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MBE Advance Access published online on July 17, 2007
Molecular Biology and Evolution, doi:10.1093/molbev/msm143
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© The Author 2007. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Research Article

Locus- and Population-Specific Selection and Differentiation Between Incipient Species of Anopheles gambiae

Thomas L. Turner* and Matthew W. Hahn{dagger}

* Center for Population Biology, University of California, Davis, CA 95616
{dagger} Department of Biology and School of Informatics, Indiana University, Bloomington, IN 47405

Corresponding author: Center for Population Biology, 2320 Storer Hall, University of California, Davis, CA 95616. Phone: 530-754-9551, Fax: 530-754-1449, E-mail: tlturner{at}ucdavis.edu

Received for publication February 27, 2007. Revision received July 10, 2007. Accepted for publication July 12, 2007.

Anopheles gambiae, the primary mosquito vector of malaria in sub-Saharan Africa, is divided into two sympatric incipient species known as M form and S form. Recent genomic analysis of each form revealed that differentiation between forms is clustered into three unlinked regions of the genome. Here we expand the investigation of these "genomic islands of speciation" to multiple populations, including all of the genes across one of the islands. Differentiation between the M and S forms in two of the islands is complete across all individuals in all populations, confirming that the M and S forms are reproductively isolated taxa. Differentiation at the third island (on chromosome 2R) is limited to Cameroon populations. There is reduced variation in the M form in Cameroon at this location, and increased divergence to the outgroup A. arabiensis, supporting an association of adaptation with reproductive isolation.

Key Words: speciation • mosquito • population genetics • natural selection


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