Long-distance dispersal shaped the diversity of tribe Dorstenieae (Moraceae)

BioRxiv : the Preprint Server for Biology
Qian ZhangHerve Sauquet


Aim: The Neotropics have the highest terrestrial biodiversity on earth. Investigating the relationships between the floras of the Neotropics and other tropical areas is critical to understanding the origin and evolution of this mega-diverse region. Tribe Dorstenieae (Moraceae) has a pantropical distribution and almost equal number of species on both sides of the Atlantic. In this study, we investigate the relationship between the African and Neotropical floras using Dorstenieae (15 genera, 156 species, Moraceae) as a model clade. Location: the Neotropics and Africa. Methods: We used a targeted enrichment strategy with herbarium samples and a nuclear bait set to assemble a data set of 102 genes sampled from 83 (53%) species and fifteen genera (100%) of Dorstenieae, and five outgroup species. Phylogenetic relationships were reconstructed with maximum likelihood and coalescent approaches. This phylogeny was dated with a Bayesian relaxed clock model and four fossil calibrations. The biogeographic history of the group was then reconstructed with several dispersal-extinction-cladogenesis models (incl. DEC and DEC+J). Results: The crown-group ages of Dorstenieae and Dorstenia were estimated in the Cretaceous (65.8-79.8 Ma) and the Pal...Continue Reading

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