Send to

Choose Destination
Mol Ecol. 2012 Jul;21(13):3293-307. doi: 10.1111/j.1365-294X.2012.05604.x. Epub 2012 May 9.

Model-based comparisons of phylogeographic scenarios resolve the intraspecific divergence of cactophilic Drosophila mojavensis.

Author information

School of Biology, University of St. Andrews, St. Andrews KY16 9TH, UK.


The cactophilic fly Drosophila mojavensis exhibits considerable intraspecific genetic structure across allopatric geographic regions and shows associations with different host cactus species across its range. The divergence between these populations has been studied for more than 60years, yet their exact historical relationships have not been resolved. We analysed sequence data from 15 intronic X-linked loci across populations from Baja California, mainland Sonora-Arizona and Mojave Desert regions under an isolation-with-migration model to assess multiple scenarios of divergence. We also compared the results with a pre-existing sequence data set of eight autosomal loci. We derived a population tree with Baja California placed at its base and link their isolation to Pleistocene climatic oscillations. Our estimates suggest the Baja California population diverged from an ancestral Mojave Desert/mainland Sonora-Arizona group around 230,000-270,000years ago, while the split between the Mojave Desert and mainland Sonora-Arizona populations occurred one glacial cycle later, 117,000-135,000years ago. Although we found these three populations to be effectively allopatric, model ranking could not rule out the possibility of a low level of gene flow between two of them. Finally, the Mojave Desert population showed a small effective population size, consistent with a historical population bottleneck. We show that model-based inference from multiple loci can provide accurate information on the historical relationships of closely related groups allowing us to set into historical context a classic system of incipient ecological speciation.

[Indexed for MEDLINE]

Publication types, MeSH terms, Secondary source ID

Publication types

MeSH terms

Secondary source ID

LinkOut - more resources

Full Text Sources

Other Literature Sources

Molecular Biology Databases

Supplemental Content

Full text links

Icon for Wiley
Loading ...
Support Center