Transit towards floristic homogenization on oceanic islands in the south-eastern Pacific: comparing pre-European and current floras

摘要: Aim  To quantify the occurrence of processes homogenization or differentiation in vascular flora six oceanic islands. Location  Six islands south-eastern Pacific drawn from Desventuradas Archipelago, Easter Island and Juan Fernandez Archipelago. Methods  Using published floristic studies, we determined composition each island at two different stages: (1) pre-European colonization (2) current flora. We compared changes number shared plants similarity among for stage. Results  The plant species doubled 263 to 531 currently. Only three native became extinct, four natives were translocated 271 introduced outside. frequency by more is higher post-European floras than prior European contact, level between increased slightly. Main conclusions  Considering low naturalization rate alien plants, small extinctions meagre increase similarity, these are undergoing a slow process homogenization.