Non-Indigenous Species (NIS)
Non-Indigenous Species (NIS) : Nonnative plant, animal, or microbe species introduced into a region that then overwhelms, crowds out, or disrupts relationships among native species, degrades habitats, and contaminates the gene pools of indigenous species. Examples include the wooly adelgid (an insect damaging hemlock trees in the Smoky Mountains), kudzu, and fire ants in southern U.S., and more than 160 known aquatic species in the Great Lakes
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