aquatic 1,380 terrestrial 955 marine 805 soil 780 fresh water 404 pelagic 379 low salinity 356 lentic 276 anthropogenic 274 benthic 272 host-associated 214 agriculture 209 high salinity 206 sediment 199 lotic 170 plant host 148 wetland 145 paludal 142 rhizosphere 141 subsurface 135 lacustrine 131 groundwater 131 spring 117 grassland 111 cropland 104 brackish water 88 medium salinity 88 sea floor 83 animal host 67 very high temperature 65 hot spring 65 stream 59 microaerobic 59 fluvial 53 hydrothermal vent 52 forest 48 very low temperature 43 littoral 38 permafrost 38 estuary 34 medium temperature 30 low temperature 30 mammalian host 30 contaminated 29 digestive tract 28 intestine 27 industrialized 27 human host 27 tundra 26 alkaline 22 stream bed 20 saline water 18 sludge 18 wastewater 18 skin 17 built environment 16 coral reef 14 mine 14 acidic 13 dairy product 13 food 13 high temperature 7 adult 7 elderly 6 very high salinity 6 arid 5 hospital 4 insect host 4 waste 4 mangrove 3 urban 3 phyllosphere 3 sewage 2 lake bed 2 salt marsh 2 plant litter 1 briny water 1 anaerobic 1 child 1 airways 1 infant 1