Sexual selection on song and cuticular hydrocarbons in two distinct populations of Drosophila montana
Veltsos, P., Wicker-Thomas, C., Butlin, R., Hoikkala, A., & Ritchie, M. (2012). Sexual selection on song and cuticular hydrocarbons in two distinct populations of Drosophila montana. Ecology and Evolution, 2(1), 80-94. https://doi.org/10.1002/ece3.75
Published inEcology and Evolution
© 2011 The Authors. Published by Blackwell Publishing Ltd. This is an Open Access article under the terms of the Creative Commons Attribution Non Commercial License which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
Sexual selection has the potential to contribute to population divergence and speciation. Most studies of sexual selection in Drosophila have concentrated on a single signaling modality, usually either courtship song or cuticular hydrocarbons (CHCs), which can act as contact pheromones. We have examined the relationship between both signal types and reproductive success using F1–3 offspring of wild‐collected flies, raised in the lab. We used two populations of the Holarctic species Drosophila montana that represent different phylogeographic clades that have been separate for ca. 0.5 million years (MY), and differ to some extent in both traits. Here, we characterize the nature and identify the targets of sexual selection on song, CHCs, and both traits combined within the populations. Three measures of courtship outcome were used as fitness proxies. They were the probability of mating, mating latency, and the production of rejection song by females, and showed patterns of association with different traits that included both linear and quadratic selection. Courtship song predicted courtship outcome better than CHCs and the signal modalities acted in an additive rather than synergistic manner. Selection was generally consistent in direction and strength between the two populations and favored males that sang more vigorously. Sexual selection differed in the extent, strength, and nature on some of the traits between populations. However, the differences in the directionality of selection detected were not a good predictor of population differences. In addition, a character previously shown to be important for species recognition, interpulse interval, was found to be under sexual selection. Our results highlight the complexity of understanding the relationship between within‐population sexual selection and population differences. Sexual selection alone cannot predict differences between populations. ...
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Additional information about fundingFunded by the National Environment Research Council (grant NE/E015255/1 to M.G.R. and R.K.B.) to P.V.
Except where otherwise noted, this item's license is described as © 2011 The Authors. Published by Blackwell Publishing Ltd. This is an Open Access article under the terms of the Creative Commons Attribution Non Commercial License which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
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