Posted: 06 Apr 2012 05:28 AM PDT
Regions of the earth where water is frozen for at least a month each year are shrinking as a result of global warming. Some of the effects on ecosystems are now being revealed through research conducted at affected sites over decades. They include dislocations of the relationships between predators and their prey, as well as changes in the movement through ecosystems of carbon and nutrients. The changes interact in complex ways that are not currently well understood, but effects on human populations are becoming apparent.
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