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. 2018 Dec 4;6:215. doi: 10.1186/s40168-018-0597-y

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© The Author(s). 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 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.

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Fig. 4 — Namib Desert speargrasses rhizosheath-root systems recruitment process. a Bipartite network analysis of microbial communities (bacteria and fungi) associated with speargrass rhizosheath-root system and bulk sand. Edges connecting sample nodes to SV’ nodes were coloured according to their environmental source (black shade, root tissues; red shades, rhizosheath; blue shades, rhizosphere; yellow, sand soil). b, c Ternary plot revealing relative abundance (dot size) and generalist or plant species-specific behaviours of bacterial and fungal SVs among speargrasses. d, e Venn diagram detecting bacterial and fungal specialist (speargrass-specific) and generalist SVs (shared among speargrasses)