Counterbalancing effects of maternal mercury exposure during different stages of early ontogeny in American toads
Counterbalancing effects of maternal mercury exposure during different stages of early ontogeny in American toads
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DOI：
10.1016/j.scitotenv.2011.07.036
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发表时间：
2011-10-15
影响因子：
9.8
通讯作者：
Unrine, Jason M.
中科院分区：
文献类型：
--
作者：
Bergeron, Christine M.;Hopkins, William A.;Unrine, Jason M.
环境污染物的母体转移是一种不利的亲代效应，它会对后代的健康产生长期的影响。我们研究了汞对雌性两栖动物繁殖成功的影响，以及母体转移对后代发育的影响。美洲蟾蜍（Bufo americanus）母鼠将汞转移到其卵中，并且汞浓度与窝中成活率呈负相关。然而，当我们继续监测成功孵化的幼虫时，我们发现与对照幼虫相比，暴露于hg的母亲的幼虫的变质成功率高出21%。胚胎期的负面影响和幼虫期的正面影响相互抵消，最终导致预测的陆地招募没有差异，无论母体汞暴露程度如何。我们的研究结果表明，在个体发育的不同阶段，母体对生存的影响有可能产生复杂的结果。(C) 2011 Elsevier B.V.版权所有
Maternal transfer of environmental contaminants is a disadvantageous parental effect which can have long-lasting implications for offspring fitness. We investigated the effects of mercury (Hg) on the reproductive success of female amphibians and the subsequent effects of maternal transfer on the development of their offspring. American toads (Bufo americanus) maternally transferred Hg to their eggs, and there was a negative relationship between Hg concentrations and the percentage of viable hatchlings produced in clutches. However, when we continued to monitor larvae that successfully hatched, we found 21% greater metamorphic success in larvae from Hg-exposed mothers compared to reference larvae. The negative effect in the embryonic stage and positive effect in the larval stage counterbalanced one another, ultimately resulting in no difference in predicted terrestrial recruitment, regardless of maternal Hg exposure. Our findings demonstrate that maternal effects on survival manifesting at different stages in ontogeny have the potential to produce complicated outcomes. (C) 2011 Elsevier B.V. All rights reserved.