Résultats de la recherche

1. The sensitivity of multiple output statistics to input parameters in a krill–predator–fishery ecosystem dynamics model

   : a multiplier with range (0,1) of the ‘movement linear’ movement matrices (Tables 3 and 4 in Hill ... years. The current description uses the notation 1970(1) refers to the combination of year (1970) and ... several years but man- agement reference points exist only for the target stock and not for its predators ... productivity, health, resilience and services. These objectives are also consistent with CCAMLR’s con ...

   Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 97–118 : Auteur(s): Hill, S.L. and J. Matthews

2. Can we use discriminant function analysis to sex penguins prior to calculating an index of a morphometric characteristic?

   birds with greater than 80% success, the difference between the true and apparent mean is likely to be ... discriminant function with greater than 80% success may be used to derive statistically robust estimates of ... Type I and Type II errors. Lack of knowledge about the sex ratio between years makes combining the data ... discriminant functions are able to correctly determine the sex of birds with greater than 80% success, the ... sampled. Therefore, under most normal sampling regimes a discriminant function with greater than 80 ... birds. Concern was expressed that it may be necessary to know the sex of birds with absolute accuracy ... males and females with a certain error, is this likely to give us a false estimate of the ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 259–272 : Auteur(s): Agnew, D.J.

3. Champsocephalus gunnari stock status in the South Georgia area

   and TAC for C. gunnari. Stock estimates were obtained using VPA with the following variations: mean F ... prediction the stock size value was obtained by VPA with variations using F regression methods. The ... recruitment was taken at the lowest possible level for all these years (400 million specimens). Catch-per-unit ... were obtained using VPA with the following variations: mean F, Gamma methods, Pope and Shepherd method ... obtained by VPA with variations using F regression methods. The recruitment was taken at the lowest ... if FO.1 = 0.439. * All stock status and TAC predictions were made with the assumption that ... Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 Table Legends Age (years) and weight (gr ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 1-18 : Auteur(s): Borodin, R. and P. Kochkin

4. The Kerguelen database

   . At the end of the split-year 1985/86 25445, trawlings have been registered in a database. The LFD ... effort during the year. During spring and summer the fishing effort is greatest due to better ... effort occurs in the Southern, South-Eastern part of the shelf (see Figure 8). The effort extends from ... the integration method). This is very useful as age determination with oto1iths is difficult. We ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 23-54 : Auteur(s): Duhamel, G.

5. Krill population biology during the 1991 Chilean Antarctic krill fishery

   and 55 mm TL, with a mean TL of 45 mm for females and 48 mm for males. A very weak mode for juvenile ... % juveniles. Of the females sampled, 25.2% bore spermatophores. Although the smallest specimen found with a ... spermatophore had a 36.5 mm TL, 80% of the females with spermatophores had a TL larger than 45 mm. In Area B, a ... bimodal size frequency distribution and a larger size range were found, with one mode between 32 and 55 mm ... were between 45 and 53.7 mm TL with a mode of 46.5 mm TL (Figure 3). In Area B north of Elephant ... ) Figure 3: Size frequency distribution of total females and females with spennatophores in Area A. 230 ... between 30 and 55 mm TL, with a mean TL of 45 mm for females and 48 mm for males. A very weak mode for ... specimen found with a spermatophore had a 36.5 mm TL, 80% of the females with spermatophores had a TL ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 223–235 : Auteur(s): Mujica R., A., E. Acuña S. and A. Rivera O.

6. 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 ... most reliable method. Mean length data at age presented here for Low I. specimens were compared with ... one extra year (Table 1). This could arise from the difficulties with false checks as mentioned above ... , while Hoffmann (1982) worked with first pelvic fin ray. Later on, Clasing et al. (1985), using otoliths ... compared in 19 Potter Cove specimens. In some cases scale readings gave a result of one year more. This ... presented here for Low I. specimens were compared with previous published values. This confirmed that fish ...

   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.

7. Quantifying movement behaviour of vessels in the Antarctic krill fishery

   operations by Japanese fishing vessels. There were differences between statistical areas with longer ... analyses demonstrate the need for high-quality year-round data on all vessels participating in the krill ... / Description:  Ten years of recent fine-scale haul-by-haul krill data were used to characterise the behaviour ... abundance coincided with a year with a relatively high prob- ability of fishing operations observed to ... 17.3 tonnes with a three-year average of 16.3 tonnes and median of 16.0 tonnes (Table 1). Further ... catches of 10–15 tonnes/haul and greater with a corresponding average distance of approximately 2–3 n ... tonnes/haul, then the fleet stays with the current krill concentration, but if it is below 3 tonnes ...

   Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 131–148 : Auteur(s): Kawaguchi, S. and S.G. Candy

8. A compilation of parameters for ecosystem dynamics models of the Scotia Sea – Antarctic Peninsula region

   global ocean circulation model. This parameter set, like most others, is associated with considerable ... , with perciform fish taking as much krill as whales, penguins and fur seals combined and myctophid fish ... most others, is associated with considerable uncertainty, which must be taken into account when it is ... suggest that fi sh are the major krill consumers in all SSMUs, with perciform fi sh taking as much krill ... species must also be parameterised. The models must also account for uncertainties associated with the ... represent the dynamics of preda- tor populations with delay-difference equations in which individuals ...

   Science Journal Paper : CCAMLR Science, Volume 14 (CCAMLR Science, Volume 14) : 1–25 : Auteur(s): Hill, S.L., K. Reid, S.E. Thorpe, J. Hinke and G.M. Watters

9. Survey of Antarctic fur seals in the South Shetland Islands, Antarctica, during the 1986/87 austral summer

   seals in the South Shetland Islands have been censused sporadically over the past 80 years, with the ... increased to a population estimated in the early 1980's at just under 1 million (Payne 1977; Banner, 1981 ... ). Surveys were flown at approximately 100 meters altitude, with photographs taken of large groups to ... by species, with no differentiation made between age and sex classes except for fur seals. At ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 427-440 : Auteur(s): Bengtson, J.L., L.M. Ferm, T.J. Härkönen, E.G. Schaner and B.S. Stewart

10. A comparison between otoliths and scales for use in estimating the age of Dissostichus eleginoides from South Georgia

    with age. Patagonian toothfish (Dissostichus eleginoides) is considered to be a long-lived species ... Ecomet 3 grinder-polisher, using Mark V Laboratory 3M aluminium oxide polishing paper, and covered with ... 3), with-otolith treatments were sigruficantly different, and treatment comparisons using SNK and ... with age. Patagonian toothfish (Dissoslicliirs elcginoides) is considered to be a long-lived species ... can be underestimated, especially in long-lived species whose growth is concentrated in the early ...

    Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 75–92 : Auteur(s): Ashford, J.R., S. Wischniowski, C. Jones, S. Bobko and I. Everson

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