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. ā€œAlienā€™ refers to the speciesā€™ having been introduced outside its natural distribution (ā€œexoticā€™, ā€œnon-nativeā€™ and ā€œnon-indigenousā€™ are synonyms for ā€œalienā€™). ā€œInvasiveā€™ means ā€œtending to expand into and modify ecosystems to which it has been introducedā€™. 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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