Sexual conflict and cooperation under naturally occurring male enforced monogamy
Sexual conflict and cooperation under naturally occurring male enforced monogamy
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DOI：
10.1046/j.1420-9101.2003.00654.x
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发表时间：
2003-12
影响因子：
2.1
通讯作者：
V. T. Montrose;W. E. Harris;Patricia J. Moore
中科院分区：
文献类型：
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作者：
V. T. Montrose;W. E. Harris;Patricia J. Moore
在雌性交配模式方面，两性之间经常存在进化上的冲突。雌性可以从一夫多妻制中受益，而与一夫多妻制雌性交配的雄性会因为精子竞争而失去生育机会。在这种冲突发生的地方，雄性控制雌性驯养的机制预计会进化，通常是以雌性的健康为代价的。在少数地位较高的雄性垄断交配机会从而精子供应有限的系统中，雌性的健康成本将会增加。在这里，我们展示了在蟑螂Nauphy eta cinerea中，在第一个生殖周期中，雄性强制雌性一夫一妻制，已经变得精疲力竭的雄性仍然能够操纵雌性的生殖行为。尽管这种操作严重降低了与精子枯竭的雄性交配的雌性的繁殖力，但雄性受益，通过防止其他雄性繁殖来增加它们的相对健康。我们的结果表明，在维持操纵机制方面存在选择，而不是维持精子数量。这项研究与之前对灰飞虱的性冲突的研究相结合，表明性冲突的原因和后果是复杂的，可能会在个体的生活史中发生变化。
An evolutionary conflict often exists between the sexes in regard to female mating patterns. Females can benefit from polyandry, whereas males mating with polyandrous females lose reproductive opportunities because of sperm competition. Where this conflict occurs, the evolution of mechanisms whereby males can control female remating, often at a fitness cost to the female, are expected to evolve. The fitness cost to the female will be increased in systems where a few high status males monopolise mating opportunities and thus have limited sperm supplies. Here we show that in the cockroach Nauphoeta cinerea, a species where males enforce female monogamy in the first reproductive cycle, males that have become sperm depleted continue to be able to manipulate female remating behaviour. Although the manipulation severely decreases fecundity in females mated to sperm‐depleted males, males benefit, increasing their relative fitness by preventing other males from reproducing. Our results suggest that there is selection on maintaining the mechanism of manipulation rather than maintaining sperm numbers. Taken with previous research on sexual conflict in N. cinerea, this study suggests that the causes and consequences of sexual conflict are complex and can change across the life history of an individual.