This dataset is the result of census exercises made by students in the framework of the General Ecology Course, at the Universite Libre de Bruxelles (ULB). The data includes both terrestrial and aquatic ecosystems data, taken on a yearly basis (by different batches of students), for which identifications are systematically checked by the supervisors. The field work focuses on regions of Belgium which are particularly contrasted from a geomorphological standpoint, but also from their conservation status, including Natura2000 sites.