Maternal diet and age alter direct and indirect relationships between life-history traits across multiple generations
Maternal diet and age alter direct and indirect relationships between life-history traits across multiple generations
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母亲的饮食和年龄改变了多代人的生活史特征之间的直接和间接关系
DOI：
10.1111/1365-2435.13258
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发表时间：
2018
影响因子：
5.2
通讯作者：
Fox, ed., Charles
中科院分区：
文献类型：
--
作者：
Goos, Jared M.;Swain, Cameron J.;Munch, Stephan B.;Walsh, Matthew R.;Fox, ed., Charles
母亲年龄对后代的健康有重要影响，影响体型、发育和生殖时间表。这种孕产妇年龄效应可能是由于资源配置的差异造成的；然而，人们对营养资源的环境供应在调节这种影响中的作用知之甚少。我们通过研究母亲营养和年龄对淡水甲壳动物Daphnia pulicaria的女儿和孙女生活史特征的潜在交互影响，测试了限制营养资源、膳食磷（P）对多代母亲年龄的影响。母亲年龄和饮食对后代生活史有显着但相反的影响。我们没有观察到任何证据表明年龄对后代生活史的影响是由母亲饮食介导的。然而，孙女成熟时的生长和体型受到祖母年龄和饮食之间相互作用的影响，这表明年龄和饮食的跨代效应的出现延迟了一代。由于后代的生活史通常与前几代的生活史变异直接和/或间接相关，因此我们利用结构方程模型（SEM）来评估这种直接或间接的关系。SEM揭示了代内和代际之间生长、发育时间和繁殖力之间关系的显着差异，具体取决于后代的年龄和饮食。 F0一代。有趣的是，当祖母年老且喂养低磷饮食时，F0代和F2代之间直接且持久的关系最为普遍，而这种关系很大程度上是由F0代的繁殖力驱动的。此外，当祖母年轻且喂养低磷饮食或当祖母年老且喂养高磷饮食时，F0代和F2代之间的间接因果关系最为明显。我们的结果表明，母亲年龄和环境的跨代影响持续存在于多个世代中，并且在连续几代之间存在差异。此外，我们对每一代人的生活史特征之间的相互作用网络的检查表明，这种持久的跨代效应的机制高度依赖于母亲的状况。本文有简单的语言摘要。
Maternal age has important consequences for offspring fitness, with influences on size, development and reproductive schedules. Such maternal age effects may be driven by differential provisioning of resources; yet, little is known about the role of environmental supply of nutritional resources in mediating such effects.We tested the influence of limiting nutritional resource, dietary phosphorus (P), on maternal age effects across multiple generations by examining the potential interactive effects of maternal nutrition and age on daughter and granddaughter life‐history traits in the freshwater crustaceanDaphnia pulicaria.Maternal age and diet had significant but contrasting effects on offspring life history. We did not observe any evidence that age effects on offspring life history are mediated by maternal diet. However, granddaughter growth and size at maturation were influenced by the interaction between grandmaternal age and diet, suggesting that the appearance of transgenerational effects of age and diet were delayed by one generation.Because offspring life history is often linked directly and/or indirectly to life history variation in previous generations, we utilized structural equation modelling (SEM) to assess such direct or indirect relationships.SEM revealed striking differences in the relationship between growth, development time and fecundity both within and among generations, depending on the age and diet in the F0generation. Interestingly, direct and persistent relationships between the F0generation and the F2generation are most prevalent when grandmothers are old and fed low P diets, and such relationships are largely driven by fecundity in the F0generation. Additionally, indirect causal relationships between the F0generation and F2generation are most pronounced when grandmothers are young and fed low P diets or when grandmothers are old and fed high P diets.Our results indicate that transgenerational effects of maternal age and environment persist across multiple generations, and vary between successive generations. Further, our examination of the interaction network between life‐history traits of each generation suggest that the mechanisms for such persistent transgenerational effects are highly dependent on maternal condition.A plain language summary is available for this article.