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. 2018 Jan 25;9:38. doi: 10.3389/fmicb.2018.00038

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Copyright © 2018 Pei, Yu, Ji, Khan and Li.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Location of sampling sites along the Gansu industrial reach of the Yellow River. Three categories are uncontaminated regions – Xincheng district (XC) and upstream of Xigu district (XGU), slightly contaminated regions - downstream of Xigu district (XGD) and the Liujiaxia reservoir (LJX) and heavily contaminated regions - Xigu district (XG) and Chengguan district (CG). The arrows indicated the flowing direction of the Yellow River.