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Reservoir Zones: Microbial Production and Trophic State

ABSTRACT It is hypothesized that differences in the trophic states of three reservoir zones – riverine, transition, and lacustrine; i.e., change through space, can provide insights into the general eutrophication of the system; i.e., change through time. Differences in phyto-and bacterioplankton dynamics among the zones of reservoirs are explored. Microbial dynamics described for the eutrophication of natural lakes are taken as a null hypothesis against which reservoir zones are compared. Factors capable of affecting microbial community composition, production, metabolism and biomass accumulation are evaluated in the different zones. The lack of sufficient reservoir data on microbial processes, and particularly those of the bacterioplankton, prevents the shaping of comprehensive reservoir zone microbial models. The hypotheses posed provide a guide for much-needed reservoir research.