Context-dependent intergenerational effects: The interaction between past and present environments and its effect on population dynamics
Context-dependent intergenerational effects: The interaction between past and present environments and its effect on population dynamics
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DOI：
10.1086/499380
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发表时间：
2006-02-01
影响因子：
2.9
通讯作者：
Benton, TG
中科院分区：
文献类型：
--
作者：
Plaistow, SJ;Lapsley, CT;Benton, TG
当父母的行为影响到其后代以及可能影响到后来的后代的生殖和生存时，就产生了代际效应。模型表明，代际效应对人口动态模式和生活史特征的演变都有重要影响。然而，这将取决于代际影响的性质和持续时间。在这里，我们表明，操纵父母的食物环境的土壤螨产生的代际影响，仍然可以检测到的生活史的后代三代后。代际效应在不同的环境中以及从一代到下一代是不同的。在低食物环境中，鸡蛋大小的变化改变了成熟时年龄和大小之间的权衡，对后代产生的鸡蛋大小几乎没有影响。因此，代际影响随着时间的推移而减少。相反，在高食物环境中，鸡蛋大小的变化主要影响生育力和成人生存之间的权衡，并产生越来越多的鸡蛋大小的变化。因此，代际效应的持续性和重要性在高食物环境和低食物环境之间存在差异。因此，与背景有关的代际效应可能对人口动态产生复杂但重要的影响。
Intergenerational effects arise when parents' actions influence the reproduction and survival of their offspring and possibly later descendants. Models suggest that intergenerational effects have important implications for both population dynamical patterns and the evolution of life-history traits. However, these will depend on the nature and duration of intergenerational effects. Here we show that manipulating parental food environments of soil mites produced intergenerational effects that were still detectable in the life histories of descendents three generations later. Intergenerational effects varied in different environments and from one generation to the next. In low-food environments, variation in egg size altered a tradeoff between age and size at maturity and had little effect on the size of eggs produced in subsequent generations. Consequently, intergenerational effects decreased over time. In contrast, in high-food environments, variation in egg size predominantly influenced a tradeoff between fecundity and adult survival and generated increasing variation in egg size. As a result, the persistence and significance of intergenerational effects varied between high- and low-food environments. Context-dependent intergenerational effects can therefore have complex but important effects on population dynamics.