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首页> 外文期刊>Evolution: International Journal of Organic Evolution >Inbreeding depression increases with environmental stress: An experimental study and meta-analysis
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Inbreeding depression increases with environmental stress: An experimental study and meta-analysis

机译：近亲衰退随着环境压力的增加而增加：一项实验研究和荟萃分析

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Inbreeding-environment interactions occur when inbreeding leads to differential fitness loss in different environments. Inbred individuals are often more sensitive to environmental stress than are outbred individuals, presumably because stress increases the expression of deleterious recessive alleles or cellular safeguards against stress are pushed beyond the organism's physiological limits. We examined inbreeding-environment interactions, along two environmental axes (temperature and rearing host) that differ in the amount of developmental stress they impose, in the seed-feeding beetle Callosobruchus maculatus. We found that inbreeding depression (inbreeding load, L) increased with the stressfulness of the environment, with the magnitude of stress explaining as much as 66% of the variation in inbreeding depression. This relationship between L and developmental stress was not explainable by an increase in phenotypic variation in more stressful environments. To examine the generality of this experimental result, we conducted a meta-analysis of the available data from published studies looking at stress and inbreeding depression. The meta-analysis confirmed that the effect of the environment on inbreeding depression scales linearly with the magnitude of stress; a population suffers one additional lethal equivalent, on average, for each 30% reduction in fitness induced by the stressful environment. Studies using less-stressful environments may lack statistical power to detect the small changes in inbreeding depression. That the magnitude of inbreeding depression scales with the magnitude of the stress applied has numerous repercussions for evolutionary and conservation genetics and may invigorate research aimed at finding the causal mechanism involved in such a relationship.
机译：当近交会导致在不同环境中差异适应度损失时，就会发生近亲环境相互作用。自交个体通常比自交个体对环境压力更敏感，大概是因为压力增加了有害隐性等位基因的表达或针对压力的细胞保护措施超出了生物的生理极限。我们研究了沿两个环境轴（温度和饲养宿主）在种子饲喂甲虫Callosobruchus maculatus中施加的发育压力的大小不同的近亲环境相互作用。我们发现近交抑郁症（近交负荷L）随着环境压力的增加而增加，应力的大小解释了近亲抑郁症变化的66％。 L和发育压力之间的这种关系无法通过在压力更大的环境中表型变异的增加来解释。为了检验该实验结果的一般性，我们对发表的研究中有关压力和近亲抑郁的可用数据进行了荟萃分析。荟萃分析证实，环境对近亲抑郁的影响与压力的大小呈线性关系。压力环境导致的健康水平每降低30％，一个人口平均就会遭受额外的致命当量。使用压力较小的环境进行的研究可能缺乏统计能力，无法检测近亲抑郁的微小变化。近亲抑郁的程度随所施加的压力的大小而定，会对进化和保护遗传学产生许多影响，并且可能会激发旨在寻找这种关系的因果机制的研究。

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