Variation in plasticity of personality traits implies that the ranking of personality measures changes between environmental contexts: calculating the cross-environmental correlation
Variation in plasticity of personality traits implies that the ranking of personality measures changes between environmental contexts: calculating the cross-environmental correlation
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DOI：
10.1007/s00265-013-1603-9
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发表时间：
2013-10-01
影响因子：
2.3
通讯作者：
Brommer, Jon E.
中科院分区：
文献类型：
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作者：
Brommer, Jon E.
越来越多的研究使用随机回归分析（RR）来探索个体之间在如何根据不同的环境背景调整行为方面是否存在差异。RR估计个体间的海拔方差（平均环境中的预期行为）和可塑性方差（个体特定的行为对环境的调整）以及这些属性之间的协方差。这些（协）方差允许导出环境特异性重复性估计和环境条件之间行为的个体水平相关性，这两者对于理解空间和时间上行为的一致性（动物个性研究的核心问题）都具有重要意义。然而，很少有研究使用RR估计值来提供这一信息。在本文中，我概述了如何提取这些信息（包括R中的示例代码），并将该方法应用于基于9项已发表的RR研究的16项估计。尽管这些行为在不同的环境条件下具有良好的可重复性，但我发现在一半的情况下，跨环境相关性很低（< 0.4）。这意味着，个人在他们的行为特征值不同，但这些个人价值观的排名往往会改变环境条件之间。动物人格特质的这种不一致性似乎没有得到充分的重视，未来使用RR进行的可塑性研究应该明确包括这一点。
Studies increasingly explore whether there is variation between individuals in how they adjust their behavior to different environmental contexts using random regression analysis (RR). RR estimates the between-individual variance in elevation (expected behavior in the mean environment) and variance in plasticity (individual-specific adjustment of behavior to the environment) and the covariance between these properties. These (co)variances allow deriving both environment-specific repeatability estimates and the individual-level correlation in behavior between environmental conditions, both of which are of key interest for understanding consistency in behavior over space and time, a core issue in animal personality research. However, very few studies use the RR estimates to produce this information. In this paper, I outline how to extract this information (including example code in R) and apply the approach to 16 estimates based on nine published RR studies. Despite the fact that the behaviors have a decent repeatability under different environmental conditions, I find that in half the cases, the cross-environmental correlation is low (< 0.4). This implies that individuals differ in their behavioral trait values but that the ranking of these individual values tends to change between environmental conditions. This level of inconsistency in animal personality traits appears not to have been fully appreciated, and future studies on plasticity using RR should explicitly include it.