Evidence for no sexual isolation between Drosophila albomicans and D. nasuta Yong-Kyu Kim1,3, Dennis R. Phillips2 & Yun Tao1 1Department of Biology, Emory University, Atlanta, Georgia 30322 2Department of Chemistry, University of Georgia, Athens, Georgia 30602 3Present address: Howard Hughes Medical Institute, Janelia Farm Research Campus, 19700 Helix Drive, Ashburn, Virginia 20147 Keywords Abstract Courtship, cuticular hydrocarbons, D. albomicans, D. nasuta, mating behavior, Sexual isolation, the reduced tendency to mate, is one of the reproductive barri- speciation. ers that prevent gene flow between different species. Various species-specific sig- nals during courtship contribute to sexual isolation between species. Drosophila Correspondence albomicans and D. nasuta are closely related species of the nasuta subgroup Yong-Kyu Kim, Howard Hughes Medical within the Drosophila immigrans group and are distributed in allopatry. We Institute, Janelia Farm Research Campus, analyzed mating behavior and courtship as well as cuticular hydrocarbon 19700 Helix Drive, Ashburn, VA 20147. profiles within and between species. Here, we report that these two species Tel: (571) 209-4180; Fax: (571) 209-4941; E-mail:
[email protected] randomly mated with each other. We did not observe any sexual isolation between species or between strains within species by multiple-choice tests. Significant Funding Information difference in the courtship index was detected between these two species, but This study was supported by National males and females of both species showed no discrimination against heterospec- Institutes of Health R01 HD060679. ific partners. Significant quantitative variations in cuticular hydrocarbons between these two species were also found, but the cuticular hydrocarbons Received: 18 February 2013; Revised: 22 April 2013; Accepted: 1 May 2013 appear to play a negligible role in both courtship and sexual isolation between these two species.