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Molecular Biology and Evolution, Vol 9, 621-635, Copyright © 1992 by Society for Molecular Biology and Evolution

ORIGINAL ARTICLE

Phylogenetic reconstruction of the Drosophila obscura group, on the basis of mitochondrial DNA

E Barrio, A Latorre, A Moya and FJ Ayala
Department de Genetica, Facultat de Biologia, Universitat de Valencia.

We have constructed restriction-site maps of the mtDNAs in 13 species and one subspecies of the Drosophila obscura group. The traditional division of this group into two subgroups (affinis and obscura) does not correspond to the phylogeny of the group, which shows two well- defined clusters (the Nearctic affinis and pseudoobscura subgroups) plus a very heterogeneous set of anciently diverged species (the Palearctic obscura subgroup). The mtDNA of Drosophila exhibits a tendency to evolve toward high A+T values. This leads to a "saturation" effect that (1) begets an apparent decrease in the rate of evolution as the time since the divergence of taxa increases and (2) reduces the value that mtDNA restriction analysis has for the phylogenetic reconstruction of Drosophila species that are not closely related.
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