Journal
MARINE POLLUTION BULLETIN
Volume 124, Issue 2, Pages 1055-1062Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2016.12.030
Keywords
PBDEs; Functional bacteria; Anaerobic degradation; Mangrove
Funding
- City University of Hong Kong [7004394]
- National Natural Science Foundation of China [41576086, 41306084]
- Innovation of Science, Technology Commission of Shenzhen Municipality [JCYJ20150416163041307]
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The removal and degradation of polybrominated diphenyl ethers (PBDEs) in sediments are not clear. The vertical distribution of total and dehalogenating bacteria in sediment cores collected from a typical mangrove swamp in South China and their intrinsic degradation potential were investigated. These bacterial groups had the highest abundances in surface sediments (0-5 cm). A 5-months microcosm experiment also showed that surface sediments had the highest rate to remove BDE-47 than deeper sediments (5-30 cm) under anaerobic condition. The deeper sediments, being more anaerobic, had lower population of dehalogenating bacteria leading to a weaker BDE-47 removal potential than surface sediments. Stepwise multiple regression analysis indicated that Dehalococcoides spp. were the most important dehalogenating bacteria affecting the anaerobic removal of BDE-47 in mangrove sediments. This is the first study reporting that mangrove sediments harbored diverse groups of dehalogenating bacteria and had intrinsic potential to remove PBDE contamination. (C) 2016 Elsevier Ltd. All rights reserved.
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