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originally posted by: luthier
a reply to: UKTruth
Why should we care if animals go extinct? Hmm.
Your right when habitats collapse a lot of species go extinct...it's a Web and all.
Polar bears are tied to the sea ice for nearly all of their life cycle functions. Most important of these is foraging, or access to food. Polar bears almost exclusively eat seals, and they are equally as dependent upon the sea for their nutrition as are seals, whales, and other aquatic mammals. Polar bears are not aquatic, however, and their only access to the seals is from the surface of the sea ice. Over the past 25 years, the summer sea ice melt period has lengthened, and summer sea ice cover has declined by over half a million square miles. In winter, although sea ice extent has not changed as greatly, there have been dramatic reductions in the amount of old ice, predominantly in the western Arctic. This loss of stable old ice has set up additional losses of sea ice cover each summer because the thinner younger ice is more easily melted during the recent warmer summers.
Because of their dependence upon the sea ice for food, these changes can directly affect the carrying capacity of the Arctic for polar bears. Our studies are documenting numerical responses to these changes in sea ice. In Western Hudson Bay near the southern extent of the range of polar bears, the Canadian Wildlife Service has long term data on population characteristics and changes in sea ice. Our analysis of those data has shown that longer ice-free seasons have resulted in reduced survival of young and old polar bears and a population decline over the past 20 years. Recent observations of cannibalism and unexpected mortalities of prime age polar bears in Alaska are consistent with a population undergoing change. Ongoing studies are designed to gain an understanding of movement patterns of polar bears in response to changing ice conditions and of associated population responses. If we know how polar bears respond, functionally and numerically, to ice quantity and quality, we will be able to predict how forecasted changes in the ice may affect future polar bear populations. This will give managers the best chance of adapting strategies to assure long term polar bear survival in a changing ice environment. alaska.usgs.gov...
originally posted by: luthier
a reply to: UKTruth
Or humans.
Have you read about what is going on with the collapse of large predators? No?
originally posted by: xuenchen
But a real scientist says polar bear populations are increasing !!
originally posted by: namelesss
originally posted by: xuenchen
But a real scientist says polar bear populations are increasing !!
No one with an IQ actually thinks that global warming is a hoax!
Today
Today, polar bears are among the few large carnivores that are still found in roughly their original habitat and range--and in some places, in roughly their natural numbers.
Although most of the world's 19 populations have returned to healthy numbers, there are differences between them. Some are stable, some seem to be increasing, and some are decreasing due to various pressures.
But the most important point is that whatever happened in the past is really irrelevant. Polar bear habitat is disappearing due to global warming. Even the most careful on-the-ground management doesn't matter if polar bears don't have the required habitat.