Search results

1. Dynamics of Antarctic penguin populations in relation to inter-annual variability in sea-ice distribution

   Abstract:  To investigate the role of sea ice cover on penguin populations we used principal ... component analysis to compare population variables of Adélie (Pygoscelis adeliae) and chinstrap (Pygoscelis ... population size remained stable, whereas that of chinstrap penguins decreased slightly. For neither species ... apparent inverse density-dependent relationship between the number of Adélie breeding pairs and the number ...

   Meeting Document : WG-EMM-96/10 : Author(s): Murphy, E.J., Croxall, J.P., Trathan, P.N.

2. Orientation of Antarctic krill in an aquarium

   slightly less than that when animals were hovering, 49.7° (SD=7.5°, N=50). Such an acute angle of elevation ... . Although mature females with marked swelling of the cephalothorax were not included in the experiment, the ... center of mass was found to be situated more to the anterior than in males and immature females. The ... hovering orientation, which is close to average body orientation, of mature males and mature females was ...

   Meeting Document : WG-KRILL-93/24 : Author(s): Y. Endo (Japan)

3. Semi-empirical acoustic estimates of krill biomass derived from simulated commercial fishery data based on single-frequency acoustics

   fishing seasons. From these data we develop semi-empirical indices of acoustic biomass in a Generalized ... Linear Modeling framework. We correlate these estimates of biomass with acoustic estimates derived from ... Elephant Island and West Shelf Areas of the US AMLR survey grid. Cross-validation of acoustic estimates ... frequency of animals is skewed towards larger animals. We show that it is possible to develop semi-empirical ...

   Meeting Document : SG-ASAM-12/04 : Author(s): A.M. Cossio, G.W. Watters, C.S. Reiss, J. Hinke and D. Kinzey (USA)

4. Winter and summer foraging location of Adélie penguins from Mawson, Davis and Casey

   with a diet which is largely comprised of the fishery target species Antarctic krill (Euphausia superba ... physiological, environmental and time constraints imposed upon them. Knowledge of their summer and winter ... foraging locations is relevant to WG-EMM in terms of understanding the spatial and temporal scales of ... influence on CEMP parameters as well as the management of the Southern Ocean marine living resources in ...

   Meeting Document : WG-EMM-13/08 : Author(s): L. Emmerson, N. Kokubun and C. Southwell (Australia)

5. Deployment and recovery of an archival tag on an Antarctic toothfish in the Ross Sea

   migration patterns in fishes. Understanding these movement patterns is one of the key information needs for ... the assessment and management of Antarctic toothfish. We deployed 4 pop-off satellite archival tags on ... large toothfish on the Ross Sea slope in January 2013 and report on the first recovery of an Antarctic ... 24, 2013), providing 335 days of data archived at 10 min intervals. Summaries of raw data show strong ...

   Meeting Document : WG-FSA-14/64 : Author(s): S.J. Parker, D.N. Webber and R. Arnold (New Zealand)

6. Semi-empirical acoustic estimates of krill biomass derived from simulated commercial fishery data based on single-frequency acoustics

   fishing seasons. From these data we develop semi-empirical indices of acoustic biomass in a Generalized ... Linear Modeling framework. We correlate these estimates of biomass with acoustic estimates derived from ... Elephant Island and West Shelf Areas of the US AMLR survey grid. Cross-validation of acoustic estimates ... frequency of animals is skewed towards larger animals. We show that it is possible to develop semi-empirical ...

   Meeting Document : SG-ASAM-15/03 : Author(s): A.M. Cossio, G.W. Watters, C.S. Reiss, J. Hinke and D. Kinzey (USA)

7. Diet of grey-headed albatrosses at the Diego Ramírez Islands, Chile: ecological implications

   Abstract:  The diet of grey-headed albatrosses at Diego Ramírez, Chile, was analyzed and compared ... to that of the sympatric black-browed albatross. Diet composition was inferred from an analysis of ... . The squid Martialia hyadesi predominated in the diet samples in 2001 and 2002 (89% and 81% of ... suggests that M. hyadesi plays an important role in the breeding performance of grey-headed albatrosses at ...

   Meeting Document : WG-FSA-04/12 : Author(s): J. Arata (Chile), G. Robertson (Australia), J. Valencia (Chile), J.C. Xavier (UK) and C.A. Moreno (Chile)

8. Interannual variability of krill, salp and other zooplankton populations in the South Shetland Island area during Austral summer 1993–1998

   during the 1993 "salp year". The magnitude of this salp bloom may have resulted from a large ... overwintering "seed" population developed the preceding autumn. Presence of large numbers of another ... . Comparisons of January and February 1998 survey data with data from previous AMLR field seasons showed ... recurring patterns of species abundance relationships that allowed definition of different ecological ...

   Meeting Document : WG-EMM-98/50 : Author(s): V. Loeb, W. Armstrong, R. Hewitt (USA) and V. Siegel (Germany)

9. PREDICTING THE VULNERABILITY OF BENTHIC, HABITAT-FORMING ORGANISMS TO DISTURBANCE USING LIFE-HISTORY CHARACTERISTICS

   Abstract:  Assessing the impacts of fishing on Vulnerable Marine Ecosystems (VMEs) in the Southern ... Ocean is hampered by the paucity of information on the resistance and resilience of these ecosystems to ... disturbance. Both resistance and resilience of individual VME-forming taxa are related to their life-history ... characteristics. A global database of life-history characteristics, including growth rate, age, maximum size and ...

   Meeting Document : WG-EMM-09/35 : Author(s): K. Martin-Smith (Australia)

10. Stock structure of Antarctic toothfish in Statistical Area 88 and implications for assessment and management

    Abstract:  We review the stock structure of Antarctic toothfish in Statistical Area 88 with the ... aim of characterising the likely stock boundaries relative to stock assessments. We include ... complex of SSRU 88.2H. Key information needs to further understand stock structure include characterising ... the movement patterns and linkages of Antarctic toothfish in the 80–120 cm size range, throughout the ...

    Meeting Document : WG-SAM-14/26 : Author(s): S.J. Parker, S.M. Hanchet and P.L. Horn (New Zealand)

Pages