This research line investigates the effects of climate and global change on the biodiversity and functioning of aquatic ecosystems, especially riverine ones. Among the factors that most frequently impact Mediterranean ecosystems are flow alterations due to climatic and human causes, and the presence of pollutants, which affect the composition of microbial communities, as well as their distribution patterns and ecological functions. It is of great interest to understand how situations in which stressors co-occur in freshwater ecosystems may affect their conservation and functioning.