Mitochondrial gene diversity in Cepaea- population structure, history and positive selection

Previous studies on the geographical distributions of both shell polymorphisms and mitochondrial haplotypes in Cepaea land snails have suggested varying contributions of natural selection, random genetic drift and population history to the origin and persistence of variation. We combine previous stu...

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Bibliographic Details
Published in:Biological journal of the Linnean Society 2006-02, Vol.87 (2), p.167-184
Main Authors: GOODACRE, SARA L., THOMAZ, DIOGO, DAVIES, ESTHER K.
Format: Article
Language:English
Subjects:
Biological and medical sciences
Biological evolution
Cepaea
diversifying selection
Fundamental and applied biological sciences. Psychology
Genetics of eukaryotes. Biological and molecular evolution
Invertebrates
land snails
Mollusca
polymorphism
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Summary:Previous studies on the geographical distributions of both shell polymorphisms and mitochondrial haplotypes in Cepaea land snails have suggested varying contributions of natural selection, random genetic drift and population history to the origin and persistence of variation. We combine previous studies of polymorphism within two species of Cepaea, with new molecular data from two mitochondrial genes. The distributions of mitochondrial variants suggest that elements of population history may have been influential in creating patterns of diversity. However, some patterns of amino acid substitution that are found in a protein coding gene are also consistent with the action of diversifying selection. This suggests the possibility that in addition to stochastic processes such as repeated founder events, local extinctions and random genetic drift within a structured population, adaptive molecular change may have affected mitochondrial diversity. © 2006 The Linnean Society of London, Biological Journal of the Linnean Society, 2006, 87, 167–184.
ISSN:0024-4066
1095-8312
DOI:10.1111/j.1095-8312.2006.00565.x