| Title: | Reproductive character displacement of epicuticular compounds and their contribution to mate choice in Drosophila subquinaria and Drosophila recens |
| Author(s): | Dyer KA; White BE; Sztepanacz JL; Bewick ER; Rundle HD; |
| Address: | "Department of Genetics, University of Georgia, Athens, Georgia, 30602. kdyer@uga.edu" |
| ISSN/ISBN: | 1558-5646 (Electronic) 0014-3820 (Print) 0014-3820 (Linking) |
| Abstract: | "Interactions between species can alter selection on sexual displays used in mate choice within species. Here we study the epicuticular pheromones of two Drosophila species that overlap partially in geographic range and are incompletely reproductively isolated. Drosophila subquinaria shows a pattern of reproductive character displacement against Drosophila recens, and partial behavioral isolation between conspecific sympatric versus allopatric populations, whereas D. recens shows no such variation in mate choice. First, using manipulative perfuming experiments, we show that females use pheromones as signals for mate discrimination both between species and among populations of D. subquinaria. Second, we show that patterns of variation in epicuticular compounds, both across populations and between species, are consistent with those previously shown for mating probabilities: pheromone compositions differ between populations of D. subquinaria that are allopatric versus sympatric with D. recens, but are similar across populations of D. recens regardless of overlap with D. subquinaria. We also identify differences in pheromone composition among allopatric regions of D. subquinaria. In sum, our results suggest that epicuticular compounds are key signals used by females during mate recognition, and that these traits have diverged among D. subquinaria populations in response to reinforcing selection generated by the presence of D. recens" |
| Keywords: | "Animals Choice Behavior Drosophila/*genetics/*physiology Female Genetic Speciation Male Pheromones/chemistry Reproduction/genetics Sexual Behavior, Animal/*physiology Sympatry Mate choice pheromones reinforcement sexual selection speciation;" |
| Notes: | "MedlineDyer, Kelly A White, Brooke E Sztepanacz, Jacqueline L Bewick, Emily R Rundle, Howard D eng T32 GM007103/GM/NIGMS NIH HHS/ Research Support, Non-U.S. Gov't 2013/12/20 Evolution. 2014 Apr; 68(4):1163-75. doi: 10.1111/evo.12335. Epub 2014 Jan 30" |
