title: As old as the mountains: the radiations of the Ericaceae.
abstract: Mountains are often more species-rich than lowlands. This could be the result of migration from lowlands to mountains, of a greater survival rate in mountains, or of a higher diversification rate in mountains. We investigated this question in the globally distributed family Ericaceae, which includes c. 4426 species ranging from sea level to > 5000 m. We predict that the interaction of low specific leaf area (SLA) and montane habitats is correlated with increased diversification rates. A molecular phylogeny of Ericaceae based on rbcL and matK sequence data was built and dated with 18 fossil calibrations and divergence time estimates. We identified radiations using bamm and correlates of diversification rate changes using binary-state speciation and extinction (BiSSE) and multiple-state speciation and extinction (MuSSE) analyses. Analyses revealed six largely montane radiations. Lineages in mountains diversified faster than nonmountain lineages (higher speciation rate, but no difference in extinction rate), and lineages with low SLA diversified faster than high-SLA lineages. Further, habitat and trait had a positive interactive effect on diversification. Our results suggest that the species richness in mountains is the result of increased speciation rather than reduced extinction or increased immigration. Increased speciation in Ericaceae was facilitated by low SLA.
authors.affiliation: Institute of Systematic Botany of the University of Zurich, Zollikerstrasse 107, 8008, Zurich, Switzerland.
authors.forename: Orlando
authors.initials: O
authors.lastname: Schwery
authors.affiliation: Institute of Systematic Botany of the University of Zurich, Zollikerstrasse 107, 8008, Zurich, Switzerland.
authors.forename: Renske E
authors.initials: RE
authors.lastname: Onstein
authors.affiliation: Institute of Systematic Botany of the University of Zurich, Zollikerstrasse 107, 8008, Zurich, Switzerland.
authors.forename: Yanis
authors.initials: Y
authors.lastname: Bouchenak-Khelladi
authors.affiliation: Institute of Systematic Botany of the University of Zurich, Zollikerstrasse 107, 8008, Zurich, Switzerland.
authors.forename: Yaowu
authors.initials: Y
authors.lastname: Xing
authors.affiliation: Institute of Systematic Botany of the University of Zurich, Zollikerstrasse 107, 8008, Zurich, Switzerland.|Cottage Science, Carterton, New Zealand.
authors.forename: Richard J
authors.initials: RJ
authors.lastname: Carter
authors.affiliation: Institute of Systematic Botany of the University of Zurich, Zollikerstrasse 107, 8008, Zurich, Switzerland.
authors.forename: Hans Peter
authors.initials: HP
authors.lastname: Linder
mesh_terms: D000531:Altitude; D044822:Biodiversity; D005075:Biological Evolution; D017753:Ecosystem; D029791:Ericaceae / Q000235:genetics*; D053476:Extinction, Biological; D049810:Genetic Speciation; D010641:Phenotype; D010802:Phylogeny; D063148:Plant Dispersal; D018515:Plant Leaves
keywords: Ericaceae; evolutionary radiation; extinction; mountain; plant functional traits; speciation; specific leaf area