Search results
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Stable isotope analysis reveals trophic variation in adult Antarctic krill (Euphausia superba) around the Antarctic Peninsula from austral fall to early winter
variation existed at the onset of winter, and the δ 15 N values were not significant different during this ... ecosystem and an important link in the food web of the Antarctic ecosystem. The trophic information for this ... of both spatial and temporal variables. We investigated the size dependence and monthly and regional ... variation in δ 13 C and δ 15 N values of adult krill in the Antarctic Peninsula, in the austral fall (April ...
Meeting Document : WG-EMM-2019/P03 : Author(s): H.T. Zhang, G.P. Zhu, Q. Song, S.Q. Wang, Y. Yang and Q.Y. Yang
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Conflict or co-existence? Foraging distribution and competition for prey between Adélie and chinstrap penguins
, their foraging distribution and diet were studied during the chick-rearing period at Signy Island, South ... Orkney Islands during the breeding seasons of 2000 and 2001. Satellite tracking data from of 19 Adélie ... penguins and 24 chinstrap penguins were used to compare foraging distributions. In both years the diet of ... both species was exclusively Antarctic krill (Euphausia superba) of the same size range. In a year of ...
Meeting Document : WG-EMM-02/15 : Author(s): A.S. Lynnes, K. Reid, J.P. Croxall and P.N. Trathan (United Kingdom)
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Research plan for toothfish in Division 58.4.4a & b by Shinsei Maru No. 3 in 2013/14
Abstract: We made stock status assessments of Dissostichus eleginoides in SSRUs C and D in ... stating that the sensitivity run of the CASAL model should be made by using levels of IUU ranging from ... CASAL_base model includes estimated variability of YCS for the period from 1989 to 2005, and assumed that a ... quarter of observed IUU fishing in the division had occurred in SSRU C. High estimated stock levels were ...
Meeting Document : WG-SAM-13/21 : Author(s): Delegation of Japan
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A critical re-examination of the evidence for a possible dependence of Weddell seals (Leptonychotes weddellii) on Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea, Antarctica
(Dissostichus mawsoni; ‘toothfish’) in the Ross Sea may affect the ecological viability of top predators such as ... Weddell seals (Leptonychotes weddellii), but available evidence remains inconclusive as a result of both ... the assumptions underlying application of stable isotope methodology to Weddell seals, and estimate ... the potential contribution of toothfish to the diet of Weddell seals using an isotope mixing model ...
Meeting Document : WG-EMM-13/28 : Author(s): R. Eisert, M.H. Pinkerton (New Zealand), S.D. Newsome and O.T. Oftedal (USA)
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Assessment models for Antarctic toothfish (Dissostichus mawsoni) in Subarea 88.2 SSRUs 88.2C–G for the years 2002–03 to 2010–11
are caught and most of the effort has been concentrated. For our reference case we used a selected trips data ... fishery, and (iii) tag data from all trips. The inclusion of the unaccounted mortality from lost gear had ... are caught and most of the effort has been concentrated. For our reference case we used a selected trips data ... fishery, and (iii) tag data from all trips. The inclusion of the unaccounted mortality from lost gear had ...
Meeting Document : WG-FSA-11/43 : Author(s): S. Mormede, A. Dunn and S.M. Hanchet (New Zealand)
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Precautionary spatial protection to facilitate the scientific study of habitats and communities under ice shelves in the context of recent, rapid, regional climate change
the Antarctic Peninsula region. One of the most evident signs of climate change has been ice shelf ... collapse; overall, 87% of the Peninsula’s glaciers have retreated in recent decades. Ice shelf collapse ... will lead to the loss of existing marine habitats and the creation of new habitats. In general, fauna ... nutrient input, there may be consequent loss of some species or communities. Colonisation of new habitats ...
Meeting Document : WG-EMM-12/34 : Author(s): P.N Trathan, S.M. Grant (United Kingdom), V. Siegel and K.-H. Kock (Germany)
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Summer distribution, abundance and structure of krill populations (Euphausia superba and Euphausia crystallorophias) sampled by plankton net in the western Ross Sea (January–February 2000)
) were analysed to obtain a general picture of the summer distribution pattern, abundance and demography ... of krill in the western Ross Sea (Antarctica). A midwater sampler-trawl (Hamburg Plankton Net) was ... used to collect zooplankton and fish larvae at 63 stations. The net was deployed normally as a standard ... double oblique tow. Mean relative biomass of Antarctic krill Euphausia superba, in the area north of ...
Meeting Document : WG-EMM-00/38 : Author(s): M. Azzali, A. Sala and G. Brancato (Italy)
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Habituation to an acoustic harassment device (AHD) by killer whales depredating demersal longlines
return of initial depredation behaviour strongly suggests that AHDs are ineffective at deterring ... fisheries that suffer significant losses caused by odontocete depredation. However, the efficacy of AHDs to ... deter odontocetes from fishing gear remains poorly investigated. To determine the effectiveness of AHDs ... distances of 29 killer whales from the vessel (n = 1,812 records) were collected during 45 phases of AHD ...
Meeting Document : WG-FSA-14/P04 : Author(s): P. Tixier, N. Gasco, G. Duhamel and C. Guinet
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ECOSYSTEM SERVICES OF THE SOUTHERN OCEAN
the concept of ecosystem services is not generally used within the Antarctic Treaty System (ATS), creating ... the ATS are in many ways pre-adapted to deliver evidence-based policy which takes the current and future ... their global importance; (ii) facilitating comparisons of individual services across the ATS; (iii ... ) facilitating consideration of the full suite of ecosystem services under the ATS; (iv) allowing comparability ...
Meeting Document : WG-EMM-11/21 : Author(s): S.M. Grant, S.L. Hill and P.N. Trathan (UK)
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Preliminary investigations of an assessment model for skates and rays in the Ross Sea
, steepness, and size and age at maturity. The applicability of a general model, such as presented here, to a ... Antarctic skates in SSRUs 88.1H, 88.1I, 88.1J, & 88.1K of the Ross Sea. The developmental model ... attempted to create a catch history of all skates and rays in the Ross Sea, and integrate these data with ... assessment model. We conclude that aspects of the catch history were very uncertain, including the species ...
Meeting Document : WG-SAM-07/4 : Author(s): A. Dunn, S.M. Hanchet, S.L. Ballara and M.P. Francis (New Zealand)