Ruhfel, Brad R , Stevens, Peter , Davis, III, Charles C. .
Ancient Gondwanan vicariance and recent long distance dispersal in the pantropical clusiod clade (Malpighiales).
There are very few biogeographic studies of pantropical angiosperm clades. Moreover, very few tropical lineages have been shown to have a distribution due to Gondwanan vicariance. The clusioid clade (Malpighiales) has an ancient fossil record (90 Ma) and a pantropical distribution involving multiple neo- and paleotropical disjunctions. Using molecular divergence time estimation and ancestral area reconstruction we show that the early diversification of this clade possibly resulted from Western Gondwanan vicariance (i.e., the present day landmasses that include South America and Africa) and that the several other disjunctions have resulted from more recent dispersion. Included in this work is a re-evaluation of the phylogenetic position of Paleoclusia chevalieri, one of the oldest rosid macrofossils. This was necessary as this fossil is an important age constraint in our dating analyses. This re-evaluation also allows us to examine the placements of several clusioid genera that we were unable to obtain data for in our molecular phylogenetic study of the clade including: Lebrunia and Neotatea (Calophyllaceae); Lianthus (Hypericaceae); and Thysanostemon (Clusiaceae s.s.).
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Brad Ruhfel Homepage
1 - Harvard University, Department of Organismic and Evolutionary Biology, 22 Divinity Ave, Cambridge, MA, 02138, USA
2 - Missouri Botanical Garden, Po Box 299, St Louis, Missouri, 63166-0299, USA
divergence time estimates
Presentation Type: Oral Paper:Papers for Topics
Location: 551A/Convention Center
Date: Monday, August 2nd, 2010
Time: 9:00 AM