Une carte de France de continuités écologiques bocagères d’importance nationale pour le projet TVB

Abstract

Maintaining a dense ecological network for different habitats is a challenge to guarantee persistence of ecological processes at national scale. As cultural landscape favourable for biodiversity, bocage represents an important stake in terms of connectivity. In the context of the “ Trame verte et bleue” project and the definition of its guidelines, we carried out a survey to propose a map of bocage ecological continuities of national significance. The process is based on a cartographic crossing between three data sources : two existing maps of land use and crop diversity, and an indicative map of ecological quality. The latter was produced representing specific richness of 11 bocage-dependent species in a grid. When the three criteria were visually satisfied in the manual cartographic crossing, structural and functional continuity was identified. The obtained map highlights 9 main indicative continuities. The results were confronted to local data and expertise to assess map relevance. The main objective of this work is to facilitate national coherence of regional ecological networks.