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Concentration of polychlorinated biphenyls and risk assessment in finless porpoises from the East China Sea

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Abstract

Polychlorinated biphenyls (PCBs) are bioaccumulative persistent organic pollutants with a great impact on cetaceans. To examine the content of PCBs and their risks to finless porpoises, this study determined the concentrations of seven typical PCB congeners in 56 tissue samples of East Asian finless porpoises (EAFPs) sampled in 2009–2012 from Ningbo (29.8835° N, 122.0644° E), Pingtan (25.5133° N, 119.8172° E) and Lvsi (32.1035° N, 121.6078° E). PCB138, PCB153 and PCB101 were the predominant congeners, accounting for 31.15%, 18.59% and 15.75%, respectively, of all PCBs detected. The content of PCBs increased with age in males but decreased from juveniles to adults in females due to transfer to calves by reproduction and lactation. EAFPs in Ningbo and Pingtan accumulated more PCBs than those in Lvsi Port. The trophic positions of EAFPs from Lvsi, Pingtan and Ningbo were 9.41, 8.95 and 9.43, respectively. PCB concentrations did not accumulate significantly with increasing trophic levels. The risk quotient index indicated that the risk of trichlorobiphenyl (3-PCB), tetrachlorobiphenyl (4-PCB), pentachlorobiphenyls (5-PCB), and hexachlorobiphenyls (6-PCB) to EAFPs in the East China Sea was generally low and within safe limits thus far.

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Acknowledgements

The authors owe deepest partifue and appreciation to Prof. Cheng Sun for his great help in PCBs detection.

Funding

We thank Nanjing Yangtze Finless Porpoise Provincial Nature Reserve porpoise activity habits and habitat environment research and evaluation project, the NSF of Jiangsu Province of China (BK20171475), and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

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  1. Jiangsu Key Laboratory for Biodiversity and Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, 210023, China

    Bingyao Chen, Huiping Jiang, Hui Wang, Guang Yang & Xiuqing Hao

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Contributions

BC designed the experiment, revised manuscript; HW and XH implemented the experiment; HJ analyzed the data and completed the first draft of the manuscript; GY, Conceptualization; BC, XH checked and edited the final manuscript.

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Correspondence to Bingyao Chen.

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All authors declare that there is no conflict of interests.

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The experimental protocol involved in the present study was approved by the Institutional Animal Care and Use Committee of Nanjing Normal University.

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Chen, B., Jiang, H., Wang, H. et al. Concentration of polychlorinated biphenyls and risk assessment in finless porpoises from the East China Sea. Toxicol Res. 40, 259–271 (2024). https://doi.org/10.1007/s43188-023-00221-0

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