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Divergence in male sexual odor signal and genetics across populations of the red mason bee, Osmia bicornis, in Europe

Title data

Conrad, Taina ; Paxton, Robert J. ; Assum, Günter ; Ayasse, Manfred:
Divergence in male sexual odor signal and genetics across populations of the red mason bee, Osmia bicornis, in Europe.
In: PLoS One. Vol. 13 (2018) Issue 2 .
ISSN 1932-6203
DOI: https://doi.org/10.1371/journal.pone.0193153

Abstract in another language

In some insect species, females may base their choice for a suitable mate on male odor. In the red mason bee, Osmia bicornis, female choice is based on a male’s odor bouquet as well as its thorax vibrations, and its relatedness to the female, a putative form of optimal outbreeding. Interestingly, O. bicornis can be found as two distinct color morphs in Europe, which are thought to represent subspecies and between which we hypothesize that female discrimination may be particularly marked. Here we investigated (i) if these two colors morphs do indeed represent distinct, reproductively differentiated populations, (ii) how odor bouquets of male O. bicornis vary within and between populations, and (iii) whether variation in male odor correlates with genetic distance, which might represent a cue by which females could optimally outbreed. Using GC and GC-MS analysis of male odors and microsatellite analysis of males and females from 9 populations, we show that, in Denmark, an area of subspecies sympatry, the two color morphs at any one site do not differ, either in odor bouquet or in population genetic differentiation. Yet populations across Europe are distinct in their odor profile as well as being genetically differentiated. Odor differences do not, however, mirror genetic differentiation between populations. We hypothesize that populations from Germany, England and Denmark may be under sexual selection through female choice for local odor profiles, which are not related to color morph though which could ultimately lead to population divergence and speciation.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER148111
Institutions of the University: Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Result of work at the UBT: No
DDC Subjects: 500 Science
Date Deposited: 02 May 2019 09:59
Last Modified: 02 May 2019 09:59
URI: https://eref.uni-bayreuth.de/id/eprint/48161