Sexual conflict over remating interval is modulated by the sex peptide pathway.
Sexual conflict over remating interval is modulated by the sex peptide pathway.
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DOI：
10.1098/rspb.2016.2394
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发表时间：
2017-03-15
期刊：
影响因子：
--
通讯作者：
Chapman T
中科院分区：
文献类型：
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作者：
Smith DT;Clarke NV;Boone JM;Fricke C;Chapman T
雄性和雌性的进化利益存在分歧的性冲突塑造了不同类群生殖系统的进化。在这里，我们利用果蝇来研究自然的三向互动中的性冲突，其中包括雌性、她现在的和以前的伴侣。我们通过使用性肽受体（SPR）无效的雌性以及通过将重新交配时间从3小时更改为48小时（在此期间经常发生自然重新交配）来操纵性冲突的可能性。缺乏SPR的雌性不会对交配过程中转移的性肽（SP）做出反应，并保持高接受性和低繁殖力的处女水平。在没有 SPR 的情况下，健身兴趣趋于一致，所有个体在 5 小时重新交配时都获得最高生产力。这表明性冲突的表达减少了。我们观察到了早期再交配中第二雄性特有的意想不到的优势，这是由于第二雄性精子使用效率的提高所致。这种被第二只雄性剥削的早期机会窗口取决于 SPR 的存在。结果表明，SP 途径可以调节该系统中性冲突的表达，并表明如何维持塑造冲突与合作的选择性力量的变化。
Sexual conflict, in which the evolutionary interests of males and females diverge, shapes the evolution of reproductive systems across diverse taxa. Here, we used the fruit fly to study sexual conflict in natural, three-way interactions comprising a female, her current and previous mates. We manipulated the potential for sexual conflict by using sex peptide receptor (SPR) null females and by varying remating from 3 to 48 h, a period during which natural rematings frequently occur. SPR-lacking females do not respond to sex peptide (SP) transferred during mating and maintain virgin levels of high receptivity and low fecundity. In the absence of SPR, there was a convergence of fitness interests, with all individuals gaining highest productivity at 5 h remating. This suggests that the expression of sexual conflict was reduced. We observed an unexpected second male-specific advantage to early remating, resulting from an increase in the efficiency of second male sperm use. This early window of opportunity for exploitation by second males depended on the presence of SPR. The results suggest that the SP pathway can modulate the expression of sexual conflict in this system, and show how variation in the selective forces that shape conflict and cooperation can be maintained.