Transgenerational effects of poor elemental food quality on Daphnia magna
Transgenerational effects of poor elemental food quality on Daphnia magna
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DOI：
10.1007/s00442-009-1517-4
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发表时间：
2010-04-01
期刊：
影响因子：
2.7
通讯作者：
Zalewski, Alexandra
中科院分区：
文献类型：
--
作者：
Frost, Paul C.;Ebert, Dieter;Zalewski, Alexandra
环境对亲本的影响可以强烈地影响其后代的表型，从而改变性状的遗传力和后代对环境的反应。我们研究了是否P限制的水生无脊椎动物，大型蚤，改变其后代的反应，磷营养不足。母亲水蚤消费磷贫藻类食物产生较小的新生儿具有较低的身体磷含量相比，控制（磷丰富）的母亲。这些后代从P压力的母亲，当喂养富含P的食物，生长速度更快，并复制相同的时间表，从P充足的母亲。相比之下，来自P-应激母亲的后代，当喂食P-贫乏食物时，与对照母亲所生的姐妹篇相比，生长更慢，并且延迟了繁殖。也有微弱的证据表明，来自P压力母亲的女儿更容易受到致命细菌多枝巴斯德菌的感染。我们的研究结果表明，磷胁迫不仅是跨代转移，而且其对后代的影响取决于自己的环境质量。因此，母亲的磷营养可以确定后代对食物磷含量的反应的性质，并可能混淆后代的表现和他们自己的营养之间的关系。考虑到食物质量在自然环境中和自然环境之间存在很大差异，我们的研究结果表明，母体效应应作为一个额外的维度纳入元素营养如何影响动物消费者的生理，生态和进化的研究。
Environmental effects on parents can strongly affect the phenotype of their offspring, which alters the heritability of traits and the offspring's responses to the environment. We examined whether P limitation of the aquatic invertebrate, Daphnia magna, alters the responses of its offspring to inadequate P nutrition. Mother Daphnia consuming P-poor algal food produced smaller neonates having lower body P content compared to control (P-rich) mothers. These offspring from P-stressed mothers, when fed P-rich food, grew faster and reproduced on the same schedule as those from P-sufficient mothers. In contrast, offspring from P-stressed mothers, when fed P-poor food, grew more slowly and had delayed reproduction compared to their sisters born to control mothers. There was also weak evidence that daughters from P-stressed mothers are more susceptible to infection by the virulent bacterium, Pasteuria ramosa. Our results show that P stress is not only transferred across generations, but also that its effect on the offspring generation varies depending upon the quality of their own environment. Maternal P nutrition can thus determine the nature of offspring responses to food P content and potentially obfuscates relationships between the performance of offspring and their own nutrition. Given that food quality can be highly variable within and among natural environments, our results demonstrate that maternal effects should be included as an additional dimension into studies of how elemental nutrition affects the physiology, ecology, and evolution of animal consumers.