Résultats de la recherche
-
Towards the development of a management plan for mackerel icefish (Champsocephalus gunnari) in Subarea 48.3
Paper Title: Towards the development of a management plan for mackerel icefish (Champsocephalus ... gunnari) in Subarea 48.3 Abstract / Description: Management of the mackerel icefish (Champsocephalus ... gunnari) at South Georgia is complicated by the likelihood of substantial periodic variations in natural ... outlines a scheme which would use information from studies on krill and predators undertaken as part of the ... median level at the end of the run. Detailed examination of stock trajectories indicated that most of ... median SSB at the end of the 10-year fishing period is 75% of the median in the absence of exploitation ... the ratio of the median stock biomass after exploitation to the median stock biomass in the absence ... CCAMLR Science, Vol. 5 (1998): 63-77 TOWARDS THE ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 63–77 : Auteur(s): Agnew, D.J., I. Everson, G.P. Kirkwood and G.B. Parkes
-
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
-
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.
-
Zooplankton: Trophic modelling of the Ross Sea
Description / Abstract: A supporting document to the CCAMLR Science paper: M.H. Pinkerton, J.M ... . Bradford-Grieve and S.M. Hanchet. 2010. A balanced model of the food web of the Ross Sea, Antarctica ... towards the low end of E. superba densities in the Southern Ocean. 3.3 Food and condition For the ... value at the higher end of that of krill, i.e. 2.0 y-1, with a range of 1–4 y-1. 10 4.3 Diet ... value at the upper end of the possible range of values found for krill in Antarctic waters, of Q/B=15 y ... 2000 m (Marr 1962). After hatching, larvae develop as they ascend the water column and arrive near the ...
Document : Site Section: Publications
-
Bacteria and detritus: Trophic modelling of the Ross Sea
Description / Abstract: A supporting document to the CCAMLR Science paper: M.H. Pinkerton, J.M ... . Bradford-Grieve and S.M. Hanchet. 2010. A balanced model of the food web of the Ross Sea, Antarctica ... important biological process supplying sinking organic particles to the sea floor at that time. At the end ... export in autumn 1.5 months after the ice started to form. The correlation of this event with ... autumn just after the diatom pulse. It is thought that this pulse represents the die-out of this ... modelling of the Ross Sea M.H. Pinkerton, J. Bradford-Grieve National Institute of Water and ...
Document : Site Section: Publications
-
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
-
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
-
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
-
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
-
Information Note for the Spatial Management Workshop and WG-EMM
This information note covers the following meetings to be held at the British Antarctic Survey ... Group on Ecosystem Monitoring and Management (WG-EMM) from 9 to 13 July 2018. Venue The CCAMLR Spatial ... Management Workshop and the CCAMLR Working Group on Ecosystem Monitoring and Management will both be held in ... the Aurora Innovation Centre at the British Antarctic Survey, High Cross, Madingley Road, Cambridge ...
Page : Site Section: Meetings