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- Title
Phylogeographic structure without pre-mating barriers: Do habitat fragmentation and low mobility preserve song and chorus diversity in a European bushcricket?
- Authors
Mahamoud-Issa, Mathieu; Marin-Cudraz, Thibaut; Party, Virginie; Greenfield, Michael
- 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.
- Subjects
AUDITORY adaptation; GLOBAL warming; FRAGMENTED landscapes; REPRODUCTIVE allocation; SEXUAL selection
- Publication
Evolutionary Ecology, 2017, Vol 31, Issue 6, p865
- ISSN
0269-7653
- Publication type
Article
- DOI
10.1007/s10682-017-9914-3