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. 2017 Sep 25;3:21. doi: 10.1038/s41522-017-0029-y

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — rrn copy number distribution in biofilms from different streams. The rrn probability density distributions (colored areas) of core stream biofilm OTUs (glacier-fed streams = 1825 OTUs; headwaters = 1478 OTUs; mid-reaches = 1240 OTUs) are shown. Underlying box-whisker-plots indicate the median (line), interquartile range (box) and extreme values (whiskers). Asterisks highlight significant differences in median rrn between biofilms from glacier-fed streams and subalpine streams without glacier influence (Mann–Whitney U-test, p < 0.001)