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. 2016 Aug 8;4:42. doi: 10.1186/s40168-016-0189-7

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© The Author(s). 2016

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 — Bacterial abundance RDA correlation biplots constrained by selected explanatory variables. The sites and explanatory variables (a) and genera (b) plots are presented separately for clarity; however, they are derived from the same RDA model, note the difference in axes scales. RDA1 and RDA2 which explain over 10 % of total variation in beta diversity are plotted. The global model’s P value was calculated using the Monte Carlo Permutation Procedure (MCPP). In plot A, subjects are color coded according to their CRF levels for illustrative purposes only as groupings were not included in the model. Black circles represent centroids for the categorical variable sex