No evidence for divergence in male harmfulness or female resistance in response to changes in the opportunity for dispersal

The outcome of sexual conflict can depend on the social environment, as males respond to changes in the inclusive fitness payoffs of harmfulness and harm females less when they compete with familiar relatives. Theoretical models also predict that if limited male dispersal predictably enhances local relatedness while maintaining global competition, kin selection can produce evolutionary divergences in male harmfulness among populations. Experimental tests of these predictions, however, are rare. We assessed rates of dispersal in female and male seed beetles Callosobruchus maculatus, a model species for studies of sexual conflict, in an experimental setting. Females dispersed significantly more often than males, but dispersing males travelled just as far as dispersing females. Next, we used experimental evolution to test whether limiting dispersal allowed the action of kin selection to affect divergence in male harmfulness and female resistance. Populations of C. maculatus were evolved fo...

性冲突（sexual conflict）的演化结局往往依赖于社会环境：当雄性与熟悉的亲属竞争时，它们会根据伤害行为的广义适合度（inclusive fitness）收益变化调整策略，对雌性的伤害程度会相应降低。此外，理论模型预测：若雄性扩散受限可稳定提升局部亲缘关系水平，同时维持全局竞争，则亲缘选择可导致不同种群间雄性伤害行为的演化分化。然而，针对这些理论预测的实验验证仍较为匮乏。我们以性冲突研究的模式物种——绿豆象（Callosobruchus maculatus）为实验对象，在受控实验环境中评估了雌雄个体的扩散速率。实验结果显示，雌性的扩散频率显著高于雄性，但扩散的雄性个体所移动的距离与雌性并无显著差异。随后，我们通过实验演化方法，验证当扩散受限时，亲缘选择是否可驱动种群间雄性伤害行为与雌性抗性的演化分化。本研究中的绿豆象（C. maculatus）种群被演化培育以……