Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 772, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2021.145064
Keywords
Marine food web; Metal; Trophic transfer; Tissue; Bio-dilution
Categories
Funding
- National Key Research and Development Program of China [2018YFC1406403]
- National Natural Science Foundation of China [41877498]
- China Postdoctoral Science Foundation [2019M651017]
- Tianjin Natural Science Foundation [19JCQNJC08100]
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The study investigated the concentrations of metals in various organs of 17 marine species and found that liver, gill, and muscle tissues are ideal indicators for analyzing metal contamination in marine environments. The results showed both bio-dilution and tissue-specific bio-magnification of metals in the studied food web, emphasizing the importance of tissue-specific considerations in enhancing risk assessment of metal elements in wildlife and human health.
Trophic transfer of metals has been well researched in aquatic food webs; however, most studies have examined the presence of metal residuals in the entire body of marine organisms and but not in specific tissues. In this study, we determined the concentrations of Cu, Cr. Pb, Zn, Cd, and Ni in various organs of 17 marine species, induding crustaceans, gastropods, bivalves, and fishes, with different trophic levels (TLs), which were collected from the Liaodong Bay, China, in July 2019. Results showed that the liver, gill, and muscle tissues of marine species are ideal indicators for analyzing Cu, Cr, Pb, Zn, Cd, and Ni contamination in marine environments. When the entire bodies of these marine species were considered, a bio-dilution in Cu, Cr, Pb, Zn, Cd, and Ni was observed in the studied food web. In contrast, the metal tissue-specific bio-magnification in the entire studied food web showed different results. In the liver and gill tissues, negative correlations were found between the concentrations of cadmium and TLs, while copper bio-dilution was also observed in gill tissue. In the muscle tissues, Cu, Pb, and Ni showed bio-dilution and trophic magnification factors of Cu, Pb, and Ni ranged from 0.44 to 0.73. This study highlights the importance of tissue-specific considerations to obtain further accurate information on metal trophodynamics and trophic transfers in marine food webs, thereby enhancing the risk assessment of many elements in wildlife and human health. (C) 2021 Elsevier B.V. All rights reserved.
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