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. 2018 Jun 15;18:94. doi: 10.1186/s12862-018-1213-2

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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. 2 — Clustering of samples. Sample assignment to six clusters (colors) with the program Structure shows consistent geographic differentiation between sampling times. Here, new and old refers to the two sampling years specified in Fig. 1