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. 2016 Oct 4;6:34342. doi: 10.1038/srep34342

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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1: upstream Hubei Province; 2: upper and middle reaches Huna Province; 3: upper and middle reaches Hubei Province; 4: middle reaches Anhui Province; 5: downstream Jiangsu Province. Horizontal line represent the median, boxes span the interquartile range, and whiskers the non-outlier ranges. Circles denote outliers. The figure was drawn by R version 3.0.2.