Biological or physiographic features that split populations into widely spread and eventually discrete entities; may lead to new races, then into speciation[2].
References[]
^Dodd, D.M.B. (1989) "Reproductive isolation as a consequence of adaptive divergence in Drosophila pseudoobscura." Evolution 43:1308–1311. [1]
^Simpson & Day (1999). A Field Guide to the Birds of Australia, 6th Edition. Penguin. ISBN0-691-04995-5.
This article is part of Project Glossary, an All Birds project that aims to write comprehensive articles on each term related to animals.