alien species

See invasive alien species.

A species, subspecies, or lower taxon occurring outside of its natural range (past or present) and dispersal potential (i.e. outside the range it occupies naturally or could not occupy without direct or indirect introduction or care by humans) and includes any part, gametes or propagule of such species that might survive and subsequently reproduce. Also known as non-native, non-indigenous, foreign, or exotic species.

a species whose presence in a region is attributable to human actions, intentional or unintentional, that enable them to overcome biogeographical barriers (Richardson et al., 2010; Figure 1.1). This includes species, subspecies or lower taxon, and any part (gametes, seeds, eggs, or propagules) of such species that might survive and subsequently reproduce