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. 2017 Aug 29;7:9849. doi: 10.1038/s41598-017-10334-w

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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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Evolution of the average species richness and functional diversity from 1981 to 1988. Histograms show the number of species (N), Functional Richness (FRic), Functional Evenness (FEve), Functional Divergence (FDiv), Functional Dispersion (FDis), and Rao’s quadratic entropy (Q) indices. Error bars are standard errors with n = 10 except where indicated in the bars. Levels of significance of the t-tests are symbolized by black asterisks: ***<0.001, ** < 0.01, *<0.05. Grey asterisks in parentheses indicate levels of significance from paired t-tests.