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Zoology and wildlife conservation

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Male-biased harvesting of polar bears in western Hudson Bay

Article Abstract:

Polar bear populations suffer from a low rate of increase and are easily harmed by harvesting. Few studies have examined the effect of harvesting on polar bears because of lack of data as to the size of their populations. The exception is the polar bear population in Western Hudson Bay where the population size remained unchanged between 1978 and 1992. A study of the composition of the polar bear harvest shows a bias towards male and young bears. The harvest is probably sustainable because it protects the female bear population.

Author: Derocher, Andrew E., Stirling, Ian, Calvert, Wendy
Publisher: Wildlife Society
Publication Name: The Journal of Wildlife Management
Subject: Zoology and wildlife conservation
ISSN: 0022-541X
Year: 1997
Demographic aspects, Wildlife management

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Estimation of polar bear population size and survival in Western Hudson Bay

Article Abstract:

Data on the age and reproductive status of polar bears were fitted to Jolly-Seber mark-recapture models to determine their population size and survival rates. The 1977-1992 study, which looked at bears in western Hudson Bay near Manitoba, Canada, revealed that the mean age of both sexes rose during the course of the research due to the enforcement of harvest quotas in the 1960s. Generally, it showed that sustainable harvest management remains feasible for both consumptive and nonconsumptive purposes.

Author: Derocher, Andrew E., Stirling, Ian
Publisher: Wildlife Society
Publication Name: The Journal of Wildlife Management
Subject: Zoology and wildlife conservation
ISSN: 0022-541X
Year: 1995
Measurement

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Effects of earlier sea ice breakup on survival and population size of polar bears in western Hudson Bay

Article Abstract:

A study is conducted to estimate population size and survival for polar bears, one of the most ice-dependent of the Arctic marine mammals, in western Hudson Bay, Canada. Results provide evidence for a casual association between sea ice breakups due to climatic warming and decreased polar bear survival.

Author: Regehr, Eric V., Lunn, Nicholas J., Armstrup, Steven C., Stirling, Ian
Publisher: Wildlife Society
Publication Name: The Journal of Wildlife Management
Subject: Zoology and wildlife conservation
ISSN: 0022-541X
Year: 2007
Canada, Environmental aspects, Climatic changes, Climate change, Sea ice

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Subjects list: Research, Natural history, Hudson Bay, Polar bear, Animal populations
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