Rebelred project: mission aboard the Thalia Ifremer-Genavir

Mission rebelred 300px

In a context of climate change, the Loire River is experiencing periods of increasingly intense low water levels. As a consequence, anoxic episodes in the Loire estuary continue despite the decrease in phosphate inputs observed in recent decades.

The hypothesis of this project is the importance of the muddy sediment as a reservoir stock of phosphorus which, when remobilized in the water, favours algal development and ultimately oxygen depletion when the latter is degraded.

Within the framework of the Rebelred project led by Edouard Metzger, lecturer at the University of Angers, several campaigns of sediment sampling in the Loire estuary will be carried out.

Last February, on board the Ifremer vessel Thalia, our colleagues carried out a large number of samples using coring machines with the aim of evaluating the reactivity of these flood inputs and their influence on the mobility of metals and nutrients that are factors in primary production and oxygen consumption by organisms living in the water and sediment.

A second mission to the estuary is already scheduled for next summer. To be continued...