anthropogenic 36 aquatic 33 terrestrial 27 alkaline 25 fresh water 25 sludge 21 subsurface 14 sediment 14 benthic 14 groundwater 14 lentic 13 fermented food 13 food 13 anaerobic 13 low salinity 12 high salinity 9 agriculture 9 cropland 9 very high salinity 7 medium temperature 6 lacustrine 6 host-associated 2 animal host 2 contaminated 2 high temperature 2 low temperature 1 mine 1 lotic 1 intestine 1 soil 1 spring 1 hot spring 1 acidic 1 digestive tract 1