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The Adobe Flash Player is required in order to view this content. You can get it here: vicarianceOne entry found. Main Entry: vi·car·i·ance Pronunciation: \-ē-ən(t)s\ Function: noun Date: 1957 : 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 
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