Trophic strategy of diverse methanogens across a river-to-sea gradient

Bingchen Wang; Fanghua Liu; Shiling Zheng; Qinqin Hao

doi:10.1007/s12275-019-8482-3

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Trophic strategy of diverse methanogens across a river-to-sea gradient: Bingchen Wang ^1,2,3, Fanghua Liu ^1,2, Shiling Zheng ¹, Qinqin Hao ^1,3; Journal of Microbiology 2019;57(6):470-478.
DOI: https://doi.org/10.1007/s12275-019-8482-3
Published online: May 27, 2019

¹Key Laboratory of Coastal Biology and Biological Resources Utilization, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, P. R. China, ²Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, P. R. China, ³University of Chinese Academy of Sciences, Beijing 100049, P. R. China

Corresponding author: Fanghua Liu , Tel: +86-535-210-9268,
Shiling Zheng , Tel: +86-535-210-9268,

Received: 4 September 2018 • Revised: 14 November 2018 • Accepted: 19 December 2018

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Abstract

Methanogens are an important biogenic source of methane, especially in estuarine waters across a river-to-sea gradient. However, the diversity and trophic strategy of methanogens in this gradient are not clear. In this study, the diversity and trophic strategy of methanogens in sediments across the Yellow River (YR) to the Bohai Sea (BS) gradient were investigated by high-throughput sequencing based on the 16S rRNA gene. The results showed that the diversity of methanogens in sediments varied from multitrophic communities in YR samples to specific methylotrophic communities in BS samples. The methanogenic community in YR samples was dominated by Methanosarcina, while that of BS samples was dominated by methylotrophic Methanococcoides. The distinct methanogens suggested that the methanogenic community of BS sediments did not originate from YR sediment input. High-throughput sequencing of the mcrA gene revealed that active Methanococcoides dominated in the BS enrichment cultures with trimethylamine as the substrate, and methylotrophic Methanolobus dominated in the YR enrichment cultures, as detected to a limited amount in in situ sediment samples. Methanosarcina were also detected in this gradient sample. Furthermore, the same species of Methanosarcina mazei, which was widely distributed, was isolated from the area across a river-to-sea gradient by the culture-dependent
method
. In summary, our results showed that a distribution of diverse methanogens across a river-to-sea gradient may shed light on adaption strategies and survival mechanisms in methanogens.

Keywords: trophic strategy;methanogens;diversity;Bohai Sea (BS);river to sea gradient

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Trophic strategy of diverse methanogens across a river-to-sea gradient

J. Microbiol. 2019;57(6):470-478. Published online May 27, 2019

DOI: https://doi.org/10.1007/s12275-019-8482-3

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