Abstract
A long-standing goal of speciation research is to describe how reproductive isolating barriers develop, when they arise along the ‘speciation continuum’, and to measure the strength with which they restrict gene flow. Drosophila arizonae and D. mojavensis are a recently diverged sister species pair distributed from the southwestern United States through southern Mexico. While incipient speciation in D. mojavensis has been studied for decades, relatively little attention has been directed toward D. arizonae, despite the fact that previous studies have revealed evidence for significant genetic differentiation among populations separated by geographic barriers. Here, we examine the potential for both pre- and post-mating reproductive isolation in D. arizonae from geographically isolated parts of North America. We find evidence for strong premating isolation between flies from northern mainland Mexico and southern mainland Mexico, but no evidence for postmating isolation in any cross. This study highlights the utility of the D. arizonae system for further investigation into the early evolution of premating isolation, and reinforces the potential of the D. arizonae/D. mojavensis system as a whole for studying the evolution of reproductive isolation at a range of divergence times.
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Acknowledgments
The authors would like to thank Kim Cox, Kim Hoang, Dominic Royster, Martha Bales, and Alexis Masceranas for assistance in the lab, and Daniel Matute for helpful comments on the manuscript. This work was supported by a University of Colorado Colorado Springs Council on Research and Creative Works award to J.M.B.
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Joseph A. McGirr and Lena M. Johnson have contributed equally to this work.
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McGirr, J.A., Johnson, L.M., Kelly, W. et al. Reproductive Isolation Among Drosophila arizonae from Geographically Isolated Regions of North America. Evol Biol 44, 82–90 (2017). https://doi.org/10.1007/s11692-016-9393-4
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DOI: https://doi.org/10.1007/s11692-016-9393-4