Invasive or alien species

Species whose introduction and/or spread by human action outside their natural distribution threatens biological diversity, food security, and human health and well-being. “Alien’ refers to the species’ having been introduced outside its natural distribution (“exotic’, “non-native’ and “non-indigenous’ are synonyms for “alien’). “Invasive’ means “tending to expand into and modify ecosystems to which it has been introduced’. Thus, a species may be alien without being invasive, or, in the case of a species native to a region, it may increase and become invasive, without actually being an alien species.

Related keywords
Threatened species
Biodiversity or biological diversity
Biodiversity loss

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