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www.reference.com/pets-animals/polar-bear-s-ecological-niche-d243664be7b03356

The polar bear's ecological niche is that of a specialized predator of seals. Polar bears are the most carnivorous (meat eaters) of all the bear species, and their diet mainly consists of ringed seals and larger bearded seals.

www.livescience.com/27436-polar-bear-facts.html

Polar bears are the largest bear speices and supremely adapted to their Arctic habitat, with thick fur and lots of fat to keep them warm.

coolpolarbearfacts.weebly.com/habitat-and-niche.html

Habitat- Polar bears inhabit the ice floes surrounding the North Pole.They can be found in Canada, Alaska and even the southern shores of Greenland and Iceland. Niche -Polar bears are carnivorous, preying mostly on seals.They often lay in wait for their prey, staking out a seal’s breathing hole in the ice and attacking when the marine mammals resurface.

en.wikipedia.org/wiki/Polar_bear_habitat

The polar bear is found in the Arctic Circle and adjacent land masses as far south as Newfoundland.Due to the absence of human development in its remote habitat, it retains more of its original range than any other extant carnivore. While they are rare north of 88°, there is evidence that they range all the way across the Arctic, and as far south as James Bay in Canada.

www.answers.com/Q/What_are_the_habitat_and_the_niche_of_the_polar_bear

Habitat Though they are excellent swimmers, polar bears spend most of their time atop Arctic sea ice. Sea ice is an ecosystem in itself, supported at its base by plankton and algae at the bottom ...

protectpolarbears.wordpress.com/ecological-niche

The polar bear has adapted to live in the harsh tundra biome. The polar bear is a heterotroph meaning that it cannot synthesize its own food and eats other organisms. Polar bears are endothermic signifying that they are warm blooded and do not need heat from the sun to live. The polar bear is a tertiary consumer…

kidsanimalsfacts.com/polar-bear-facts-for-kids

Polar bear facts for kids is a collection of some of the most amazing and interesting facts about polar bears. The polar bear (Ursus maritimus) is the largest terrestrial carnivore in the world. It is the most carnivorous species of all bears. Polar bear is also called arctic bear or white bear. The bear spends more than half of its life in ...

animalia.bio/polar-bear

The ICUN lists the Polar bear as a "Vulnerable". Ecological niche. Polar bears are a top Arctic carnivore. The remains of seals left by polar bears are likely to be an important food source for younger, less experienced bears and Arctic foxes.

www.actionbioscience.org/environment/derocher.html

Unlike other species, polar bears are unlikely to do well shifting their range further north because the polar basin is deep, cold, and unproductive. Losing the productive coastal habitats would be a serious loss, but the sea ice is more than just a platform, it is the habitat of polar bears and many of the species they rely upon.

defendersblog.org/2015/02/whats-niche

Well-adapted species could be more vulnerable to the impacts of climate change. Have you ever wondered why some species, like deer and rats and gray squirrels, seem to thrive everywhere, and others, like the polar bear, seem to need a very specific type of habitat?It has to do with a concept that ecologists call the “niche” (rhymes with “ditch”), a word that summarizes how a given ...