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. 2016 Jan 22;6:1567. doi: 10.3389/fmicb.2015.01567

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Copyright © 2016 Stempfhuber, Richter-Heitmann, Regan, Kölbl, Wüst, Marhan, Sikorski, Overmann, Friedrich, Kandeler and Schloter.

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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Network analysis of interactions between NS-assigned OTUs, gene abundances and nitrification-associated nitrogen-pools in October. Depicted are Pearson correlations between three parameter groups for sampling date October: gene abundances (light blue circles), Nitrospira OTUs 01-03 (dark blue circles) and nitrate and ammonium concentrations (yellow circles), respectively. Edges between the nodes are weighted according to the correlation strength. Positive coefficients are colored in green, negatives are displayed in red. AOA, Ammonia-oxidizing archaea; NS, Nitrospira-like nitrite-oxidizing bacteria (NOB).