Secondary succession in the Zicavo region of Corsica (Mediterranean islandClimate effect.

The secondary succession was often studied in Mediterranean area though mor e rarely in Corsica. The aim of this article is to study the joint effect o f the land abandonment and the mesoclimatic variations between valleys, whi ch will enable us to outline proposals for a space management of protected area and for conservation of biodiversity in Corsica mountains. Sites crite ria and pedological criteria were taken into account on each plot. The anal ysis of "combined" effect of dynamic stage and valley was carried out by a "conditional" Factorial Correspondence Analysis (FCA) (inter and intra-clas ses of the 199 plots and 192 species) in the three sites. The secondary suc cession is often accompanied by a reduction in the number of species presen t strictly in a valley.