Female mating preference functions predict sexual selection against hybrids between sibling species of cichlid fish
Female mating preference functions predict sexual selection against hybrids between sibling species of cichlid fish
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雌性交配偏好函数预测丽鱼科鱼兄弟物种之间杂交的性选择
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
O. Seehausen
中科院分区：
文献类型：
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作者：
I. van der Sluijs;T. V. Van Dooren;Kees D. Hofker;J. V. van Alphen;R. Stelkens;O. Seehausen
种间杂交的进化结果，即物种崩溃成一个杂种群，持续存在，甚至分歧与加强，取决于基因流动和选择对杂种之间的平衡。如果雌性的交配偏好是开放式的，但在物种之间符号相反，理论上它们可以成为这种选择的来源。非洲湖泊中的慈鲷鱼尽管有广泛杂交的证据，但物种形成率仍然很高，而且雌性选择的性选择在物种边界的起源和维持中被认为是重要的。然而，从未测试过杂交物种是否具有开放式偏好规则。在这里，我们报告的第一个实验测试使用Pundamilia pundamilia，Pundamilia nyererei和它们的杂交种在三个方面的选择实验。杂种雄性在表型上是中间型。野生捕获的这两个物种的雌性对同种雄性比异种雄性有强烈的偏好。它们对F1杂种雄性的反应是中等的，但更类似于对一个物种同种的反应，也更类似于对另一个物种异种的反应。我们认为，他们的择偶机制可能倾向于haplochromine慈鲷保持，也许经历表型多样化，尽管杂交，和物种的差异，女性偏好功能可以预测杂交物种之间的适应性性状转移的潜力。
The evolutionary outcome of interspecific hybridization, i.e. collapse of species into a hybrid swarm, persistence or even divergence with reinforcement, depends on the balance between gene flow and selection against hybrids. If female mating preferences are open-ended but sign-inversed between species, they can theoretically be a source of such selection. Cichlid fish in African lakes have sustained high rates of speciation despite evidence for widespread hybridization, and sexual selection by female choice has been proposed as important in the origin and maintenance of species boundaries. However, it had never been tested whether hybridizing species have open-ended preference rules. Here we report the first experimental test using Pundamilia pundamilia, Pundamilia nyererei and their hybrids in three-way choice experiments. Hybrid males are phenotypically intermediate. Wild-caught females of both species have strong preferences for conspecific over heterospecific males. Their responses to F1 hybrid males are intermediate, but more similar to responses to conspecifics in one species and more similar to responses to heterospecifics in the other. We suggest that their mate choice mechanism may predispose haplochromine cichlids to maintain and perhaps undergo phenotypic diversification despite hybridization, and that species differences in female preference functions may predict the potential for adaptive trait transfer between hybridizing species.