Reproductive isolation driven by the combined effects of ecological adaptation and reinforcement
Reproductive isolation driven by the combined effects of ecological adaptation and reinforcement
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DOI：
10.1098/rspb.2003.2457
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发表时间：
2003-09-22
影响因子：
4.7
通讯作者：
Sandoval, CP
中科院分区：
文献类型：
--
作者：
Nosil, P;Crespi, BJ;Sandoval, CP
近年来，人们对物种形成过程的兴趣重新抬头，但很少有研究阐明驱动或限制生殖隔离进化的机制。从理论上讲，加强选择增加交配歧视的直接影响，即杂交产生适应度低的杂交后代，以及适应不同环境的间接影响，都可以促进物种形成。相反，高水平的基因流动可以抵消选择的力量。我们证明了相反的效果，加强选择和基因流Timema cristinae手杖昆虫。女性交配歧视男性从其他人口的幅度是最大的，当适应交替寄主植物的人口之间的迁移率足够高，以允许进化的强化，但足够低，以防止基因流侵蚀适应性分歧的配偶选择。此外，生殖隔离是最强的强化和适应交替寄主植物的综合作用下。我们的研究结果表明，强化，生态适应和基因流的共同作用，在野外物种形成的进展。
Recent years have seen a resurgence of interest in the process of speciation but few studies have elucidated the mechanisms either driving or constraining the evolution of reproductive isolation. In theory, the direct effects of reinforcing selection for increased mating discrimination where interbreeding produces hybrid offspring with low fitness and the indirect effects of adaptation to different environments can both promote speciation. Conversely, high levels of homogenizing gene flow can counteract the forces of selection. We demonstrate the opposing effects of reinforcing selection and gene flow in Timema cristinae walking-stick insects. The magnitude of female mating discrimination against males from other populations is greatest when migration rates between populations adapted to alternate host plants are high enough to allow the evolution of reinforcement, but low enough to prevent gene flow from eroding adaptive divergence in mate choice. Moreover, reproductive isolation is strongest under the combined effects of reinforcement and adaptation to alternate host plants. Our findings demonstrate the joint effects of reinforcement, ecological adaptation and gene flow on progress towards speciation in the wild.