norse polar bear
, Steven Amstrup and other U.S. Geological Survey scientists have predicted two-thirds of the world's polar bears may disappear by 2050, based on moderate projections for the shrinking of summer sea ice caused by climate change, though the validity of this study has been debated. Polar bears mate in April or May.  The Arctic is home to millions of seals, which become prey when they surface in holes in the ice in order to breathe, or when they haul out on the ice to rest.  Insufficient nourishment leads to lower reproductive rates in adult females and lower survival rates in cubs and juvenile bears, in addition to poorer body condition in bears of all ages. Whether the Norse domesticated other wild … Polar bears are popular in fiction, particularly in books for children or teenagers. Polar bears are typically off-white in colour, but vary from grey, through shades of white to yellow. For the We Bare Bears character, see, Species of bear native largely to the Arctic Circle, Coat of arms of the Greenlandic Self-Rule government (, Conservation status, threats, and controversies. Norway passed a series of increasingly strict regulations from 1965 to 1973, and has completely banned hunting since then. – National Geographic Blog", "PBSG statement on proposed transfer of polar bear to CITES Appendix I", "Nunavut hunters can kill more polar bears this year", "Rethink polar bear hunt quotas, scientists tell Nunavut hunters", "Melting Under Pressure: The Real Scoop on Climate Warming and Polar Bears", "Nunavut hunters still enraged over bear quotas", National Polar Bear Conservation Strategy for Canada, "Russia tries to save polar bears with legal hunt", "Red Data Book of Russia: Marine Mammals: Carnivores", "Strategy for Polar Bear Conservation in the Russian Federation", "Environmental Conservation Online System", http://www.fws.gov/alaska/PDFs/PBRT%20Recovery%20Plan%20Book.pdf, "Possible effects of climate warming on selected populations of polar bears (, "Polar bear distribution and abundance on the Southwestern Hudson Bay coast during open water season, in relation to population trends and annual ice patterns", "Observations of mortality associated with extended open-water swimming by polar bears in the Alaskan Beaufort Sea", "Next up from climate change: More polar bears on land, potentially running into humans", "As Sea Ice Shrinks, Can Polar Bears Survive on Land? The Greenlandic vocabulary word for a polar bear is also used as a … For only $5 per month you can become a member and support our mission to engage people with cultural heritage and to improve history education worldwide. ", "Determinants of Home Range Size for Polar Bears (, "Polar Bear Ursus maritimus – APPEARANCE/ MORPHOLOGY: TAIL", "Fractures of the radius and ulna secondary to possible vitamin 'D' deficiency in captive polar bears (, "Population genomics reveal recent speciation and rapid evolutionary adaptation in polar bears", 10.1644/1545-1542(2005)86[895:SDOPB]2.0.CO;2. Polar bears can swim 10 km/h (6 mph). Males usually reach sexual maturity at six years; however, as competition for females is fierce, many do not breed until the age of eight or ten.  However, most polar bear biologists think that polar bears will be unable to completely offset the loss of calorie-rich seal blubber with terrestrial foods, and that they will be outcompeted by brown bears in this terrestrial niche, ultimately leading to a population decline. Mellom 50 og 100 isbjørn merkes eller gjenfanges hvert år. U.m. Polar bears are stealth hunters, and the victim is often unaware of the bear's presence until the attack is underway. Ellis Davidson notes: Dog skeletons, sometimes several at a time, are found along with those of horses and cattle in the great Scandinavian ship-burials of the Viking Age, and both large hunting dogs and smaller breeds in individual graves…In Scandinavian myth and legend the dog is the guardian of the underworld and one reason for putting a dog into a grave might be to provide a guide for the dead. On 15 May 2008, the United States Department of the Interior listed the polar bear as a threatened species under the Endangered Species Act, citing the melting of Arctic sea ice as the primary threat to the polar bear. I mildere år fødes færre unger i disse områdene enn i kaldere år, og vi vet at mange år med lite havis kan føre til lav overlevelse, særlig blant unge dyr. This status was re-evaluated and confirmed in April 1999, November 2002, and April 2008. , Mature bears tend to eat only the calorie-rich skin and blubber of the seal, which are highly digestible, whereas younger bears consume the protein-rich red meat. The polar bear also hunts by stalking seals resting on the ice: upon spotting a seal, it walks to within 90 m (100 yd), and then crouches. There is archaeological and genetic evidence of Vikings carrying cats to Greenland, and it is possible, though not proven, that cats – as well as dogs - were also aboard the Viking ships of Leif Erikson when he landed at Vinland (Newfoundland, Canada) in the New World. These features have been selected for in polar bears as a consequence of their almost purely carnivorous way of life. Mark, Joshua J. She then travelled another 1,800 km (1,100 mi). License.  Many Inuit believe the polar bear population is increasing, and restrictions on commercial sport-hunting are likely to lead to a loss of income to their communities. Sea ice habitat has decreased in periods of the year from 1978 to recent, and in particular, this has affected the number of pregnant females that have been able to reach Hopen and Kongsøya in autumn. They still manage to consume some seals, but they are food-deprived in summer as only marine mammal carcasses are an important alternative without sea ice, especially carcasses of the beluga whale. The United States began regulating hunting in 1971 and adopted the Marine Mammal Protection Act in 1972. Økning i skipstrafikk og petroleumsvirksomhet betyr økt miljørisiko i området, og risikoen for akutte oljesøl øker tilsvarende. In 1973, the International Agreement on the Conservation of Polar Bears was signed by all five nations whose territory is inhabited by polar bears: Canada, Denmark, Norway, the Soviet Union, and the United States. Ancient History Encyclopedia. Polar bears appear to be less affected by infectious diseases and parasites than most terrestrial mammals. It is difficult to estimate a global population of polar bears as much of the range has been poorly studied; however, biologists use a working estimate of about 20–25,000 or 22–31,000 polar bears worldwide. This kind of social interaction is uncommon; it is far more typical for polar bears to behave aggressively towards dogs. Thor fails at all three tasks but is later told by the giant that magic had transformed everything and none of the challenges had actually been what they seemed. , In 1992, a photographer near Churchill took a now widely circulated set of photographs of a polar bear playing with a Canadian Eskimo Dog (Canis lupus familiaris) a tenth of its size.
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