Abstract
The Etang de Berre, located near Marseille, is the largest French Mediterranean lagoon. Studies before and after commencement of operation of a hydroelectric plant have followed changes in marine benthic communities in response to erratic freshwater inflows diverted from the Durance River. After several unstable years, the marine benthic communities were replaced by a euryhaline and eurythermal assemblage and large areas of the lagoon were devoid of macrobenthos due to oxygen depletion. Analysis of the dynamics of mollusc populations shows the importance of fluctuations in freshwater discharges and resulting salinity variation, sedimentation, dissolved oxygen depletion and sediment pollutants.
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