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. 2018 Sep 19;6:167. doi: 10.1186/s40168-018-0555-8

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© The Author(s). 2018

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 — Non-metric multidimensional scaling (NMDS) ordination of gut microbial communities of Darwin’s finches according to a species, b island, c diet, and d season for all finches in the sample set. Taxonomic (OTU) clustering is at 97% identity and abundance weighted by taking the fourth-root of the OTU relative abundance in each finch. Ellipses represent 90% confidence windows following a multivariate t-distribution. ANOSIM p values are shown for relationships, including and excluding the vampire finch species G. septentrionalis