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Estimating the Barents Sea polar bear subpopulation size

Research output: Contribution to journalArticle

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Estimating the Barents Sea polar bear subpopulation size. / Aars, J; Marques, Tiago A.; Andersen, M; Belikov, S; Boltunov, A; Buckland, Stephen Terrence; Wiig, O.

In: Marine Mammal Science, Vol. 25, No. 1, 01.2009, p. 35-52.

Research output: Contribution to journalArticle

Harvard

Aars, J, Marques, TA, Andersen, M, Belikov, S, Boltunov, A, Buckland, ST & Wiig, O 2009, 'Estimating the Barents Sea polar bear subpopulation size', Marine Mammal Science, vol. 25, no. 1, pp. 35-52. https://doi.org/10.1111/j.1748-7692.2008.00228.x

APA

Aars, J., Marques, T. A., Andersen, M., Belikov, S., Boltunov, A., Buckland, S. T., & Wiig, O. (2009). Estimating the Barents Sea polar bear subpopulation size. Marine Mammal Science, 25(1), 35-52. https://doi.org/10.1111/j.1748-7692.2008.00228.x

Vancouver

Aars J, Marques TA, Andersen M, Belikov S, Boltunov A, Buckland ST et al. Estimating the Barents Sea polar bear subpopulation size. Marine Mammal Science. 2009 Jan;25(1):35-52. https://doi.org/10.1111/j.1748-7692.2008.00228.x

Author

Aars, J ; Marques, Tiago A. ; Andersen, M ; Belikov, S ; Boltunov, A ; Buckland, Stephen Terrence ; Wiig, O. / Estimating the Barents Sea polar bear subpopulation size. In: Marine Mammal Science. 2009 ; Vol. 25, No. 1. pp. 35-52.

Bibtex - Download

@article{5a1e27402dda495f86cd22465c1b01f3,
title = "Estimating the Barents Sea polar bear subpopulation size",
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.",
keywords = "Helicopter surveys, Distance sampling, Line transects, Polar bears, Barents Sea, Subpopulation size",
author = "J Aars and Marques, {Tiago A.} and M Andersen and S Belikov and A Boltunov and Buckland, {Stephen Terrence} and O Wiig",
year = "2009",
month = "1",
doi = "10.1111/j.1748-7692.2008.00228.x",
language = "English",
volume = "25",
pages = "35--52",
journal = "Marine Mammal Science",
issn = "0824-0469",
publisher = "John Wiley & Sons, Ltd (10.1111)",
number = "1",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Estimating the Barents Sea polar bear subpopulation size

AU - Aars, J

AU - Marques, Tiago A.

AU - Andersen, M

AU - Belikov, S

AU - Boltunov, A

AU - Buckland, Stephen Terrence

AU - Wiig, O

PY - 2009/1

Y1 - 2009/1

N2 - 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.

AB - 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.

KW - Helicopter surveys

KW - Distance sampling

KW - Line transects

KW - Polar bears

KW - Barents Sea

KW - Subpopulation size

UR - http://www.scopus.com/inward/record.url?scp=58349121746&partnerID=8YFLogxK

U2 - 10.1111/j.1748-7692.2008.00228.x

DO - 10.1111/j.1748-7692.2008.00228.x

M3 - Article

VL - 25

SP - 35

EP - 52

JO - Marine Mammal Science

JF - Marine Mammal Science

SN - 0824-0469

IS - 1

ER -

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ID: 402002

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