Abstract
When animal species have a strong phylogeographic structure questions arise on the origin, maintenance and future evolutionary trajectory of that structure. One prediction is that phenotypic differences among populations serve as pre-mating barriers should secondary contact occur. Post-mating barriers may also function and ensure further separation of the populations. We tested these predictions in an acoustic insect, the European bushcricket Ephippiger diurnus, that is geographically distributed in separated, genetically isolated populations distinguished by pronounced differences in male songs and chorusing and female preferences for song. We staged mixed-population choruses to examine how males sing when in the company of other populations, and we released females in these choruses to assess their preference for or aversion toward males of their own population versus a different one. We also paired males and females of the same and different populations to test mating success, spermatophore transfer, and oviposition in the various pairings. In most cases males sang as effectively when accompanied by males from another population as when in a single-population chorus, and females overall expressed little aversion toward males from a different population. Inter-population pairs did not mate less frequently, transfer smaller spermatophores, or deposit fewer or smaller eggs than pairs of males and females from the same population. We infer that pre-mating barriers play little role in maintaining phylogeographic structure despite the acoustic differences between populations. Rather, the structure probably reflects the fragmented distribution of suitable habitat and the low mobility of both juveniles and adults. Thus, if secondary contact does occur, and we predict that it will in several key locations owing to ongoing environmental change, coalescence of populations and reduction of genetic and acoustic diversity may follow.
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Acknowledgements
We thank Flavia Barbosa, Guy Bourdais, Marine Deluen, Séverine Devers, Caroline Hébert for technical assistance in the laboratory, Guillaume Baudouin for helping to prepare the maps shown in Fig. 2a, Christophe Bressac and Claude Chevrier for making laboratory space available, Jean-Paul Monge for his special interest in the project, and the Agence Nationale de la Recherche de France (contrat ANR-11-BSV7-025-01; EVOLCHOR), the Centre National de la Recherche Scientifique (CNRS), and the Université François Rabelais de Tours for their financial support. Flavia Barbosa, Raphael Boulay, Yareli Esquer-Garrigos, Darren Rebar, Réjane Streiff, Matthew Symonds and several anonymous referees provided valuable criticisms of earlier versions of this manuscript.
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This study was funded by Grant ANR-11-BSV7-025-01 from the Agence Nationale de la Recherche de France.
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Mahamoud-Issa, M., Marin-Cudraz, T., Party, V. et al. Phylogeographic structure without pre-mating barriers: Do habitat fragmentation and low mobility preserve song and chorus diversity in a European bushcricket?. Evol Ecol 31, 865–884 (2017). https://doi.org/10.1007/s10682-017-9914-3
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DOI: https://doi.org/10.1007/s10682-017-9914-3