Individual differences in developmental precision and fluctuating asymmetry: a model and its implications
Individual differences in developmental precision and fluctuating asymmetry: a model and its implications
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DOI：
10.1046/j.1420-9101.1999.00039.x
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发表时间：
1999-03-01
影响因子：
2.1
通讯作者：
Thornhill, R
中科院分区：
文献类型：
--
作者：
Gangestad, SW;Thornhill, R
在许多研究中，波动不对称性（FA）已被用来衡量个体差异的发展不精确性。发展不精确的变化是如何与不对称的变化模型描述和应用到有关FA的重要问题。如果发育不精确性存在个体差异，则由于发育错误引起的不对称性应呈尖峰分布。此外，个体差异的幅度越大，峰度越大。在许多物种中，由于发育错误而引起的不对称性实际上是呈尖峰分布的。尖峰水平表明，潜在的发展不精确性的个体差异的CV通常为20-25，这与它是一种适应性特征相一致。此外，数据表明：（1）不同性状的发育不精确性背后的个体差异在很大程度上是跨性状共享的，而不是性状特异性的;（2）这些个体差异的遗传力平均在35%和55%之间，尽管个体性状FA的遗传力很小; FA与适合度性状或组分之间的相关表明，许多物种发育精度的潜在变异与适合度之间存在高度相关。理论影响进行了讨论。
In many studies, fluctuating asymmetry (FA) has been used as a measure of individual differences in developmental imprecision. A model of how variation in developmental imprecision is associated with variation in asymmetry is described and applied to important issues about FA. If individual differences in developmental imprecision exist, asymmetry due to developmental error should be leptokurtically distributed. Moreover, the greater the magnitude of individual differences, the greater the leptokurtosis. Asymmetry purportedly due to developmental error in a variety of species is indeed leptokurtically distributed. The level of leptokurtosis suggests that the CV in individual differences in underlying developmental imprecision is generally 20-25, consistent with it being a fitness trait. In addition, data suggest that: (1) the individual differences that underlie the developmental imprecision of different traits are largely shared across traits and not trait-specific; (2) the heritability of these individual differences may average between 35 and 55%, despite small heritabilities of individual trait FAs; and (3) correlations between FA and fitness traits or components suggest high correlations between underlying variation in developmental precision and fitness in many species. Theoretical implications are discussed.