Evolutionary history of rosids in Yunnan angiosperms

Combining data on the distribution and phylogenetic relationships of species of rosids in Yunnan angiosperms, we explored how taxonomic composition (including species, endemic species, and threatened species) and phylogenetic diversity varied across different geographic regions. Integrating the distribution of natural protected areas with taxonomic and phylogenetic composition data, we also identified key areas for biodiversity conservation. As expected, species richness was well correlated with phylogenetic diversity and taxonomic richness of endemic and threatened species among geographic regions. Southern and northwestern Yunnan contained the highest species richness and phylogenetic diversity. Using null model analyses, the standardized effect size of phylogenetic diversity was much lower than expected based on species richness of Yunnan. We suggest that southern, southeastern, and northwestern Yunnan should be a focus for biodiversity conservation as these areas may help maximize the protection of the evolutionary history and potential of Yunnan angiosperms.