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Two subspecies of the meadow grasshopper Chorthippus parallelus meet in a secondary hybrid zone in the Pyrenees. We have recently detected Wolbachia infection in this extensively studied species. C. p. parallelus (Cpp) and C. p. erythropus (Cpe) harbour bacteria from the B and F supergroups, but they differ noticeably in the incidence and type of infection present in their populations. We can distinguish different regional infection patterns that are associated with the distribution of pure and hybrid C. parallelus individuals. The northern pattern of low-level infection characterizes Cpp populations, whereas the southern pattern of high-level infection affects Cpe locations. These patterns converge in the hybrid zone and generate a third infection pattern featuring an extremely high degree of co-infection with the two Wolbachia types in hybrids. The distribution of Wolbachia among the studied populations encourages us to consider the possibility that this bacterium has a significant influence on the origin, maintenance and dynamics of this hybrid zone, given the reproductive alterations that are often associated with Wolbachia.

Distribution of Wolbachia infection in Chorthippus parallelus populations within and beyond a Pyrenean hybrid zone