Résultats de la recherche
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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
Paper Title: Timing of clutch initiation in Pygoscelis penguins on the Antarctic Peninsula ... . In this paper the authors present an analysis relating to both these challenges. Clutch initiation ... Petermann Island) in relation to potential drivers of clutch initiation (e.g. temperature, precipitation ... factor related to the timing of clutch initiation in all three of the penguin species examined (Adélie ... count that could be obtained in any given year are not strictly coin- cident, and the maximum census ... Palmer Station staff.) 3 Data downloaded from www.antarctica.ac.uk/met/gjma/ 4 In order to avoid ... year of measure- ment was included as a third covariate in the final model. Final model for ... each site (j) in each year (t) were modelled as being distributed around the actual clutch initiation ...
Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 149–165 : Auteur(s): Lynch, H.J., W.F. Fagan, R. Naveen, S.G. Trivelpiece and W.Z. Trivelpiece
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Status of the krill stock around Elephant Island in 1991/92 and 1992/93
Paper Title: Status of the krill stock around Elephant Island in 1991/92 and 1992/93 Abstract ... / Description: Krill stock composition and distribution patterns in the vicinity of Elephant Island during the ... appears to be a recurring and predictable aspect of the krill stocks in the Antarctic Peninsula region ... . The length frequency distributions and maturity stage composition reflected relatively good year class ... -south transects between 60" and 62"s and 53" and 57"30'W ('Elephant Island box'). In 1993 additional ... differences in the year class success and recruitment of the previous year's spawn. Substantial proportions ... of juveniles and krill lengths <30 mm in 1992 (Figures 4 and 7) resulted from successful spawning ... and larval survival in 1991 and a relatively good 1990/91 year class. The paucity of juveniles and ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 7–33 : Auteur(s): Loeb, V. and V. Siegel
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Food consumption by predators in a CCAMLR integrated study region
Paper Title: Food consumption by predators in a CCAMLR integrated study region Abstract ... consumption of seabird predators is provided. This model is a development of earlier ones used in the South ... Georgia Integrated Study Region and incorporates new features, allowing for seasonal variation in predator ... energy requirement on each day of the year for each species in the community. Because the sizes ... breeding cycle in one year, wandering, grey-headed and light-mantled sooty albatrosses breed biennially ... energy costs, rather than empirical values for the species concerned, resulted in a 30% decrease in food ... extrapolating the diet in the chick-rearing period through the whole year. Allowing for seasonal changes in ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 489–519 : Auteur(s): Croxall, J.P., C. Ricketts and A.G. Wood
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Estimates of fish stock biomass around South Georgia in January/February 1985
reduction in stock size to 10 – 20% of that estimated before the onset of heavy fishing. In C. gunnari the ... Paper Title: Estimates of fish stock biomass around South Georgia in January/February 1985 ... Abstract / Description: Catch data from a bottom trawl survey in January/February 1985 have been used to ... fishery is dependant on the abundance of the recruiting year class. Conservation measures adopted by ... in stock size to 10 ~ 20% of that estimated before the onset of heavy fishing. In C. gunnari the ... catches of C. gunnari were in general less than 100 kg/30 min which indicates a n even distribution of ... distribu ted with catches rarely exceeding 50 kg/30 min. Juveniles of 30-70 cm pred ominated in the ... /30 min. Estimated stock size of 8 159 t may thus be r a ther ina ccurate (table 1). It is in the ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/2 (Selected Scientific Papers, SC-CAMLR-SSP/2) : 1-32 : Auteur(s): Kock, K.-H.
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Commercial krill fisheries in the Antarctic, 1973 to 1988
Paper Title: Commercial krill fisheries in the Antarctic, 1973 to 1988 Abstract / Description ... ) are used to discern observable trends in catch and effort for the Antarctic krill (Euphausia superba ... tonnes in 1981/82 before dropping to allow level in 1983/84 and stabilizing at about 400 000 tonnes ... thereafter. In terms of both catch and effort the Soviet and Japanese krill fisheries in Subareas 48.1, 48.2 ... split-years; a split-year being the twelve month period from 1 July in one year to 30 June in the next ... /76 season when no krill were taken in this area) than in Statistical Areas 58 and 88 for anyone year ... . A further breakdown of catches by subarea, split-year and month is shown in Figure 11. Although ... Japanese fishery combined) in Figure 12. Indications are that despite fluctuations from year to year, all ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 229–281 : Auteur(s): Miller, D.G.M.
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A study of Patagonian toothfish (Dissostichus eleginoides) post-tagging survivorship in Subarea 48.3
in Subarea 48.3 Abstract / Description: During the 2005 fishing season, experiments on the ... survivorship of toothfish following tagging were carried out on eight different vessels fishing in Subarea 48.3 ... . Toothfish were kept in tanks with seawater replacement for at least 12 hours after tagging. On one vessel ... , fish with a variety of injuries were selected to see if this affected recovery. In the final analysis ... - dence of having recovered from serious injuries in previous years including extensive scarring around ... that had been tagged and released in earlier years, or were assumed to be fish that had fallen off the ... line before being landed in previous years. Once in the tanks most fish were inactive except when ... study of PAtAgoniAn toothfish (Dissostichus eleginoiDes) Post-tAgging survivorshiP in subAreA 48.3 ...
Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 279–289 : Auteur(s): Agnew, D.J., J. Moir Clark, P.A. McCarthy, M. Unwin, M. Ward, L. Jones, G. Breedt, S. Du Plessis, J. Van Heerdon and G. Moreno
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Environment–krill relations in the South Georgia marine ecosystem
were only expressed strongly in years of extreme conditions. The correlation with water temperature was ... Paper Title: Environment–krill relations in the South Georgia marine ecosystem Abstract ... / Description: Interannual variability in the Southern Ocean ecosystem has long been noted and physical factors ... variability and it is only recently that physical datasets have been generated for the Southern Ocean. In this ... -72 0 Year Figure 7: Interannual variation in ice-edge position. 1 - at 30°W in October; 2 - at ... : (a), (b), (c) - in the same year; (d) - ice-edge position at 30°W averaged for December-January and ... were available; 3 - position of ice-edge in March of a particular year. Environment-Krill ... longitudes 20°, 30°, 40' and 50°W. For the period 1973 to 1989, a further sea-ice dataset was available ...
Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 13–30 : Auteur(s): Fedoulov, P.P., E. Murphy and K.E. Shulgovsky
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The use of patent databases to predict trends in the krill fishery
Paper Title: The use of patent databases to predict trends in the krill fishery Abstract ... / Description: The fishery for Antarctic krill (Euphausia superba) caught 210 000 tonnes in 2009/10 with ... vessels from six of CCAMLR’s 25 Members participating in the fishery. Trends in the krill fishery are ... detect trends in the fishery, and of the need to obtain more information from the krill industry so that ... : Percentages of total patents lodged by most patent active countries, in year groups. 0 10 20 30 40 50 ... the database, the last year in any time series always underestimates the number of patents lodged ... patents) patents lodged in each of the two previous 10-year periods. There has been a notable increase ... industry from Members who are not necessarily directly involved in fishing activities. Consequently, it ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 135–144 : Auteur(s): Foster, J., S. Nicol and S. Kawaguchi
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Notes on the use of virtual population analysis for stock assessment of the mackerel icefish, Champsocephalus gunnari (Lönnberg, 1906) in Subarea 48.3 for the 1990/91 and 1991/92 seasons
techniques, from 1991 back to 1977. The predicted age structure, dominated in recent years by the 1987 year ... -class (1 year olds in 1988), was quite robust, despite the use of various combinations of survey and ... proportion of 5 year olds, which was not observed during the survey on Falklands Protector in January 1992 ... . Breakdown in the credibility of the VPA results in most recent years is attributed to the invalid assumption ... . The predicted age structure, dominated in recent years by the 1987 year-class (1 year olds in 1988 ... recent years dominated by the year class spawned in late 1985/86, recruiting as 1 year olds in 1987/88 ... produced much lower estimates of abundance in the most recent years than MAFF5. The picture of year class ... year. Similarly in other years the assumed commercial age distribution will depend upon where the ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 49–79 : Auteur(s): Parkes, G.
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Changes in the fish biomass around Elephant Island (Subarea 48.1) from 1976 to 1996
from 1978/79 to 1988/89, with most of the commercial harvesting taking place in the first two years of ... Paper Title: Changes in the fish biomass around Elephant Island (Subarea 48.1) from 1976 to 1996 ... Abstract / Description: Finfish stocks in the Antarctic Peninsula region (Subarea 48.1) were exploited ... the fishery. Results of bottom trawl surveys conducted by Germany in the vicinity of Elephant Island ... class; fish from this year class were 20 to 25 cm long in January/February 1976 and 30 to 37 cm in ... . Changes in the Fish Biomass around Elephant Island 10 20 30 40 50 Length (cm) Length (cm) Length ... ) in a limited area on the northwestern shelf of the island, showed the predominance of the 1973 year ... January-February 1978 (Figure 2). This year class formed the backbone of the fishery in the subsequent ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 165–189 : Auteur(s): Kock, K.-H