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Habitat preferences of Adélie and chinstrap penguins during pre-moult
Abstract: In order to understand and mitigate for the potential impacts of anthropogenic ... phase of the annual cycle. We show that Adélie penguins have an affinity to forage and moult on sea-ice ... to moult. However, habitat models aimed to predict the preferred foraging habitats of penguins during ... understand the distribution and foraging behaviour of penguins during certain stages of the life-cycle, and ...
Meeting Document : WG-EMM-18/P12 : Autor(es): V. Warwick-Evans, M. Santos and P.N. Trathan
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UPDATE ON ITEMS OF INTEREST TO WG-IMAF
mitigation trials that are underway in New Zealand. We also briefly report on the ongoing revision of the ... Economic Zone that are relevant to the work of the IMAF working group. The bycatch of seabirds by fisheries ... within New Zealand’s EEZ in recent years that either breed or forage within the CCAMLR convention area ... (Convention Area seabirds) is detailed. This paper contains description of the recent and ongoing seabird ...
Meeting Document : WG-IMAF-09/16 : Autor(es): N. Walker (New Zealand)
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Dietary composition of juvenile Dissostichus eleginoides (Pisces, Nototheniidae) around Shag Rocks and South Georgia, Antarctica.
Abstract: A diet analysis of the Patagonian toothfish Dissostichus eleginoides, trawled in the ... by the frequency of occurrence method. Cephalopods and mysids were infrequent in the stomachs, and ... South Georgia Islands area in March–April 1996, was carried out by frequency of occurrence (F%) and ... coefficient ‘‘Q’’ (%) methods. The samples consisted chiefly of immature specimens, with predominant length ...
Meeting Document : WG-FSA-05/P6 : Autor(es): Casaux, R., Barrera-Oro, E.R., Marschoff, E.R.
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IMPROVING ESTIMATES OF ADÉLIE PENGUIN BREEDING POPULATION SIZE: DEVELOPING FACTORS TO ADJUST ONE-OFF POPULATION COUNTS FOR AVAILABILITY BIAS
times within a breeding season to minimise bias in estimates of the breeding population has long been ... Abstract: It is widely recognised that the interpretation of counts of penguin populations at ... recognised, the considerable work in obtaining one-off counts for population surveys have not been matched by ... the collection of adjustment data. This was recognised at the recent Predator Survey workshop, where ...
Meeting Document : WG-EMM-09/38 : Autor(es): C. Southwell, J. McKinlay, L. Emmerson, R. Trebilco and K. Newbery (Australia)
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Comparison of age readings by two otolith preparation techniques and readers
and in interpretation of the break and burn preparation method to warrant further coordination and ... in interpretation of otolith banding patterns. Results suggest broad agreement in ages determined by ... . This experiment highlights the importance of monitoring and comparing ageing protocols within and ... between fish ageing programmes. The criteria for determining similar age interpretation used here (mean ...
Meeting Document : WG-FSA-14/53 : Autor(es): S.J. Parker (New Zealand), A.F. Petrov (Russia), C.P. Sutton (New Zealand) and E.N. Kuznetsova (Russia)
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Review of research into seabird–fishery interactions
formulated by the review editorial panel (submitted separately to WG-FSA), to assist in the development of ... research plans for managing seabird mortalities and the effect of these on seabird population viability in ... (post 1990), and in relation to direct effects of fishing through fisheries mortalities was considered ... . The research was divided into five main groupings: a) estimation of bycatch; b) population estimation ...
Meeting Document : WG-FSA-05/42 : Autor(es): R. Alderman (New Zealand)
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Effects of orientation on acoustic scattering from Antarctic krill at 120 kHz
) were made at a frequency of 120 kHz in a chilled insulated tank at the Long Marine Laboratory in Santa ... Cruz, CA. Individual animals were suspended in front of the transducers, were only loosely constrained ... of the krill based on the video images and was applied to five of them, giving their target strengths ... the need for better in situ behavioral data to properly interpret acoustic survey results. A generic E ...
Meeting Document : WG-EMM-99/42 : Autor(es): D.E. McGehee (USA), R.L. O’Driscoll (New Zealand) and L.V. Martin Traykovski (USA)
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Classification of Southern Ocean krill and icefish echoes using Random Forests
target identification, and could facilitate the inclusion of acoustic data in the assessment of mackerel ... echograms and analysis of differences in mean volume backscattering strengths (S V; dB re 1 m-1) measured at ... ), mean distance from the seabed (m) and geographic positional data were most important to the accuracy of ... icefish are currently surveyed using bottom-trawls, but the resultant estimates of abundance may be biased ...
Meeting Document : WG-EMM-16/23 : Autor(es): N. Fallon, S. Fielding and P. Fernandes
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Analysis of observer coverage for Japanese krill fishing vessels
1995 to 2008. Based on the multistage sampling theory, we derived the equation of variance in four ... coefficients of variation (CV) caused by the shifts in coverage at different sampling stages. Vessel coverage ... explore proper allocation of scientific observers on Japanese krill fishing vessels using the data from ... stage cluster sampling units (i.e., vessel, year, subarea, and haul), and examined changes in the ...
Meeting Document : WG-SAM-10/17 : Autor(es): T. Okuda, M. Kiyota and H. Okamura (Japan)
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MODELING PREDATION BY TRANSIENT LEOPARD SEALS FOR AN ECOSYSTEM-BASED MANAGEMENT OF SOUTHERN OCEAN FISHERIES
is important to integrate the predator needs as natural mortality of its prey in models to set prey ... precautionary interpretation in the context of an ecosystem-based management. Author(s): J. Forcada, D. Malone ... Abstract: Correctly quantifying the impacts of rare apex marine predators is essential to ... species and their dependent predators. This requires modelling the uncertainty in such processes as ...
Meeting Document : WG-EMM-09/P08 : Autor(es): J. Forcada, D. Malone, J.A. Royle and I.J. Staniland