anthropogenic 153 aquatic 141 sludge 126 wastewater 104 terrestrial 64 built environment 46 fresh water 34 low salinity 31 medium temperature 29 lacustrine 22 lentic 22 very low temperature 12 anaerobic 5 soil 4 brackish water 4 sewage 4 estuary 4 medium salinity 4 ice 3 rhizosphere 2 littoral 2 marine 2 host-associated 2 plant host 2 stream 2 subsurface 2 groundwater 2 low temperature 1 agriculture 1 forest 1