Sentences with phrase «polar bear populations»

Figure 2: Global polar bear population status assessment even better than this.

Nearly all said that global warming threatens polar bear populations.

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

The researchers also examined 92 recent scientific papers that addressed the evidence for sea ice loss and its impact on future polar bear populations.

And yellow shows regions whose polar bear population numbers have been guessed.

The same is true of polar bear populations as it is of sea ice extent and air, sea and surface temperature.

Soon and his colleagues said the report's authors used flawed methods to project future polar bear populations.

Large margins of error in polar bear population estimates means the conservation status threshold of a 30 % decline (real or predicted) used by the US Endangered Species Act and the IUCN Red List is probably not valid for this species.

Projections in 2007 indicated that by the middle of the century loss of Arctic ice will have reduced the 22,000 polar bear population by two - thirds.

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?

«Not the end of the story» While the administration declined to use the fast - track authority to overturn the ESA rule, Salazar and other Interior officials said they might pursue changing the rule through the regulatory process if polar bear populations decline.

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

For example, levels of PCB's and other industrial chemicals appear to be declining in studied polar bear populations, as in this new paper.

As late April is the peak of this critical spring feeding period for most polar bear populations, this is when sea ice conditions are also critical.

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.

If you need a primer on how anthropogenic climate change affects polar bear populations, then read:

These estimates suggest a very recent and rapid expansion of modern polar bear populations throughout the Arctic since the Late Pleistocene, perhaps following a climate - related population bottleneck, although data from more modern and Holocene polar bear specimens will be required to establish this.

If you prefer to go with reality, here's the good news from Susan Crockford, who puts the global polar bear population at a very healthy 26,000.

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

«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.

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

«Consequently, over those decades, the entire polar bear population of Western Hudson Bay has been forced to come ashore progressively earlier to begin fast - ing and also to fast for a longer period...» «Figure 3 shows the decline in mean estimated mass of lone (and thus possibly pregnant) adult female polar bears in Western Hudson Bay from 1980 through 2004.

We are seeing the effects in the southern polar bear populations very clearly now and our analyses suggest that we'll see the western Hudson Bay bears extirpated in 2 - 3 decades or less.

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

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.

Willie Soon's paper, which appears in the journal Ecological Complexity, questions «whether polar bear populations really are declining and if sea ice, on which the animals hunt, will actually disappear as quickly as climate models predict.»

Tagged Barber and Iacozza, bearded seal, beluga whales, Gulf of Boothia, local Inuit knowledge, M'Clintock Channel, multiyear ice, narwhal, polar bear population density, ringed seal, sea ice habitat, Thiemann

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.

Despite Center for Biological Diversity assertions that «Arctic sea ice melt is a disaster for the polar bears», research shows polar bear populations have continued to thrive and increase.

The only ones they provide are month - end averages (e.g. Feb / 1979), so I've provided an end - Feb and end - March for a few years (I threw in the map for Feb. 2007, the last year of the latest polar bear population survey in Davis Strait, at the very end):

There was Willie Soon who was 3rd author on a paper criticizing studies forecasting polar bear populations.

He also claimed that «Overall the total polar bear population has been holding steady or slightly increasing.»

Watch the global warming issue zooming by in a superficial manner and all the horrific claims — increasingly extreme weather events, imperiled polar bear populations, skeptics who are paid to lie about the truth of all of this — sound like they are true.

The presence of this warm water in the North Atlantic helps explain why Scotland has a relatively mild climate when compared to places at similar latitudes in North America such as Churchill, Manitoba — a Canadian town famous for its seasonal polar bear population.