Mate choice and courtship signal differentiation promotes speciation in an Amazonian frog
Mate choice and courtship signal differentiation promotes speciation in an Amazonian frog
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DOI：
10.1093/beheco/arn098
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发表时间：
2008-11-01
影响因子：
2.4
通讯作者：
Ron, Santiago R.
中科院分区：
文献类型：
--
作者：
Guerra, Monica A.;Ron, Santiago R.
雌性配偶选择影响雄性求偶信号的进化，当这些性选择特征在物种歧视中也起作用时，可能会促进物种形成。在这里，我们通过对厄瓜多尔Puyo的亚马逊蛙Engystomops petersi种群进行趋声性实验来评估种群间雌性配偶选择。我们的研究结果显示，每2个外国人中就有1个行为孤立。普约族女性强烈歧视La Selva，而倾向于普约族或亚苏尼族的信号。相比之下，Puyo雌性不会歧视来自Yasuni的信号，它们的频率相似。行为隔离比预期的更强烈，因为Puyo雌性无法识别La Selva属于同种雄性的求爱信号。总体而言，雌性配偶的选择与种群中雄性求爱信号的分化一致，但与地理或遗传距离不一致。在无方向进化（布朗运动）零模型下的模拟表明，La Selva的求爱信号有方向选择。基于我们的研究结果，我们假设性选择和/或强化正在推动petersi种群之间的物种形成。
Female mate choice influences the evolution of male courtship signals and may promote speciation when those sexually selected traits also have a function in species discrimination. Here, we assess interpopulation female mate choice by conducting phonotaxis experiments on a population of the Amazonian frog Engystomops petersi in Puyo, Ecuador. Our results show very strong behavioral isolation relative to 1 of 2 foreign populations. Puyo females strongly discriminate against La Selva in favor of Puyo or Yasuni signals. In contrast, Puyo females do not discriminate against signals from Yasuni, which are similar in frequency. Behavioral isolation was stronger than expected because Puyo females were unable to recognize La Selva courtship signals as belonging to conspecific males. Overall, female mate choices are consistent with male courtship signal differentiation among populations but inconsistent with geographic or genetic distances. Simulations under a null model of undirected evolution (Brownian motion) suggest directional selection on courtship signals at La Selva. Based on our results, we hypothesize that sexual selection and/or reinforcement is driving speciation between E. petersi populations.