Sentences with phrase «for polar bear survival»

Is there a similar disconnect between predictions and observations for 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.

Not exact matches

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

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.

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.»

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

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.»

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).

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.

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

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.

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.

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.