全球植物多样性分布背后的生物地理过程

Barnabas H. Daru1*, Cornelius O. Nichodemus2, L. Francisco Henao- Diaz3 The uneven global distribution of plant diversity remains a fundamental question in biogeography. Using dated phylogenies of >300,000 plant species and ancestral biogeographical stochastic mapping, we show that in situ speciation is the predominant process underlying extant plant diversity and accounts for 78% of biogeographic events across realms. The Neotropic contributed 37% of in situ speciation, likely owing to its role as a center of species diversification. Dispersal between realms was less frequent (16% of events) but facilitated floristic exchanges, especially in the Eastern Hemisphere. Extinction was least frequent but more pronounced in East asia. …