allochthonous
definition
originating or produced in a place other than the one being considered
example
The river is inhabited by allochthonous species that have migrated from nearby ecosystems, contributing to the area's biodiversity.
synonyms
externalforeignimported
word origin — from Greek 'allokhthonios', from 'allo-' meaning 'other' and 'khthon' meaning 'earth'