Tuesday, February 12, 2019

Polar bears area unit classified as marine mammals because of the very fact that they pay a lot of their lives on Arctic ocean ice and a substantial quantity of your time swimming. Polar bears have evolved to be unambiguously fitted to life within the Arctic. Their impermeable coat is thicker than the other species, with fur covering even their feet for heat and traction on ice. A thick layer of blubber provides extra insulation moreover as buoyancy within the water. With large, flat, oar-like feet, polar bears area unit glorious swimmers. though they need to be noticed swimming in open Arctic waters as way as two hundred miles from land, swimming long distances isn't most well-liked, because it needs an incredible quantity of energy for adults and may be fatal to young bears.

In the biologically wealthy Arctic, polar bears sit at the highest of the organic phenomenon. Polar bears feed nearly solely on the fat of ice-dependent seals. as a result of polar bears cannot outswim seal, they hunt their take advantage of land. the foremost vital habitats for polar bears area unit the perimeters of ice wherever ice is regularly melting and refreezing. This method creates open areas within the ocean (between ocean and ice) wherever polar bears will hunt seal that returns up for air.

Polar bears area unit solely found within the Arctic. There area unit nineteen completely different subpopulations, scattered across the northern fringe of the U.S., Canada, Greenland, Norway, and Russia, four of that area unit in decline. The Beaufort Sea region is arguably the foremost studied and polar bears during this region have fallen forty % within the last 10 years.
                   

What area unit the first causes of ice bear decline?


Put simply, Arctic ice is melting and this is often creating searching progressively troublesome for polar bears. consistent with National Geographic, “Even these days, within the middle of the bitterly cold Arctic winter, satellites show there's concerning 770,000 sq. miles less ocean ice than the 1981 to 2010 median", a vicinity larger than American state and CA combined. As a result of world temperature change, ice is melting sooner within the spring and forming later within the fall, forcing bears to travel nice distances to search out an object to hunt. Polar bears aren’t engineered for walking long distances. they will thin terribly quickly however conjointly gain it back even as quick if they will catch enough food. though capable of swimming long distances, polar bears burn way more energy swimming than walking. The larger of the gap the bears ought to travel reach the ice to hunt, a lot of weight they lose, eventually losing muscle, more decreasing their possibilities of searching success, resulting in a downward spiral.

The survival and protection of polar bears and their surrounding area unit imperative problems. “Their dependence on ocean ice implies that climate warming poses the one most significant threat to [polar bears'] persistence,” a team of researchers according to within the Cryosphere, a journal of the ECU Geosciences Union.
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