1988 Volume 49 Issue 3 Pages 157-166
Water quality and the flora of epiphytic diatoms on reed stems in 50 eutrophic irrigation reservoirs distributed in the lowland near Nagoya City were investigated. There are some reservoirs with yellowish brown colored water characterized by low pH, low Ca ion concentration and high COD/BOD ratio. The UV spectrum of the colored water resembled to that of the fulvic acid. As for the species composition of the epiphytic diatom community, acidophilus or sphagnophilous Eunotia and Pinnularia were abundant. Based on the water quality and the diatom flora, it can be concluded that the reservoirs with yellowish brown water distributed in the lowland belong to dystrophic lake type.
