Relier les changements dans la recharge des eaux souterraines à la structure des communautés et au fonctionnement des écosystèmes d'eau douce

Climate change impacts groundwater recharge, which in turn may affect groundwater-surface water interactions. These changes might subsequently affect hydrological patterns of freshwater ecosystems, their biodiversity and functioning. Assessing groundwater recharge at a regional scale is a challenge, mainly due to the generally limited knowledge about infiltration processes, interaction with surface water or aquifers, available data and human activities impacts. A gridded water budget approach has been developed to compute groundwater recharge by precipitation in the Adour-Garonne Basin (France) and evaluate the impact of climate change on it. Using these first estimates, we will aim at understanding how it could impact biodiversity structure, ecosystem functioning and water/sediment quality using fresh waters as model ecosystems. Indeed, these systems can be highly dependent of groundwater and faces multiple human-induced perturbations. Here, we will aim to discuss how changes in ground water recharge, by interacting with eutrophication and biological invasions, might impact these freshwater ecosystems.