Within-population sperm competition intensity does not predict asymmetry in conpopulation sperm precedence.

Within-population sperm competition intensity does not predict asymmetry in conpopulation sperm precedence.
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DOI:
10.1098/rstb.2020.0071
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发表时间:
2020-12-07
期刊:
Philosophical transactions of the Royal Society of London. Series B, Biological sciences
影响因子:
--
通讯作者:
Snook RR
Snook RR
中科院分区:
其他
文献类型:
--
作者:
Garlovsky MD;Yusuf LH;Ritchie MG;Snook RR

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交配后的性选择可引起两性之间的进化军备竞赛,导致生殖表型的快速共同进化。由于影响受精成功的性状在不同种群之间存在差异,基因流动的后交性早熟(PMPZ)障碍可能会进化。同种精子优先是PMPZ隔离的一种形式,被认为在物种形成过程中很早就进化了,但大多数是在物种之间进行研究的。在这里,我们展示了蒙大拿州果蝇种群之间的同群精子优先(CPSP)。使用Pool-Seq基因组数据,我们估计了分歧时间,并询问PMPZ分离是否在面临基因流的情况下进化。我们发现包含基因流的模型最好地符合数据,表明种群在分化期间经历了相当大的基因流。我们发现CPSP是不对称的,并且在非竞争性PMPZ隔离中反映了不对称,这表明这些现象具有共同的机制。然而,我们发现,不对称性与交配后的性选择在种群中的作用强度无关。我们测试了女性生殖道内重叠的外来精液和共同进化的精液是否会改变受精成功,但没有发现任何影响。我们的结果表明,分离的时间和精子的竞争性都不能预测PMPZ分离的强度。我们认为,相反,隐晦的雌性选择或突变顺序分歧可能会导致交配后表型的分歧,从而导致PMPZ隔离。本文是主题期刊《精子竞赛五十年》的一部分。
Postcopulatory sexual selection can generate evolutionary arms races between the sexes resulting in the rapid coevolution of reproductive phenotypes. As traits affecting fertilization success diverge between populations, postmating prezygotic (PMPZ) barriers to gene flow may evolve. Conspecific sperm precedence is a form of PMPZ isolation thought to evolve early during speciation yet has mostly been studied between species. Here, we show conpopulation sperm precedence (CpSP) between Drosophila montana populations. Using Pool-seq genomic data we estimate divergence times and ask whether PMPZ isolation evolved in the face of gene flow. We find models incorporating gene flow fit the data best indicating populations experienced considerable gene flow during divergence. We find CpSP is asymmetric and mirrors asymmetry in non-competitive PMPZ isolation, suggesting these phenomena have a shared mechanism. However, we show asymmetry is unrelated to the strength of postcopulatory sexual selection acting within populations. We tested whether overlapping foreign and coevolved ejaculates within the female reproductive tract altered fertilization success but found no effect. Our results show that neither time since divergence nor sperm competitiveness predicts the strength of PMPZ isolation. We suggest that instead cryptic female choice or mutation-order divergence may drive divergence of postcopulatory phenotypes resulting in PMPZ isolation. This article is part of the theme issue ‘Fifty years of sperm competition’.
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