单甲基同位素揭示了海洋生态系统中隐藏的生物放大路径及其对环境的影响
Shaochen Yang1, Xingyu Liang1,2, Sae Yun Kwon3
1State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China.
Environmental science & technology
|February 9, 2026
概括
与此前的假设相反,地通路对沿海鱼类中的甲基 (MMHg) 是至关重要的. 这项研究使用同位素来揭示海洋食物网中的MMHg来源.
科学领域:
- 环境化学环境化学
- 海洋生态海洋生态学
- 毒理学 毒理学 毒理学
背景情况:
- 单甲基 (MMHg) 是一种在海鲜中发现的神经毒素.
- 在海洋食物网中量化MMHg生物放大途径是复杂的.
- 浮游生物和谷底生物通路对鱼类的MMHg水平有不同的贡献.
研究的目的:
- 要区分鱼类中MMHg的浮游生物和盆地生物放大通路.
- 评估这些途径在不同海洋区域 (近岸湾,大陆架,大陆海洋) 的贡献.
- 为了突出 (Hg) 化合物特定同位素分析 (CSIA) 在追踪MMHg动态方面的实用性.
主要方法:
- 化合物特定同位素分析 (CSIA) 的Hg.
- 对鱼类MMHg和总 (THg) 的 Δ199Hg 的分析.
- 一个MMHg同位素二元混合模型的应用.
主要成果:
- 在MMHg和THg之间的Δ199Hg显著差异表明使用THg同位素的局限性.
- 靠近海岸的海湾鱼的MMHg同位素标志与盆地无脊椎动物相匹配.
- 货架和海底鱼类中的MMHg同位素标志与植物浮游生物一致.
结论:
- 盆地生物放大通路是近海鱼类中MMHg的重要来源 (约. 85%) 的情况.
- 浮游生物通路 (海水 - 植物浮游生物转移) 在架和海底鱼类 (90%以上) 中主导MMHg.
- 之前的模型可能低估了骨盆路径的作用,影响了Hg循环和人类暴露评估.
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