MICROBIALLY-RELATED REDOX CHANGES IN A SUBTROPICAL LAKE .1. IN-SITU MONITORING OF THE ANNUAL REDOX CYCLE

Using a recently developed in situ multiprobe the redox development in the water column of warm-monomictic Lake Kinneret was investigated du ring three annual cycles. During the time when sulfide release into th e meta- and hypolimnion is initiated, our measurements show a linear r elationship, close to the thermodynamic function, between the platinum electrode potential and the amount of sulfide produced by the sulfate reducing bacteria. A change of this relationship during summer strati fication coincides with the bloom of the phototrophic sulfur bacterium Chlorobium phaeobacteroides.