Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China; State Key Laboratory in Marine Pollution, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China.
Key Laboratory of Integrated Regulation and Resource Department on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Xikang Road, Nanjing 210098, China.
Sci Total Environ. 2018 Feb 1;613-614:644-652. doi: 10.1016/j.scitotenv.2017.09.130. Epub 2017 Sep 18.
Indigenous microorganisms in sediments could degrade polybrominated diphenyl ethers (PBDEs), but how the microbial communities respond to PBDEs was seldom reported. The effect of BDE-153, a common congener in aquatic environments, on the microbial communities in four types of aquatic sediments was evaluated during the 150days' incubation under an anaerobic condition. The intrinsic potential to remove BDE-153 varied significantly among four sediment types, and the removal rates of mangrove, mudflat, marine and freshwater sediments were 0.013, 0.013, 0.011, and 0.009day, respectively. The observed microbial species, Simpson, Shannon, and Chao1 indices in all sediments were rather stable and were not changed significantly by BDE-153 amendment. However, BDE-153 amendment altered the microbial community compositions in three saline sediments at the end of the incubation period. Distance-based multivariate multiple regression analysis revealed that salinity, total organic carbon (TOC) and BDE-52, the major debromination product of BDE-153, were the three main factors explaining the variations in microbial community compositions in BDE-treated sediments; whereas salinity, TOC and pH were the main contributing factors in control sediments without BDE-153. The daughter congeners generated during anaerobic debromination process need more attention, especially their effect on the microbial communities in aquatic sediments.
沉积物中的土著微生物可以降解多溴二苯醚（PBDEs），但微生物群落对 PBDEs 的响应如何却鲜有报道。在厌氧条件下培养 150 天后，评估了 BDE-153（一种常见的水生环境同系物）对四种类型水生沉积物中微生物群落的影响。四种沉积物类型去除 BDE-153 的内在潜力差异显著，红树林、泥滩、海洋和淡水沉积物的去除率分别为 0.013、0.013、0.011 和 0.009 天-1。所有沉积物中的观察到的微生物种类、辛普森、香农和 Chao1 指数都相当稳定，并且不受 BDE-153 加标处理的显著影响。然而，BDE-153 加标处理在培养期末改变了三种盐渍沉积物中的微生物群落组成。基于距离的多元多回归分析表明，盐度、总有机碳（TOC）和 BDE-153 的主要脱溴产物 BDE-52 是解释 BDE 处理沉积物中微生物群落组成变化的三个主要因素；而盐度、TOC 和 pH 是无 BDE-153 对照沉积物中的主要贡献因素。在厌氧脱溴过程中产生的女儿同系物需要更多关注，特别是它们对水生沉积物中微生物群落的影响。
