Conspecific sperm precedence is reinforced, but postcopulatory sexual selection weakened, in sympatric populations of Drosophila
Conspecific sperm precedence is reinforced, but postcopulatory sexual selection weakened, in sympatric populations of Drosophila
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DOI：
10.1098/rspb.2018.2535
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发表时间：
2019-03-20
影响因子：
4.7
通讯作者：
Moyle, Leonie C.
中科院分区：
文献类型：
--
作者：
Castillo, Dean M.;Moyle, Leonie C.
性选择可以通过推动生殖隔离的进化来加速物种形成，但推动物种形成的力量也可以对性选择进行相互反馈。这在“强化”的背景下可能尤其重要，选择直接增加了前合子障碍，以降低异种交配的成本。通过对两个姐妹种内部和之间精子竞争的分析，我们显示了这些物种相互作用的强化特征：与姐妹种D. persimilis共同发生的伪眼果蝇种群具有高于异种精子竞争的能力，这与交配后隔离增加的选择相一致。我们还发现，这些伪眼蛙种群的精子竞争能力降低，减少了种群内的性选择机会。我们的研究结果表明，增加与其他物种的生殖隔离的直接选择可能会损害物种内性选择的有效性，这是生殖性状响应异种相互作用的附带效应。
Sexual selection can accelerate speciation by driving the evolution of reproductive isolation, but forces driving speciation could also reciprocally feedback on sexual selection. This might be particularly important in the context of 'reinforcement', where selection acts directly to increase prezygotic barriers to reduce the cost of heterospecific matings. Using assays of sperm competition within and between two sister species, we show a signature of reinforcement where these species interact: populations of Drosophila pseudoobscura that co-occur with sister species D. persimilis have an elevated ability to outcompete heterospecific sperm, consistent with selection for increased postcopulatory isolation. We also find these D. pseudoobscura populations have decreased sperm competitive ability against conspecifics, reducing the opportunity for sexual selection within these populations. Our findings demonstrate that direct selection to increase reproductive isolation against other species can compromise the efficacy of sexual selection within species, a collateral effect of reproductive traits responding to heterospecific interactions.