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. 2016 Feb 25;6:22043. doi: 10.1038/srep22043

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Copyright © 2016, Macmillan Publishers Limited

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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Ordination biplots based on the redundancy analysis (RDA) of rotifer communities (A), ordination of sampling sites based on the total nitrogen (B) and the corresponding polyarthra trigla abundance in sampling sites (C) in the plain region of the Haihe River Basin. Scores of rotifer species and environmental variables in Figure A were scaled to fit the sample ordination. Species weakly associated with the first two axes (with fitness < 5%) were omitted from the ordination for clarity. Arrows in red represent rotifer taxa, while arrows in black represent measured biotic and abiotc variables. The size of circles in Figures B,C represents the relative total nitrogen concentration and the relative abundance, respectively.