Estimating the Barents Sea polar bear subpopulation size

J Aars, Tiago A. Marques, M Andersen, S Belikov, A Boltunov, Stephen Terrence Buckland, O Wiig

Research output: Contribution to journalArticlepeer-review

64 Citations (Scopus)

Abstract

A large scale survey was conducted in August 2004 to estimate the size of the Barents Sea polar bear subpopulation. We combined helicopter line transect distance sampling surveys in most of the survey area with total counts in small areas not suitable for distance sampling. Due to weather constraints we failed to survey some of the areas originally planned to be covered by distance sampling. For those, abundance was estimated using a ratio estimator, in which the auxiliary variable was the number of satellite telemetry fixes (in previous years). We estimated that the Barents Sea subpopulation had approximately 2650 (95% CI approx 1900 to 3600) bears. Given current intense interest in polar bear management due to the potentially disastrous effects of climate change, it is surprising that many subpopulation sizes are still unknown. We show here that line transect sampling is a promising method for addressing the need for abundance estimates.
Original languageEnglish
Pages (from-to)35-52
Number of pages18
JournalMarine Mammal Science
Volume25
Issue number1
Early online date31 Jul 2008
DOIs
Publication statusPublished - Jan 2009

Keywords

  • Helicopter surveys
  • Distance sampling
  • Line transects
  • Polar bears
  • Barents Sea
  • Subpopulation size

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