Résultats de la recherche

1. KRILLBASE: a circumpolar database of Antarctic krill and salp numerical densities, 1926–2016

   on the abundance of both taxa have been obtained from net sampling surveys since 1926, but much of ... the potential uses of this database. With increasing numbers of requests for these data we here ... 56 seasons in two epochs (1926–1939 and 1976–2016). Here, we illustrate the seasonal, inter-annual ... KRILLBASE to reduce artefacts in interpretation, with contact points for the main data providers. Author(s ...

   Meeting Document : WG-EMM-17/P03 : Auteur(s): A. Atkinson, S.L. Hill, E.A. Pakhomov, V. Siegel, R. Anadon, S. Chiba, K.L. Daly, R. Downie, S. Fielding, P. Fretwell, L. Gerrish, G.W. Hosie, M.J. Jessopp, S. Kawaguchi, B.A. Krafft, V. Loeb, J. Nishikawa, H.J. Peat, C.S. Reiss, R.M. Ross, L.B. Quetin, K. Schmidt, D.K. Steinberg, R.C. Subramaniam, G.A. Tarling and P. Ward

2. Estimating nest-level phenology and reproductive success of colonial seabirds using time-lapse cameras

   corroborated general understanding of latitudinal trends and species-level plasticity in phenology. 4. The ... camera network in the Antarctic Peninsula region to demonstrate its utility. 3. Mean egg lay and ... Abstract:  We wish to draw the attention of Members to an online application of the R code ... published in the attached paper. The web-based app ‘photoR’ (https://jefferson.shinyapps.io/photor2 ...

   Meeting Document : WG-EMM-18/P01 : Auteur(s): J.T. Hinke, A. Barbosa, L.M. Emmerson, T. Hart, M.A Juáres, M. Korczak-Abshire, G. Milinevsky, M. Santos, P.N. Trathan, G.M. Watters and C. Southwell

3. INVESTIGATING LENGTH AT MATURITY OF ANTARCTIC TOOTHFISH (DISSOSTICHUS MAWSONI) BASED ON SCIENTIFIC OBSERVERS’ DATA

   Abstract:  Through generalised linear models, the gonadosomatic index of Antarctic toothfish in ... difference in the GSI values of fish at different maturity stages. However these studies were carried out on ... 137cm. The equivalent GSI at 50% maturity was in the range of 1.1 to 1.4%. These results were used to ... histology and GSI data, most fish found in the northern areas, about a third of those found in the slope ...

   Meeting Document : WG-FSA-08/48 : Auteur(s): S. Mormede, S. Parker and P. Grimes (New Zealand)

4. Multiple acoustic estimates of krill density at South Georgia during 2000/2001 reveal significant intra-annual and spatial variability

   was less than that in the eastern box (80.4 g m-2). Analysis of mid-season western survey box transect ... was intermediate between the eastern and western areas. The size structure of the krill in the central ... density to the south-west of South Georgia was 32.1 g m-2 mid-season. By March, krill density in the ... single “snap-shot” acoustic survey data. This is a crucial step in the elucidation of response functions ...

   Meeting Document : WG-EMM-01/15 : Auteur(s): A.S. Brierley, C. Goss, S.A. Grant, J.L. Watkins, K. Reid, M. Belchier, I. Everson, M.J. Jessop, V. Afanasyev and J. Robst (United Kingdom)

5. IMPACTS OF CLIMATE CHANGE ON ANTARCTIC MARINE ECOSYSTEMS: A CALL FOR ACTION

   decade, but little in the way of policy or operational change has resulted at CCAMLR. Over the past 50 ... ice. "The uncertainty in climate predictions leads to uncertainty in projections of impacts, but ... Committee needs to increase its work on climate change impacts in order to consider the consequences of a ... approach to management in the context of the unknowns of climate change, and to include in this approach ...

   Meeting Document : CCAMLR-XXVII/BG/27 : Auteur(s): Submitted by ASOC

6. An index of per capita recruitment

   )eM where R1 is the proportion of age-1 animals sampled in year y and M is the post-recruit mortality ... the population is available; and 4) the proportion of age-1 animals in the sample can be determined ... assumed in order to investigate the resulting distributions of PCR. Distributions of PCR are skewed toward ... conclusions are insensitive to changes in the shape of the functional relationship between spawners and ...

   Meeting Document : WG-EMM-99/50 : Auteur(s): R. Hewitt (USA)

7. NET-BASED VERIFICATION OF ACOUSTIC TECHNIQUES USED TO IDENTIFY ANTARCTIC KRILL

   model derived target id window only identified krill in 6 of the 16 nets correctly. The ‘2 freq 2-16 ... ’ algorithm attributed more than 90 % of the total backscatter to krill in all but 1 aggregation with the ‘2 ... krill in 12 out of the 16 nets. The ‘2 freq 2 – 12’ window only attributed more than 90 % of the total ... backscatter to krill in 6 nets while the ‘3 freq model’ attributed only just greater than 50 % of the ...

   Meeting Document : WG-EMM-08/54 : Auteur(s): J. Watkins and S. Fielding (United Kingdom)

8. Detailed distribution of krill fishing around South Georgia

   only been available to the scientific community in the form of sub-area or fine-scale(0.5 ° latitude by ... has operated they do not reveal the localised nature of the fishing operation. In particular they give ... available from August but the fishery was restricted in that period to an area on the western edge of the ... Abstract:  The distribution of kri!! harvesting effort and associated catch rates has previously ...

   Meeting Document : WG-EMM-96/64 : Auteur(s): Parkes, G., Everson, I., Trathan, P.N., Murphy, E.J.

9. Influence of krill availability on humpback whale breeding success

   Abstract:  The abundance of the Antarctic krill (Euphausia superba) has been declining in the ... survival) of the krill consumers may be compromised. In the present study, we investigated the reproductive ... frequency of extreme El Niño events may compromise humpback whale’s rate of recovery in the Southern ... western Antarctic Peninsula (WAP), probably as a consequence of the effects of the considerable increase ...

   Meeting Document : WG-EMM-18/P15 : Auteur(s): E. Seyboth, F. Félix, M.-A. Lea, L. Dalla Rosa, G. Watters, K. Reid and E. Secchi

10. Target strengths of krill at 136 and 20 kHz

    lengths in the range (45,50) mm the mean single-krill target strengths are in the range (-68,-69) dB at ... 136 kHz. For aggregations with mean lengths in the range (43,47)mm the mean single-krill target ... strengths are in the range (-71,-77) dB at 20 kHz. Trawling-acoustic method. For aggregations with mean ... lengths in the range (47,50) mm the mean target strengths in the range (-71,-75) dB at 20 kHz were ...

    Meeting Document : WG-KRILL-91/29 : Auteur(s): S.M. Kasatkina (USSR)

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