Polar Biology

, Volume 35, Issue 10, pp 1555–1562 | Cite as

Aerial survey of Atlantic walruses (Odobenus rosmarus rosmarus) in the Pechora Sea, August 2011

  • Christian Lydersen
  • Vladimir I. Chernook
  • Dmitri M. Glazov
  • Irina S. Trukhanova
  • Kit M. Kovacs
Original Paper

Abstract

Basic knowledge of the population biology of Atlantic walruses throughout the eastern parts of their range, including the Pechora Sea, is scarce or nonexistent. Herein, we present the first estimate of walrus numbers from the Pechora Sea based on an aerial survey of 2,563 km of coastline, using a combination of infrared techniques and digital imagery. Hauled out walruses were found at three sites (Vaygach Island and two sites on Matveyev Island). A total of 968 animals were counted on aerial photographs; all of the animals appeared to be males. Crude measurements of dorsal curvilinear lengths of a subset of the photographed animals (N = 504) showed that many were adults, but 14.5 % belonged to younger age classes (shorter than 225 cm). Using an adjustment factor developed for male walruses in Svalbard, to account for animals at sea during the survey, the number of walruses occupying this area was estimated to be 3,943 (95 % CI, 3,605–4,325). No females with calves were seen in this survey, implying that the population that uses the Pechora Sea during summer has a distributional area that is larger than the survey area. Extensive oil exploration, development and production are currently taking place in the Pechora Sea. Risks posed to walruses and their prey by these industrial activities should be assessed immediately, and the genetic delineations of this population should be clarified.

Keywords

Arctic Data deficient Marine mammal Oil development Population size Russian Red List 

Supplementary material

300_2012_1195_MOESM1_ESM.pdf (67 kb)
Supplementary material 1 (PDF 67 kb)

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Christian Lydersen
    • 1
  • Vladimir I. Chernook
    • 2
  • Dmitri M. Glazov
    • 3
  • Irina S. Trukhanova
    • 4
  • Kit M. Kovacs
    • 1
  1. 1.Norwegian Polar Institute, Fram CentreTromsøNorway
  2. 2.Research and Design Institute for Fishing Fleet “Gyprorybflot”St PetersburgRussia
  3. 3.A. N. Severtsov Institute of Ecology and EvolutionRussian Academy of SciencesMoscowRussia
  4. 4.St Petersburg State UniversitySt PetersburgRussia

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