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MEPS
Marine Ecology Progress Series

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MEPS 634:45-61 (2020)  -  DOI: https://doi.org/10.3354/meps13182

Acetate-utilizing microbial communities revealed by stable-isotope probing in sediment underlying the upwelling system of the Ulleung Basin, East Sea

Hyeyoun Cho1, Bomina Kim1, Jin-Sook Mok1, Ayeon Choi1, Bo Thamdrup2, Jung-Ho Hyun1,*

1Department of Marine Sciences and Convergent Technology, Hanyang University, 55 Hanyangdaehak-ro, Ansan, Gyeonggi-do 15588, South Korea
2Nordic Center for Earth Evolution, Institute of Biology, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark
*Corresponding author:

ABSTRACT: Molecular analyses and biogeochemical measurements were combined to investigate the microbial communities associated with major terminal electron accepting processes and acetate oxidation at 2 contrasting sediments on the continental shelf (EB1) and basin (EB6) of the Ulleung Basin, East Sea. At EB1, sulfate reduction (SR) and iron reduction (FeR) dominated organic carbon (Corg) oxidation, accounting for 65 and 25% of anaerobic Corg oxidation, respectively. In contrast, manganese reduction (MnR) was responsible for >50% of anaerobic Corg mineralization at manganese oxide-rich EB6. Members of Desulfobacteraceae, known as putative sulfate-reducing bacteria (SRB), constituted a major Corg-oxidizing clade (22% of Bacteria) at EB1. Meanwhile, putatively Mn-reducing bacteria affiliated with Colwelliaceae, Shewanellaceae and Oceanospirillaceae were abundant in EB6 (8% of Bacteria). RNA-stable isotope probing (RNA-SIP) further identified Arcobacter as acetate-oxidizers associated with FeR, while no SRB were labeled at EB1. At EB6, microorganisms affiliated with Colwelliaceae and Oceanospirillaceae were identified as putative Mn-reducing acetate-oxidizers. Interestingly, at both sites, Thaumarchaeota were labeled with 13C derived from acetate during the anoxic incubations. The results from RNA-SIP give new insights into the biogeochemical and ecological role of Arcobacter in FeR, and the metabolic activity of Thaumarchaeota under anoxia. As the upwelling intensity in the UB declines due to the rapid warming of surface waters, our results are relevant for evaluation of future changes in benthic biogeochemical processes and microbial communities in response to the variations of water-column productivity.


KEY WORDS: Acetate-oxidizing bacteria · Benthic microbial communities · East Sea · Organic carbon oxidation · RNA-SIP · Ulleung Basin


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Cite this article as: Cho H, Kim B, Mok JS, Choi A, Thamdrup B, Hyun JH (2020) Acetate-utilizing microbial communities revealed by stable-isotope probing in sediment underlying the upwelling system of the Ulleung Basin, East Sea. Mar Ecol Prog Ser 634:45-61. https://doi.org/10.3354/meps13182

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