Résultats de la recherche

1. SEASONAL ESTIMATION OF ABUNDANCE BY BOOTSTRAPPING INEXACT RESEARCH DATA (SEABIRD): A METHOD FOR ASSESSING ABUNDANCE AND UNCERTAINTY FROM HISTORICAL COUNT DATA USING ADELIE PENGUINS AS A CASE STUDY

   Abstract:  In addition to a review of published studies on Adelie penguin abundance at breeding ... sites in Antarctica, Southwell (2004) proposed a general abundance estimator appropriate for a species ... of that kind. The present study attempts to implement this estimator in the form of a parametric ... uncertainty at breeding sites in Antarctica. To achieve this task, a menu-driven suite of routines titled ...

   Meeting Document : WG-EMM-PSW-08/11 : Auteur(s): J.P. McKinlay and C.J. Southwell (Australia)

2. A sensitivity analysis of a simple krill individual-based model designed to investigate length-based recruitment indices

   LFDs: growth, mortality and recruitment. Understanding how these processes interact is a prerequisite ... to the interpretation of any observed trend. To illustrate these interactions a simple mechanistic ... individual-based model of krill population dynamics was subjected to a sensitivity analysis. Starting from a ... , since the population size structure at a given time is the result of a mixture of several annual cohorts ...

   Meeting Document : WG-EMM-13/23 : Auteur(s): S. Thanassekos and K. Reid (Secretariat)

3. Developing and applying a general abundance estimator for land-based predator surveys: Adélie penguins as a case study

   Abstract:  The development of a general estimator of abundance would facilitate a standardised ... approach to regional and circum-Antarctic surveys of land-based predators. Such a generalised estimator is ... abundance of Adélie penguins at regional scales in Antarctica, given a range of logistical scenarios and ... related survey designs. Author(s):  C. Southwell (Australia) Title:  Developing and applying a general ...

   Meeting Document : WG-EMM-04/56 : Auteur(s): C. Southwell (Australia)

4. A revised estimate of short-term yield for the mackerel icefish (Champsocephalus gunnari) off Heard Island based on a trawl survey in 1998

   Abstract:  A random stratified trawl survey of Mackerel icefish in 2 populations (Plateau and ... Shell Bank) in the vicinity of Heard Island enabled a revised estimate of yield for the coming 2 seasons ... cohorts are still sufficiently strong to provide for a yield greater than estimates of the long term ... estimate of a long term precautionary level and be maintained thereafter unless a further survey again ...

   Meeting Document : WG-FSA-98/54 : Auteur(s): A. Constable and D. Williams (Australia)

5. Further computations of the consequences of setting the annual krill catch limit to a fixed fraction of the estimate of krill biomass from a survey

   Abstract:  The results of Butterworth et al. (1991) relating potential krill yield to a pre ... on Krill. The most important of these extensions is integration over the ranges of uncertainty for a ... below various fractions of its median pre-exploitation level, as a function of the fraction of the ... biomass estimate which is set as the catch for a 20-year period. Three alternative fishing seasons are ...

   Meeting Document : WG-KRILL-92/04 : Auteur(s): D.S. Butterworth, G.R. Gluckman and S. Chalis (South Africa)

6. A brief review of information relevant to the establishment of a Krill Research Zone within the proposed Ross Sea Region Marine Protected Area

   Resources meeting in 2015, New Zealand and the United States introduced a revision to the proposed Ross Sea ... Region Marine Protected Area (RSRMPA) that included the addition of a Krill Research Zone (KRZ). A ... central aim of the proposed KRZ is to enhance research opportunities within the RSRMPA. To provide a ... , focusing primarily on krill and krill-dependent predators. Here we provide a summary of that review, which ...

   Meeting Document : WG-EMM-16/49 : Auteur(s): E.S. Klein and G.M. Watters

7. A nonparametric algorithm to model movement between polygon subdomains in a spatially explicit ecosystem model

   part of the modelling effort. In marine applications, a flow field grid describing the water movement ... large computational costs and difficult communication between model layers. In this paper, a simple and ... biomass distribution in comparison to a grid-scale model. A nonparametric description of inter-polygon ... both in artificial and realistic scenarios. Author(s):  T. Lenser and A. Constable (Australia) Title ...

   Meeting Document : WG-EMM-06/35 : Auteur(s): T. Lenser and A. Constable (Australia)

8. The error of the biomass estimate as a function of survey parameters and the statistics of a density field of krill aggregations

   estimate (by means of a survey) on statistical characteristics of fish concentration density field under ... methods of calculus of probabilities; biomass estimate is determined as a product of average density for ... a posteriori estimation of error made when calculating biomass, and for survey planning on the basis ... of a priori estimates of statistical characteristics of concentration density field. They might make ...

   Meeting Document : SC-CAMLR-VI/BG/39 : Auteur(s): Z.I. Kizner (USSR)

9. A survey of fish stocks in the Heard Island and McDonald Islands region in the 1999/2000 season and a comparison of the abundances of selected species with those obtained in previous surveys

   Abstract:  A random stratified trawl survey was conducted in May 2000 to assess the abundance of ... stratum. A total of seven surveys have been conducted in the Heard Island and McDonald Islands region ... , varying by a factor of 2-3 between years, but C. gunnari abundance can vary by a factor of about 20 ... . Author(s):  R. Williams, A. Constable, T. Lamb and E. van Wijk (Australia) Title:  A survey of fish ...

   Meeting Document : WG-FSA-00/40 : Auteur(s): R. Williams, A. Constable, T. Lamb and E. van Wijk (Australia)

10. Further computations of the consequences of setting the annual krill catch limit to a fixed fraction of the estimate of krill biomass from a survey

    Abstract:  The results of Butterworth et al. (1992) relating potential krill yield to a pre ... integration over the ranges of uncertainty for a number of the model parameters. Results are provided for the ... a function of the fraction of the biomass estimate which is set as the catch for a 20-year period ... preferable to a summer harvest. However, the imposition of an upper-bound of 1.5 yr-1 on the effective annual ...

    Meeting Document : WG-KRILL-93/42 : Auteur(s): D.S. Butterworth, G.R. Gluckman, R.B. Thomson and S. Chalis (South Africa)

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