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area-effect speciation

area-effect speciation

A Dictionary of Ecology | 2004 | | Copyright

area-effect speciation Speciation by the increased differentiation of two subspecies with incompatible gene complexes, so that selection is strongly against hybrids. The phenomenon is observed among slow-moving or sedentary organisms (e.g. snails and plants) occupying areas of habitat that remain unchanged for long periods (sometimes thousands of years) and within which stable local populations of particular polymorphs occur. As a result of strong selection for certain loci (see locus), particular alleles become more frequent, together with those genes that are compatible with them, thus forming gene complexes and consequent heterogeneity among the polymorphic populations. The fecundity of hybrids is low and a steep cline develops, sometimes over a distance of metres.
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MICHAEL ALLABY. "area-effect speciation." A Dictionary of Ecology. 2004. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

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MICHAEL ALLABY. "area-effect speciation." A Dictionary of Ecology. 2004. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O14-areaeffectspeciation.html

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area-effect speciation

A Dictionary of Zoology | 1999 | | Copyright

area-effect speciation Speciation that is associated with an increased differentiation of two subspecies that have incompatible gene complexes, so that hybrids are strongly selected against.
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MICHAEL ALLABY. "area-effect speciation." A Dictionary of Zoology. 1999. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "area-effect speciation." A Dictionary of Zoology. 1999. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O8-areaeffectspeciation.html

MICHAEL ALLABY. "area-effect speciation." A Dictionary of Zoology. 1999. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-areaeffectspeciation.html

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area-effect speciation

A Dictionary of Plant Sciences | 1998 | | Copyright

area-effect speciation The speciation by increased differentiation of two subspecies with incompatible gene-complexes, so that selection is strongly against hybrids.
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MICHAEL ALLABY. "area-effect speciation." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "area-effect speciation." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O7-areaeffectspeciation.html

MICHAEL ALLABY. "area-effect speciation." A Dictionary of Plant Sciences. 1998. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O7-areaeffectspeciation.html

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