A sexually selected character displacement in flycatchers reinforces premating isolation
A sexually selected character displacement in flycatchers reinforces premating isolation
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DOI：
10.1038/42451
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发表时间：
1997-06
期刊：
影响因子：
64.8
通讯作者：
Glenn-Peter Stre;T. Moum;S. Bureš;M. Král;M. Adamjan;J. Moreno
中科院分区：
文献类型：
--
作者：
Glenn-Peter Stre;T. Moum;S. Bureš;M. Král;M. Adamjan;J. Moreno
理论表明，反对生产不适合的杂交后代的自然选择可能会加强基因流动的障碍，最终导致不同种群的生殖隔离。这种物种形成模式可以通过雌性选择来实现，因为雌性选择在雄性第二性特征上的差异有助于物种识别。虽然直觉上很有吸引力，但通常缺乏这种强化的确凿证据，而且人们对其有效性提出了严重的怀疑。我们使用分子技术、野外观察和配偶选择实验，对欧洲黑白捕手鸟的强化假说的关键预测进行了检验。在两个物种共存的种群中，我们表明雌性选择选择了雄性羽毛颜色的差异，由此导致的特征置换降低了杂交的频率。
Theory suggests that natural selection against the production of unfit hybrids may reinforce barriers to gene flow, eventually leading to reproductive isolation of differentiated populations,,,. This mode of speciation may be achieved by female choice selecting for a divergence in male secondary sexual traits that facilitates species recognition. Although intuitively appealing, conclusive evidence for such reinforcement is generally lacking,,,, and serious doubts have been raised about its validity,,. We have tested key predictions of the reinforcement hypothesis on the European, black-and-white,Ficedulaflycatchers, using molecular techniques, field observations and mate choice experiments. In populations where two species coexist, we show that female choice selects for a divergence in male plumage colour and that the resulting character displacement reduces the frequency of hybridization.