Population differences in the effect of context on personality in an invasive lizard
Population differences in the effect of context on personality in an invasive lizard
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DOI：
10.1093/beheco/arab102
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发表时间：
2021-09-17
影响因子：
2.4
通讯作者：
Chapple, David G.
中科院分区：
文献类型：
--
作者：
Brand, Jack A.;Naimo, Annalise C.;Chapple, David G.
在种群中，个体的平均行为水平（即动物个性）以及对环境变化的反应（即行为可塑性）往往始终不同。因此，环境条件的变化可能会调节动物人格特征的结构。然而，目前还不清楚人格特征是如何随着环境条件而变化的，以及这种影响是否在同一物种的多个种群中是一致的。因此，我们研究了两种生态环境下侵入性精致石龙子（lamproolis delicata）人格特征的变化。具体来说，来自三个不同种群的蜥蜴在不同食物供应水平下的群体行为分析中反复测量个体活动。我们发现环境背景对蜥蜴的性格结构有明显的影响，在没有食物的情况下，活动率是不可重复的，但在有食物资源的情况下，活动率是可重复的。在不同环境下，活动率的可重复性差异似乎主要是由于在食物资源存在的情况下进行测试时，个体差异的增加。然而，这只适用于其中一个测试人群，在另外两个人群中，食物环境对性格特征的表达没有影响。我们的研究结果强调了环境背景在调节动物人格特征结构中的重要作用，并表明这种影响可能因种群而异。
Within populations, individuals often differ consistently in their average level of behavior (i.e., animal personality), as well as their response to environmental change (i.e., behavioral plasticity). Thus, changes in environmental conditions might be expected to mediate the structure of animal personality traits. However, it is currently not well understood how personality traits change in response to environmental conditions, and whether this effect is consistent across multiple populations within the same species. Accordingly, we investigated variation in personality traits across two ecological contexts in the invasive delicate skink (Lampropholis delicata). Specifically, lizards from three different populations were repeatedly measured for individual activity in group behavioral assays under differing levels of food availability. We found that environmental context had a clear effect on the structure of lizard personality, where activity rates were not repeatable in the absence of food, but were repeatable in the presence of food resources. The difference in repeatability of activity rates across contexts appeared to be largely driven by an increase in among-individual variance when tested in the presence of food resources. However, this was only true for one of the populations tested, with food context having no effect on the expression of personality traits in the other two populations. Our results highlight the important role of environmental context in mediating the structure of animal personality traits and suggest that this effect may vary among populations.