Profiles of cuticular hydrocarbons mediate male mate choice and sexual isolation between hybridising <Emphasis Type="Italic">Chrysochus</Emphasis> (Coleoptera: Chrysomelidae) |
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Authors: | Merrill A Peterson Susanne Dobler Erica L Larson Danielle Juárez Tim Schlarbaum Kirsten J Monsen Wittko Francke |
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Institution: | 1.Biology Department,Western Washington University,Bellingham,USA;2.Biozentrum Grindel,Universit?t Hamburg,Hamburg,Germany;3.Department of Ecology and Evolutionary Biology,Cornell University,Ithaca,USA;4.Department of Biology and Molecular Biology,Montclair State University,Montclair,USA;5.Institute of Organic Chemistry,University of Hamburg,Hamburg,Germany |
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Abstract: | Summary. Chemical signals frequently underlie sexual isolation between insect species. Our understanding of the evolutionary forces
influencing these signaling systems is known for very few systems, challenging both our efforts to understand insect speciation,
and our ability to predict long-term changes in the chemical communication systems of insects. Thus, we are in need of more
systems in which both the chemical signals causing sexual isolation and the evolutionary forces driving sexual isolation are
understood. Sexual isolation in the hybrid zone between Chrysochus cobaltinus and C. auratus has apparently increased in response to natural selection against hybridisation (i.e. reinforcement). Previous experiments
suggested that this isolation was due, at least in part, to male preferences for conspecific females. Here, we confirm this
role of male choice, and document that male mate choice in this system is influenced by cuticular hydrocarbon (CHC) profiles.
Specifically, male C. cobaltinus responses to control cadavers and conspecific female cadavers painted with different cuticular hexane extracts, together
with analyses of the composition of those extracts, revealed that male mate choice is governed by CHC profiles. Multivariate
analyses of GC profiles demonstrated that those profiles are indeed both sex- and species-specific. Although GC-MS enabled
identification and quantification of the specific cuticular hydrocarbons, we have not yet determined which individual compounds
govern mate choice. Having established that CHCs influence sexual isolation in this system, we can now assess the evolutionary
lability of these cues, which will inform both our understanding of speciation, and of the conditions under which the chemical
signaling systems that influence mate choice in insects can evolve. |
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Keywords: | Assortative mating cuticular hydrocarbons hybridisation sexual isolation Chrysochus auratus Chrysochus cobaltinus Chrysomelidae |
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