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Polar bear population status in the northern Beaufort Sea, Canada, 1971–2006

Overview of attention for article published in Ecological Applications, April 2011
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About this Attention Score

  • In the top 25% of all research outputs scored by Altmetric
  • High Attention Score compared to outputs of the same age (94th percentile)
  • High Attention Score compared to outputs of the same age and source (97th percentile)

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3 blogs
3 tweeters


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188 Mendeley
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Polar bear population status in the northern Beaufort Sea, Canada, 1971–2006
Published in
Ecological Applications, April 2011
DOI 10.1890/10-0849.1
Pubmed ID

Ian Stirling, Trent L. McDonald, E. S. Richardson, Eric V. Regehr, Steven C. Amstrup


Polar bears (Ursus maritimus) of the northern Beaufort Sea (NB) population occur on the perimeter of the polar basin adjacent to the northwestern islands of the Canadian Arctic Archipelago. Sea ice converges on the islands through most of the year. We used open-population capture-recapture models to estimate population size and vital rates of polar bears between 1971 and 2006 to: (1) assess relationships between survival, sex and age, and time period; (2) evaluate the long-term importance of sea ice quality and availability in relation to climate warming; and (3) note future management and conservation concerns. The highest-ranking models suggested that survival of polar bears varied by age class and with changes in the sea ice habitat. Model-averaged estimates of survival (which include harvest mortality) for senescent adults ranged from 0.37 to 0.62, from 0.22 to 0.68 for cubs of the year (COY) and yearlings, and from 0.77 to 0.92 for 2-4 year-olds and adults. Horvtiz-Thompson (HT) estimates of population size were not significantly different among the decades of our study. The population size estimated for the 2000s was 980 +/- 155 (mean and 95% CI). These estimates apply primarily to that segment of the NB population residing west and south of Banks Island. The NB polar bear population appears to have been stable or possibly increasing slightly during the period of our study. This suggests that ice conditions have remained suitable and similar for feeding in summer and fall during most years and that the traditional and legal Inuvialuit harvest has not exceeded sustainable levels. However, the amount of ice remaining in the study area at the end of summer, and the proportion that continues to lie over the biologically productive continental shelf (< 300 m water depth) has declined over the 35-year period of this study. If the climate continues to warm as predicted, we predict that the polar bear population in the northern Beaufort Sea will eventually decline. Management and conservation practices for polar bears in relation to both aboriginal harvesting and offshore industrial activity will need to adapt.

Twitter Demographics

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Mendeley readers

The data shown below were compiled from readership statistics for 188 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Canada 3 2%
Brazil 2 1%
United Kingdom 2 1%
United Arab Emirates 1 <1%
Turkey 1 <1%
Portugal 1 <1%
India 1 <1%
Colombia 1 <1%
Australia 1 <1%
Other 4 2%
Unknown 171 91%

Demographic breakdown

Readers by professional status Count As %
Researcher 42 22%
Student > Master 36 19%
Student > Bachelor 24 13%
Student > Ph. D. Student 23 12%
Other 17 9%
Other 22 12%
Unknown 24 13%
Readers by discipline Count As %
Agricultural and Biological Sciences 99 53%
Environmental Science 35 19%
Social Sciences 7 4%
Earth and Planetary Sciences 6 3%
Medicine and Dentistry 4 2%
Other 11 6%
Unknown 26 14%

Attention Score in Context

This research output has an Altmetric Attention Score of 20. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 08 October 2020.
All research outputs
of 19,040,944 outputs
Outputs from Ecological Applications
of 2,921 outputs
Outputs of similar age
of 164,183 outputs
Outputs of similar age from Ecological Applications
of 35 outputs
Altmetric has tracked 19,040,944 research outputs across all sources so far. Compared to these this one has done particularly well and is in the 93rd percentile: it's in the top 10% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 2,921 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 13.0. This one has done well, scoring higher than 87% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 164,183 tracked outputs that were published within six weeks on either side of this one in any source. This one has done particularly well, scoring higher than 94% of its contemporaries.
We're also able to compare this research output to 35 others from the same source and published within six weeks on either side of this one. This one has done particularly well, scoring higher than 97% of its contemporaries.