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. 2017 Apr 25;8:750. doi: 10.3389/fmicb.2017.00750

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Copyright © 2017 Saarenheimo, Aalto, Rissanen and Tiirola.

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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Study sites and sampling points. White points represent control sampling points, black points wastewater discharge sampling points, dark gray 100 m downstream sampling points and light gray 200/250 m downstream sampling points. Left: Keuruu, right: Petäjävesi.