Importance et caractéristiques des taxons cyrno-continentaux, et analyse de leur absence hors de Corse

Abstract

Abstract Jeanmonod, D. (2020). Importance and characteristics of the Cyrno-continental taxa, and analysis of their absence outside Corsica. Candollea 75: 291–310. In French, English and French abstracts. Corsica contains a flora present on the European continent but absent from all the other large Mediterranean islands (Balearic Islands, Cyprus, Crete, Sardinia and Sicily). The study analyzes all the taxa of this flora called here Cyrno-continental and represented by 258 taxa (12 % of the native flora). Its characteristics (biological, biogeographical and chorological types, vegetation belts and habitats) are analyzed here and appear to be very different from those of the total native flora. This flora directly depends on the geographical characteristics of Corsica distinct from those of the other islands (latitude, reliefs, temperate vegetation belts in altitude) because 59.8 % of these taxa find their limits of distribution in Corsica. Some of them have found a postglacial refuge in Corsica, others have been able to establish themselves thanks to the great wealth of its habitats, notably humid. Others have limited distribution areas that have not allowed them to colonize other islands. Expansion capabilities, environmental change and chance also play a role in some cases.