How does predation affect the bioaccumulation of hydrophobic organic compounds in aquatic organisms?

Environmental Science & Technology
Xinghui XiaHaotian Wang

Abstract

It is well-known that the body burden of hydrophobic organic compounds (HOCs) increases with the trophic level of aquatic organisms. However, the mechanism of HOC biomagnification is not fully understood. To fill this gap, this study investigated the effect of predation on the bioaccumulation of polycyclic aromatic hydrocarbons (PAHs), one type of HOC, in low-to-high aquatic trophic levels under constant freely dissolved PAH concentrations (1, 5, or 10 μg L(-1)) maintained by passive dosing systems. The tested PAHs included phenanthrene, anthracene, fluoranthene, and pyrene. The test organisms included zebrafish, which prey on Daphnia magna, and cichlids, which prey on zebrafish. The results revealed that for both zebrafish and cichlids, predation elevated the uptake and elimination rates of PAHs. The increase of uptake rate constant ranged from 20.8% to 39.4% in zebrafish with the amount of predation of 5 daphnids per fish per day, and the PAH uptake rate constant increased with the amount of predation. However, predation did not change the final bioaccumulation equilibrium; the equilibrium concentrations of PAHs in fish only depended on the freely dissolved concentration in water. Furthermore, the lipid-normalized water-based...Continue Reading

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Citations

Aug 28, 2016·Environmental Science and Pollution Research International·Pardeep SinghPradeep Kumar Mishra
Mar 8, 2017·Frontiers in Microbiology·Efstratios NikolaivitsEvangelos Topakas
Mar 20, 2018·Journal of Environmental Sciences (China)·Haotian WangXinyue Xiong
Mar 19, 2019·Environmental Science & Technology·Haotian WangJohn C Crittenden

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