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• W2886375830 abstract "AEI Aquaculture Environment Interactions Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections AEI 10:413-427 (2018) - DOI: https://doi.org/10.3354/aei00278 Effects of finfish aquaculture on biogeochemistry and bacterial communities associated with sulfur cycles in highly sulfidic sediments Ayeon Choi1, Hyeyoun Cho1, Bomina Kim1, Hyung Chul Kim2, Rae-Hong Jung2, Won-Chan Lee2, Jung-Ho Hyun1,* 1Department of Marine Science and Convergent Technology, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan, Gyeonggi-do 15588, Republic of Korea 2Marine Environment Research Division, National Institute of Fisheries Science (NIFS), Busan 619-902, Republic of Korea *Corresponding author: hyunjh@hanyang.ac.kr ABSTRACT: A combination of biogeochemical analyses and molecular microbiological analyses were conducted to assess the environmental impact of finfish aquaculture and to elucidate the major microbial assemblages responsible for the production and removal of reduced sulfur compounds in fish-farm sediments. The average concentrations of H2S (123 µM) and NH4+ (1310 µM) and the dissimilatory sulfite reductase (dsr) gene copy number (1.9 × 109 copies cm-3) in the sediments at the farm site were 15-, 1.5- and 2-fold higher, respectively, than those measured at the less-impacted reference site. Accordingly, the sulfate reduction rate (SRR) at the farm site (118 mmol m-2 d-1) was 19-fold higher than that measured at the reference site (6.2 mmol m-2 d-1). Analyses of dsrA and 16S rRNA gene sequences revealed that the Syntrophobacteraceae and Desulfobulbaceae groups are the major sulfate-reducing bacteria around the fish-farm sediment. Interestingly, despite the high SRR (12.2-19.6 mmol m-2 d-1), the H2S concentration was low (<8 µM) in the top 0-2 cm of the fish-farm sediments. In this sulfide-mismatched zone, sulfur-oxidizing bacteria associated with Gamma- and Epsilonproteobacteria were abundant. Especially at the 1-2 cm depth, bacteria related to Sulfurovum in the Epsilonproteobacteria showed the highest relative abundance, comprising 62% of the 16S rDNA sequences. The results strongly suggest that Sulfurovum-like bacteria play a significant ecological and biogeochemical role in oxidation and reduction of reduced sulfur compounds from the organic-rich, highly sulfidic fish-farm sediments. KEY WORDS: Aquaculture impacts · Benthic metabolism · Sulphidic environment · Sulfate reduction · Sulfate-reducing bacteria · Sulfur-oxidizing bacteria · Sulfurovum Full text in pdf format Supplementary material PreviousNextCite this article as: Choi A, Cho H, Kim B, Kim HC, Jung RH, Lee WC, Hyun JH (2018) Effects of finfish aquaculture on biogeochemistry and bacterial communities associated with sulfur cycles in highly sulfidic sediments. Aquacult Environ Interact 10:413-427. https://doi.org/10.3354/aei00278 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in AEI Vol. 10. Online publication date: September 27, 2018 Print ISSN: 1869-215X; Online ISSN: 1869-7534 Copyright © 2018 Inter-Research." @default.
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• W2886375830 date "2018-09-27" @default.
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• W2886375830 title "Effects of finfish aquaculture on biogeochemistry and bacterial communities associated with sulfur cycles in highly sulfidic sediments" @default.
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