Etude physico-chimique et microbiologique du Lac de Tunis (Partie Nord)

Abstract

A l yr study (Oct 1965 to Sept 1966) was conducted on physico-chemical aspects (Sppt, T{degree}, O Sub(2) pH and H Sub(2)S) and microbiological factors (total heterotrophic flora and sulfate-reducting flora) of the North Lake basin, Tunid Lake. A close relationship between the relative rates of weather conditions and physicochemical factors is shown to influence the production of reducing bacterial blooms and putrefaction within the lake. Bacterial blooms are additionally influenced by the quality and amount of organic matter. The author has emphasized the interrelated factors of weather nutrient factors and hydrology as the trilogy in the production of H Sub(2)S-producting blooms of bacteria. Production of H Sub(2)S marks the point where 'red tide' is noticed, followed by mass microorganisms in the lake.