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. 2020 Jul 17;20:212. doi: 10.1186/s12866-020-01894-5

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© The Author(s) 2020

Open AccessThis 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/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 3 — Diversity metrics of the samples. a Alpha diversity (Shannon’s diversity). b Principal coordinates analysis based on Bray-Curtis distances. The samples were color-coded for the DNA extraction protocols (top) and for individuals (bottom), respectively. c Bray-Curtis distances 1) between samples from the same protocol and different individuals (SP-DI), 2) between samples from different protocols and the same individual (DP-SI: P vs SB, P vs S, and S vs SB), and 3) between samples from the same protocol and the same individual (SP-SI, replicate samples). (* P-value < 0.05, *** P-value < 0.001; Kruskal-Wallis test with Dunn’s multiple comparison test)