Résultats de la recherche

1. An impact assessment framework for bottom fishing methods in the CAMLR Convention Area

   Paper Title:  An impact assessment framework for bottom fishing methods in the CAMLR Convention ... Area Abstract / Description:  This paper presents a methodological framework to estimate the likely ... cumulative impact on fragile benthic organisms from bottom fishing activity. The approach has been designed ... preliminary assessment of bottom fishing impacts for the 2008/09 toothfish longline fishery. This paper ... end of the line) and calculation of the backbone footprint based on actual length. Considerations ... the floats, downline and anchors on the end of the fishing line are cap- tured and dragged by moving ... likely to be dif- ficult to discern after the fact. The need to make decisions in such a data- poor ... single year after which the area was not revis- ited. In contrast, core areas are repeatedly targeted ...

   Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 195–210 : Auteur(s): Sharp, B.R., S.J. Parker and N. Smith

2. Estimation of krill (Euphausia superba) mortality and production rate in the Antarctic Peninsula region

   Paper Title:  Estimation of krill (Euphausia superba) mortality and production rate in the ... Meteor along the Antarctic Peninsula from 26 December 1989 to 14 January 1990. Results were compared with ... ratio of 0.88 to 0.94 for different years. The exchange rate of water masses and krill biomass within ... biomass (including production) of 4.3 and 5.0 x 10 6 tonnes passing through the survey area during the ... biomass from the starting and the end of the cycle. Elimination is defined as the difference between ... (1971) was the first to calculate a ratio of PIB = 1.8 to 2.3 and stated the lower end of the range ... before and Z = 0.45 for the period after the reduction of the whale stock. The authors stated, however ... ) MORTALITY AND PRODUCTION RATE IN THE ANTARCTIC PENINSULA REGION V. Siegel* Abstract A net sampling ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 159–176 : Auteur(s): Siegel, V.

3. Intra-annual variability in the density of Antarctic krill (Euphausia superba) at South Georgia, 2002–2005: within-year variation provides a new framework for interpreting previous ‘annual’ estimates of krill density

   Paper Title:  Intra-annual variability in the density of Antarctic krill (Euphausia superba) at ... profilers (300 kHz) and echo sounders (125 kHz) were deployed on moorings on- and off-shelf to the northwest ... = 64.2). A sinusoidal regression model (period = 52 weeks) with time as the independent variable ... explained 64% of the observed week-to-week variation. Estimates of krill density from moored instruments ... using spherical trigonom- etry from the ADCP-derived GPS position for the start and end of each ... interac- tions around the western end of South Georgia. Document WG-EMM-99/17. CCAMLR, Hobart, Australia ... changes in krill density occurred after March and November, dividing the time series into three distinct ... . 14 (2007): 27–41 27 INTRA-ANNUAL VARIABILITY IN THE DENSITY OF ANTARCTIC KRILL (EUPHAUSIA SUPERBA ...

   Science Journal Paper : CCAMLR Science, Volume 14 (CCAMLR Science, Volume 14) : 27–41 : Auteur(s): Saunders, R.A., A.S. Brierley, J.L. Watkins, K. Reid, E.J. Murphy, P. Enderlein and D.G. Bone

4. Modelling catch and effort data using generalised linear models, the Tweedie distribution, random vessel effects and random stratum-by-year effects

   Paper Title:  Modelling catch and effort data using generalised linear models, the Tweedie ... distribution, random vessel effects and random stratum-by-year effects Abstract / Description:  The current ... CCAMLR areas is to model the haul-by-haul ratios of catch to effort as the response variable in a ... standardised CPUE estimates and their precision can be obtained from the ‘fishing year’ parameter estimates ... back- transforming the confi dence interval end-points using the inverse link function. Catch and ... Tweedie residuals, 100 random sets were gener- ated and after sorting each set in the order of the ... , with S-plus giving missing values for their coeffi cients. After setting the coeffi cients for these ... (2004): 59–80 59 MODELLING CATCH AND EFFORT DATA USING GENERALISED LINEAR MODELS, THE TWEEDIE ...

   Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 59–80 : Auteur(s): Candy, S.G

5. A possible framework in which to consider plausible models of the Antarctic marine ecosystem for evaluating krill management procedures

   Paper Title:  A possible framework in which to consider plausible models of the Antarctic marine ... management procedure for the krill fishery, including the evaluation of candidate management procedures in a ... simulation framework, using plausible models of the Antarctic marine ecosystem. This paper develops a ... framework for erecting such models. It discusses the general model requirements and presents a conceptual ... ‘drivers’, and (iii) the rates of mortality of taxa at the end of the food chains. For Antarctic marine ... (CCAMLR, 2002), to begin to review how the CCAMLR Ecosystem Monitoring Program could provide information ... to assist with manage- ment of the krill fi shery (SC-CAMLR, 2003), and now to begin to evaluate ... (2005): 99–117 99 A POSSIBLE FRAMEWORK IN WHICH TO CONSIDER PLAUSIBLE MODELS OF THE ANTARCTIC MARINE ...

   Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 99–117 : Auteur(s): Constable, A.J

6. A simulation study of the method of deriving natural mortality rate using data for Champsocephalus gunnari in Subarea 48.3

   Paper Title:  A simulation study of the method of deriving natural mortality rate using data for ... Champsocephalus gunnari in Subarea 48.3 Abstract / Description:  A method of determining the rate of natural ... mortality, based on the construction of a regression between the rate of annual fishing mortality ... (determined by VPA) and fishing effort is described. The intersect of this regression must be equal to zero if ... represented in the catch beginning from age ar is: ak F y = L Wa,y x F a,y a=a/ where Wa,y are weight ... WG-FSA-91/2S A SIMULATION STUDY OF THE METHOD OF ... and R.S. Dorovskikh* * Abstract A method of determining the rate of natural mortality, based on ... the construction of a regression between the rate of annual fishing mortality (determined by VPA ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 69–83 : Auteur(s): Gasyukov, P.S. and R.S. Dorovskikh

7. Assessing the power to detect systematic change in Adélie penguin foraging trip duration

   Paper Title:  Assessing the power to detect systematic change in Adélie penguin foraging trip ... variation was known to occur. Variability among trips and penguins was greater in the crèche stage, but ... variability among years was greater in the guard stage. Estimates of variability were used to explore the ... greater in the crèche stage than the guard stage. The gain obtained by increasing the number of penguins ... ‘ramp’ change in which there is a constant rate of increase for a number of years, after which the ... the guard and crèche stages respectively, (ii) an impact after a years causes either a step, ramp or ... model This model assumes a proportional increase in foraging trip duration in the years after an ... rate of change of P% (i.e. the proportionate increase, p = P/100) after an impact, the statistic t ...

   Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 201–215 : Auteur(s): Southwell, C., J. Clarke and L.M. Emmerson

8. By-catch, growth and feeding of Antarctic juvenile fish taken in krill (Euphausia superba Dana) fisheries in the South Georgia area, in 1992

   superba Dana) fisheries in the South Georgia area, in 1992 Abstract / Description:  This paper discusses ... an investigation of juvenile Antarctic fish caught during krill fishing by the FV Grigory Kovtun in ... the area around South Georgia from May to July 1992. Two species were predominant in the by-catches ... : Champsocephalus gunnari and Nototheniops larseni. The frequency of occurrence of juvenile fish was 18.2% when all ... stomachs were measured (euphausiids: from the tip of the rostrum to the end of telson) and weighed. The ... ., 1978; North and Ward, 1990). After leaving the fjords, they change their diet to E. superba ... FEEDING OF ANTARCTIC JUVENILE FISH TAKEN IN KRILL (EUPHAUSIA SUPERBA DANA) FISHERIES IN THE SOUTH GEORGIA ... caught during krill fishing by the FV Grigoy Kovtun in the area around South Georgia from May to July ...

   Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 129–142 : Auteur(s): Pakhomov, E.A. and S.A. Pankratov

9. Observation of seabirds in the Southern Ocean in 1988/89

   Paper Title:  Observation of seabirds in the Southern Ocean in 1988/89 Abstract / Description ... :  This paper examines the numerical and species distribution of birds in the sub-Antarctic area of the ... Southern Ocean to the south of 60°S. Thirty minute observations were made daily during daylight hours at 8 ... ports of call. Maps summarize the distribution of 14 bird species as well as of the individual species ... visibility, type of precipitation and ice cover, which have a direct impact on bird behaviour. At the end of ... (Figure 8) after which it was sporadically sighted in Prydz Bay and in the area of Mirny Station (Figure ... WG-CEMP-90/33 OBSERVATION OF SEABIRDS IN THE SOUTHERN ... OCEAN IN 1988/89 A.V. Vagin and V.V. Popov* * Abstract This paper examines the numerical and ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 521–542 : Auteur(s): Vagin, A.V. and V.V. Popov

10. Observations on haul-out patterns and trends in the breeding populations of southern elephant seal at Península Valdés (Patagonia) and Stranger Point (25 de Mayo - King George I.)

    Paper Title:  Observations on haul-out patterns and trends in the breeding populations of southern ... de Mayo-King George I. were studied during the breeding season from 1979 to 1987. Two main objectives ... were taken into consideration: haul-out pattern and the female population trend. In both places, the ... intrinsic population growth rate is positive. In 1982, at Stranger Point, a sharp decrease of the female ... second one was included because after the breeding season, females from Peninsula Valdes go to the ... the basis of a single census, at Stranger Point this should be carried out after the 30/10 (27/10 ... plus the 3-days rank), and at Peninsula Valdes after the 5/10 (30/9 plus 5-days rank). Here the ... places after the breeding season have been confirmed with male of elephant seal from Kerguelen to ...

    Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 453-463 : Auteur(s): Vergani, D.F., M.N. Lewis and Z.B. Stanganelli

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