Résultats de la recherche
-
An interlaboratory comparison of ages estimated for Dissostichus eleginoides from the Argentine Sea, southwest Atlantic Ocean
Abstract: To examine consistency among laboratories in age estimation of Patagonian toothfish and ... 124 fishes caughts in Argentine Sea (South West Atlantic) Ages were estimated by readers from National ... a clearer section. More hyaline bands were visible in the NIWA preparations, particularly near the ... otoliths could not be classified as easy to read, the clarity of their zones is quite similar in the South ...
Meeting Document : WG-FSA-04/45 : Auteur(s): M.C. Cassia (Argentina), P.L. Horn (New Zealand) and J.R. Ashford (USA)
-
An ecosystem-based approach to management: using individual behaviour to predict the indirect effects of Antarctic krill fisheries on penguin foraging
Abstract: 1. Changes in species’ abundance and distributions caused by human disturbances can ... have indirect effects on other species in a community. Although ecosystem approaches to management are ... conditions on these interactions. In this study, we extended a behavioural model used previously to ... penguin foraging success and behaviour in adjacent breeding sites. 3. Increased fishing pressure offshore ...
Meeting Document : WG-EMM-03/34 : Auteur(s): S.H. Alonzo, P.V. Switzer and M. Mangel (USA)
-
Short note: time series of Drake Passage Oscillation Index (DPOI) from 1952 to 1988
Abstract: Naganobu et al. (1999) had assessed variability in krill recruitment and density with ... differences across the Drake Passage, sea ice cover and chlorophyll-a in the Antarctic Peninsula area during ... westerlies were especially regarded as a key environmental index. Fluctuations in the westerlies across the ... variability. High DPOI periods, not less than 16 hPa, were mostly observed in the period before 1964 and only ...
Meeting Document : WG-EMM-02/44 : Auteur(s): M. Naganobu and K. Kutsuwada (Japan)
-
Predation on fish by the southern elephant seal, Mirounga leonina, at King George Island, South Shetland Islands, as reflected by stomach lavage
, were stomach lavaged at King George Island in order to analyse their diet. The two major prey types ... were cephalopods and fish which ocurred respectively in 98,1% and 14% of stomachs containing prey ... nicholsi which constituted in number 69% of the otoliths found. This species was followed by the ... nototheniid Pleuragramma antarcticum which represented 11,7% in number and 31,3% in frequency of occurrence ...
Meeting Document : WG-EMM-01/58 : Auteur(s): G.A. Daneri and A.R. Carlini (Argentina)
-
An exact time of release and recapture stock assessment model applied to Macquarie Island Patagonian toothfish (Dissostichus eleginoides)
estimated by incorporating a Petersen approach in a novel semi-parametric model using maximum likelihood ... released fish is assigned a length of time in the available population according to its estimated release ... abundance remaining in Aurora Trough was about 35% in the base-case model. In general, the selectivity model ... substantial decline in available abundance predicted by both models provides some evidence of large-scale ...
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)
-
PREDICTING SPECIES DISTRIBUTIONS FROM MUSEUM AND HERBARIUM RECORDS USING MULTI-RESPONSE MODELS FITTED WITH MULTIVARIATE ADAPTIVE REGRESSION SPLINES
methods for using these data. Such methods must, in particular, accommodate the difficulties caused by ... models (GAMs) that are commonly and successfully used in modelling species distributions, but has ... particular advantages in its analytical speed and the ease of transfer of analysis results to other ... dominant environmental drivers of variation in species composition. We use data from 226 species from six ...
Meeting Document : WS-VME-09/P02 : Auteur(s): Elith, J., Leathwick, J.
-
Population demography of Antarctic fur seals: the costs of reproduction and implications for life-histories
Abstract: 1. This study examined the costs of reproduction in terms of future survival and ... reproduction in female Antarctic fur seals from Bird Island, South Georgia. It used mark-recapture data from 11 ... . 2. Population age structures were used, in conjuction with the measured age-specific survival rates ... result of pregnancy which accounted for 40–50% of adult female mortality. This effect was greatest in the ...
Meeting Document : WG-EMM-95/26 : Auteur(s): Reid, K., Croxall, J.P., Lunn, N.J., Boyd, I.L.
-
Developing a Ross Sea region medium-term data collection plan
Abstract: Data are collected for use in scientific research, the results of which are used to ... , prevention of changes or minimisation of the risk of changes in the marine ecosystem which are not ... of Antarctic marine living resources. Based on these goals and previous experience in the fishery ... , proposed medium term research objectives for the Ross Sea fishery for the next 5–7 years were developed in ...
Meeting Document : WG-FSA-10/32 : Auteur(s): S. Mormede and S. Hanchet (New Zealand)
-
Fisheries risks to the population viability of black petrel (Procellaria parkinsoni)
1.2% and 3.1% per year. Mark-recapture data were useful in estimating demographic parameters, like ... spend an average of 1.2 y in the colony as pre-breeders, with only 3% skipping the pre-breeder phase. Of ... birds that appear in the study area as pre-breeders and survive to breed, only 68% do so in the study ... well determined because we can’t distinguish mortality from emigration (birds that breed in an area ...
Meeting Document : WG-SAM-10/P01 : Auteur(s): R.I.C.C. Francis and E.A. Bell (New Zealand)
-
Distribution and ecology of Chaenocephalus aceratus (Channichthyidae) around South Georgia and Shag Rocks (Southern Ocean).
demersal fish living on the South Georgia shelf where it is caught in low numbers as by-catch in the ... that growth was fast in the first five years with males and females attaining lengths at first spawning ... in diet from Euphausia superba and mysids to benthic fish and decapods observed to begin at 250 mm TL ... . In larger fish (> 500 mm TL) the diet was dominated by fish. C. aceratus diet is sufficiently ...
Meeting Document : WG-FSA-07/P5 : Auteur(s): W.D.K Reid, S. Clarke, M.A. Collins and M. Belchier. (Polar Biol., 30 (12): 1523–1533 (2007))