Salmon run helps shape ecosystems

BBC: Pacific salmon plays an important role in providing nutrients to part of the world's largest old-growth temperate rainforest, a study has shown. The annual migration sees salmon return to western Canada to spawn, but many are caught by bears and wolves, which carry carcasses away from the streams. This allows nutrient-rich plants to thrive in these areas. Writing in Science, the team said a shift in salmon numbers would have "far-reaching impacts" on biodiversity. "Along the Pacific coast,......

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