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

Molecular Ecology
Gilbert SmithMichael G Ritchie

Abstract

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 o...Continue Reading

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Citations

Oct 29, 2013·Annual Review of Entomology·Sean P Mullen, Kerry L Shaw
Nov 29, 2015·Molecular Ecology·William J EtgesAllen G Gibbs
Apr 25, 2013·Molecular Ecology·Rose L AndrewLoren H Rieseberg
Jul 3, 2013·Evolution; International Journal of Organic Evolution·Gilbert SmithMichael G Ritchie
Mar 22, 2014·Molecular Ecology·Tara A Pelletier, Bryan C Carstens
Dec 3, 2014·Molecular Ecology·William J EtgesShripad Tuljapurkar
Apr 1, 2015·Evolution; International Journal of Organic Evolution·Konrad LohseWilliam J Etges
Jan 2, 2015·Genome Biology and Evolution·Yolanda GuillénAlfredo Ruiz
Sep 2, 2016·Proceedings. Biological Sciences·Amber Crowley-GallStephanie M Rollmann
Oct 10, 2018·The Journal of Heredity·Amber Crowley-GallStephanie M Rollmann
Nov 30, 2018·The Journal of Heredity·Juan Francisco OrnelasAntonio Acini Vásquez-Aguilar
Mar 31, 2019·G3 : Genes - Genomes - Genetics·Kyle M BenowitzLuciano M Matzkin
Nov 7, 2019·Systematic Biology·Luke C CampilloRobert C Thomson
Aug 15, 2018·Journal of Insect Physiology·Daniel C NemethStephanie M Rollmann
Sep 23, 2019·Current Opinion in Insect Science·William J Etges

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