Evolution of advertisement calls in African clawed frogs.
Evolution of advertisement calls in African clawed frogs.
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DOI：
10.1163/000579511x569435
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发表时间：
2011
期刊：
影响因子：
1.3
通讯作者：
Kelley DB
中科院分区：
文献类型：
--
作者：
Tobias ML;Evans BJ;Kelley DB
对于大多数青蛙来说，广告呼叫对于繁殖成功至关重要，传达物种身份，雄性质量，性状态和位置的信息。虽然在一些物种中已经研究了呼叫字符的进化分歧，但遗传漂变或自然选择和性选择的相对影响仍然不清楚。深入了解语音信号的进化轨迹可以通过研究广告呼叫如何在系统发育背景下变化来获得。如果亲缘关系更近的物种能表达更相似的歌声，那么遗传漂变的进化就得到了支持。相反，进化历史和歌曲表达之间的相关性很差，这表明进化是由自然选择或性选择塑造的。在这里，我们测量了20个已描述和两个未描述的非洲爪蛙（非洲爪蟾属和志留纪属）和四个种群的X。光滑。我们确定了三种呼叫类型-点击，爆裂和颤音-可以区分点击数，呼叫率和强度调制。第四种类型是双相的，由上述两种组成。呼叫类型的复杂性各不相同，从最简单的点击到最复杂的双相呼叫。呼叫类型的变化的最大简约分析表明，祖先的类型是中间的复杂性。每一种叫声类型都独立进化不止一次，并且通常不被密切相关的物种所共有。这些结果表明，呼叫类型是同源的，并具有低的系统发育信号。我们的结论是，呼叫类型的演变是由于遗传漂变，但在选择压力。
For most frogs, advertisement calls are essential for reproductive success, conveying information on species identity, male quality, sexual state and location. While the evolutionary divergence of call characters has been examined in a number of species, the relative impacts of genetic drift or natural and sexual selection remain unclear. Insights into the evolutionary trajectory of vocal signals can be gained by examining how advertisement calls vary in a phylogenetic context. Evolution by genetic drift would be supported if more closely related species express more similar songs. Conversely, a poor correlation between evolutionary history and song expression would suggest evolution shaped by natural or sexual selection. Here, we measure seven song characters in 20 described and two undescribed species of African clawed frogs (genera Xenopus and Silurana) and four populations of X. laevis. We identify three call types — click, burst and trill — that can be distinguished by click number, call rate and intensity modulation. A fourth type is biphasic, consisting of two of the above. Call types vary in complexity from the simplest, a click, to the most complex, a biphasic call. Maximum parsimony analysis of variation in call type suggests that the ancestral type was of intermediate complexity. Each call type evolved independently more than once and call type is typically not shared by closely related species. These results indicate that call type is homoplasious and has low phylogenetic signal. We conclude that the evolution of call type is not due to genetic drift, but is under selective pressure.