Disharmonie insulaire de la bryoflore macaronésienne

Island disharmony reflects the biased community composition of island biota as compared to continental sources owing to filtering effects (dispersal, adaptation, biotic interactions) followed by in-situ diversification. Bryophytes exhibit efficient long-distance dispersal capacities, ‘all-purpose’ genotypes, low levels of endemism and limited biotic interactions. Their community structure and composition are therefore expected to display little differences with continental sources. To test this hypothesis, we first need to identify which continental floras are and have been the most likely sources for the Macaronesian flora. Based on analyses of floristic similarities, we compute phylogeographic coalescence analyses of non-endemic species and phylogenies and ancestral area reconstruction analyses of endemic species