0100478200

open access

Accepted Manuscript

Reproductive isolation via divergent genital morphology due to cascade reinforcement in Ohomopterus ground beetles

English (英語)

Journal of Evolutionary Biology

36(1)

169-182

John Wiley & Sons

2023-01

2023-11-10

Secondary contact between incipient species and selection against maladaptive hybridization can drive reinforcement between populations in contact and result in reproductive character displacement (RCD). Resultant divergence in mating traits within a species may generate downstream reproductive isolation between populations with displaced and non-displaced traits, referred to as the cascade reinforcement hypothesis. We examined this hypothesis using three allopatric populations of the ground beetle Carabus maiyasanus with a genital lock-and-key system. This species shows RCD in male and female genital morphologies in populations in contact with the sister species C. iwawakianus. In a reciprocal mating experiment using three allopatric populations with differences in male and female genital sizes, insemination failure increased as the difference in genital size increased. Based on the reproductive isolation index, insemination failure was the major postmating-prezygotic isolation barrier, at least in one population pair with comparable total isolation to those of other species pairs. By contrast, there was only incomplete premating isolation among populations. These results suggest that RCD in genital morphologies drives incipient allopatric speciation, supporting the cascade reinforcement hypothesis. These findings provide insight into the roles of interspecific interactions and subsequent trait diversification in speciation processes.

reproductive interference

学術雑誌論文

This is the peer reviewed version of the following article: [Xia, T., Nishimura, T., Nagata, N., Kubota, K., Sota, T., & Takami, Y. (2023). Reproductive isolation via divergent genital morphology due to cascade reinforcement in Ohomopterus ground beetles. Journal of Evolutionary Biology, 36, 169–182.], which has been published in final form at [https://doi.org/10.1111/jeb.14116]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.