"Naturalized" usually refers to species that have adapted to a region over a long period of time, while "invasive" refers to particularly destructive or aggressive species.
「naturalized（帰化）」とは長い期間にわたって地域に適応した種を表すのが通常であり、"invasive"「侵略種」とは特に他の種に影響し攻撃的な種を言うことが多い。