No evidence that presence of sexually transmitted infection selects for reduced mating rate in the two spot ladybird, Adalia bipunctata.
No evidence that presence of sexually transmitted infection selects for reduced mating rate in the two spot ladybird, Adalia bipunctata.
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作者：
Jones SL;Pastok D;Hurst GD
性传播感染在动物和植物中很常见，并且经常损害个体的生育能力。理论预测，自然选择将有利于减少获得性传播感染机会的行为。我们调查了是否STI，Coccipolipus bipunctata选择增加拒绝交配的女性Adalia bipunctata的一种机制，以避免暴露。我们首先证明，拒绝交配的女性确实减少了获得螨的机会。然后，我们检查了在共同环境中测试时，有螨种群和无螨种群的瓢虫之间的排斥率和交配率是否存在差异。两个群体之间没有观察到排斥强度或再交配倾向的差异。因此，我们得出结论，没有证据表明性传播感染驱动了该物种雌性交配行为的进化。
Sexually transmitted infections (STIs) are common in animals and plants, and frequently impair individual fertility. Theory predicts that natural selection will favour behaviours that reduce the chance of acquiring a STI. We investigated whether an STI, Coccipolipus hippodamiae has selected for increased rejection of mating by female Adalia bipunctata as a mechanism to avoid exposure. We first demonstrated that rejection of mating by females did indeed reduce the chance of acquiring the mite. We then examined whether rejection rate and mating rate differed between ladybirds from mite-present and mite-absent populations when tested in a common environment. No differences in rejection intensity or remating propensity were observed between the two populations. We therefore conclude there is no evidence that STIs have driven the evolution of female mating behaviour in this species.