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vented forests from fully changing to ponds and wetlands-pre venting dramatic environmental change. Tom Gable,a biologist at the Voyageurs Wolf Project, notes wolf impacts add up with time.Over 10 years,he esti mates,Voyageurs's wolf packs may affect one pond for every 2.1 square kilometers of land.And the phenomenon may not be u- nique to northern Minnesota."Given the fact that wolves and beavers co-occur across a substantial portion of the Northern Hemisphere,Gable says,"this mechanism is likely occurring everywhere wolves are preying on beavers.