terrestrial 264 soil 185 anthropogenic 158 aquatic 137 host-associated 133 plant host 109 rhizosphere 86 wastewater 60 agriculture 52 sludge 46 animal host 24 lentic 22 fresh water 22 forest 21 insect host 20 wetland 20 paludal 20 built environment 19 cropland 17 very low temperature 15 ice 13 permafrost 11 sewage 10 low salinity 9 contaminated 8 acidic 8 food 8 mine 8 stream 8 medium temperature 7 dairy product 6 subsurface 6 littoral 6 groundwater 6 plant litter 5 tundra 4 grassland 3 spring 3 digestive tract 3 intestine 3 lotic 3 sediment 3 phyllosphere 2 hospital 2 waste 2 mammalian host 2 fermented food 2 benthic 2 low temperature 2 lacustrine 2 hot spring 2 sea floor 1 industrialized 1 hydrothermal vent 1 marine 1 medium salinity 1 human host 1 high temperature 1 lake bed 1 skin 1 fluvial 1 stream bed 1 very high temperature 1