Résultats de la recherche
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A RE-ANALYSIS AND UPDATE OF THE ANTARCTIC KRILL BIOMASS IN THE SOUTH SHETLAND ISLANDS, THROUGH 2011
Abstract: Acoustically based estimates of Antarctic krill (Euphausia superba) biomass, and net ... -based estimates of krill density and recruitment are recalculated for the years 1996 through 2011 ... . The time series of acoustic biomass indicate that krill have varied by more than an order of magnitude ... based data show that 2011 was a year of good recruitment, following two years of low recruitment. Krill ...
Meeting Document : WG-EMM-11/26 : Auteur(s): A. Cossio, C. Reiss and R. Driscoll (USA)
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Are penguins and seals in competition for Antarctic krill at South Georgia?
consumers of Antarctic krill. In recent years the population of fur seals has increased whereas that of ... macaroni penguins has declined. Both species feed on krill of similar size ranges, dive to similar depths ... prevalence of krill in the diet of the two predators differed with less krill in the diet of macaroni ... penguins than Antarctic fur seals in recent years. Krill in the diet of macaroni penguins was significantly ...
Meeting Document : WG-EMM-01/22 : Auteur(s): K.E. Barlow, I.L. Boyd, J.P. Croxall, I.J. Staniland, K. Reid and A.S. Brierley (United Kingdom)
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A revised assessment of the impact of the krill fishery on penguins in the South Shetlands
krill (Euphausia superba) fishery and penguins (WG-Krill-93/7). Main fishing areas were confined to the ... with areas of high krill abundance. The overlap between trawling depth and foraging dive depth of ... penguins was also insignificant. Furthermore, less similarity between krill caught by trawlers and those ... fishery and penguins. Krill biomass was estimated to be as large as 200-1500 xl03 tonnes within the ...
Meeting Document : WG-Joint-94/17 : Auteur(s): T. Ichii, M. Naganobu and T. Ogishima (Japan)
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Analysis of krill fishery operations in Subarea 48.1: spatial-time distribution of CPUE and fishing efforts
krill fishery data for understanding reasons of this ‘high CPUE’ regime. The authors present the ... analysis of spatial- temporal variability of krill fishery based on CPUE trends, trawling duration, catch ... become the reason for the changes in sea ice locations and krill abundance and distribution affecting ... observed in long-term fishery. We suggest that information on variability of krill fishable biomass ...
Meeting Document : WG-EMM-14/21 : Auteur(s): S. Kasatkina and P. Gasyukov (Russia)
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An assessment of the use of ocean gliders to undertake acoustic measurements of zooplankton: the distribution and density of Antarctic krill in the Weddell Sea
the distribution of Antarctic krill (Euphausia superba). During the glider missions, a research vessel ... taken to validate acoustic targets and parameterize acoustic models. Krill targets were identified using ... a thresholded schools analysis technique (SHAPES), and acoustic data were converted to krill density ... density estimates by up to 8-fold. Glider-based, echo-sounder–derived krill density profiles for the two ...
Meeting Document : WG-EMM-14/P02 : Auteur(s): D. Guihen, S. Fielding, E. Murphy, K. Heywood and G. Griffiths
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Estimating future krill catches that meet the CCAMLR and alternative decision rules for FAO Subarea 48.1 using an integrated assessment model
Abstract: An integrated assessment model for Antarctic krill in FAO Subarea 48.1 that ... incorporates catch and length-composition data from the krill fishery with biomass indices and length ... estimate the effects of the fishery on the krill population. The model estimates parameters representing ... krill population biology and the fishery during the period with data (1976 to 2014 in these models) and ...
Meeting Document : WG-EMM-15/51 Rev. 1 : Auteur(s): D. Kinzey, G.M. Watters and C.S. Reiss (USA)
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Krill consumption by crabeater seals in CCAMLR Divisions 58.4.1 and 58.4.2
Abstract: As a contribution to the work program of WG-EMM-STAPP to estimate krill consumption by ... predators, this paper presents estimates of krill consumption by crabeater seals off East Antarctica between ... 64ºE-150ºE, which includes all of Division 58.4.1 and part of Division 58.4.2. Krill consumption by ... . This represents approximately 20% of the krill biomass estimated from acoustic surveys. Author(s): C ...
Meeting Document : WG-EMM-16/66 : Auteur(s): C. Southwell, J. Forcada, L. Emmerson, A. Constable, S. Kawaguchi and P. Trathan
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Describing krill: swarms or integration intervals?
Abstract: CCAMLR anticipates that acoustic data collected from krill fishing vessels will be ... incorporated into krill feed back management. Acoustic data collected from fishing vessels may have different ... may contain seabed aliased echoes and instrument cross-talk. Analysing acoustic data on a krill-swarm ... estimated mean areal krill density for a small (65 km by 60 km) survey conducted in the waters off Mawson ...
Meeting Document : SG-ASAM-17/02 : Auteur(s): M.J. Cox
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Distribution and size-age composition of Antarctic krill in the South Orkney Islands region (CCAMLR Subarea 48.2)
Abstract: This paper describes distribution and size-age composition of Antarctic krill ... /2009 and 2009/2010 seasons. All age cohorts of krill passed spawning during the season 2008/2009, while ... in anomalous cold 2009/2010 season significant proportion of krill of cohort 2+ skipped spawning ... . Individuals of Antarctic krill in age 1+ were absent in catches in both 2008/2009 and 2009/2010 seasons ...
Meeting Document : WG-EMM-10/16 : Auteur(s): D.O. Sologub and A.V. Remeslo (Russia)
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Estimating Antarctic krill density from multi-beam observations using distance sampling methods
processing of acoustic data from fishing vessels. Some krill fishing vessels are equipped with scanning or ... sampling theory- that provides a general means for estimating krill density and biomass from vertically ... constraints of krill target strength models, acoustic instrument stability, and survey design allow the use of ... data observed with horizontally oriented multi-beam and scanning sonars to contribute to krill ...
Meeting Document : SG-ASAM-12/05 : Auteur(s): M.J. Cox (Australia)