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

Colin J. Southwell, Charles G. M. Paxton, David L. Borchers, Peter L. Boveng, Erling S. Nordy, Arnoldus Schytte Blix, William K. de la Mare

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


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 degrees 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).

Original languageEnglish
Pages (from-to)123-133
Number of pages11
JournalAntarctic Science
Publication statusPublished - Apr 2008


  • abundance
  • model-based inference
  • population status


Dive into the research topics of 'Estimating population status under conditions of uncertainty: the Ross seal in East Antarctica'. Together they form a unique fingerprint.

Cite this