aquatic 76 lotic 68 spring 68 hot spring 43 benthic 43 sediment 36 very high temperature 35 low salinity 27 fresh water 27 sea floor 25 hydrothermal vent 25 marine 25 medium temperature 5 high temperature 3 lentic 2 lacustrine 2 low temperature 2 very high salinity 2 alkaline 1 terrestrial 1 briny water 1 soil 1