The evolutionary history of Drosophila buzzatii. XXX. Mitochondrial DNA polymorphism in original and colonizing populations

Molecular Biology and Evolution
M S RossiA Fontdevila

Abstract

Both original and colonizer populations of Drosophila buzzatii have been analyzed for mtDNA restriction polymorphisms. Most of the mtDNA nucleotide variation in original populations of NW Argentina can be explained by intrapopulation diversity and only a small fraction can be accounted for by between-population diversity. Similar results are obtained using either the estimated number of nucleotide substitutions per site or considering each restriction site as a locus. Colonizer populations of the Iberian Peninsula are monomorphic and show only the most common haplotype from the original populations. Under the infinite island model and assuming that populations are in equilibrium, fixation indices indicate enough gene flow to explain why the populations are not structured. Yet, the possibility exists that populations have not reached an equilibrium after a founder event at the end of the last Pleistocene glaciation. Tajima's test suggests that directional selection and/or a recent bottleneck could explain the present mtDNA differentiation. Considering the significant population structure found for the chromosomal and some allozyme polymorphisms, the among-population uniformity for mtDNA variability argues in favor of the chromos...Continue Reading

Citations

Aug 11, 2000·Evolution; International Journal of Organic Evolution·S D Maskas, M B Cruzan
Sep 27, 2000·Evolution; International Journal of Organic Evolution·P Fernández Iriarte, E Hasson
Jan 5, 2006·Genome Génome / Conseil National De Recherches Canada·S M PenselM I Remis

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