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Additional recommended knowledge
Parapatric speciation is a form of speciation that occurs due to variations in mating frequency of a population within a continuous geographical area.
In this model, the parent species lives in a continuous habitat, in contrast with allopatric speciation where subpopulations become geographically isolated.
An example of this is the grass Anthoxanthum, which has been known to undergo parapatric speciation in such cases as mine contamination of an area. This creates a selection pressure for tolerance to those metals. Flowering time generally changes (in an attempt at character displacement—strong selection against interbreeding—as the hybrids are generally ill-suited to the environment) and often plants will become self-pollinating.
Another example is ring species.
"Parapatric speciation." in Understanding Evolution at evolution.berkeley.edu
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Parapatric_speciation". A list of authors is available in Wikipedia.|