The primary production of algae (Pr) 717.56 J and their respiration (Ra) 154.60 J were highest in the estuary. The greatest respiration of bacteria (Rb) 45.96 J was in the reservoir. The total oxygen respiration (RO) 1036.78 J and the respiration of the remaining organisms (Rr) 1000.82 J g-1 C 24 h-1 were greatest in the stream. The values of algae (Ba) and bacteria (Bb) biomass, and Rb, Ra and Rb/Bb increased, and those of Rr and RO decreased on the stream - reservoir line.