Résultats de la recherche
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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
of that kind. The present study attempts to implement this estimator in the form of a parametric ... Abstract: In addition to a review of published studies on Adelie penguin abundance at breeding ... uncertainty at breeding sites in Antarctica. To achieve this task, a menu-driven suite of routines titled ... SEABIRD (Seasonal Estimation of Abundance by Bootstrapping Inexact Research Data) has been developed in ...
Meeting Document : WG-EMM-PSW-08/11 : Auteur(s): J.P. McKinlay and C.J. Southwell (Australia)
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IDENTIFICATION OF DATA QUALITY METRICS FOR TAGGING DATA SELECTION
. These include metrics for taxonomic resolution in the observer data, goodness of fit of catch data to ... Benford's Law, and the variation in toothfish catch rates.This reduced set of data quality metrics ... could be helpful in the identification of trips which have similar data quality to the known “good data ... ” trips, but where, due to heterogeneity in the stock and in the spatial and temporal distribution of ...
Meeting Document : WG-SAM-09/19 : Auteur(s): D.A.J. Middleton and A. Dunn (New Zealand)
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Pup production and distribution of breeding Antarctic fur seals (Arctocephalus gazella) at South Georgia
the rate of increase in pup production has declined since the initial period of population expansion ... in the 1950s and 1960s. Increased population size has led to an expansion of the breeding range at ... Abstract: A census of the breeding population of Antarctic fur seals (Arctocephalus gazella) at ... South Georgia was carried out during the 1990/91 breeding season. Using counts of adult females ashore ...
Meeting Document : WG-CEMP-92/39 : Auteur(s): I.L. Boyd (United Kingdom)
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Otolith elemental signatures reveal habitat shift of Electrona carlsbergi
the biological data in 1990s, however, the habitat shift of this species was still unclear. The ... waters of sub-Antarctic zone and spend the first year of life in this region. Those individuals move ... to test habitat shift and life history processes of fish species in the Southern Ocean. Moreover ... which circumpolar distributed between the warm waters of the subtropical confluence zone and the ...
Meeting Document : WG-FSA-17/65 : Auteur(s): L. Wei and G.P. Zhu
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Power analyses of CEMP indices for penguins at Admiralty Bay and fur seals at Cape Shirreff and Seal Island
probability of rejecting the null hypotheses when they were, in fact, true), three periods of monitoring, and ... 21 levels of annual percent change in the CEMP indices. We conducted a number of “combined analyses ... type of overall trend. We displayed the results of our analyses in a tabular format designed to ... Abstract: We used the program MONITOR to conduct a set of power analyses for CEMP indices ...
Meeting Document : WG-EMM-03/52 : Auteur(s): G.M. Watters, R.P. Hewitt, W.Z. Trivelpiece and M.E. Goebel (USA)
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Dietary segregation of krill-eating South Georgia seabirds
ranges. selectivity by predators, or differences in escape responses of krill. For the krill-eating ... Abstract: The diets of six of the main seabird species (two petrels, two albatrosses, two ... period in 1986. For five species, Antarctic krill Euphausia superba was the main food (39-98% by mass ... . The size of the krill taken was similar between seabird species, although there were small but ...
Meeting Document : WG-EMM-97/15 : Auteur(s): Prince, P.A., Croxall, J.P., Reid, K.
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Diets of Antarctic toothfish estimated from fatty acids and stable isotopes
the particular importance of accumulation of lipid deposits in their tissue. Toothfish trophic niche ... whole population level. In contrast, the model calculations provided an estimation of dietary shift ... Antarctic toothfish, by-catch and their stomach contents were collected for the past five years in the eight ... locations of he Antarctic Waters. We investigated ontogenetic and spatial variability in resource ...
Meeting Document : WG-FSA-17/12 : Auteur(s): C.-K. Kang, S.-G. Choi, J. Lee, J. Lee and D. An
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An exact time of release and recapture stock assessment model applied to Macquarie Island Patagonian toothfish (Dissostichus eleginoides)
released fish is assigned a length of time in the available population according to its estimated release ... Abstract: This paper presents an assessment of the harvested population of Patagonian toothfish ... , catches, recaptures, natural mortality, and annual net recruitment are used to assess the population of ... one of the main fishing regions of Macquarie Island: Aurora Trough. The pre-tagging abundance is ...
Meeting Document : WG-FSA-00/43 : Auteur(s): G. Tuck, W. de la Mare, W. Hearn, R. Williams, A. Smith, X. He and A. Constable (Australia)
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Time series of Drake Passage Oscillation Index (DPOI) from 1952 to 2006, Antarctica
Abstract: An assessment of the environmental processes influencing variability in the recruitment ... krill recruitment and density in the Antarctic Peninsula area with an environmental factor; strength of ... and density of Antarctic krill (Euphausia superba DANA) is important as variability in krill stocks ... affects the Antarctic marine ecosystem as a whole. Naganobu et al. (1999) had assessed variability in ...
Meeting Document : WG-EMM-06/13 : Auteur(s): M. Naganobu and K. Kutsuwada (Japan)
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DEVELOPMENT OF A METHODOLOGY FOR DATA QUALITY ASSESSMENT
biological sampling data from a fishing trip. In particular these measures aim to quantify the prevalence of ... in the quality of particular data sets from different trips in the Ross Sea Antarctic toothfish ... Abstract: Measures are developed which aim to summarise the quality of fishing event, catch, and ... position or time reporting errors, the diversity of catch, the extent to which catch data follow Benford ...
Meeting Document : WG-SAM-08/13 : Auteur(s): D.A.J. Middleton and A. Dunn (New Zealand)