vicariance

vicariance

[vahy-kair-ee-uhns, vi-]
noun Biology.
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.

vicariant, adjective, noun
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World English Dictionary
vicariant (vɪˈkɛərɪənt, vaɪ-)
 
n
any of several closely related species, races, etc, each of which exists in a separate geographical area: assumed to have originated from a single population that became dispersed by geological events
 
[C20: from Latin vicārius (see vicar) + -ant]
 
vi'cariance
 
n

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American Heritage
Science Dictionary
vicariance   (vī-kâr'ē-əns, vĭ-)  Pronunciation Key 
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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