A Maladaptive Combination of Traits Contributes to the Maintenance of a Drosophila Hybrid Zone.
A Maladaptive Combination of Traits Contributes to the Maintenance of a Drosophila Hybrid Zone.
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DOI：
10.1016/j.cub.2018.07.005
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发表时间：
2018-09-24
期刊：
影响因子：
--
通讯作者：
Matute DR
中科院分区：
文献类型：
--
作者：
Cooper BS;Sedghifar A;Nash WT;Comeault AA;Matute DR
teissieri果蝇和D. yakuba果蝇大约在300万年前分化，并被认为在非洲拥有一个很大的祖先范围。这些物种现在共同出现在非洲大陆的部分地区和西非的比奥科岛上。虽然D. yakuba是人类的共生体，但D. teissieri似乎与Parinari水果有关，将其范围限制在森林中。基因组数据表明基因渗入，尽管没有当代杂交的证据。在这里，我们报告D. yakuba-D的发现。比奥科岛次生林与受干扰的开放生境交界处的小叶猴杂交。我们证明了杂种是D. yakuba雌性和D. teissieri雄性的F1后代。在比奥科岛这样的高温环境下，雌性斑胸草斑蝶通常不太愿意交配；再加上温度对产卵和卵向成虫的存活率的影响，这降低了♀D。D。雅库巴相对于交叉的倒数。田间和实验室实验表明，F1杂交种具有yakuba D.行为和teissieri D.生理的不适应组合，对基因流动产生额外的障碍。然而，对基因组的渐渗和非渐渗区域的分析表明，虽然罕见，但基因流动是相对较新的。我们的观察确定了精确的内在和外在因素，以及杂交雄性不育，限制基因流动和维持这些物种。这些数据使得越来越多的文献表明几内亚湾可能是杂交的热点地区。Cooper等人在西非的Bioko记录了yakuba果蝇和D. teissieri之间的杂交。温度依赖性的生殖隔离限制了雌蚊杂交后代的产生。yakuba D.行为和D. teissieri生理在杂交种中的不适应组合对基因流动产生了额外的障碍。
Drosophila teissieri and D. yakuba diverged approximately 3 million years ago and are thought to share a large, ancestral, African range. These species now co-occur in parts of continental Africa and in west Africa on the island of Bioko. While D. yakuba is a human commensal, D. teissieri seems to be associated with Parinari fruits, restricting its range to forests. Genome data indicate introgression, despite no evidence of contemporary hybridization. Here, we report the discovery of D. yakuba-D. teissieri hybrids at the interface of secondary forests and disturbed, open habitats on Bioko. We demonstrate that hybrids are the F1 progeny of D. yakuba females and D. teissieri males. At high temperatures like those found on Bioko, D. teissieri females are generally less receptive to mating; and in combination with temperature effects on egg lay and egg-to-adult viability, this decreases the potential for gene flow between ♀D. teissieri and ♂D. yakuba relative to the reciprocal cross. Field and laboratory experiments demonstrate that F1 hybrids have a maladaptive combination of D. yakuba behavior and D. teissieri physiology, generating additional barriers to gene flow. Nevertheless, analysis of introgressed and non-introgressed regions of the genome indicate that, while rare, gene flow is relatively recent. Our observations identify precise intrinsic and extrinsic factors that, along with hybrid male sterility, limit gene flow and maintain these species. These data contribute to a growing body of literature that suggests the Gulf of Guinea may be a hotspot for hybridization. Cooper et al. document hybridization between Drosophila yakuba and D. teissieri on Bioko in west Africa. Temperature-dependent reproductive isolation limits the production of hybrids produced by D. teissieri females. A maladaptive combination of D. yakuba behavior and D. teissieri physiology in hybrids generates additional barriers to gene flow.
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影响因子：
64.8
作者：
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通讯作者：
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作者：
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