aquatic 103 anthropogenic 83 wastewater 81 sludge 54 terrestrial 29 built environment 29 marine 19 sewage 18 lotic 14 hydrothermal vent 13 very high temperature 13 sea floor 13 benthic 13 spring 13 low temperature 7 host-associated 5 medium temperature 5 littoral 4 plant host 4 high salinity 3 very high salinity 2 lentic 2 fluvial 1 pelagic 1 low salinity 1 stream 1 fresh water 1 very low temperature 1 animal host 1