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Marine pollution, ecotoxicology and sustainability
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Biomagnification Potential of Arsenic in Marine Food Chains
Monday 7th @ 1530-1550, Conference Room 7
Li Zhang* , Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences
Sen Du, Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences
Presenter Email: zhangli@scsio.ac.cn |
| Arsenic (As) is one of the most hazardous environmental pollutants and widely exists in the coastal area. Marine organisms usually accumulate high level of arsenic which is mainly as organic species with low toxicity. Arsenic could be biomagnified along some marine food chains/webs, e.g. seagrass and mangrove ecosystems, resulting in the high bioaccumulation in higher trophic levels and potential harm to the organisms; in contrast, arsenic is commonly biodiminished in freshwater food chains/webs. Marine fish and shellfish could biotransform inorganic arsenic into arsenobetaine (AsB). Organic arsenic had higher trophic transfer ability than inorganic species which may cause fish accumulate more arsenic. Arsenic biomagnification is most probably related to the high content of organic arsenic species in marine organisms. The future research should pay more attention to the biomagnification potential of different arsenic speciation and identify by indoor experiments. It will be helpful for our better understanding of the ecotoxicology and biogeochemistry of arsenic, the assessment of the ecological risks of arsenic, and the safeguard of the marine ecological safety. |
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