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Doklady Earth Sciences

, Volume 458, Issue 2, pp 1312–1316 | Cite as

Assessment of the amount of polar bears (Ursus maritimus) on the basis of perennial vessel counts

  • G. G. Matishov
  • N. G. Chelintsev
  • Yu. I. Goryaev
  • P. R. Makarevich
  • D. G. Ishkulov
Geography

Abstract

This article presents a method of assessment of the amount of polar bears on the basis of data on vessel counts. The results of 32 vessel transect counts in the southern part of the Kara Sea are used as the primary data. They are processed in an original program using separate extrapolation by sectors and summarizing of data of several different counts. In recent years, the calculated amount of bears in the studied region has varied from 3300 to 3100 individuals (3200, on average). The relative statistical error of estimations smoothly decreases from 8 to 7%. The confidence interval of the estimation at statistical error of 7% and probability level of 95% is 2700–3500 individuals.

Keywords

DOKLADY Earth Science Polar Bear Vessel Count Kola Scientific Murmansk Marine Biological Institute 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Pleiades Publishing, Ltd. 2014

Authors and Affiliations

  • G. G. Matishov
    • 1
  • N. G. Chelintsev
    • 1
  • Yu. I. Goryaev
    • 1
  • P. R. Makarevich
    • 1
  • D. G. Ishkulov
    • 1
  1. 1.Murmansk Marine Biological Institute, Kola Scientific CenterRussian Academy of SciencesMurmanskRussia

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