Sexual selection against natural hybrids may contribute to reinforcement in a house mouse hybrid zone
Sexual selection against natural hybrids may contribute to reinforcement in a house mouse hybrid zone
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DOI：
10.1098/rspb.2013.2733
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发表时间：
2014-02-07
影响因子：
4.7
通讯作者：
Ganem, Guila
中科院分区：
文献类型：
--
作者：
Latour, Yasmin;Perriat-Sanguinet, Marco;Ganem, Guila
当混合识别信号受到歧视时，性选择可能会阻碍基因在接触区之间的流动。我们在小鼠肌肉和家鼠之间的单峰杂交区测试了这一假设，在那里描述了一种强化模式，并记录了较低的杂交适合度。我们让来自杂交区边缘的小鼠在来自同一亚种的异性尿液和在杂交区不同地点采样的杂交种之间进行选择。虽然家鼠没有表现出偏爱，但雄性肌肉对肌肉信号和混合信号有区别。值得注意的是，杂交种吸引力的模式在杂交区并没有不同。此外，在相同条件下测试的异位群体没有对混合信号进行歧视，这表明特征移位是为了信号感知或偏好。最后，评估信号之间相似性的习惯化-辨别测试指出，杂交信号与亲代信号不同。总体而言，我们的结果表明，在与家养动物的二次接触之后，边境地区的肌肉种群已经进化出了对杂交后代不具吸引力的看法。我们讨论了杂交种吸引力的机制，以及不对称性选择对杂交区动态和两个亚种之间的基因流动的潜在影响。
Sexual selection may hinder gene flow across contact zones when hybrid recognition signals are discriminated against. We tested this hypothesis in a unimodal hybrid zone between Mus musculus musculus and Mus musculus domesticus where a pattern of reinforcement was described and lower hybrid fitness documented. We presented mice from the border of the hybrid zone with a choice between opposite sex urine from the same subspecies versus hybrids sampled in different locations across the zone. While no preference was evidenced in domesticus mice, musculus males discriminated in favour of musculus signals and against hybrid signals. Remarkably, the pattern of hybrid unattractiveness did not vary across the hybrid zone. Moreover, allopatric populations tested in the same conditions did not discriminate against hybrid signals, indicating character displacement for signal perception or preference. Finally, habituation-discrimination tests assessing similarities between signals pointed out that hybrid signals differed from the parental ones. Overall, our results suggest that perception of hybrids as unattractive has evolved in border populations of musculus after the secondary contact with domesticus. We discuss the mechanisms involved in hybrid unattractiveness, and the potential impact of asymmetric sexual selection on the hybrid zone dynamics and gene flow between the two subspecies.