PATTERNS OF VARIATION IN TAIL ORNAMENT SIZE IN BIRDS
PATTERNS OF VARIATION IN TAIL ORNAMENT SIZE IN BIRDS
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DOI：
10.1111/j.1095-8312.1988.tb01969.x
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发表时间：
1988-08-01
影响因子：
1.9
通讯作者：
LUNDBERG, A
中科院分区：
文献类型：
--
作者：
ALATALO, RV;HOGLUND, J;LUNDBERG, A
近年来，已经开发了几种不同类型的性别选择模型，鸟类的尾部装饰物经常被用作性别选择特征的例子，这些模型可能适用于这些模型。然而，人们对装饰大小的种群内和种群间的差异知之甚少。我们研究了四种夜蛾--叉尾飞鸟Tyrannus Savanna和亚洲极乐世界飞鸟Terpsiphone Parisi的细长尾饰。装饰物相对较长的男性与最长的眼镜蛇(‘异形性’，正异速生长)。此外，尾长在每个地理区域内也有显著差异，变异系数(平均=11%)是体型性状的三倍。女性偏好或饰品与男性的生存能力无关的模特，通常会产生中性的平衡线。因此，他们预测不同种群之间的装饰品会有非常大的差异。然而，细长尾饰并没有表现出比体型特征更高的地理变异，这表明这些饰品不存在平衡线。
In recent years several different kinds of sexual selection models have been developed, and tail ornaments in birds have frequently been used as an example of a sexually selected character where the models might apply. However, very little is known about intra- and interpopulation variation in ornament size. We have studied the elongated tail ornaments in four species of whydahs Vidua, the forktailed flycatcher Tyrannus savanna and the Asian paradise flycatcher Terpsiphone paradisi. Ornaments were relatively longer in males with the longest tarsi (''heterogony'' with positive allometry). Also, tail lengths were remarkably variable within each geographical area, the coefficient of variation (average = 11%) being three times as high as for body size characters. Models, with female preference or ornaments bearing no relation to male viability, usually generate lines of neutral equilibria. Thus, they predict extraordinary variation in ornaments between populations. However, elongated tail ornaments did not show higher geographical variation than the body size characters, suggesting that there is no line of equilibria for these ornaments.