Seasonal variation of temperature affects HMW-PAH accumulation in fishery species by bacterially mediated LMW-PAH degradation

文献类型： 外文期刊

第一作者： Li, Haiyan

作者： Li, Haiyan;Lai, Zini;Mai, Yongzhan;Wang, Xuesong;Peng, Songyao;Wang, Xuesong;Mai, Yongzhan

作者机构：

关键词： Polycyclic aromatic hydrocarbons (PAHs); Seasonal variation; Bacterial communities; Fishery species; Pearl River estuary

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：10.753； 五年影响因子：10.237 ）

ISSN： 0048-9697

年卷期： 2022 年 853 卷

页码：

收录情况： SCI

摘要： Currently, the specific mechanism generating seasonal variation in polycyclic aromatic hydrocarbons (PAHs) via bac-terial biodegradation remains unclear, and whether this alteration affects PAH bioaccumulation is unknown. There-fore, we performed a study between 2015 and 2020 to investigate the effects of seasonal variation on bacterial communities and PAH bioaccumulation in the Pearl River Estuary. Significantly high PAH concentrations in both aquatic and fishery species were determined in dry seasons (the mean n-ary sumation 16PAH concentration: water, 37.24 ng/L specialIntscript 30.83 ng/L specialIntscript fish, 51.01 ng/L specialIntscript and 72.60 ng/L specialIntscript compared to wet seasons (the mean n-ary sumation 16PAH concentration: water, 22.38 ng/L specialIntscript 19.40 specialIntscript fish, 25.28 ng/L specialIntscript and 32.59 ng/L (2020)). Distinct differences in taxonomic and functional composition of bacterial communities related to biodegrada-tion of low molecular weight PAHs (LMW-PAHs) were observed between seasons, and the concentrations of PAHs were negatively correlated with seasonal variation in temperature. Temperature-related specific bacterial taxa (e.g., Stenotrophomonas) directly or indirectly participated in LMW-PAH degradation via encoding PAH degradation enzymes (e.g., protocatechuate 4,5-dioxygenase) that subsequently led to bioaccumulation of high molecular weight PAHs (HMW-PAHs) in wild and fishery species due to LMW-PAHs in the water. Based on this alteration, the ecological risk posed by PAHs decreased in wet seasons, and an unbalanced spatio-temporal distribution of PAHs was observed in this estuary. These results suggest that seasonal variation of temperature affects HMW-PAH accumulation in fishery species via bacterially mediated LMW-PAH biodegradation.

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