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    Arcalís-Planas, Anna Sveegaard, Signe Karlsson, Olle Harding, Karin C. Wåhlin, Anna Harkonen, Tero and Teilmann, Jonas 2015. Limited use of sea ice by the Ross seal (Ommatophoca rossii), in Amundsen Sea, Antarctica, using telemetry and remote sensing data. Polar Biology, Vol. 38, Issue. 4, p. 445.


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    Bengtson, John L. Laake, Jeff L. Boveng, Peter L. Cameron, Michael F. Bradley Hanson, M. and Stewart, Brent S. 2011. Distribution, density, and abundance of pack-ice seals in the Amundsen and Ross Seas, Antarctica. Deep Sea Research Part II: Topical Studies in Oceanography, Vol. 58, Issue. 9-10, p. 1261.


    Curtis, Caitlin Stewart, Brent S. and Karl, Stephen A. 2011. Genetically effective population sizes of Antarctic seals estimated from nuclear genes. Conservation Genetics, Vol. 12, Issue. 6, p. 1435.


    Gedamke, Jason and Robinson, Sarah M. 2010. Acoustic survey for marine mammal occurrence and distribution off East Antarctica (30-80°E) in January-February 2006. Deep Sea Research Part II: Topical Studies in Oceanography, Vol. 57, Issue. 9-10, p. 968.


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Estimating population status under conditions of uncertainty: the Ross seal in East Antarctica

  • Colin J. Southwell (a1), Charles G.M. Paxton (a2), David L. Borchers (a2), Peter L. Boveng (a3), Erling S. Nordøy (a4), Arnoldus Schytte Blix (a4) and William K. De La Mare (a5)
  • DOI: http://dx.doi.org/10.1017/S0954102007000879
  • Published online: 01 January 2008
Abstract
Abstract

The Ross seal (Ommatophoca rossii) is the least studied of the Antarctic ice-breeding phocids. In particular, estimating the population status of the Ross seal has proved extremely difficult. The Protocol on Environmental Protection to the Antarctic Treaty currently designates the Ross seal as a ‘Specially Protected Species’, contrasting with the IUCN's classification of ‘Least Concern’. As part of a review of the Ross seal's classification under the Protocol, a survey was undertaken in 1999/2000 to estimate the status of the Ross seal population in the pack ice off East Antarctica between 64–150°E. Shipboard and aerial sighting surveys were carried out along 9476 km of transect to estimate the density of Ross seals hauled out on the ice, and satellite dive recorders deployed on a sample of Ross seals to estimate the proportion of time spent on the ice. The survey design and analysis addressed the many sources of uncertainty in estimating the abundance of this species in an effort to provide a range of best and plausible estimates. Best estimates of abundance in the survey region ranged from 41 300–55 900 seals. Limits on plausible estimates ranged from 20 500 (lower 2.5 percentile) to 226 600 (upper 97.5 percentile).

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Corresponding author
*colin.southwell@aad.gov.au
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Antarctic Science
  • ISSN: 0954-1020
  • EISSN: 1365-2079
  • URL: /core/journals/antarctic-science
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