Reinforcement can overcome gene flow during speciation in Drosophila.
Reinforcement can overcome gene flow during speciation in Drosophila.
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DOI：
10.1016/j.cub.2010.11.036
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发表时间：
2010-12-21
期刊：
影响因子：
9.2
通讯作者：
Matute, Daniel R.
中科院分区：
文献类型：
--
作者：
Matute, Daniel R.
强化，即通过自然选择加强前合子生殖隔离以应对不适应杂交，是自然选择直接支持物种作为离散群体进化的少数过程之一[例如，]。在两个物种范围重叠和杂交的地区，通过强化的生殖障碍的进化被认为是一种避免不适应杂交代价的进化解决方案。然而，强化在物种形成中的作用一直备受争议，因为种群遗传学理论表明，这一过程受到来自接触区以外个体的杂交和迁移的严重阻碍。为了确定强化是否能够在这些障碍面前加强两个姐妹种之间的繁殖障碍，我启动了这两个物种的实验种群，允许不同程度的杂交以及从外部种群迁移。令人惊讶的是，即使面对基因流动，强化也能在五代内促进生殖隔离的进化。正如理论预测的那样，高水平的杂交（和/或对杂交的强选择）和迁移阻碍了这种进化。这些结果表明，强化可以帮助完成物种形成过程。
Reinforcement, the strengthening of prezygotic reproductive isolation by natural selection in response to maladaptive hybridization, is one of the few processes in which natural selection directly favors the evolution of species as discrete groups [e.g., ]. The evolution of reproductive barriers via reinforcement is expected to evolve in regions where the ranges of two species overlap and hybridize, as an evolutionary solution to avoiding the costs of maladaptive hybridization. The role of reinforcement in speciation has, however, been highly controversial because population-genetic theory suggests that the process is severely impeded by both hybridization and migration of individuals from outside the contact zone. To determine whether reinforcement could strengthen the reproductive barriers between two sister species of Drosophila in the face of these impediments, I initiated experimental populations of these two species that allowed different degrees of hybridization as well as migration from outside populations. Surprisingly, even in the face of gene flow, reinforcement could promote the evolution of reproductive isolation within only five generations. As theory predicts, high levels of hybridization (and/or strong selection against hybrids) and migration impeded this evolution. These results suggest that reinforcement can help complete the process of speciation.
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DOI：
10.1098/rspb.2003.2457
发表时间：
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影响因子：
4.7
作者：
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通讯作者：
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影响因子：
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影响因子：
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作者：
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