Hearn, David , Wolf, Ben , McGinty, Michael , Wen, Jun .
Phylogeography of Cyphostemma (Vitaceae).
Cyphostemma is the second largest genus (ca. 150 spp.) in the grape family (Vitaceae) with unique growth form diversity. Unlike its closest relatives that are all herbaceous vines and lianas, members of Cyphostemma experienced an explosion in growth habit diversity, exhibiting herbs, trees, shrubs, various succulent forms, and vines as well. Our long term goalis to understand the underlying evolutionary mechanisms responsible for this diversity. We provide a first phylogenetic analysis of the genus, with a focuson Madagascan taxa, using 5 loci (trnL-trnF, rps16, atbP-rbcL, rbcL, GAI1) to reconstruct the evolutionary history of 109 samples using a Bayesian inference of phylogeny. We then use this evolutionary history to examine different modelsof the geographic origins and dispersal from that origin to the current biogeography. Our phylogenetic analyses support a monophyletic Cyphostemma, with a subclade from Madagascar and Mauritius. Cyphostemmais embedded in a larger clade that includes the genera Cayratia (paraphyletic) and Tetrastigma (monphyletic). These analyses support the evolutionary origins of Cyphostemma in Southern or Eastern Africa with subsequent dispersal to and diversification in Madagascar, Mauritius (one species), and Thailand (one species). Our future work will focuson the timing of divergence to examine the relationship between character diversification, geographic expansion, and climate.
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2 - Towson University, Department of Biological Sciences, 8000 York Road, Baltimore, MD, 21252, USA
3 - Balwin-Wallace College, Biology and Geology, 275 Eastland Road, Berea, OH , 44017
Presentation Type: Oral Paper:Papers for Topics
Location: Franklin B/Hyatt
Date: Monday, July 9th, 2012
Time: 10:30 AM