Species recognition limits mating between hybridizing ant species

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Version: Final published version
License: CC BY 4.0
Serval ID
serval:BIB_D11C7FD7D12C
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Species recognition limits mating between hybridizing ant species
Journal
Evolution; international journal of organic evolution
Author(s)
Blacher P., Zahnd S., Purcell J., Avril A., Honorato T.O., Bailat-Rosset G., Staedler D., Brelsford A., Chapuisat M.
ISSN
1558-5646 (Electronic)
ISSN-L
0014-3820
Publication state
Published
Issued date
2022
Peer-reviewed
Oui
Volume
76
Pages
2105-2115
Language
english
Notes
Publication types: Journal Article
Publication Status: aheadofprint
Abstract
Identifying mechanisms limiting hybridization is a central goal of speciation research. Here, we studied pre-mating and post-mating barriers to hybridization between two ant species, Formica selysi and Formica cinerea. These species hybridize in the Rhône valley in Switzerland, where they form a mosaic hybrid zone, with limited introgression from F. selysi into F. cinerea. There was no sign of temporal isolation between the two species in the production of queens and males. With choice experiments, we showed that queens and males strongly prefer to mate with conspecifics. Yet, we did not detect post-mating barriers caused by genetic incompatibilities. Specifically, hybrids of all sexes and castes were found in the field and F1 hybrid workers did not show reduced viability compared to non-hybrid workers. To gain insights into the cues involved in species recognition, we analyzed the cuticular hydrocarbons of queens, males and workers and staged dyadic encounters between workers. Cuticular hydrocarbon profiles differed markedly between species, but were similar in F. cinerea and hybrids. Accordingly, workers also discriminated species, but they did not discriminate F. cinerea and hybrids. We discuss how the CHC-based recognition system of ants may facilitate the establishment of pre-mating barriers to hybridization, independent of hybridization costs. This article is protected by copyright. All rights reserved.
Keywords
General Agricultural and Biological Sciences, Genetics, Ecology, Evolution, Behavior and Systematics, Formica ants, Hybrid zone, assortative mating, hydrocarbon cues, speciation, species recognition
Pubmed
Open Access
Yes
Create date
13/07/2022 12:48
Last modification date
07/09/2022 6:13
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