Possible Effects of Climate Warming on Selected Populations of Polar Bears ( Ursus maritimus ) in the Canadian Arctic

@article{Stirling2009PossibleEO,
  title={Possible Effects of Climate Warming on Selected Populations of Polar Bears ( Ursus maritimus ) in the Canadian Arctic},
  author={Ian Stirling and Claire L. Parkinson},
  journal={Arctic},
  year={2009},
  volume={59},
  pages={261-275}
}
Polar bears depend on sea ice for survival. Climate warming in the Arctic has caused significant declines in total cover and thickness of sea ice in the polar basin and progressively earlier breakup in some areas. Inuit hunters in the areas of four polar bear populations in the eastern Canadian Arctic (including Western Hudson Bay) have reported seeing more bears near settlements during the open-water period in recent years. In a fifth ecologically similar population, no changes have yet been… 

Tables from this paper

Polar bears and sea ice habitat change

The polar bear (Ursus maritimus) is an obligate apex predator of Arctic sea ice and as such can be affected by climate warming-induced changes in the extent and composition of pack ice and its

Shifts in female polar bear (Ursus maritimus) habitat use in East Greenland

Results indicate that multi-decadal loss of sea ice has resulted in shifts in polar bear habitat use in EG, and there was a statistically significant and stronger winter preference in the 2000s for adult females to select for higher sea ice concentrations.

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

The NB polar bear population appears to have been stable or possibly increasing slightly during the period of this study, which 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.

Polar Bear Distribution and Habitat Association Reflect Long-term Changes in Fall Sea Ice Conditions in the Alaskan Beaufort Sea

The polar bear ( Ursus maritimus ) is considered an indicator species of ecosystem health because of its longevity, life-history requirements, reliance on sea ice (i.e., sea ice obligate), and

Variation in the response of an Arctic top predator experiencing habitat loss: feeding and reproductive ecology of two polar bear populations

Higher biological productivity and prey availability in the CS relative to the SB, and a shorter recent history of reduced sea ice habitat, may explain the maintenance of condition and recruitment of CS bears.

Variation in habitat use of Beaufort Sea polar bears

Analysis of habitat selection patterns of subadult male and female and adult female polar bears in the Southern Beaufort Sea population from 2007 to 2011 found that polar bears displayed broad similarities in seasonal habitat selection by using nearshore areas in winter/spring and ranging farther offshore into the multiyear ice in summer/autumn.

Changes in winter and spring resource selection by polar bears Ursus maritimus in Baffin Bay over two decades of sea-ice loss

It is indicated that significant changes in available sea-ice habitat and habitat use in Baffin Bay have occurred since the mid-1990s and this subpopulation will likely experience negative population-level impacts related to a changing climate in the coming decades.

Inuit Perspectives on Polar Bears (Ursus maritimus) and Climate Change in Baffin Bay, Nunavut, Canada

Abstract Scientific research has demonstrated negative effects caused by climate change on three of 19 polar bear populations’ worldwide (Stirling et al. 1999; Aars et al. 2006). As a result the

Polar Bear Ecology and Management in Hudson Bay in the Face of Climate Change

Hudson Bay, Canada has been a region of intensive research on polar bear population ecology dating back to the late 1960s. Although the impacts of climate change on sea ice habitat throughout the

Home range distribution of polar bears in western Hudson Bay

Home range size was predicted by season, ice break-up date, and individual in a multiple regression, though R2 was low, and solitary females had smaller home ranges and were closer to land compared to females with offspring.
...

References

SHOWING 1-10 OF 115 REFERENCES

Polar Bears in a Warming Climate1

It is unlikely that polar bears will survive as a species if the sea ice disappears completely as has been predicted by some, but the effects of climate change are likely to show large geographic, temporal and even individual differences and be highly variable, making it difficult to develop adequate monitoring and research programs.

Population ecology studies of the polar bear in northern Labrador

Résumé During spring 1976-79 we marked and recaptured polar bears in northern Labrador. Thirty-seven polar bears were captured and individually tagged. Most were found along the interface between the

Long-term Trends in the Population Ecology of Polar Bears in Western Hudson Bay in Relation to Climatic Change

From 1981 through 1998, the condition of adult male and female polar bears has declined significantly in western Hudson Bay, as have natality and the proportion of yearling cubs caught during the

Polar Bears and Seals in the Eastern Beaufort Sea and Amundsen Gulf: A Synthesis of Population Trends and Ecological Relationships over Three Decades

In the eastern Beaufort Sea and Amundsen Gulf, research on polar bear populations and their ecological interrelationships with seals and sea ice conditions began in the fall of 1970. Analysis of

Polar Bear Distribution and Abundance on the Southwestern Hudson Bay Coast During Open Water Season, in Relation to Population Trends and Annual Ice Patterns

In Hudson Bay, all the ice melts in summer, and the last areas to be ice-free (around mid-to-late July) are usually off the coasts of Manitoba and Ontario. Thus, all polar bears are forced ashore to

CLIMATE CHANGE AND RINGED SEAL (PHOCA HISPIDA) RECRUITMENT IN WESTERN HUDSON BAY

Climate warming is predicted to reduce the extent of ice cover in the Arctic and, within the Hudson Bay region, the annual ice may be significantly decreased or entirely lost in the foreseeable

Declining Extent of Open-water Refugia for Top Predators in Baffin Bay and Adjacent Waters

Localized trends in the available fraction of open-water were examined in March during 1979–2001, derived from approximate sea ice concentrations from satellite-based microwave telemetry.

Polar bear predation of ringed and bearded seals in the land-fast sea ice habitat

Predation of seals by the polar bear, Ursus maritimus, was not significant in the Western Arctic. In the High Central and Eastern Arctic, and along southeastern Baffin Island, bear predation of the

Climate change and ice breeding pinnipeds

Pinniped diversity is greatest in seasonally ice-covered seas where the risk of predation is minimised. In recent decades, the thickness and extent of seasonal ice cover has decreased in the Arctic,

The Population Dynamics of Polar Bears in Western Hudson Bay

The changes in reproduction, weight, and cub mortality are consistent with the predictions of a densitydependent response to increasing population size.
...