Observations of mortality associated with extended open-water swimming by polar bears in the Alaskan Beaufort Sea

@article{Monnett2005ObservationsOM,
  title={Observations of mortality associated with extended open-water swimming by polar bears in the Alaskan Beaufort Sea},
  author={Charles Monnett and Jeffrey S. Gleason},
  journal={Polar Biology},
  year={2005},
  volume={29},
  pages={681-687}
}
During aerial surveys in September 1987–2003, a total of 315 live polar bears were observed with 12 (3.8%) animals in open water, defined for purposes of this analysis as marine waters >2 km north of the Alaska Beaufort Sea coastline or associated barrier islands. No polar bear carcasses were observed. During aerial surveys in early September, 2004, 55 polar bears (Ursus maritimus) were seen, 51 were alive and of those 10 (19.9%) were in open water. In addition, four polar bear carcasses were… Expand

Figures and Tables from this paper

Long-distance swimming by polar bears (Ursus maritimus) of the southern Beaufort Sea during years of extensive open water
TLDR
It is shown that adult female polar bears and their cubs are capable of swimming long distances during periods when extensive areas of open water are present, however, long-distance swimming appears to have higher energetic demands than moving over sea ice. Expand
Aquatic behaviour of polar bears (Ursus maritimus) in an increasingly ice-free Arctic
TLDR
The considerable swimming and diving capacities of polar bears might provide them with tools to exploit aquatic environments previously not utilized, likely to be increasingly important to the species’ survival in an Arctic with little or no persistent sea ice. Expand
Survival and breeding of polar bears in the southern Beaufort Sea in relation to sea ice.
TLDR
The effects of sea ice loss on polar bears in the southern Beaufort Sea may apply to polar bear populations in other portions of the polar basin that have similar sea ice dynamics and have experienced similar, or more severe, sea ice declines. Expand
Summer refugia of polar bears (Ursus maritimus) in the southern Beaufort Sea
TLDR
Overall, bears made high use of ice over shallow waters, and bears that remained near terrestrial areas used sea ice (presumably to hunt from) when it was available, and Energetic expenditure is anticipated to increase as bears are required to travel further on a seasonal basis. Expand
Unusual predation attempts of polar bears on ringed seals in the southern beaufort sea: Possible significance of changing spring ice conditions
In April and May 2003 through 2006, unusually rough and rafted sea ice extended for several tens of kilometres offshore in the southeastern Beaufort Sea from about Atkinson Point to the AlaskaExpand
Consequences of long-distance swimming and travel over deep-water pack ice for a female polar bear during a year of extreme sea ice retreat
TLDR
The observation indicates that long distance swimming in Arctic waters, and travel over deep water pack ice, may result in high energetic costs and compromise reproductive fitness. Expand
Traditional Knowledge about Polar Bears ( Ursus maritimus ) in Northwestern Alaska
Polar bears ( Ursus maritimus ) are an iconic Arctic species, but residents of Arctic coastal communities are among the few who have opportunities to observe their behavior for extended periods ofExpand
Polar bear population dynamics in the southern Beaufort Sea during a period of sea ice decline.
TLDR
Investigation of the population dynamics of polar bears in the southern Beaufort Sea from 2001 to 2010 suggests that factors other than sea ice can influence survival, and refined understanding of the ecological mechanisms underlying polar bear population dynamics is necessary. Expand
Effects of sea ice extent and food availability on spatial and temporal distribution of polar bears during the fall open-water period in the Southern Beaufort Sea
TLDR
The results suggest that long-term reductions in sea-ice could result in an increasing proportion of the Southern Beaufort Sea polar bear population coming on land during the fall open-water period and an increase in the amount of time individual bears spend on land. Expand
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), andExpand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 56 REFERENCES
Habitat preferences of polar bears in the western Canadian Arctic in late winter and spring
Between late March and May, from 1971 through 1979, we surveyed 74,332 km 2 of sea-ice habitatin the eastern Beaufort Sea and Amundsen Gulf in the western Canadian Arctic. We defined seven sea-iceExpand
Terrestrial Foraging by Polar Bears during the Ice-Free Period in Western Hudson Bay
TLDR
Food habits of polar bears on land during the ice-free period in western Hudson Bay were examined and the energetic importance of terrestrial foraging was not able to be determined, but the intake may reduce the rate of weight loss of bear on land, particularly in years when berries are abundant. Expand
Polar Bears in a Warming Climate1
TLDR
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. Expand
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 ofExpand
INFLUENCE OF SEA ICE DYNAMICS ON HABITAT SELECTION BY POLAR BEARS
Polar bears live in high-latitude environments characterized by cyclic variation in form and extent of sea ice. From 1991 to 1995, we used radio telemetry and monthly satellite images to compareExpand
Variability of Cetacean Distribution and Habitat Selection in the Alaskan Arctic, Autumn 1982-91
Ten years (1982-91) of autumn sighting data from aerial surveys offshore northern Alaska were analyzed to investigate variability in cetacean distribution and habitat selection. Habitat selectionExpand
CHAPTER 7 – Polar Bear
The polar bear is the largest of the extant bears. Polar bears occur in most ice-covered seas of the Northern Hemisphere, including the coastal waters of the Bering, Chukchi, and Beaufort seas. TheExpand
Movements and distribution of polar bears in the Beaufort Sea
TLDR
Net geographic movements from the beginning to the end of each month were smaller for females with cubs of the year than for solitary females, and larger in November than in April, May, or July. Expand
Polar Bear Aerial Survey in the Eastern Chukchi Sea: A Pilot Study
Alaska has two polar bear populations: the Southern Beaufort Sea population, shared with Canada, and the Chukchi/Bering Seas population, shared with Russia. Currently a reliable population estimateExpand
Possible Impacts of Climatic Warming on Polar Bears
If climatic warming occurs, the first impacts on polar bears ( Ursus maritimus ) will be felt at the southern limits of their distribution, such as in James and Hudson bays, where the wholeExpand
...
1
2
3
4
5
...