", "Ecological risk assessment of persistent organic pollutants in the arctic", "Chlorinated hydrocarbon contaminants and metabolites in polar bears (, "Rebuttal of "Polar Bear Population Forecasts: A Public-Policy Forecasting Audit, "The Energetic Value of Land-Based Foods in Western Hudson Bay and Their Potential to Alleviate Energy Deficits of Starving Adult Male Polar Bears", "Can polar bears use terrestrial foods to offset lost ice-based hunting opportunities? Os derramamentos de petróleo tamén afectan os osos polares. Polar bears are able to produce water through the metabolism of fats found in seal blubber,[50] and are therefore found primarily along the perimeter of the polar ice pack, rather than in the Polar Basin close to the North Pole where the density of seals is low.[51]. 475–485 in Wild furbearer management and conservation in North America (M. Novak, J. [99][104] The dump in Churchill, Manitoba was closed in 2006 to protect bears, and waste is now recycled or transported to Thompson, Manitoba. If the seal does not notice, the bear creeps to within 9 to 12 m (30 to 40 ft) of the seal and then suddenly rushes forth to attack. [203], Debate over the listing of the polar bear under endangered species legislation has put conservation groups and Canada's Inuit at opposing positions;[43] the Nunavut government and many northern residents have condemned the U.S. initiative to list the polar bear under the Endangered Species Act. Todo o seu corpo está adaptado para o mellor desenvolvemento na auga e para o frío. [210] Only once the spirit was appeased was the skull be separated from the skin, taken beyond the bounds of the homestead, and placed in the ground, facing north. [116] In most subpopulations, maternity dens are situated on land a few kilometres from the coast, and the individuals in a subpopulation tend to reuse the same denning areas each year. Ursus ungavensis [2], According to the World Wildlife Fund, the polar bear is important as an indicator of Arctic ecosystem health. Polar bears sometimes have problems with various skin diseases that may be caused by mites or other parasites. 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Ao contrario da crenza, nunca foi observado que o oso polar, en busca da camuflaxe perfecta, esconda o fociño cando está cazando. Biologist Ian Stirling commented, "For many years, the conservation of polar bears was the only subject in the entire Arctic that nations from both sides of the Iron Curtain could agree upon sufficiently to sign an agreement. Nacen cegas e pesando moi pouco en relación ao peso adulto, sendo unha das crías menos desenvolvidas dos mamíferos euterios. In some areas, the polar bear's diet is supplemented by walrus calves and by the carcasses of dead adult walruses or whales, whose blubber is readily devoured even when rotten. Polar bear. [193], Many chemicals, such as PCBs and DDT, have been internationally banned due to the recognition of their harm on the environment. [154] The treaty allows hunting "by local people using traditional methods". The only other bear similar in size to the polar bear is the Kodiak bear, which is a subspecies of brown bear. As femias deféndeas mesmo fronte a un macho que mida o duplo do seu tamaño. Malia que é unha especie irmá do oso pardo,[5] evolucionou para ocupar un estreito nicho ecolóxico, e moitas das súas características corporais foron adaptacións ás baixas temperaturas, a desprazarse pola neve e o xeo, a nadar en mar aberto e a cazar focas, que son a principal fonte da súa dieta. Appenzeller, T. and Dimick, D. R. (2004) "The Heat is On,", International Agreement on the Conservation of Polar Bears, Ministry of Natural Resources and Environment, International Union for Conservation of Nature, 2019 mass invasion of Russian polar bears, "Late Pleistocene fossil find in Svalbard: the oldest remains of a polar bear (, 10.2305/IUCN.UK.2015-4.RLTS.T22823A14871490.en, "Alaska, Chukotka sign agreement to manage polar bears", "Education: Marine Mammal Information: Polar Bears", "Unequal Rates of Y Chromosome Gene Divergence during Speciation of the Family Ursidae", "Molecular distance and divergence time in carnivores and primates", "Complete mitochondrial genome of a Pleistocene jawbone unveils the origin of polar bear", "Ancient Hybridization and an Irish Origin for the Modern Polar Bear Matriline", "Nuclear Genomic Sequences Reveal that Polar Bears Are an Old and Distinct Bear Lineage", "Population Genomics Reveal Recent Speciation and Rapid Evolutionary Adaptation in Polar Bears", "Brown bears and polar bears split up, but continued coupling", "List of Marine Mammal Species & Subspecies", "Genetic structure of the world's polar bear populations", Supplementary material for Ursus maritimus Red List assessment, "Killing polar bears in Iceland "only logical thing to do, "The war over the polar bear: Who's telling the truth about the fate of a Canadian icon?