Revisiting Western Hudson Bay: Using aerial surveys to update polar bear abundance in a sentinel population

Revisiting Western Hudson Bay: Using aerial surveys to update polar bear abundance in a sentinel... 1 Introduction</h5> Polar bears ( Ursus maritimus ) span the circumpolar Arctic, with an estimated 20,000–25,000 bears inhabiting 19 populations across 5 range states ( Obbard et al., 2010 ). Although there are significant gaps in basic demographic information from portions of their range ( Obbard et al., 2010 ), the Western Hudson Bay population (WH) in Canada ranks as one of the most intensively studied large mammal populations worldwide, with a research program dating back more than 4 decades ( Jonkel et al., 1972; Stirling et al., 1977; Derocher and Stirling, 1995a; Regehr et al., 2007 ).</P>Scientific evidence from the long-term capture and tagging program in WH suggests that the abundance of polar bears increased during the 1970s, remained stable for a period in the 1980s, and decreased by about 22% between 1984 and 2004 ( Derocher and Stirling, 1995a; Lunn et al., 1997; Regehr et al., 2007 ). The recent decline in abundance has been attributed to earlier sea ice breakup in Hudson Bay ( Regehr et al., 2007 ). This trend in sea ice breakup and the resultant extension of the ice-free season have forced bears to spend longer periods on land without access to http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Biological Conservation elsevier

Revisiting Western Hudson Bay: Using aerial surveys to update polar bear abundance in a sentinel population

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Publisher
Elsevier
Copyright
Copyright © 2014 Elsevier Ltd
ISSN
0006-3207
D.O.I.
10.1016/j.biocon.2013.12.040
Publisher site
See Article on Publisher Site

Abstract

1 Introduction</h5> Polar bears ( Ursus maritimus ) span the circumpolar Arctic, with an estimated 20,000–25,000 bears inhabiting 19 populations across 5 range states ( Obbard et al., 2010 ). Although there are significant gaps in basic demographic information from portions of their range ( Obbard et al., 2010 ), the Western Hudson Bay population (WH) in Canada ranks as one of the most intensively studied large mammal populations worldwide, with a research program dating back more than 4 decades ( Jonkel et al., 1972; Stirling et al., 1977; Derocher and Stirling, 1995a; Regehr et al., 2007 ).</P>Scientific evidence from the long-term capture and tagging program in WH suggests that the abundance of polar bears increased during the 1970s, remained stable for a period in the 1980s, and decreased by about 22% between 1984 and 2004 ( Derocher and Stirling, 1995a; Lunn et al., 1997; Regehr et al., 2007 ). The recent decline in abundance has been attributed to earlier sea ice breakup in Hudson Bay ( Regehr et al., 2007 ). This trend in sea ice breakup and the resultant extension of the ice-free season have forced bears to spend longer periods on land without access to

Journal

Biological Conservationelsevier

Published: Feb 1, 2014

References

  • Accommodating unmodeled heterogeneity in double-observer distance sampling surveys
    Borchers, D.L.; Laake, J.L.; Southwell, C.; Paxton, C.G.M.
  • Incorporating covariates into standard line transect analyses
    Marques, F.F.C.; Buckland, S.
  • Microsatellite analysis of population structure in Canadian polar bears
    Paetkau, D.; Calvert, W.; Stirling, I.; Strobeck, C.
  • Distance software: design and analysis of distance sampling surveys for estimating population size
    Thomas, L.; Buckland, S.T.; Rexstad, E.A.; Laake, J.L.; Strindberg, S.; Hedley, S.L.; Bishop, J.R.B.; Marques, T.A.; Burnham, K.P.

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