The effects of copulation duration in the bruchid beetle Callosobruchus maculatus
The effects of copulation duration in the bruchid beetle Callosobruchus maculatus
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DOI：
10.1093/beheco/arj045
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发表时间：
2006-05-01
影响因子：
2.4
通讯作者：
Canal, D
中科院分区：
文献类型：
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作者：
Edvardsson, M;Canal, D
控制交配持续时间是一个潜在的重要发电机的性冲突，很少得到经验的关注。斑豆象的交配行为可能反映了交配持续时间的性冲突。雄性的内插器官上有刺，刺入雌性的生殖道，雌性在交配时踢它们的配偶。如果雌性被阻止踢，交配持续时间更长，雌性遭受的伤害更严重。据推测，雄性用刺作为锚来延长交配时间，雌性用踢来终止交配。我们通过实验操纵交配持续时间，并量化其对雄性和雌性适应性成分的影响，以检验在雄性和雌性中是否存在交配持续时间的冲突。斑点的女性没有遭受长期交配，而是经历了一生的繁殖力增加。射精量随着交配时间的延长而增加，雌性显然从射精中获得了物质上的好处。第一次交配和长时间交配的雄性在与其他雄性的精子竞争时相对不成功。然而，有一种趋势，女性remating倾向，减少长交配持续时间，第一个男性，因此也可能受益于长交配。交配持续时间的第二个男性交配精子优先没有显着的影响。我们的结论是，尽管雄性刺似乎已经进化成在交配过程中充当锚的角色，但在C.斑点的
Control over copulation duration is a potentially important generator of sexual conflict that has received little empirical attention. The copulatory behavior of the bruchid beetle Callosobruchus maculatus may reflect a sexual conflict over copulation duration. Males have spines on their intromittent organs that puncture the female reproductive tract, and females kick their mates during copulation. If females are prevented from kicking, copulations last longer and the injuries females sustain are more severe. Males supposedly use the spines as anchors to prolong copulation duration, and females kick to terminate copulations. We manipulated copulation duration experimentally and quantified its effects on male and female fitness components to test whether or not there is a conflict over copulation duration in C. maculatus. Females did not suffer from long copulations but instead experienced increased lifetime fecundity. Ejaculate size increased with copulation duration, and females apparently derive material benefits from the ejaculates. Males that mated first and had long copulations were relatively unsuccessful when competing with sperm from other males. However, there was a trend for female remating propensity to decrease with long copulation durations, and first males may therefore also benefit from long copulations. The copulation duration of the second male to mate did not have a significant effect on sperm precedence. We conclude that even though it seems likely that the male spines have evolved to act as an anchor during copulation, there seems to be little conflict over copulation duration per se in C. maculatus.