Sexual conflict over the duration of copulation in Drosophila montana: why is longer better?
Sexual conflict over the duration of copulation in Drosophila montana: why is longer better?
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DOI：
10.1186/1471-2148-9-132
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发表时间：
2009-06-12
影响因子：
3.4
通讯作者：
Klappert K
中科院分区：
文献类型：
--
作者：
Mazzi D;Kesäniemi J;Hoikkala A;Klappert K
两性之间的利益冲突越来越被认为是推动生殖特征(共同)进化的引擎。蒙大拿果蝇的生殖行为表明，在交配过程中发生了性冲突。在交配的最后阶段，雌性极力试图赶走不断增加的雄性，而雄性则努力保持生殖器接触，并经常成功地延长交配，远远超过雌性喜欢的持续时间。通过防止雌性抵抗，我们发现雌性对缩短交配有很大的贡献。我们在不同的性别比例条件下进行了交配，并提供了证据表明，交配持续时间是一种男性生殖投资形式，它响应了博弈论模型预测的精子竞争的感知强度。此外，我们调查了坚持不懈的雄性的潜在好处，以及被迫进行更长时间交配的雌性的代价。虽然雄性并没有从延长交配来增加后代产量方面受益，但雌性在漫长的第一次交配后推迟了交配。交配时间是容易发生性别冲突的特征。交配持续时间超过雌性擎天柱，为雄性提供了一种“延长配偶保护”的形式：通过在雌性体内诱导交配不稳定，雄性延长了其精子专门用于繁殖后代的时间，并降低了雌性被竞争对手重新受精的可能性。
Conflicts of interest between the sexes are increasingly recognized as an engine driving the (co-)evolution of reproductive traits. The reproductive behaviour of Drosophila montana suggests the occurrence of sexual conflict over the duration of copulation. During the last stages of copulation, females vigorously attempt to dislodge the mounting male, while males struggle to maintain genital contact and often successfully extend copulations far beyond the females' preferred duration. By preventing female resistance, we show that females make a substantial contribution towards shortening copulations. We staged matings under different sex ratio conditions, and provide evidence that copulation duration is a form of male reproductive investment that responds to the perceived intensity of sperm competition as predicted by game theoretical models. Further, we investigated potential benefits to persistent males, and costs to females coerced into longer matings. While males did not benefit in terms of increased progeny production by protracting copulation, female remating was delayed after long first copulations. Copulation time is a trait subject to sexual conflict. Mating durations exceeding female optima serve males as a form of 'extended mate guarding': by inducing mating refractoriness in the female, a male extends the time over which its sperm is exclusively used to sire progeny and reduces the likelihood of the female being reinseminated by a competitor.
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DOI：
10.1098/rspb.2000.1176
发表时间：
2000-08-07
影响因子：
4.7
作者：
Hunter, FM;Harcourt, R;Davis, LS
通讯作者：
Davis, LS
影响因子：
1
作者：
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通讯作者：
KREBS, RA
影响因子：
0.9
作者：
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影响因子：
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通讯作者：
PARSONS, PA
影响因子：
5.9
作者：
ASPI, J;LUMME, J;HEIKKINEN, E
通讯作者：
HEIKKINEN, E