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首页> 外文期刊>Environmental toxicology and chemistry >EVALUATING MERCURY BIOMAGNIFICATION IN FISH FROM A TROPICAL MARINE ENVIRONMENT USING STABLE ISOTOPES (δ~(13)C AND δ~(15)N)
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EVALUATING MERCURY BIOMAGNIFICATION IN FISH FROM A TROPICAL MARINE ENVIRONMENT USING STABLE ISOTOPES (δ~(13)C AND δ~(15)N)

机译：用稳定同位素（δ〜（13）C和δ〜（15）N）估算热带海洋环境中鱼类的汞生物放大率

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摘要

Concentrations of total mercury (T-Hg) and methylmercury (MeHg) were measured in zooplankton and 13 fish species from a coastal food web of the Gulf of Oman, an arm of the Arabian Sea between Oman and Iran. Stable isotope ratios (δ~(13)C and δ~(15)N) also were determined to track mercury biomagnification. The average concentration of T-Hg in zooplankton was 21 ± 8.0 ng g~(-1) with MeHg accounting 10% of T-l[g. Total mercury levels in fish species ranged from 3.0 ng g~(-1) (Sardinella longiceps) to 760 ng g~(-1) (Rhizoprionodon acutus) with relatively lower fraction of MeHg (72%) than that found in other studies. The average trophic difference (△δ~(13)C) between zooplankton and planktivorous fish (Selar crumenopthalmus, Rastrelliger kanagurta, and S. longiceps) was higher (3.4‰) than expected, suggesting that zooplankton may not be the main diet or direct carbon source for these fish species. However, further sampling would be required to compensate for temporal changes in zooplankton and the influence of (heir lipid content. Trophic position inferred by δ~(15)N and and slopes of the regression equations (log_(10)[T-Hg] = 0. 13[δ~(15)N] -3.57 and log_(10)[MeHg] = 0.14[δ~(15)N] - 3.90) as estimates of biomagnification indicate that biomagnification of T-Hg and MeHg was lower in this tropical ocean compared to what has been observed in arctic and temperate ecosystems and tropical African lakes. The calculated daily intake of methylmercury in the diet of local people through fish consumption was well below the established World Health Organization (WHO) tolerable daily intake threshold for most of the fish species except Euthynnus affinis, Epinephelus epistictus, R. acutus, and Thunnus tonggol, illustrating safe consumption of the commonly consumed fish species.
机译：在阿曼和伊朗之间的阿拉伯海之臂阿曼湾的沿海食物网中，测量了浮游动物和13种鱼类中总汞（T-Hg）和甲基汞（MeHg）的浓度。还确定了稳定的同位素比（δ〜（13）C和δ〜（15）N）来跟踪汞的生物放大倍数。浮游动物中T-Hg的平均浓度为21±8.0 ng g〜（-1），其中MeHg占T-1 [g]的10％。鱼种中的总汞含量范围从3.0 ng g〜（-1）（长沙丁氏沙丁鱼）到760 ng g〜（-1）（尖头pr虫），其中MeHg的含量相对较低（72％）。浮游动物与浮游鱼类（Selar crumenopthalmus，Rastrelliger kanagurta和S. longiceps）之间的平均营养差（△δ〜（13）C）高于预期（3.4‰），表明浮游动物可能不是主要的饮食或直接的饮食这些鱼类的碳源。然而，将需要进一步采样以补偿浮游动物的时间变化和（继承人脂质含量的影响。由δ〜（15）N和回归方程的斜率（log_（10）[T-Hg]推断的营养位置= 0. 13 [δ〜（15）N] -3.57和log_（10）[MeHg] = 0.14 [δ〜（15）N]-3.90），生物放大倍数表明T-Hg和MeHg的生物放大倍数较低与在北极和温带生态系统以及热带非洲湖泊中观察到的情况相比，通过食用鱼类计算的当地人饮食中甲基汞的每日摄入量远低于世界卫生组织（WHO）规定的每日容许摄入量阈值对于大多数鱼类而言，除了百里香（Euthynnus affinis），大鳍金枪鱼（Epinephelus epistictus），R。acutus和金枪鱼（Thunnus tonggol），这说明了常见食用鱼类的安全食用。

著录项

  • 来源
    《Environmental toxicology and chemistry》 |2007年第8期|1572-1581|共10页
  • 作者

    Hassan A. Al-Reasi; Fuad A. Ababneh; David R. Lean;

  • 作者单位

    Department of Biology, P.O. Box 450 Station A, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada;

    Department of Chemistry, P.O. Box 450 Station A, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada;

    Department of Biology, P.O. Box 450 Station A, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    gulf of Oman; total mercury; methylmercury; trophic positions; fish;

    机译：阿曼湾;总汞甲基汞营养位置;鱼;

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