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. 2012 Feb 27;3:45. doi: 10.3389/fmicb.2012.00045

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Copyright © 2012 Gu, Laverman and Pallud.

This is an open-access article distributed under the terms of the Creative Commons Attribution Non Commercial License, which permits non-commercial use, distribution, and reproduction in other forums, provided the original authors and source are credited.

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Ordination triplots of first two axes (RDA1 and RDA2) generated from redundancy analysis using reaction rates (NRR, SRR, APR, and NiPR) measured when the two electron acceptors were added simultaneously (treatments NS). Response variables (red vectors) include the combination of response variables (NRR and SRR). Explanatory variables (blue vectors) entered into the models were selected stepwise by Monte Carlo permutation test. Site numbers are located according to their ordination sample scores. Transform: Response variable via log 10 (x + 1), and explanatory variables via square root.