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. 2018 Apr 10;8:5758. doi: 10.1038/s41598-018-24253-x

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© The Author(s) 2018

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Effect of the environment on the evolutionary history of mountain grassland soil bacterial communities. (A) Mean bacterial nearest taxon index (NTI) values across vegetation alliances versus soil pH. (B) Bacterial NTI residuals versus plant species richness residuals after removing the pH effect on both, and excluding the Calthion alliance outlier. Dots are color-coded by alliance, whereas error bars represent the standard error within each vegetation type. The line in panel A displays the quadratic trendline across all the mean NTI values, excluding the Calthion samples, with adjusted R² (Adj. Rsq.) and P-value as indicated.