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. 2018 Oct 29;9:2526. doi: 10.3389/fmicb.2018.02526

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Copyright © 2018 Levy and Jami.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Prokaryotic population structure across the different fractions. (A) OTU richness (≥97% similarity) and (B) Chao1 index of the free-living and protozoa associated prokaryotic community. (C) Non-metric multidimensional scaling (NMDS) based on the OTU similarity matrix obtained using the Bray–Curtis index. Each point represents a different sample plotted according to their OTU composition and abundance. A greater distance between two points infers a lower similarity between the prokaryotic community compositions. Color-coding represents the different fractions assessed.