Abundance and occurrence of benthic diatom community along the Sangker River catchment (Tonle Sap Basin). (a) Relative abundance of diatom genera in percentage (only genera with a relative abundance greater than 1% are shown), (b) Occurrence of diatom genera as a percentage (only diatom genera with a frequency of occurrence greater than 50% are shown). Seventy-eight (78) diatom genera were recorded from the nineteen (19) monitoring sites within the river catchment.