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Bacterioplankton biomass and production during destratification in a monomictic eutrophic bay of a tropical lagoon

Vertical profiles of bacterial biomass (AODC method), production of biomass (thymidine method) and total ETS (Electron Transport System) activity were recorded on 14 dates during the destratification process in the monomictic eutrophic Bietri Bay (Ebrie Lagoon, Ivory Coast). Bacterial biomass and production were both very high, indicating the importance of heterotrophic processes in this system. Interpretation of ETS data suggests that bacteria or 'bacteria-associated organisms' are responsible for most of the oxygen consumed in the water column.'Integrated bacterial production of biomass represented ca 80 % of carbon produced by primary producers, thus showing that autotrophic production does not meet heterotrophic requirements of bacteria. Destratification appears to be of less importance than suggested by the physical and chemical characteristics, resulting in a decrease of bacterial biomass and production by a factor of 2 in the epilimnion. In the hypolimnion, the 'anaerobic community' characterized by low specific incorporation rates (3.4 X mol cell-i h-') and high mean cellular volume (0.203 pm3) during stratification is replaced by an 'aerobic community' with higher specific thymidine incorporation rates (6.6 X lo-" mol cell-' h-') and lower mean cellular volumes (0.151 pm3). Interpretation of bacterial production of biomass in these newly oxygenated layers demonstrates that oxygen requirements in the aphotic zone are roughly equivalent to autotrophic production of oxygen in the euphotic zone, thus showing that oxygenation of the entire water column is necessarily transient and explaining the return to anoxic conditions before the establishment of a new density stratification.