Multilocus analysis of nucleotide variation in Drosophila madeirensis, an endemic species of the Laurisilva forest in Madeira

Khadem, M.; Munté, A.; Camacho, R.; Aguadé, M.; Segarra, C.

http://hdl.handle.net/10400.13/3689

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Abstract(s)

Drosophila madeirensis is an endemic species of Madeira that inhabits the island Laurisilva forest. Nucleotide variation in D. madeirensis is analysed in six genomic regions and compared to that previously reported for the same regions in Drosophila subobscura, an abundant species in the Palearctic region that is closely related to D. madeirensis. The gene regions analysed are distributed along the O3 inversion. The O3 arrangement is monomorphic in D. madeirensis, and it was present in ancestral populations of D. subobscura but went extinct in this species after the origin of the derived OST and O3+4 arrangements. Levels of nucleotide polymorphism in D. madeirensis are similar to those present in the OST and O3+4 arrangements of D. subobscura, and the frequency spectrum is skewed towards rare variants. Purifying selection against deleterious nonsynonymous mutations is less effective in D. madeir ensis. Although D. madeirensis and D. subobscura coexist at present in Madeira, no clear evidence of introgression was detected in the studied regions.

Keywords

DNA divergence DNA polymorphism Introgression Molecular evolution Speciation . Faculdade de Ciências da Vida

URI

http://hdl.handle.net/10400.13/3689

Citation

Khadem, M., Munte, A., Camacho, R., Aguade, M., & Segarra, C. (2012). Multilocus analysis of nucleotide variation in Drosophila madeirensis, an endemic species of the Laurisilva forest in Madeira. Journal of evolutionary biology, 25(4), 726-739. DOI: 10.1111/j.1420-9101.2012.02467.x