101. Wolbachia and host intrinsic reproductive barriers contribute additively to post-mating isolation in spider mites
- Author
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Cruz, Miguel, Magalhães, Sara, Sucena, Élio, Zélé, Flore, Centre for Ecology - Evolution and Environmental Changes (cE3c), Universidade de Lisboa (ULISBOA), Departamento de Biologia Animal, Faculdade de Ciências da Universidade de Lisboa, Instituto Gulbenkian de Ciência [Oeiras] (IGC), Fundação Calouste Gulbenkian, Institut des Sciences de l'Evolution de Montpellier (UMR ISEM), École pratique des hautes études (EPHE), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre National de la Recherche Scientifique (CNRS)-Institut de recherche pour le développement [IRD] : UR226
- Subjects
[SDV.BID.EVO]Life Sciences [q-bio]/Biodiversity/Populations and Evolution [q-bio.PE] ,parasitic diseases ,[SDE.BE]Environmental Sciences/Biodiversity and Ecology ,reproductive and urinary physiology ,[SDV.BDLR.RS]Life Sciences [q-bio]/Reproductive Biology/Sexual reproduction ,[SDV.EE.IEO]Life Sciences [q-bio]/Ecology, environment/Symbiosis - Abstract
Wolbachia are widespread maternally-inherited bacteria suggested to play a role in arthropod host speciation through induction of cytoplasmic incompatibility, but this hypothesis remains controversial. Most studies addressing Wolbachia -induced incompatibilities concern closely-related populations, which are intrinsically compatible. Here, we used three populations of two genetically differentiated colour forms of the haplodiploid spider mite Tetranychus urticae to dissect the interaction between Wolbachia -induced and host-associated incompatibilities, and to assess their relative contribution to post-mating isolation. We found that these two sources of incompatibility act through different mechanisms in an additive fashion. Host-associated incompatibility contributes 1.5 times more than Wolbachia -induced incompatibility in reducing hybrid production, the former through an overproduction of haploid sons at the expense of diploid daugters ( ca . 75% decrease) and the latter by increasing the embryonic mortality of daughters (by ca . 49%). Furthermore, regardless of cross direction, we observed near-complete F1 hybrid sterility and complete F2 hybrid breakdown between populations of the two forms, but that Wolbachia did not contribute to this outcome. This study identifies the mechanistic independence and additive nature of host-intrinsic and Wolbachia -induced sources of isolation. It suggests that Wolbachia could drive reproductive isolation in this system, thereby potentially affecting host differentiation and distribution in the field.
- Published
- 2021