Résultats de la recherche

1. 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 ... appearing as a large mode at 20 to 30 mm length and in subsequent years as progressively longer length ... modes (Figure 1). The 20-year time series of R1 constructed from these observations (Siege1 et al ... years except for the moderate year class of 1990/91. The non-linear transformation of R1 to PCR ... as age-l animals. In the intervening years without strong year classes the dominant length mode is ...

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

2. Estimating the impact of depredation by killer whales and sperm whales on longline fishing for toothfish (Dissostichus eleginoides) around South Georgia

   and 4 animals, and have a relatively lower impact on catches, depressing CPUE by up to 20%. Sperm ... whales have been more frequently encountered in recent years, occurring in larger pod sizes, whereas ... 30 3 20 06 4. 2% 4. 9% 4. 4% 3 53 5 3 68 3 3 70 7 3 69 0 20 07 3. 8 ... 30 56 1 23 9 36 3 67 0 1 09 6 5. 1 23 .3 0. 40 0. 65 20 07 14 68 ... 1 62 6 26 1 75 5 58 2 4. 2 14 .0 0. 38 0. 30 20 08 18 51 1 51 1 ... South Georgia Li ne s S P W o bs er ve d (% ) 100 90 80 70 60 50 40 30 20 10 0 May ...

   Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 163–178 : Auteur(s): Moir Clark, J. and D.J. Agnew

3. Analysis of haul data from the South Georgia krill fishery

   existed between years, with 1995 being a better season than either 1994 or 1996. Aspects of mesoscale ... operating in different years. Most vessels from Poland and Ukraine operated for just a single year, while ... starting in April (1 year), May (5 years) or June (1 year), and ending in August (1 year), September (2 ... years), October (1 year), November (1 year) or December (1 year). In recent years the end date of the ... CCAMLR Science, Vol. 5 (1998): 9-30 ANALYSIS OF HAUL ...

   Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 9–30 : Auteur(s): Trathan, P.N., I. Everson, E.J. Murphy and G.B. Parkes

4. Effects of recruitment variability and natural mortality on generalised yield model projections and the CCAMLR decision rules for Antarctic krill

   CVs of 10%, 20% and 30% were added to the recruitment vectors, the proportion of recruitment vectors ... ), so a high-abundance year with 20% recruitment would produce twice the recruits as a low-abundance ... on P ro po rti on P ro po rti on P ro po rti on P ro po rti on 20 30 ... 40 50 60 20 30 40 50 60 20 30 ...

   Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 81–96 : Auteur(s): Kinzey, D., G. Watters and C.S. Reiss

5. Timing of clutch initiation in Pygoscelis penguins on the Antarctic Peninsula: towards an improved understanding of off-peak census correction factors

   chinstrap penguins. 0.4 0.6 0.8 1.0 Fr ac tio n of m ax im um c ou nt 0 5 10 15 20 25 30 Days ... since maximum count 0 5 10 15 20 25 30 Days since maximum count 0 5 10 15 20 25 30 Days since maximum ... Days since maximum count 0 5 10 15 20 25 30 0 5 10 ... 15 20 25 30 0 5 10 15 20 25 30 gentooAdélie ...

   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

6. Using ecosystem monitoring data to detect impacts

   within a few years of its onset, but a fixed reference point method could have provided this sustained ... ‘trend’, a linear change to these parameters over the 20-year simulation period. Shift Trend Pcrit ... if at ≤ acrit in two or more years of a four-year refer- ence period. Summary of methods: anomalies ... 10 years 15 years all years 0.05 0.1 0.25 0.0 0.2 0.4 0.6 0.8 1.0 10th percentile Year 1984 ... years 10 years 15 years all years 0.05 0.1 0.25 0.0 0.2 0.4 0.6 0.8 1.0 10th percentile Year ...

   Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 197–212 : Auteur(s): Hill, S.L., J. Forcada, P.N. Trathan and C.M. Waluda

7. A hypothetical life cycle for Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea region

   70°S from December to May for all years and all vessels. Month G S I ( % ) 0 5 10 15 20 25 ... occurred repeatedly (although not necessarily every year) throughout their life cycle. Eastman and De ... small 20' latitude by 20' longitude cell was calculated. These median lengths were then grouped into ... Dec Jan Feb Mar Apr May (a) Males (North) Month G S I ( % ) 0 5 10 15 20 25 Dec Jan Feb ...

   Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 35–53 : Auteur(s): Hanchet, S.M., G.J. Rickard, J.M. Fenaughty, A. Dunn and M.J. Williams

8. Investigation of bias in the mark–recapture estimate of toothfish population size at South Georgia

   allows simulation of releases by box over multiple years. The model performed as expected with test ... of toothfish typically move only 20–30 km each year (Marlow et al., 2003). This paper investigates ... correctly capture movement reversals – where an animal moves west one year and back east the next, for ... 250000 est. population (n) fis hi ng e ff or t (1 00 0 ho ok s) 0 10 20 30 40 50 60 70 ... 10 20 30 40 50 60 70 80 90 0 50000 100000 150000 200000 250000 est. population (n) pr oj ...

   Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 47–63 : Auteur(s): Agnew, D.J., G.P. Kirkwood, J. Pearce and J. Clark

9. Precautionary measures for a new fishery on Martialia hyadesi (Cephalopoda, Ommastrephidae) in the Scotia Sea: an ecological approach

   established. Data from the CCAMLR Convention Area suggest that M. hyadesi may live for two years, but this may ... 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 ... one year. Given the highly seasonal environment of the south Atlantic it is unlikely that life cycle ...

   Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 125–139 : Auteur(s): Rodhouse, P.G

10. Some principles for fisheries regulation from an ecosystem perspective

    objectives are being met to be assessed. The advantages of using a feedback method of regulation are ... quantities which can be robustly estimated, thus allowing the degree to which objectives are being met to ... seems reasonable to assume that the overall objectives of the convention are being met as far as is ... relationship between catch per unit effort and whale abundance. Rep. into Whal. Commn 35:511-20. Cushing ... Resources: a commentary. Polar Record 20:353-62. Goodwin, G.C. and Sin, K.S. 1984. Adaptive filtering ...

    Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 323-339 : Auteur(s): de la Mare, W.K.

Pages