THE GENETIC BASIS OF BEHAVIORAL ISOLATION BETWEEN DROSOPHILA MAURITIANA AND D. SECHELLIA
Article first published online: 29 APR 2012
© 2012 The Author(s).
Volume 66, Issue 7, pages 2182–2190, July 2012
How to Cite
McNabney, D. R. (2012), THE GENETIC BASIS OF BEHAVIORAL ISOLATION BETWEEN DROSOPHILA MAURITIANA AND D. SECHELLIA. Evolution, 66: 2182–2190. doi: 10.1111/j.1558-5646.2012.01600.x
- Issue published online: 3 JUL 2012
- Article first published online: 29 APR 2012
- Accepted manuscript online: 17 FEB 2012 05:15PM EST
- Received April 14, 2011 Accepted January 24, 2012; Data Archived: Dryad:doi:10.5061/dryad.7b5s1s4r
- KEY WORDS: Behavioral genetics;
- prezygotic isolation;
- QTL mapping;
- sexual isolation;
Understanding how species form is a fundamental question in evolutionary biology. Identifying the genetic bases of barriers that prevent gene flow between species provides insight into how speciation occurs. Here, I analyze a poorly understood reproductive isolating barrier, prezygotic reproductive isolation. I perform a genetic analysis of prezygotic isolation between two closely related species of Drosophila, D. mauritiana and D. sechellia. I first confirm the existence of strong behavioral isolation between D. mauritiana females and D. sechellia males. Next, I examine the genetic basis of behavioral isolation by (1) scanning an existing set of introgression lines for chromosomal regions that have a large effect on isolation; and (2) mapping quantitative trait loci (QTL) that underlie behavioral isolation via backcross analysis. In particular, I map QTL that determine whether a hybrid backcross female and a D. sechellia male will mate. I identify a single significant QTL, on the X chromosome, suggesting that few major-effect loci contribute to behavioral isolation between these species. In further work, I refine the map position of the QTL to a small region of the X chromosome.