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vicariance

[vahy-kair-ee-uh ns, vi-] /vaɪˈkɛər i əns, vɪ-/
noun, Biology
1.
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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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vicariance in Science
vicariance
  (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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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