aquatic 68 marine 44 benthic 33 sediment 28 terrestrial 26 lentic 24 wetland 14 paludal 14 high salinity 14 fresh water 12 low salinity 11 soil 10 host-associated 9 saline water 9 pelagic 9 lacustrine 8 medium salinity 6 brackish water 6 estuary 6 plant host 6 rhizosphere 6 contaminated 5 sea floor 5 very low temperature 4 spring 3 animal host 3 lotic 3 hydrothermal vent 3 coral reef 3 very high temperature 3 very high salinity 2 medium temperature 2 groundwater 1 subsurface 1