Sentences with phrase «usgs polar bear survival»

The decision was based on evidence that sea ice is vital for polar bear survival, that this sea ice habitat has been reduced, and that this process is likely to continue; if something is not done to change this situation, the polar bear will be extinct within 45 years, Kempthorne said.

Also, I'm not sure I see strong support for this concluding sentence: «Although polar bears have persisted through previous warm phases, multiple human - mediated stressors (e.g., habitat conversion, persecution, and accumulation of toxic substances in the food chain) could magnify the impact of current climate change, posing a novel and likely profound threat to polar bear survival.»

@ Duncan — I trust DoI biologists way more than you with respect to whether global warming's threat to polar bear survival is «ridiculous» or not.

Is there a similar disconnect between predictions and observations for polar bear survival?

The result is a wildly ineffective rebuttal of my scientific conclusion that Amstrup's 2007 polar bear survival model has failed miserably.

Comments Off on Amstrup & colleages can't refute my critique of their 2007 polar bear survival model, Part 2

Fortunately, a new study by David Legates, director of the University of Delaware's Center for Climatic Research, throws cold water on the claim global warming threatens polar bears survival.

Not exact matches

On Thursday, Ruch's watchdog group plans to file a complaint with the agency on Monnett's behalf, asserting that Obama administration officials have «actively persecuted» him in violation of policy intended to protect scientists from political interference... In May 2008, the U.S. classified the polar bear as a threatened species, the first with its survival at risk due to global warming.

The polar bear is a semi-aquatic marine mammal that depends mainly upon the pack ice and the marine food web for survival.

In May 2008, the Bush Administration, after multiple lawsuits, put the polar bear on the endangered species list and acknowledged that the survival of the species is jeopardized by climate change.

If adaptation for survival in the Arctic environment has led to a less versatile immune system, then Arctic species such as the polar bear may be at risk from an influx of pathogens as global temperatures rise, the researchers warn.

By shedding light on potential mechanisms that facilitated that bear's survival during her long swim, as well as the overall metabolism and activity of bears, the current study «profoundly contributes to understanding the value of summer habitats used by polar bears in terms of their energetics,» Harlow says.

Because polar bears are entirely dependent upon the sea ice for their survival, any observed and projected reductions in preferred sea ice habitats can only result in declines.

The next step is to secure the long - term survival of the species by ensuring that the polar bear habitat in the Beaufort and Chukchi Seas is protected from the threat of oil and gas drilling.

The ACIA report described how the retreat of the sea ice has devastating consequences for polar bears, whose very survival may be at stake.

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.

The shorter change in season in the Arctic threatens the survival of polar bears, because shorter frozen seasons means shorter hunting and breeding time for polar bears.

«The PBSG is the authoritative source for information on the world's polar bears,» declares the PBSG / IUCN / Species Survival Commission website, «and one of IUCN / SSC's more than 100 specialist groups that work to produce and to compile scientific knowledge about the world's species and give independent scientific advice to decision - makers and management authorities.»

Tagged adaptation, declining sea ice, early breakup, evolution, historical sea ice record, indivdual variation, late freeze - up, natural selection, NSIDC, polar bear, resilience, sea ice minimum, sea ice variability, Stirling, Stroeve, survival, western hudson bay

Just keep reminding yourself that all the hype has very little to do with the conservation status of polar bears and virtually everything to do with the survival of the IUCN PBSG as an organization and the economic future of polar bear biologists and their ever - growing crop of students.»

In contrast, the actual science shows something quite different: though summer sea ice since 2007 has declined to levels not predicted until 2040 - 2070, there has been virtually no negative impact on polar bear health or survival, a result no one predicted back in 2005.

Survival of Barents Sea polar bears during low - ice years does not require emigration to another sea ice ecoregion or even another subpopulation area.

Both groups accept the premise that sea ice declines blamed on global warming are already a survival issue for polar bears (that will become increasingly worse in the future).

USGS polar bear biologist Karyn Rode and colleagues (press release here) have tried to frame this issue as one about future survival of polar bears in the face of declining sea ice.

Where consumption of terrestrial foods has been documented, polar bear body condition and survival rates have declined even as land use has increased.

As the struggle and the search for food continues polar bears are hanging on for survival.

Of course, Dr Monnett now says that he didn't really mean to argue anything related to global warming, and that the 25 % figure he gives for the survival rate of swimming polar bears (read the article) is just napkin math, not statistics.

Relative to recent years and potential impacts on polar bear health and survival in Canada, there is nothing alarming in the pattern or speed of sea ice breakup for 2017, either over Hudson Bay, the southern Beaufort, or the eastern high Arctic.

Tagged Arctic, climate change, global warming, health, maximum, melting, NASA, polar bear, sea ice, survival, warm, winter

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

Heavy ice conditions in the mid-1970s and mid-1980s caused significant declines in productivity of ringed seals, each of which lasted about 3 years and caused similar declines in the natality of polar bears and survival of subadults, after which reproductive success and survival of both species increased again.

Unfortunately, several bad years for ringed seal pup survival caused by shallow snow depth in spring means that in subsequent years, fewer seal pups will be produced for polar bears to eat — polar bears end up suffering after a bit of a lag.

Regehr, E. V., N. J. Lunn, S. C. Amstrup, and I. Stirling, 2007: Effects of earlier sea ice breakup on survival and population size of polar bears in western Hudson Bay.

As a result of snow depth variations, polar bear hunting success and cub survival can fluctuate rather dramatically, which in turn can cause the subpopulation size to fluctuate as well.

A new study shows that melting ice is threatening the survival of polar bears by undercutting the base of their food supply.

With virtually all CAGW projections diverging further from reality, CAGW's survival depends on propagandizing lies and half - truths: the «97 %» meme, severe weather, sea levels, global warming trends, ocean acidification, polar bear and penguin populations, polar ice caps, etc., are all supposedly worsening at «unprecedented» rates.

In conjunction with the launch of my State of the Polar Bear Report in Toronto next week, Benny Peiser (from the Global Warming Policy Foundation) and I will be participating in a coffee house discussion about polar bear conservation and survival issues on the evening of Tuesday, 27 February 2018 at 8:30Bear Report in Toronto next week, Benny Peiser (from the Global Warming Policy Foundation) and I will be participating in a coffee house discussion about polar bear conservation and survival issues on the evening of Tuesday, 27 February 2018 at 8:30bear conservation and survival issues on the evening of Tuesday, 27 February 2018 at 8:30 pm.

Tagged Amstrup, bearded seal, Beaufort, Chukchi Sea, Climate Feedback, damage control, Derocher, ESA, fact checker, failed predictions, ice - free, observations, polar bear, predictions, ringed seal, sea ice, spin, spring, Stirling, summer, survival, thick ice, threatened

As Peter Molnar, one of the paper's authors, says in an interview with the BBC, ``... as the climate warms, we may not see any substantial effect on polar bear reproduction and survival for a while, up until some threshold is passed, at which point reproduction and survival will decline dramatically and very rapidly.»

«Two findings were most critical to FWS's listing determination: (1) extensive declines in Arctic sea ice extent already have occurred and are projected to continue; and (2) the polar bear depends on sea ice for its continued survival as a species.

Research there has shown a direct link between the loss of sea ice and the health of polar bears, including a connection between an earlier spring melting of sea ice and lower survival rates for cubs.

• As far as is known, the record low extent of sea ice in March 2017 had no impact on polar bear health or survival.

Let's hope that the survival of the polar bear doesn't become another hot potato that is tossed into the long grass - after burning one - too many fingers.

There is no evidence that slightly less winter sea ice than the average since 1979 has had any negative impact on polar bear health or survival: the difference is simply not biologically meaningful...

The sea level is rising and threatening the survival of the noble polar bear.

It is also a significant place when it comes to global climate change — it is the polar regions of the planet that are experiencing the biggest rises in temperature and changes to the landscape, threatening the very survival of the polar bear.