SEXUAL SELECTION CAN INCREASE THE EFFECT OF RANDOM GENETIC DRIFT-A QUANTITATIVE GENETIC MODEL OF POLYMORPHISM IN OOPHAGA PUMILIO, THE STRAWBERRY POISON-DART FROG
SEXUAL SELECTION CAN INCREASE THE EFFECT OF RANDOM GENETIC DRIFT-A QUANTITATIVE GENETIC MODEL OF POLYMORPHISM IN OOPHAGA PUMILIO, THE STRAWBERRY POISON-DART FROG
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DOI：
10.1111/j.1558-5646.2009.00923.x
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发表时间：
2010-06-01
期刊：
影响因子：
3.3
通讯作者：
Iwasa, Yoh
中科院分区：
文献类型：
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作者：
Tazzyman, Samuel J.;Iwasa, Yoh
巴拿马Bocas del Toro群岛毒镖蛙种群间颜色模式的差异被认为是性别选择的结果，因为在同一栖息地和范围内发现的另外两种非性别选择的树突蛙物种没有这种差异。从理论上讲，我们使用了一种结合了染色体显色和随机漂移的数量遗传性别选择模型来检验这一断言。我们发现，性选择可以通过一种我们称之为“耦合漂移”的新过程来引起观察到的变异。在我们的模型中，对于某些参数值，性选择迫使青蛙的颜色密切跟随雌性偏好的演变。任何由于遗传漂移而导致的种群间偏好差异都会传递给颜色。如果浮游植物的雌性偏好受到漂移的强烈影响，而非性别选择的树突幼虫的颜色不受影响，则耦合漂移将导致种群间表型变异的增加。然而，对于不同的参数值，耦合漂移将导致种群之间的颜色变化与其中性值相比被抑制，或者影响很小或没有影响。我们认为，耦合漂移是一种新的理论过程，它可以将性别选择与物种形成联系起来，可能更广泛地联系在一起。
The variation in color pattern between populations of the poison-dart frog Oophaga pumilio across the Bocas del Toro archipelago in Panama is suggested to be due to sexual selection, as two other nonsexually selecting Dendrobatid species found in the same habitat and range do not exhibit this variation. We theoretically test this assertion using a quantitative genetic sexual selection model incorporating aposematic coloration and random drift. We find that sexual selection could cause the observed variation via a novel process we call "coupled drift." Within our model, for certain parameter values, sexual selection forces frog color to closely follow the evolution of female preference. Any between-population variation in preference due to genetic drift is passed on to color. If female preference in O. pumilio is strongly affected by drift, whereas color in the nonsexually selecting Dendrobatid species is not, coupled drift will cause increased between-population phenotypic variation. However, with different parameter values, coupled drift will result in between-population variation in color being suppressed compared to its neutral value, or in little or no effect. We suggest that coupled drift is a novel theoretical process that could have a role linking sexual selection with speciation both in O. pumilio, and perhaps more generally.