The correspondence of salinity ranges between among halobion system, ecological code and environmental indicators. a shows salinity ranges of halobion system (Kolbe 1927). Polyhalobous, mesohalobous and oligohalobous correspond to marine, brackish-water and freshwater respectively b shows salinity ranges of ecological code (Vos and De Wolf 1988) c shows salinity ranges of ten diatom assemblages in environmental indicators (Kosugi 1988) (modified from Chiba and Sawai 2014).