Presence in Mediterranean hotspots and floral symmetry affect speciation and extinction rates in Proteaceae

hotspots, Proteaceae, speciation rates. Summary! The Proteaceae is a large angiosperm family displaying the common pattern of uneven dis-tribution of species among genera. Previous studies have shown that this disparity is a result of variation in diversification rates across lineages, but the reasons for this variation are still unclear. Here, we tested the impact of floral symmetry and occurrence in Mediterranean cli-mate regions on speciation and extinction rates in the Proteaceae.! A rate shift analysis was conducted on dated genus-level phylogenetic trees of the Protea-ceae. Character-dependent analyses were used to test for differences in diversification rates between actinomorphic and zygomorphic lineages and between lineages located within or outside Mediterranean climate regions.! The rate shift analysis identified 5–10 major diversification rate shifts in the Proteaceae tree. The character-dependent analyses showed that speciation rates, extinction rates and net diversification rates of the Proteaceae were significantly higher for lineages occurring in Medi-terranean hotspots. Higher speciation and extinction rates were also detected for zygomor-phic species, but net diversification rates appeared to be similar in actinomorphic and zygomorphic Proteaceae.! Presence in Mediterranean hotspots favors Proteaceae diversification. In contrast with observations at the scale of angiosperms, floral symmetry is not a trait that strongly influences their evolutionary success