EVOLUTION OF MALE AND FEMALE GENITALIA FOLLOWING RELEASE FROM SEXUAL SELECTION
EVOLUTION OF MALE AND FEMALE GENITALIA FOLLOWING RELEASE FROM SEXUAL SELECTION
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DOI：
10.1111/j.1558-5646.2011.01309.x
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发表时间：
2011-08-01
期刊：
影响因子：
3.3
通讯作者：
Bonduriansky, Russell
中科院分区：
文献类型：
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作者：
Cayetano, Luis;Maklakov, Alexei A.;Bonduriansky, Russell
尽管生殖器在性互动和受精中发挥着关键作用，但性选择和冲突在塑造生殖器特征中的作用仍然知之甚少。种子甲虫（Callosobruchus maculatus）雄性在插入器官上有刺，雌性具有加厚的生殖道壁，也有刺。我们调查了性选择和冲突的作用，实行一夫一妻制交配的8个复制种群的这种自然一夫多妻制的昆虫，同时保持其他8个种群下的一夫多妻制。为了确定交配系统操作的反应是否对生态环境具有鲁棒性，我们同时操作了生活史选择（早期/晚期繁殖）。经过18-21代，雄性生殖器棘在大型雄性中进化出相对较短的长度（即，浅静态异速生长）。两个nonintromittent男性生殖器附属物也进化的交配系统和生态的相互作用。相比之下，在女性生殖器中没有发生可检测到的进化，这与防御特征延迟反应的预期一致。我们的研究结果支持男性生殖器棘的性拮抗作用，并证明了静态异速生长的演变，在性选择的机会变化。我们认为，进一步的进展，在研究生殖器的共同进化将需要一个更详细的了解男性和女性生殖器特征的功能。
Despite the key functions of the genitalia in sexual interactions and fertilization, the role of sexual selection and conflict in shaping genital traits remains poorly understood. Seed beetle (Callosobruchus maculatus) males possess spines on the intromittent organ, and females possess a thickened reproductive tract wall that also bears spines. We investigated the role of sexual selection and conflict by imposing monogamous mating on eight replicate populations of this naturally polygamous insect, while maintaining eight other populations under polygamy. To establish whether responses to mating system manipulation were robust to ecological context, we simultaneously manipulated life-history selection (early/late reproduction). Over 18-21 generations, male genital spines evolved relatively reduced length in large males (i.e., shallower static allometry) in monogamous populations. Two nonintromittent male genital appendages also evolved in response to the interaction of mating system and ecology. In contrast, no detectable evolution occurred in female genitalia, consistent with the expectation of a delayed response in defensive traits. Our results support a sexually antagonistic role for the male genital spines, and demonstrate the evolution of static allometry in response to variation in sexual selection opportunity. We argue that further advances in the study of genital coevolution will require a much more detailed understanding of the functions of male and female genital traits.