Activities related to STM are mainly conducted in the research group "Gestion et valorisation des Eaux en Méditerranée" (GEM) in collaboration with the UMS CNRS 3514 Stella Mare. Computer simulation and scientific calculation activities are also carried out in support of this group by other researchers of the Unit. The GEM group aims to provide operational elements of expertise at island, national, international and especially Mediterranean level, through the implementation of diagnostics, prediction and solutions adapted to the sustainable management of water and associated natural resources. Our areas of expertise concern the continuum existing between continental surface and underground fresh water, coastal brackish water and marine water. The originality of our scientific strategy is based on the consideration of many environmental compartments: study of hydrology, phytoplankton and zooplankton communities, post-larvae, echinoderms, crustaceans, fish and parasites. A major focus is to understand the responses of marine, lagoon and aquatic ecosystems to global changes in order to optimize the management, restoration and enhancement of these resources. To this end, the following topics are addressed: Structure, dynamics, management and enhancement of marine and lagoon plant communities; Biodiversity and knowledge of Mediterranean post-larvae; Structure, dynamics and restoration of natural populations of fisheries interest. The team has expertise in population biology, biostatistics, functional ecology, ecophysiology, ecotoxicology, parasitology, zootechnics, geochemistry, isotope hydrology and hydrogeology.