Equally contributing authors.
Multiple hybridization events between Drosophila simulans and Drosophila mauritiana are supported by mtDNA introgression
Article first published online: 7 OCT 2010
© 2010 Blackwell Publishing Ltd
Volume 19, Issue 21, pages 4695–4707, November 2010
How to Cite
NUNES, M. D. S., OROZCO-TER WENGEL, P., KREISSL, M. and SCHLÖTTERER, C. (2010), Multiple hybridization events between Drosophila simulans and Drosophila mauritiana are supported by mtDNA introgression. Molecular Ecology, 19: 4695–4707. doi: 10.1111/j.1365-294X.2010.04838.x
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- Issue published online: 19 OCT 2010
- Article first published online: 7 OCT 2010
- Received 4 March 2010; revision received 17 June 2010; accepted 19 June 2010
- Drosophila mauritiana;
- Drosophila simulans;
The study of speciation has advanced considerably in the last decades because of the increased application of molecular tools. In particular, the quantification of gene flow between recently diverged species could be addressed. Drosophila simulans and Drosophila mauritiana diverged, probably allopatrically, from a common ancestor approximately 250 000 years ago. However, these species share one mitochondrial DNA (mtDNA) haplotype indicative of a recent episode of introgression. To study the extent of gene flow between these species, we took advantage of a large sample of D. mauritiana and employed a range of different markers, i.e. nuclear and mitochondrial sequences, and microsatellites. This allowed us to detect two new mtDNA haplotypes (MAU3 and MAU4). These haplotypes diverged quite recently from haplotypes of the siII group present in cosmopolitan populations of D. simulans. The mean divergence time of the most diverged haplotype (MAU4) is approximately 127 000 years, which is more than 100 000 years before the assumed speciation time. Interestingly, we also found some evidence for gene flow at the nuclear level because an excess of putatively neutral loci shows significantly reduced differentiation between D. simulans and D. mauritiana. Our results suggest that these species are exchanging genes more frequently than previously thought.