vicariance

noun vi·car·i·ance \ vī-ˈker-ē-ən(t)s , və- \

Definition of vicariance

: fragmentation of the environment (as by splitting of a tectonic plate) in contrast to dispersal as a factor in promoting biological evolution by division of large populations into isolated subpopulations called also vicariance biogeography

First Known Use of vicariance

1957

in the meaning defined above

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