Methylmercury Bioaccumulation in Deepest Ocean Fauna: Implications for Ocean Mercury Biotransport through Food Webs
Methylmercury Bioaccumulation in Deepest Ocean Fauna: Implications for Ocean Mercury Biotransport through Food Webs
复制标题
最深海洋动物群中的甲基汞生物富集：对通过食物网进行海洋汞生物传输的影响
DOI：
10.1021/acs.estlett.0c00299
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发表时间：
2020-07-14
影响因子：
10.9
通讯作者：
Xu, Yunping
中科院分区：
文献类型：
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作者：
Liu, Maodian;Xiao, Wenjie;Xu, Yunping
对于许多污染物来说，超深渊区（深度从6000 m到11000 m）可能是探索最少的环境。在这项工作中，我们揭示了生物积累的甲基汞（甲基汞），一种有效的神经毒素，可以大量的海洋食物网内的生物积累，在片足类动物从马里亚纳群岛，马索，和新不列颠海沟。我们确定了高水平的汞（Hg）和甲基汞的湿重范围从47至435纳克/克和3.8至61纳克/克，分别从这些战壕的片足类动物。将甲基汞水平与以前的值进行更广泛的比较，我们发现，这项研究中的甲基汞水平显着高于世界各地许多其他水生环境。高甲基汞水平在很大程度上取决于食物供应，这可能与海洋表层生产、陆地输入和海洋食物网中的甲基汞生物积累有关。基于脂肪酸、放射性碳（δ C-14）和稳定碳同位素（δ C-13）分析的甲基汞水平的分布和变化趋势的比较支持我们的假设。我们的研究表明，人类活动输入海洋表层的汞可以通过海洋食物网迅速输送到世界最深的海洋，并强调了深海海沟不是生物沙漠。
For many contaminants, the hadal zone (from 6000 to 11000 m depth) is potentially the least explored environment. In this work, we reveal the bioaccumulation of methylmercury (MeHg), a potent neurotoxin that can be substantially bioaccumulated within marine food webs, in amphipod fauna from the Mariana, Massau, and New Britain trenches. We identified high levels of mercury (Hg) and MeHg ranging in wet weight from 47 to 435 ng/g and from 3.8 to 61 ng/g, respectively, in amphipods from these trenches. Placing the MeHg level into a broader comparative context with previous values, we found that the MeHg level in this study is significantly higher than that from many other aquatic environments around the world. High MeHg levels are largely dependent on food availability, which is probably related to surface ocean production, terrestrial input, and MeHg bioaccumulation in marine food webs. Comparisons of the distribution and variation trends of MeHg levels based on fatty acid, radiocarbon (Delta C-14), and stable carbon isotope (delta C-13) analyses supported our hypothesis. Our study suggests that anthropogenic Hg inputs into surface oceans could be rapidly transported to the world's deepest oceans through marine food webs and highlights that hadal trenches are not biological deserts.