Sentences with phrase «many polar bear populations»

A new University of Washington study, with funding and satellite data from NASA and other agencies, finds a trend toward earlier sea ice melt in the spring and later ice growth in the fall across all 19 polar bear populations, which can negatively impact the feeding and breeding capabilities of the bears.

Nineteen separate polar bear populations live throughout the Arctic, spending their winters and springs roaming on sea ice and hunting.

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.

«It is possible that Svalbard may have provided one such important refuge during warming periods, in which small polar bear populations survived and from which founder populations expanded during cooler periods,» argues biologist Charlotte Lundqvist of the University at Buffalo, The State University of New York, who is a co-author of the new study.

«When we look forward several decades, climate models predict such profound loss of Arctic sea ice that there's little doubt this will negatively affect polar bears throughout much of their range, because of their critical dependence on sea ice,» said Kristin Laidre, a researcher at the University of Washington's Polar Science Center in Seattle and co-author of a study on projections of the global polar bear population.

Killing it would just help the polar bear population drop quicker pushing them even closer to extinction.

The team then plugged their sea ice figures into a model of polar bear populations.

Some changes are well - known, such as declines in polar bear populations and stresses to walruses being forced out of their shallow feeding grounds as ice retreats into deeper waters.

The team hopes future research will clarify the impacts of grizzly bear aggression on the polar bear population.

Logically, the polar bear population should have crashed...

As sea ice disappears, polar bear populations will crash harder than the seabirds.

«It is extremely intriguing how the habit of bird egg eating is developing within the polar bear population,» says Prop.

Yet recently there have been claims that polar bear populations are increasing.

Simulations of how the DNA changed over time suggest that polar bear populations rose and fell with the temperature.

Thousands of drowning polar bears??? Crichton will point out the fact that polar bear populations have increased dramatically during the current warming period.

This is a hands - on investigative STEM focusing on issues of climate change and how it affects the polar caps, and subsequently the polar bear population.

For the real story on polar bear populations, see Federal studies show polar bear, walrus populations in trouble.

The likelihood of serious sea level rise under «business as usual», and impacts on water resources may not have the acute drama associated with polar bear population decline or the possibility of massive methane clathrate releases, but they are much more likely to figure on policy makers agendas — just as other long term chronic issues (such as pensions) do.

Unless he is of the opinion that greenhouse gas emissions directly effects the polar bear population.

Linda Gormezano, a biologist at the American Museum of Natural History, has been studying the polar bear population along the western shore of Hudson Bay.

So how to explain the increase in the polar bear population from 5,000 in 1950 to 25,000 today, as documented by the U.S. Fish & Wildlife Service?

This is a policy perspective paper and what is clearly lacking is policy and plans about what will happen when we see a sudden change in a polar bear population.

And suggestions that polar bear populations worldwide have grown are of uncertain sources and poorly documented.

Steven C. Amstrup, the federal biologist who led an analysis last year concluding that the world's polar bear population could shrink two thirds by 2050 under moderate projections for retreating summer sea ice, is once again in the field along Alaska's Arctic coast, studying this year's brood of cubs, yearlings and mothers.

The surge of hunting that depleted many polar bear populations in the 20th century is largely under control.

Also, international cooperation on management of polar bear populations is on the rise, and reflected in the 2011 polar bear treaty involving native groups and governments in Russia and the United States.

I do not want to draw any conclusions as to the threat to the polar bear populations posed by the ongoing environmental changes / future warming of the Arctic.

RE - Sanjong Thanpa: «So how to explain the increase in the polar bear population from 5,000 in 1950 to 25,000 today, as documented by the U.S. Fish & Wildlife Service?»

Recent estimates suggest a 60 % reduction of the polar bear population by the year 2050.

6) The polar bear population is increasing.

He was a recent speaker (from 37.20) at the 2011 Heartland Institute conference, and can be counted on to produce a contrarian take on any particular issue that anyone might care about — ranging from climate, to mercury in fish and polar bear population dynamics.

how to explain the increase in the polar bear population from 5,000 in 1950 to 25,000 today, as documented by the U.S. Fish & Wildlife Service?

The Arctic Refuge's coastal plain provides the most important land denning habitat for the Beaufort Sea polar bear population.

* Monitor polar bear populations and trends * Study polar bear feeding ecology * Work cooperatively with the Alaska Nanuuq Commission and the North Slope Borough for co-management of polar bears in Alaska * Provide technical assistance to the participants of the 1988 North Slope Borough Inuvialuit (In new vee al u it) Game Council Agreement for the conservation of polar bears in the southern Beaufort Sea region and monitor the effects of oil and gas operations in the Beaufort Sea region.

[Soon] was a recent speaker (from 37.20) at the 2011 Heartland Institute conference, and can be counted on to produce a contrarian take on any particular issue that anyone might care about — ranging from climate, to mercury in fish and polar bear population dynamics.

On a related front, a new paper in the journal Nature Communications (available in full online) projects deep reductions in litter size in the polar bear population along the western shores of Hudson Bay, should the open - water season continue to lengthen as foreseen under the warming influence of accumulating greenhouse gases.

«The evidence of the impact on polar bear populations is already in.

The polar bear population has increased 27 % since 2005.

Models created by experts said such a dramatic loss of sea ice would cause a sharp drop in the polar bear population and threaten their very survival.

A bit more good news about polar bear populations, this time from an abundance study in the Southern Beaufort Sea.

«Variation in the response of an Arctic top predator experiencing habitat loss: feeding and reproductive ecology of two polar bear populations.»

Retreating sea ice is associated with polar bear populations, which makes it another symbol for climate change.

Is there a mutiny in the works between the IUCN Red List and the IUCN Polar Bear Specialist Group (PBSG) over polar bear population estimates or has there simply been a breach of ethics?

The rebounding of polar bear populations over the past several decades has been a huge success story.

Since the available hard data showed that polar bear populations have been soaring, not dropping, and since the hard data also show there has been no measurable global warming for at least 18 years, the PBSG had to come up with a scenario that would contradict this rosy trend.

This is true of the polar bear populations in Alaska,

Have a look at the details below and see if you come to the same decision I have: that it's not possible to compare WHB «core» area polar bear population estimates over time.

After the November 1973 agreement to regulate hunting and outlaw hunting from aircraft and icebreakers, the polar bear population rebounded.

The New York Times has come up with a new defense against so - called climate denialists who happen to point out that most polar bear populations are steady or increasing amidst climate change: The ice hasn't disappeared as fast as we said it would.

The overall polar bear population appears stable, but disappearing sea ice in the Arctic is widely believed to pose a long - term threat to the species.