The first results of the paleolimnological part of this project suggest a strong relationship between historical changes in watershed land use and lacustrine ecosystem structure and function. The project proposal aims to test this hypothesis through the construction of hydrological models and intercalibration of these models with those based on detailed paleolimnological and sedimentological data. Two lake systems in the VIIIth region, one of which experienced drastic changes in land use strategies during the last century (L. Grande de San Pedro) and a control for other impact factors such as climate change and acidification. The hydrological models can then be used to predict the effect of future changes in watershed land use on lacustrine ecosystems.