Does reproductive isolation evolve faster in larger populations via sexually antagonistic coevolution?
Does reproductive isolation evolve faster in larger populations via sexually antagonistic coevolution?
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DOI：
10.1098/rsbl.2009.0072
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发表时间：
2009-10-23
期刊：
影响因子：
3.3
通讯作者：
Tregenza, T.
中科院分区：
文献类型：
--
作者：
Gay, L.;Eady, P. E.;Tregenza, T.
生殖投资的性冲突可能导致性对抗的共同进化和生殖隔离。有人认为，与大多数异域物种形成模型不同，通过性对抗共同进化的生殖隔离进化在大种群中发生得更快，因为这些种群拥有更高水平的遗传变异，接受更多数量的突变，并经历更强烈的性选择。我们在豆象甲虫种群（Callosobruchus maculatus）中测试了这一点，方法是操纵来自已摆脱性冲突90代的创始人的复制系的种群规模和常设遗传变异性。我们发现，经过19代重新引入的性冲突，我们的治疗已经演变成显着的整体生殖隔离复制线之间。然而，正如预测的那样，生殖隔离的措施往往是更大的人口。我们讨论了我们的方法，认为生殖隔离是最好的检查进行矩阵的异域和同域杂交，而分歧的测量需要与测试线的交叉。
Sexual conflict over reproductive investment can lead to sexually antagonistic coevolution and reproductive isolation. It has been suggested that, unlike most models of allopatric speciation, the evolution of reproductive isolation through sexually antagonistic coevolution will occur faster in large populations as these harbour greater levels of standing genetic variation, receive larger numbers of mutations and experience more intense sexual selection. We tested this in bruchid beetle populations (Callosobruchus maculatus) by manipulating population size and standing genetic variability in replicated lines derived from founders that had been released from sexual conflict for 90 generations. We found that after 19 generations of reintroduced sexual conflict, none of our treatments had evolved significant overall reproductive isolation among replicate lines. However, as predicted, measures of reproductive isolation tended to be greater among larger populations. We discuss our methodology, arguing that reproductive isolation is best examined by performing a matrix of allopatric and sympatric crosses whereas measurement of divergence requires crosses with a tester line.