Resultados de la búsqueda
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ANALYSIS OF KRILL OBSERVER COVERAGE IN SUBAREA 48.3
been implemented since 2002. Observers have been placed on approximately 50% of vessels fishing in any ... one season, and have been present on board for about 30% of the fishing season. They have achieved a ... rate of sampling equivalent to 18% of total hauls taken in a season being sampled for krill and 11% for ... variance, the between vessel variance being about 45% of total variance. However, the ratio is sufficiently ...
Meeting Document : WG-EMM-09/25 : Autor(es): D.J. Agnew, P. Grove, T. Peatman, R. Burns and C. Edwards (United Kingdom)
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RESPONSE OF ANTARCTIC BENTHIC COMMUNITIES TO DISTURBANCE: WRST RESULTS FROM THE ARTIWCIAL BENTHIC DISTURBANCE EXPERIMENT ON THE EASTERN WEDDELL SEA SHELF, ANTARCTICA
simulate the impact of grounding icebergs on the seabed and follow the steps and timescales of recovery of ... this experimental field study. By means of 11 densely-placed hauls with a modified bottom trawl, a ... seabed area of approximately 100 x 1000 m was artificially scoured to inflict a similar damage to the ... drastically reduced by a factor of 10, while mean abundances were only slightly reduced. Demersal fish biomass ...
Meeting Document : WS-VME-09/P05 : Autor(es): Rossi, S., Mintenbeck, K., Knust, R., Isla, E., Gerdes, D.
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Net sample validation of acoustic techniques used to identify and size Antarctic krill
identified and distinguished from all other types of backscatter. Traditionally this has been achieved by ... sampling characteristic types of acoustic target with nets. More recently partitioning of backscatter into ... the functionality of acoustic target identification techniques. Mean volume backscattering strength ... collected with an RMT8. Around 80 % of the targets thought to be krill on the basis of their appearance on ...
Meeting Document : WG-EMM-97/46 : Autor(es): Watkins, J.L., Brierley, A.S.
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Population dynamics of wandering albatross Diomedea exulans and Amsterdam albatross D. amsterdamensis in the Indian Ocean and their relationships with longline fisheries: conservation implications
1986 have shown slow recovery. The population of the endangered Amsterdam albatross Diomedea ... study of the Crozet population indicates that the earlier decline was mainly the result of increased ... adult mortality, and secondarily of low recruitment. Satellite tracking studies of breeding birds and ... band recoveries of non breeding birds indicate that during and outside the breeding season these ...
Meeting Document : WG-FSA-96/09 : Autor(es): Jouventin, P., Brothers, N., Weimerskirch, H.
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Population change in gentoo penguins Pygoscelis papua at South Georgia: potential roles of adult survival, recruitment and deferred breeding
survival and recruitment rates, to model the fluctuations in breeding populations, taking account of ... variations introduced by good and bad years (as classified on the basis of breeding success). There is ... major population changes (large decreases followed by substantial increases) occurred. Three of these ... years were associated with reduced availability of krill, one with very cold winter and spring ...
Meeting Document : WG-CEMP-93/08 : Autor(es): J.P. Croxall and P. Rothery (United Kingdom)
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Apparent decrease of Weddell seal numbers in the western Ross Sea
Edisto-Moubray as well. The timing of decline, or perhaps spreading (low numbers of seals in more places ... . We analyzed both historic and satellite-derived ice data but found only an expansion of pack ice in ... the larger region and a thinning of fast ice along Victoria Land (conceivably beneficial to seals ... ). Timing of freeze and breakup of the fast ice remains the same. The only other major change to the Ross ...
Meeting Document : WG-EMM-14/44 : Autor(es): D.G. Ainley, M.A. Larue (USA), I. Stirling (Canada), S. Stammerjohn and D.B. Siniff (USA)
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Incorporation of science advice from the CCAMLR working groups and Scientific Committee into the krill assessment model for Subarea 48.1
series of papers and presentations to WG-EMM, WG-FSA and WG-SAM from 2011 to 2016. The full text of the ... during that period is included as an Appendix to this document. The purpose of this paper is to summarize ... date along with a description of how the model has incorporated those suggestions, and to obtain advice ... from WG-SAM regarding whether the parameter estimation portion of the current model appears mature ...
Meeting Document : WG-SAM-17/32 : Autor(es): D. Kinzey, G.M. Watters and C.S. Reiss
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On the use of baited remote underwater video to study Antarctic toothfish distribution under the sea-ice: from data collection to processing
spreadtime series of data to study the Antarctic toothfish, it is limited to areas where commercial fishing ... is permitted either by management or vessel operational constraints. The use of Baited Remote ... and Italy, from 2015 to 2018 a series of BRUV samplings have been carried out from the fast ice of ... of predictive variables, including an approach to account for bias in counting the number of ...
Meeting Document : WG-EMM-2019/50 : Autor(es): D. Di Blasi, S. Canese, E. Carlig, L. Ghigliotti, S.J. Parker and M. Vacchi
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Short note: time series of Drake Passage Oscillation Index (DPOI) from 1952 to 1988
hypothesized environmental factors; strength of westerly winds (westerlies) determined from sea-level pressure ... series of DPOI using historical data. We searched the historical data and found the time series since the ... 1950s until 1988 at the Web sites of the Carbon Dioxide Information Analysis Centre for Rio Gallegos and ... of DPOI from 1952 to 1988 at this stage. Time series since 1988 will be soon calculated after ...
Meeting Document : WG-EMM-02/44 : Autor(es): M. Naganobu and K. Kutsuwada (Japan)
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IN SITU MEASUREMENTS OF TILT ANGLE DISTRIBUTION AND TARGET STRENGTH IN ANTARCTIC KRILL (EUPHAUSIA SUPERBA)
Abstract: Knowledge of the scattering properties of Antarctic krill (Euphausia superba) is ... crucial for biomass estimates of the species, but in situ investigations regarding this are still very ... scarce. We conducted a field study in the Southern Ocean where one of the objectives was to acquire data ... on orientation angles and target strength of Antarctic krill. The main investigations were done off ...
Meeting Document : WG-EMM-08/29 : Autor(es): G. Skaret, S.A. Iversen, T. Knutsen, R.J. Korneliussen, E. Ona, R. Pedersen, A. Totland, T. Torkelsen (Norway) and X. Zhao (China)