Long Zhiqin, Rieseberg Loren H
Department of Botany and Biodiversity Research Centre, University of British Columbia, Vancouver, British Columbia, Canada.
Mol Ecol. 2024 May 23:e17412. doi: 10.1111/mec.17412.
Homoploid hybrid speciation is challenging to document because hybridization can lead to outcomes other than speciation. Thus, some authors have argued that establishment of homoploid hybrid speciation should include evidence that reproductive barriers isolating the hybrid neo-species from its parental species were derived from hybridization. While this criterion is difficult to satisfy, several recent papers have successfully employed a common pipeline to identify candidate genes underlying such barriers and (in one case) to validate their function. We describe this pipeline, its application to several plant and animal species and what we have learned about homoploid hybrid speciation as a consequence. We argue that - given the ubiquity of admixture and the polygenic basis of reproductive isolation - homoploid hybrid speciation could be much more common and more protracted than suggested by earlier conceptual arguments and theoretical studies.
同倍体杂交物种形成难以记录，因为杂交可能导致除物种形成之外的其他结果。因此，一些作者认为，同倍体杂交物种形成的确立应包括证据表明，将杂交新物种与其亲本物种隔离开的生殖隔离源自杂交。虽然这一标准难以满足，但最近有几篇论文成功采用了一个通用流程来识别这些隔离障碍背后的候选基因，并（在一个案例中）验证了它们的功能。我们描述了这个流程、它在几种植物和动物物种中的应用以及我们由此对同倍体杂交物种形成的了解。我们认为，鉴于混合现象的普遍存在以及生殖隔离的多基因基础，同倍体杂交物种形成可能比早期概念性论证和理论研究所表明的更为常见和持久。
