1 Department of Microbiology and Molecular Biology, DVGW-Technologiezentrum Wasser (TZW), Karlsruher Str. 84, 76139 Karlsruhe, Germany. Electronic address: andreas.tiehm@tzw.de.
2 Department of Evolutionary Ecology and Environmental Toxicology, Faculty Biological Sciences, Goethe University Frankfurt, Max-von-Laue-Str. 13, 60438 Frankfurt am Main, Germany; Department of Ecosystem Analysis, Institute for Environmental Research, RWTH Aachen University, Worringerweg 1, 52074 Aachen, Germany. Electronic address: hollert@bio.uni-frankfurt.de.
3 Tongji University, College of Environmental Science & Engineering, No. 1239 Siping Road, Shanghai 200092, China. Electronic address: yindq@tongji.edu.cn.
4 Chinese Research Academy of Environmental Science, No. 8 Anwai Dayangfang, Beijing 100012, China. Electronic address: zhengbh@craes.org.cn.