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首页> 外文期刊>Philosophical Transactions of the Royal Society of London, Series B. Biological Sciences >Female mating preference functions predict sexual selection against hybrids between sibling species of cichlid fish
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Female mating preference functions predict sexual selection against hybrids between sibling species of cichlid fish

机译：女性交配偏好功能预测针对丽鱼科鱼类同胞之间杂种的性选择

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摘要

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.
机译：种间杂交的进化结果，即物种崩溃成杂种群，持久性甚至增强而发散，取决于基因流与针对杂种的选择之间的平衡。如果雌性交配偏好是开放式的，但物种之间的符号相反，则从理论上讲，它们可以成为这种选择的来源。尽管有广泛杂交的证据，非洲湖泊中的丽鱼科鱼类仍保持着较高的物种形成率，并且有人提出，通过雌性选择进行有性选择对于物种边界的起源和维持很重要。但是，从未测试过杂交物种是否具有开放式偏好规则。在这里，我们报告了在三通选择实验中使用Pundamilia pundamilia，Pundamilia nyererei及其杂种的首次实验测试。杂种雄性在表型上是中间的。两种物种的野生捕捞雌性都比同种异性雄性更倾向于同种异性。他们对F1杂种雄性的反应是中等的，但与一种物种对同种异型的反应更相似，而对另一种物种对异种特异的反应则更相似。我们建议，尽管有杂交，但它们的择偶机制可能使单倍氨酸丽鱼科鱼容易维持并可能发生表型多样化，而且女性偏好功能中的物种差异可能预测杂交物种之间的适应性状转移的潜力。

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