Genetic variance for behavioural 'predictability' of stress response.
Genetic variance for behavioural 'predictability' of stress response.
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压力反应的行为“可预测性”的遗传方差。
DOI：
10.1111/jeb.13601
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发表时间：
2020
影响因子：
2.1
通讯作者：
Prentice PM
中科院分区：
文献类型：
--
作者：
Prentice PM
如果自然选择要导致适应性进化，则需要支持表型变异的遗传因素。然而，进化和行为生态学家通常关注个体平均特征值的变化，并试图表征遗传对此的贡献。因此，人们很少关注基因是否以及如何促进个体差异或性状“可预测性”。事实上，表型的“可预测性”可能因个体而异，来自牲畜遗传学的新证据表明这可能是由于遗传因素造成的。在这里，我们通过重复测量纯种野生型孔雀鱼种群的行为应激反应特征来对此进行实证测试。 我们询问（a）个体在行为可预测性方面是否存在差异，以及（b）这种变异是否可遗传并在选择下可进化。使用数量遗传学领域的统计方法，我们找到了这两种假设的支持，并显示了行为特征平均值和个体可预测性之间遗传相关结构的证据。我们表明，调查性状可预测性变异的来源在统计上是易于处理的，并且可以产生有用的生物学解释。我们的结论是，如果“可预测性”的遗传变异广泛存在，将对表型变异的进化原因和后果产生重大影响。 摘要我们检查了野生型孔雀鱼的行为应激反应（BSR）性状中个体和基因型之间表型“可预测性”的变异，并显示了性状平均值和个体可预测性之间的遗传相关结构。我们解释了性状可预测性变异来源的调查如何在统计上易于处理，并且可以产生有用的生物学解释。如果普遍存在，“可预测性”的遗传变异将对表型变异的进化原因和后果产生重大影响。
Genetic factors underpinning phenotypic variation are required if natural selection is to result in adaptive evolution. However, evolutionary and behavioural ecologists typically focus on variation among individuals in their average trait values and seek to characterize genetic contributions to this. As a result, less attention has been paid to if and how genes could contribute towards within‐individual variance or trait ‘predictability’. In fact, phenotypic ‘predictability’ can vary among individuals, and emerging evidence from livestock genetics suggests this can be due to genetic factors. Here, we test this empirically using repeated measures of a behavioural stress response trait in a pedigreed population of wild‐type guppies. We ask (a) whether individuals differ in behavioural predictability and (b) whether this variation is heritable and so evolvable under selection. Using statistical methodology from the field of quantitative genetics, we find support for both hypotheses and also show evidence of a genetic correlation structure between the behavioural trait mean and individual predictability. We show that investigating sources of variability in trait predictability is statistically tractable and can yield useful biological interpretation. We conclude that, if widespread, genetic variance for ‘predictability’ will have major implications for the evolutionary causes and consequences of phenotypic variation.AbstractWe examine variation in phenotypic “predictability” among individuals and genotypes in a behavioural stress response (BSR) trait in wild‐type guppies, and show a genetic correlation structure between the trait mean and individual predictability. We explain how investigating sources of variability in trait predictability is statistically tractable, and can yield useful biological interpretation. If widespread, genetic variance for ‘predictability’ will have major implications for the evolutionary causes and consequences of phenotypic variation.