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. 2016 May 24;16:26. doi: 10.1186/s12898-016-0080-1

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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. 1 — Boxplots of plant specialization indices at different communities on the Yulong Mountain, SW China. YSZ 2725 m above sea level; HLG 3235 m above sea level; YK 3670 m above sea level; DYF 3910 m above sea level. The bottom and top limits of each box are the lower and upper quartiles, respectively. The horizontal black lines across boxes are medians. Error bars represent the 95 % confidence interval of the median. a Pollen vector diversity (Shannon’s diversity index); b selectiveness (d’ index)