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. 2015 Nov 18;6:1269. doi: 10.3389/fmicb.2015.01269

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Copyright © 2015 Uksa, Schloter, Endesfelder, Kublik, Engel, Kautz, Köpke and Fischer.

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) or licensor 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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Formation and composition of bacterial clusters of co-occurring OTUs (A–D) as revealed by network analysis (E). Each dot in the network represents one OTU at 95% similarity level and each connecting line a positive correlation with Spearman's rank correlation coefficient >0.6. For the gray colored OTUs in the network no positive correlations were found. Inner ring—phylum level; middle ring—genus or nearest classifiable level. R, rhizosphere; D, drilosphere; Bs, bulk subsoil; Bt, bulk topsoil.