Frontiers in Marine Science (Apr 2025)

Trophic transfer of mercury in marine food chains from the offshore waters of Changshan Archipelago

  • Mingyu Huo,
  • Mingyu Huo,
  • Min Pang,
  • Min Pang,
  • Xuli Ma,
  • Penggong Wang,
  • Chang Sun,
  • Chang Sun,
  • Yulong Zhang,
  • Yulong Zhang,
  • Yuchen Gong,
  • Yuchen Gong,
  • Zhenwei Sun,
  • Zhenwei Sun,
  • Zhaohui Zhang,
  • Zhaohui Zhang,
  • Zongling Wang,
  • Zongling Wang,
  • Pei Qu,
  • Pei Qu,
  • Xianxiang Luo,
  • Xianxiang Luo

DOI
https://doi.org/10.3389/fmars.2025.1566875
Journal volume & issue
Vol. 12

Abstract

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IntroductionMercury (Hg) and its organic forms can accumulate in marine organisms, undergoing biomagnification as they transfer through food chains. However, the factors affecting such Hg biomagnification are not fully understood.MethodsThis study analyzed the biomagnification of total mercury (THg) and methylmercury (MeHg) in marine food chains represented by invertebrates and fish from the offshore waters of Changshan Archipelago, grouped into continuous trophic level (TL) ranges based on nitrogen stable isotopic analysis.ResultsConcentrations of THg and MeHg ranged from 4.8 ng/g to 115.4 ng/g and 1.8 ng/g to 47.3 ng/g in invertebrates, and from 3.7 ng/g to 102.1 ng/g and 0.5 ng/g to 67.6 ng/g in fish, with TL ranges for invertebrates and fish of 1.27–2.70 and 1.97–3.60, respectively. Hg concentration increased with increasing TLs in both fish and invertebrates. Combined with nitrogen stable isotopic analysis, trophic magnification factors (TMF) were 1.51 and 1.16 for THg and MeHg in fish, and 1.95 and 1.71 for THg and MeHg in invertebrates, respectively, indicating the biomagnification of THg and MeHg in the study area. Further analysis of Hg biomagnification showed higher TMF values of Hg in both invertebrate and fish groups with higher δ13C values, suggesting that food sources influenced Hg biomagnification in marine organisms.DiscussionFood sources with lower δ13C values might reduce biomagnification efficiency of both THg and MeHg within marine fauna. These results aided understanding of Hg biomagnification in marine food chains and provided a reference for developing ways to harness Hg pollution.

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