As defined by the IUCN, an invasive alien species is "an alien species that is set in an ecosystem or natural or semi-natural habitat, is an agent of change and threatens biodiversity native. " As defined in the CBD, an invasive alien species is "an alien species whose introduction and / or spread threaten biological diversity" and cause serious damage to the economy and health. The term refers only to those species whose introduction (Whether voluntary or accidental) is always mediated by human action and under no circumstances referred to biological invasions that occur naturally (self-expansion of a species).
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