Tuesday May 19, live on the Facebook page of the University of Nîmes, Julie Régis, doctoral student in biogeochemistry of aquatic environments at ED583, will present the subject of her thesis on the role of oxygen in the pollution of Mediterranean lagoons . She will also discuss the impact of the Covid-19 health crisis on her research work.
Partially separated from the sea by a continental cordon, the Mediterranean lagoons, better known as ponds, constitute areas with major socio-economic and ecological challenges on a regional scale. Human activity in their basins generates significant inputs of chemical pollutants which are mainly stored in sediments. In addition to degrading the quality of the water, these pollutants move through the water column, causing ecological and health risks since they affect certain edible species.
The oxygen concentration in the water column is the main factor in controlling this pollution. However, in recent decades, the lagoons have been impacted by phenomena of deoxygenation in the water column or hypoxic crisis (ex: malaïgue) more and more intense and frequent. Three Mediterranean lagoons (Berre, Prévost and Thau ponds) have been identified among the 479 coastal areas affected.
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