Correlated evolution of male and female reproductive traits drive a cascading effect of reinforcement in Drosophila yakuba
Correlated evolution of male and female reproductive traits drive a cascading effect of reinforcement in Drosophila yakuba
复制标题
DOI：
10.1098/rspb.2016.0730
复制
发表时间：
2016-07-27
影响因子：
4.7
通讯作者：
Matute, Daniel R.
中科院分区：
文献类型：
--
作者：
Comeault, Aaron A.;Venkat, Aarti;Matute, Daniel R.
针对不适应杂交的选择可以在一种称为强化的过程中推动生殖隔离的进化。虽然强化在进化中的重要性在历史上一直存在争议，但现在有很多例子。尽管有这些例子，我们通常缺乏对限制增强表型在整个物种范围内传播的机制的详细了解。在这里，我们在果蝇果蝇Yakuba中解决了这个问题，果蝇Yakuba是一种与其姊妹种D santomea杂交的物种，正在圣多美岛一个明确界定的杂交区进行加固。在该区域内，与异地种群中的雌性相比，雌性雅库巴对D.santomea的交配前合子(配子)隔离增加。我们使用自然收集、生育分析和实验进化相结合的方法来理解为什么加强的雅库巴人的配子隔离仅限于这个杂交区域。我们发现，在其他特征中，同域种群的雅库巴雄性与异地交配的雅库巴雄性交配的后代比异地交配的雄性少。我们的结果提供了一个新的例子，强化作用于雄性的交配-早合性状，导致同种种群之间的级联生殖隔离。
Selection against maladaptive hybridization can drive the evolution of reproductive isolation in a process called reinforcement. While the importance of reinforcement in evolution has been historically debated, many examples now exist. Despite these examples, we typically lack a detailed understanding of the mechanisms limiting the spread of reinforced phenotypes throughout a species' range. Here we address this issue in the fruit fly Drosophila yakuba, a species that hybricli7es with its sister species D. santomea and is undergoing reinforcement in a well-defined hybrid zone on the island of Sao Tome. Within this region, female D. yakuba show increased postmating-prezygotic (gametic) isolation towards D. santomea when compared with females from allopatric populations. We use a combination of natural collections, fertility assays, and experimental evolution to understand why reinforced gametic isolation in D. yakuba is confined to this hybrid zone. We show that, among other traits, D. yakuba males from sympatric populations sire fewer progeny than allopatric males when mated to allopatric D. yakuba females. Our results provide a novel example of reinforcement acting on a postmating-prezygotic trait in males, resulting in a cascade of reproductive isolation among conspecific populations.