Feb 23,2007 00:00
Biologist Steven Amstrup discusses global warming, polar bears in
Scientists agree: If greenhouse-gas emissions remain uncurbed, the consequences to the planet will be devastating. Wildlife biologist Steven Amstrup discusses the effects of global warming on polar bears as part of the Wildlife Conservation Lecture Series on Tuesday, Feb. 27, at the Oregon Zoo.
Amstrup, a research wildlife biologist with the
Over the past 25 years, the summer sea-ice melt period has lengthened, and the summer sea-ice cover has declined by more than a half million square miles. "Longer ice-free seasons have resulted in reduced survival of young and old polar bears and a chronic population decline over the past 20 years," says Amstrup.
"Recent observations of nutritionally driven cannibalism and unexpected mortalities of prime age polar bears in