Résultats de la recherche

1. CCAMLR ecosystem monitoring and a feedback management procedure for krill

   l'ecosysteme de la CCAMLR met au point une technique pour deceler des baisses it court terme de performance ... level?". There are two issues that arise from this general question. First, the degree of change ... the ecosystem needs to be one that minimises errors in interpretation and action by the Commission ... required in addition to the experimental areas (even if only one experimental area is being used). They ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 345–350 : Auteur(s): Constable, A.J.

2. Distribution and size of Antarctic krill (Euphausia superba Dana) in Polish commercial catches taken in the Atlantic sector of the Southern Ocean from 1997 to 1999

   in one concentration can be as dense as 30 000 specimens per m-3 of water (Hamner et al., 1983 ... (% ) Elephant South Shetland 1999 0 5 10 15 20 25 30 35 40 45 50 55 60 Length (mm) Fr eq ue nc y ... 1 24 3 1 06 8 M ar ch 1 79 3 90 8 So ut h Sh et la nd s 19 97 M ay 4 72 4 1 ... Georgia area there were two age groups (2+ and 3+), and in the South Shetlands area only the 3+ age ...

   Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 83–105 : Auteur(s): Jackowski, E

3. Analysis of results from demersal fish surveys at South Georgia, undertaken by the United Kingdom and the USSR, January and February 1990

   ci z 70 60 50 40 30 20 10 0 f 0 1 2 3 4 5 6 7 Catch (tonnes) of C. gunnarl One ... difficulty in the area to the southern part of the west shelf (squares 19 and 20). The reports of the two ... location on the two surveys, one month apart, gave some support to the view that there may be more than ... that some form of replication had taken place. There were two schools of thought, one suggesting that ...

   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)

4. Age determination of Notothenia gibberifrons from the South Shetland Islands, Antarctic Peninsula subarea (Subarea 48.1)

   scale readings gave a result of one year more. This could arise from the difficulty in differentiating ... Notothenia gibberifrons specimens collected at two localities near the South Shetland Islands (Low I. and ... Paper Title:  Age determination of Notothenia gibberifrons from the South Shetland Islands ... between false and annual checks in scales. Age determination by otolith cross sections proved to be the ... compared in 19 Potter Cove specimens. In some cases scale readings gave a result of one year more. This ... reading of scales indicated one extra year. This finding is discussed below. Table 2 shows the observed ... one extra year (Table 1). This could arise from the difficulties with false checks as mentioned above ... ~ N 0'= 42 0 8 r ~n N~ = 53 ~ 6 4 z 2 ---- >- 14 16 18 20 22 24 26 28 30 32 34 36 38 u z t4 ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 143-160 : Auteur(s): Barrera-Oro, E.

5. Homogeneity of Adélie penguins as krill samplers

   27 31/1/90 39.98 27.10 4 30 09/1/90 42.65 14.75 4 25 19/1/90 32.11 31.78 5 41 18/1/90 40.02 ... 19 20/1/90 39.23 14.45 11 29 29/1/90 37.93 94.74 Table 2: Nested ANOV A of krill-within-days ... random samples of a patchy target population is statistically complex. One of the problems is that ... . MATERIALS AND METHODS During summer 1989/90, 27 Ad6lie penguins from the Bahia Esperanza rookery were ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 253–257 : Auteur(s): Marschoff, E. and B. Gonzalez

6. An assessment of the merits of length and weight measurements of Antarctic krill Euphausia superba

   animal has little effect upon length-weight relationships. The use of categories of sex and maturity ... prediction. Surprisingly, the stage of the moult cycle of the animal has little effect upon length-weight ... Universitat Kiel, Dusternbrooker Weg 20, 2300 Kiel, Federal Republic of Germany. Les relations publiees des ... prediccion. Sorpendentemente, la etapa del ciclo de muda del animal tiene poco efecto sobre las ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 371-373 : Auteur(s): Morris D.J., J.L. Watkins, C. Ricketts, F. Buchholz, and J. Priddle

7. An index of per capita recruitment

   recruitment (PCR) is proposed such that where R 1 is the proportion of age-l animals sampled in year y and M ... in mortality and reduction in the proportion of age-l spawners. Introducing year-to-year random ... underestimate recruits per spawner by 30% if reasonable assumptions are made regarding the variability of ... spawners and recruits. PCR was also able to track cycles in recruits per spawner after a 20% random ... with one year of mortality removed: In addition to compounding the results of two PCRy_l ... appearing as a large mode at 20 to 30 mm length and in subsequent years as progressively longer length ... . Antarctic krill, however, appear to spend one to two years in the juvenile and sub- adult stages and may ... Islands conducted over the last two decades. Strong year classes are evident in this time series, first ...

   Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 179–196 : Auteur(s): Hewitt, R

8. Indices of prey availability near the Seal Island CEMP site: 1990 to 1996

   prey density, depth, distance from Seal Island, and persistence over time. Acoustic data from two AMLR ... surveys each year were subsampled to include the foraging range of predators breeding at Seal Island ... relative biomass of juvenile krill near Seal Island during the first survey of each year as compared to the ... biomass of post-spawning adults near Seal Island during the second survey of each year. It is hoped that ... Seal Island, and persistence over time. Acoustic data from two AMLR surveys each year were subsampled ... (Figures 3 and 4). Two surveys were selected for each year, details of which are listed in Table 1. For ... juvenile krill near Seal Island during the first survey of each year as compared to the biomass of post ... -spawning adults near Seal Island during the second survey of each year. It is hoped that these indices may ...

   Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 37–45 : Auteur(s): Hewitt, R.P., G. Watters and D.A. Demer

9. Otolith microstructure of juvenile mackerel icefish (Champsocephalus gunnari) (Channichthyidae) in the South Georgia area

   comprised two year classes arising from spawning in the 1999/2000 and 2000/01 split-years. The mean width of ... 2001/02 year class lasted four months. This was estimated based on a retrospective count of daily ... increments. TL varied from 5.5 to 10.4 cm for fish in their first year (120–250 days) to 12.5–13.3 cm in 1 ... -year-old fish (477–533 days). The radius of the first annulus ranged from 0.7 to 1.3 mm. The ... the 1999/2000 (5 speci- mens) and 2000/01 (20 specimens) split-years. The 1999/2000 year class ... survey of juveniles in February–March 2002 on the South Georgia shelf. Juvenile fi sh comprised two year ... which the year is de- fi ned as the period from 1 July to 30 June of the next year (Shcherbich, 1975 ... , the specimens examined represented a mixture of two year classes which correspond to spawnings in ...

   Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 173–181 : Auteur(s): Shcherbich, L.V

10. Significant conservation benefits obtained from the use of a new fishing gear in the Chilean Patagonian toothfish fishery

    ~70–74 cm Ø~30 cm Ø~10–15 cm ~100–120 cm Hooks Snoods ~20 cm ~15 cm ~25 cm Weight 4–8 kg ... catch damage was two-fold less with the use of the new system (Figure 3). One important observation ... why the Chilean fishery authorities began to implement the NPOA- Seabirds. Two years after the ... . 80 introduction The interaction between killer whales (Orcinus orca) and longline vessels is a ...

    Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 79–91 : Auteur(s): Moreno, C.A., R. Castro, L.J. Mújica and P. Reyes

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