Abstract

A massive bloom of halobacteria that had developed in the upper water layers of the Dead Sea in summer 1980 together with a bloom of the unicellular green algae Dunaliella was present for more than 2 years. Simulation experiments performed in ponds in the Dead Sea area showed that the availability of phosphate, the extent of dilution with less saline water, and the availability of a suitable carbon source determine the extent of the development of halobacteria in Dead Sea water.The number of particles resembling bacteria per milliliter of surface water decreased more than fivefold between November and December 1982, while the particulate protein decreased to below detection limits. This sudden decrease was correlated with a change in the physical structure of the water column from stratification to overturn.

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