Sentences with phrase «polar bear population numbers»

Not exact matches

Across all 19 polar bear populations, the researchers found that the total number of ice - covered days declined at the rate of seven to 19 days per decade between 1979 and 2014.

The earlier study also compared shark population numbers with other apex predators, such as polar bears and killer whales.

While polar bear numbers are increasing in two of these populations, two others are definitely in decline.

Tagged breakup dates, Churchill, counting polar bears, Derocher, early breakup, estimates, Ontario, polar bear, population numbers, Wapusk National Park, western hudson bay

Under the new plan, native people living in Alaska will now adjust the number of polar bears they hunt depending on the rise and fall of the animal's population.

The recent listing of polar bears as «endangered» was based on junk science and GIGO computer models that claim manmade global warming will send the bears» record population numbers into oblivion.

Overall, and based on actual population studies, there is good evidence that polar bear numbers have increased, as Lawson said.

If you google «Populations and sources of recruitment in polar bears» you will find the original AP article at a number of news outlets.

«Of the 13 populations of polar bears in Canada, 11 are stable or increasing in number.

Polar bears are one of the most sensitive Arctic marine mammals to climate warming because they spend most of their lives on sea ice.35 Declining sea ice in northern Alaska is associated with smaller bears, probably because of less successful hunting of seals, which are themselves ice - dependent and so are projected to decline with diminishing ice and snow cover.36, 37,38,39 Although bears can give birth to cubs on sea ice, increasing numbers of female bears now come ashore in Alaska in the summer and fall40 and den on land.41 In Hudson Bay, Canada, the most studied population in the Arctic, sea ice is now absent for three weeks longer than just a few decades ago, resulting in less body fat, reduced survival of both the youngest and oldest bears, 42 and a population now estimated to be in decline43 and projected to be in jeopardy.44 Similar polar bear population declines are projected for the Beaufort Sea region.45

Scientists fear melting sea ice could one day make killer whales the Hudson Bay's top predator, a startling ecosystem shift and a blow for Inuit populations already reeling from dwindling polar bear numbers.

Tagged Amstrup, Derocher, estimates, global warming, polar bear, population decline, population numbers, predictions

That paper, which was not peer - reviewed, argued that because polar bear numbers have remained relatively stable despite faster - than - expected sea ice loss over the past decade, scientists» predictions of future population declines are flawed.

Wilder presents these numbers as a basis for saying how concerned he is that a longer open - water season in the Arctic could increase the number of attacks by polar bears — and he's right, that's a valid concern now that the global population of bears is so high.