vicariance[vahy-kair-ee-uh ns, vi-] /vaɪˈkɛər i əns, vɪ-/ Show IPA
the geographical separation and isolation of a subpopulation, resulting in the original population's differentiation as a new variety or species.
Also called vicariance biogeography.
Related forms vicariant, adjective, noun
(vī-kâr'ē-əns, vĭ-) The separation or division of a group of organisms by a geographic barrier, such as a mountain or a body of water, resulting in differentiation of the original group into new varieties or species. See also speciation.