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. 2021 Feb 3;11:2979. doi: 10.1038/s41598-021-82272-7

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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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(A) Relative abundance per sample of the different classes in the samples. For freshwater reactor (FR), F3–F14 samples in phase I and II with freshwater and seawater environment, respectively. For seawater reactor (SR), S3–S13 samples in phase I and II with seawater and freshwater environment, respectively. (B,C) Average relative abundances at family level of the AOB and NOB guilds, the NOB/AOB ratio and the salinity for FR reactor (B) and SR reactor (C).