differing rates of krill flux, differing predation ... western end of South Georgia than the east (Everson, 1984; Boyd, 1993; Trathan et al., 1998), and the ... . Krill abundance is usually higher to the east of South Georgia than to the west. This may be due to ...
Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 47–57 : Auteur(s): Brierley, A.S., J.L. Watkins, C. Goss, M.T. Wilkinson and I. Everson
-
Effect of line sink rate on albatross mortality in the Patagonian toothfish longline fishery
Paper Title: Effect of line sink rate on albatross mortality in the Patagonian toothfish longline ... vessels to derive a sink rate and line-weighting regime that would minimise the capture of albatrosses ... based on knowledge of line sink rates and albatross diving abilities. Sink rates of lines deployed into ... propeller turbulence, which tended to keep lines aloft, varied as a function of distance between line ... the end of the snoods on the mother line from the anchors. The anchors were attached to 18 mm ropes ... line and were suspended along the entire length of the mother line to within 600 m of anchors and to ... within 70 m of weights attached to the mother line at 1 600 m intervals. Branch lines were 18 m in ... . Each batch of 20 baskets was followed by 140 m of mother line with no branch lines attached; a 15-20 ...
Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 133–150 : Auteur(s): Robertson, G.G
-
Distribution characteristics of krill aggregations in the fishing ground off Coronation Island in the 1989/90 season
Paper Title: Distribution characteristics of krill aggregations in the fishing ground off ... Coronation Island in the 1989/90 season Abstract / Description: Distributional characteristics of krill ... biological condition of krill and the performance of the fishery. Investigations were carried out from ... October 1989 to February 1990. An echo sounder was used to assess the characteristics of krill ... feeding conditions leads to krill being scattered (Latogursky, 1972). Moreover, sexual maturation of ... WG-KRILL-90/20 DISTRIBUTION CHARACTERISTICS OF KRILL ... . Latogursky* * Abstract Distributional characteristics of kriU aggregations in the Coronation Island ... fishing ground were examined in relation to environmental factors, the biological condition of krill and ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 49–73 : Auteur(s): Kasatkina, S.M. and V.I. Latogursky
-
Diet of the Antarctic toothfish (Dissostichus mawsoni) from the Ross Sea, Antarctica (Subarea 88.1)
Paper Title: Diet of the Antarctic toothfish (Dissostichus mawsoni) from the Ross Sea, Antarctica ... (Subarea 88.1) Abstract / Description: The diet of Antarctic toothfish (Dissostichus mawsoni) captured by ... stomachs examined respectively). Fish sampled in 2001 were caught at depths of 317 to 2 154 m and ranged ... from 58 to 190 cm in total length (TL). Fish sampled in 2002 were caught at depths of 815 to 1 623 m ... data unavailable) along with that of six other fi sh species in the Cosmonaut Sea (East Antarctica ... rations. J. Ichthyol., 32 (1): 138– 146. Permitin, Yu.Ye. and M.I. Tarverdiyeva. 1972. The food of ... . 10 (2003): 113–123 113 DIET OF THE ANTARCTIC TOOTHFISH (DISSOSTICHUS MAWSONI) FROM THE ROSS SEA ... Zealand Email – jmfenaughty@clear.net.nz D.W. Stevens National Institute of Water and Atmospheric ...
Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 113–123 : Auteur(s): Fenaughty, J.M., D.W. Stevens and S.M. Hanchet
-
Analysis of results from demersal fish surveys at South Georgia, undertaken by the United Kingdom and the USSR, January and February 1990
Paper Title: Analysis of results from demersal fish surveys at South Georgia, undertaken by the ... discussions and analyses of the data from a survey from MV Hill Cove in January 1990 and RV Akademik Knipovich ... in February 1990 around South Georgia. Both surveys were characterized by large numbers of small ... hauls interspersed with a few large catches. The small number of large catches cause a disproportionate ... region east of 37°. The results from this comparison are set out below. The analyses were made using ... finding the proportion of total swept area covered by the highest density in the middle stratum of ... the density of the haul from station 16, and then by the total seabed area in the middle stratum of ... of previous surveys, the greatest proportion being present in the middle (150 to 250 m) depth 236 ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 223–254 : Auteur(s): (Report of a Joint UK/USSR Workshop, 23 to 27 July 1990)
-
Improving estimates of Adélie penguin breeding population size: developing factors to adjust one-off population counts for availability bias
Paper Title: Improving estimates of Adélie penguin breeding population size: developing factors ... presented for the collection and development of data to adjust counts of Adélie penguins made at any time in ... the breeding season to an estimate of the breeding population. The development of ‘availability ... adjustment factors’ involves the collection of time-series counts of population objects, such as adults ... of availability adjustment data for Adélie penguins in East Antarctica. Availability curves, such ... laying their eggs around mid- November (Davis, 1988) to undertake a foraging trip of around 17 days ... nest, and nest loss is minimal. Consequently, a count of occupied nests at this point provides the ... ImprovIng estImates of adélIe penguIn breedIng populatIon sIze: developIng factors to adjust one-off ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 229–241 : Auteur(s): Southwell, C., J. McKinlay, L. Emmerson, R. Trebilco and K. Newbery
-
Quantifying vessel performance in the CCAMLR tagging program: spatially and temporally controlled measures of tag-detection rates
temporally controlled measures of tag-detection rates Abstract / Description: A reliable commercial fish ... tagging program is critical to the successful management of a number of toothfish fisheries in Antarctica ... an integrated stock assessment. Previous attempts to assess the relative reliability of vessels in ... detecting tagged fish have been inconclusive due to low numbers of recaptures after controlling for spatial ... probability of recapture for both the case and the controls, irrespective of fish move- ment or tag loss ... -structured stock assessment model of Antarc- tic toothfish (Dissostichus mawsoni) to determine sustainable ... yields (Mormede et al., 2011a, 2011b; Mormede, 2011). In those analyses, the assumed values of ... mortality of tagged fish and the subse- quent detection rate of recaptured tagged fish are important input ...
Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 73–80 : Auteur(s): Mormede, S. and A. Dunn