anthropogenic 19 sludge 19 aquatic 18 benthic 14 sediment 14 alkaline 13 lentic 13 terrestrial 13 fresh water 11 anaerobic 11 low salinity 9 high salinity 9 cropland 8 agriculture 8 very high salinity 7 lacustrine 6 medium temperature 6 groundwater 2 subsurface 2 high temperature 2 digestive tract 1 intestine 1 animal host 1 hot spring 1 lotic 1 host-associated 1 spring 1