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Nature is an internet of relationships, one that may collapse when keystone species are misplaced. In the Pacific Northwest, the connection between salmon and orca illustrates how the lack of one species takes one other down with it. Eighty p.c of an orca’s food regimen is chinook salmon, whose inhabitants has fallen by 60% over the previous 40 years. Now, the Southern Resident Orca that stay in and round Puget Sound have seen their numbers decrease by 25.6% since 1995.
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