Résultats de la recherche
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Natural mortality rate in the mackerel icefish (Champsocephalus gunnari) around South Georgia
Paper Title: Natural mortality rate in the mackerel icefish (Champsocephalus gunnari) around ... careful consideration of the data and available methods, several errors are noted in earlier estimates ... following year the information in Frolkina and Dorovskikh (1990) was presented in revised form in Frolkina ... by Frolkina and Dorovskikh (1991) and Olsen (1955) for each year is set out in Figure 1. Analysis ... significantly higher in the recruiting year class than in all other year classes. This could be because three ... and whether the increment in size within a year is realistic. The five data sources mentioned above ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 245–257 : Auteur(s): Everson, I
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On the presence of Paralomis spinosissima and Paralomis formosa in catches taken during the Spanish survey Antártida 8611
seven hauls of the 29 made around Shag Rocks and in 20 of the 104 hauls made at South Georgia. P ... Paper Title: On the presence of Paralomis spinosissima and Paralomis formosa in catches taken ... the archipelagos in the Scotia Sea. A total of 345 hauls was conducted, of which 29 took place around ... m. In the whole of the area surveyed, the two crab species of the genus Paralomis (P. spinosissima ... . spinosissima was caught in seven hauls of the 29 made around Shag Rocks and in 20 of the 104 hauls made at ... . Tows were 30 minutes in duration and the vessel speed was three knots. The trawl used for sampling ... , occurring in seven of the 29 hauls (24.14%) carried out around Shag Rocks and in 20 of the 104 (19.23 ... 30% sand and the remainder gravel. However, the presence of certain species of invertebrates in ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 165–173 : Auteur(s): López Abellán, L.J. and E. Balguerías
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Significant intra-annual variability in krill distribution and abundance at South Georgia revealed by multiple acoustic surveys during 2000/01
March 2001 (late-season). The surveys were the first in a newly planned five-year series of observations ... observations from previous years, krill density in the western box in the mid-season survey was less than that ... Paper Title: Significant intra-annual variability in krill distribution and abundance at South ... acoustic surveys of Antarctic krill (Euphausia superba) were conducted around South Georgia in the 2000/01 ... results of surveys conducted in the fi rst year (2000/01) of the new series, commenting additionally on ... g m-2 in any year, that year could be considered one of ‘unusually low’ krill abundance, in which ... - season (to 34.7 g m-2). In a pattern that is consistent with observations from previous years, krill ... 2004/05. Surveys in previous years have generally been restricted to a single, month-long period in ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 71–82 : Auteur(s): Brierley, A.S., C. Goss, S.A. Grant, J.L. Watkins, K. Reid, M. Belchier, I. Everson, M.J. Jessop, V. Afanasyev and J. Robst
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Precautionary spatial protection to facilitate the scientific study of habitats and communities under ice shelves in the context of recent, rapid, regional climate change
communities under ice shelves in the context of recent, rapid, regional climate change Abstract / Description ... : Recent rapid climate change is now well documented in the Antarctic, particularly in the Antarctic ... % of the Peninsula’s glaciers have retreated in recent decades. Further ice-shelf collapse will lead to ... the loss of existing marine habitats and to the creation of new habitats, with consequent changes in ... volume of deep water in Pine Island Bay has increased in recent years. Faster basal melting under the ... coastal glaciers around the Antarctic Peninsula in the last 50 years has exposed at least 2.4 × 104 km2 ... to a reduction of almost 25% in the ice shelf in just two years. Similarly, the area of the Larsen ... ) should receive long-term protection for scientific study in accordance with Article IX.2(g) of the ...
Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 139–151 : Auteur(s): Trathan, P.N., S.M. Grant, V. Siegel and K.-H. Kock
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A functional division of Electrona carlsbergi (Tåning, 1932) area of habitat in relation to the latitudinal zonation of the Southern Ocean
Southern Atlantic along two meridional transects at 17° and 20°W in the latitudes from 37°30' to 55°30 ... Paper Title: A functional division of Electrona carlsbergi (Tåning, 1932) area of habitat in ... the RV Vozrozhdenie (VNIRO, USSR) in March/April 1990 an integrated study survey was conducted in the ... of E. carlsbergi were analysed by length composition, sex ratio and maturity stages in relation to ... transects at 17° and 200W in the latitudes from 37°30' to 55°30'S. The survey was mainly focussed on ... in the latitudinal band between 37°30' and 55°30'S. The choice of these two meridians was dictated ... between stations on the transects was 30 miles (each 30' of latitude and longitude in the small-scale ... encountered in 20 of the 26 hauls. It was found in the catches of two hauls in the Antarctic Zone, four hauls ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 369–395 : Auteur(s): Zemsky, A.V. and S.A. Zozulya
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Analysis of the diet of Champsocephalus gunnari at South Georgia in late summer from 1994 to 1997, Dr Eduardo L. Holmberg surveys
/without food in Subarea 48.3, did not show a consistent pattern from year to year. Likewise, in the four ... and Thysanoessa sp., which are known to be important alternative food in years of krill scarcity, as ... years of krill scarcity), intermediate in 1995 (below years of historically high abundance), and high in ... 1996 and 1997 (in line with years of high krill abundance). This information is well in accord with ... fish (ranges 12-20 cm/l-2 years) was found in the catches during the RV Dr Eduardo L. Holmberg ... 30 years, even lower than in 1977/78 and 1991, years of krill 'shortage' (Figures 2 and 3) (Kock et ... four years, while krill biomass densities were comparable with those in the previous year and were ... and varied from year to year. The spatial distribution of the main prey items in the diet of C ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 103–123 : Auteur(s): Barrera-Oro, E., R. Casaux and E. Marschoff
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Assessment and tag program adaption methods for exploratory fisheries in the CAMLR Convention Area: an example application for Division 58.4.3a
tagging levels that will produce an expected abundance estimate in the following year of a given precision ... Paper Title: Assessment and tag program adaption methods for exploratory fisheries in the CAMLR ... exploratory stocks in the CAMLR Convention Area. The assessment methodology is designed to be able to ... tested using the assessment results for toothfish in CCAMLR Subarea 48.3 and the assessment method is ... ), not its status relative to 20% of K in the final year of projection. One might then expect that ... will produce an expected abundance estimate in the following year of a given precision whilst ensuring ... ) For the first year of release, y*, the number of tags in the population is immediately reduced by ... . Binomial recapture model In a given year, the probability of recapturing a tagged fish in the legal fleet ...
Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 101–113 : Auteur(s): Hillary, R.M
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Precautionary measures for a new fishery on Martialia hyadesi (Cephalopoda, Ommastrephidae) in the Scotia Sea: an ecological approach
, Ommastrephidae) in the Scotia Sea: an ecological approach Abstract / Description: In anticipation of the ... development of a new fishery for the ommastrephid squid Martialia hyadesi in the Scotia Sea, this paper ... conservative estimate for total annual consumption of M. hyadesi by higher predators in the Scotia Sea is 245 ... spawns between autumn and mid-summer with peak hatching in winter/spring. Its life span has not been ... in that year (Rodhouse, 1991). In February 1989 two Japanese squid jiggers carried out an ... were more mature in samples taken later in the year; ranging from stage I1 (Lipinski, 1979) at the ... increments in statoliths were up to one year old (Rodhouse, 1991; Rodhouse et al., 1994). Given the early ... two-year life cycle. However, Arkhipkin and Silvanovich (in press) have found a small number of ...
Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 125–139 : Auteur(s): Rodhouse, P.G
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Length-at-age in juvenile Patagonian toothfish (Dissostichus eleginoides)
observed in the length density represent different age cohorts separated by one year. File: 01ashford.pdf ... Paper Title: Length-at-age in juvenile Patagonian toothfish (Dissostichus eleginoides) Abstract ... estimated from reading otoliths in a goodness-of-fit test. The majority of the otoliths (83.6%) were ... estimated to be from fish 1+ or 2+ years old, with mean total lengths of 32.5 cm and 41.3 cm respectively ... taken off South Georgia in January 2000. Age 0+ Age 1+ Age 2+ Age 3+ Age 4+ 40 30 20 10 0 40 ... ned as 1+ year old. As in previous years, apart from the dates of the groundfi sh survey, no ... ). The modal values were similar to those which had been assumed to represent year classes in previous ... to the length-frequency peaks shown in Figure 2, indicating that the two large peaks represent year ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 1–10 : Auteur(s): Ashford, J., C. Jones, S. Bobko and I. Everson
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Factors to consider in developing management measures for krill
Paper Title: Factors to consider in developing management measures for krill Abstract ... year to year. The various techniques used to estimate the abundance of animal populations also give ... constant from year to year. Yet either strategy has to achieve the same conservation objectives. In ... fluctuations in catch from year to year cannot all be fully achieved simultaneously. For example, steady ... year to year. 3.5 Time Frame for Implementation A further element to consider in developing ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 175–187 : Auteur(s): de la Mare, W.K.