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. 2021 Jun 24;11:13298. doi: 10.1038/s41598-021-92658-2

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Plots of acetogenic community based on FTHFS gene amplicons in experimental reactor GR1 and control reactor GR2 at (a) phylum level (relative abundance (RA) > 1%), (b) genus level (RA > 1%) and (c) species level (RA > 1%). VFA, CH₄ and CO₂ represent the level of total volatile fatty acids (g/L), methane content (%) and carbon dioxide content (%), respectively. (d) Principal coordinate analysis (PCoA) plot with weighted UniFrac distance matrix visualising beta diversity of the potential acetogenic community inferred from FTHFS gene sequencing in samples from reactors GR1 and GR2 under the influence of environmental parameters carbon dioxide content (%), total VFA (g/L) and methane content (%).