Mondragón, Ariadna , Richardson, James , Dick, Christopher W. , Swenson, Ulf , Bartish, Igor , Madriñán, Santiago .
Relative effects of the formation of the Panama landbridge and Andean orogeny on the diversification of Neotropical Sapotaceae.
The Miocene uplift of the Northern Andes and the closure of the Isthmus of Panama in the Plicoene were two geological events that are thought to have had a major effect on the diversification of the Neotropical Flora. Lowland tropical lineages would be expected to have diverged as the Andes uplifted and as they migrated across the Isthmus of Panama after this landbridge formed. Sapotaceae are a family of predominantly lowland forest trees that are a good model to test the effects of these geological phenomena. We present a dated molecular phylogeny that includes c. 10% of the 400 Neotropical species in the subfamily Chrysophylloideae. The timing of trans-cis Andean splits are consistent with Andean uplift but many trans isthmian splits are older than the age of the formation of the Panama isthmus landbridge indicating that Sapotaceae dispersed overwater across the landbridge on multiple occasions (although a full sampling would be necessary to confirm this). The Andes are therefore a greater barrier to dispersal than the ocean. In addition we show that Chrysophyllum argenteum, a species that is found on either side of the Andes is exceptionally old and has lineages that split as the Andes rose in the Neogene.
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Laboratorio de Botánica y Sistemática
James Richardson @ Royal Botanic Garden Edinburgh
Sapotaceae Resource Centre
1 - Universidad de los Andes, Departamento de Ciencias Biológicas, Laboratorio de Botánica y Sistemática, Apartado Aéreo 4976, Bogotá, DC, Colombia
2 - Royal Botanical Garden Edinburgh, 20a Inverleith Row, Edinburgh, EH3 5LR, United Kingdom
3 - University of Michigan, Ecology and Evolutionary Biology, 2011 Kraus Natural Science Bldg., 830 N. University, Ann Arbor, MI, 48109-1048, USA
4 - Swedish Museum of Natural History, Department of Phanerogamic Botany, P.O. Box 50007, Stockholm, SE-104 05, Sweden
5 - Academy of Sciences, Institute of Botany, Pruhonice, CZ-25243, Czech Republic
Presentation Type: Oral Paper:Papers for Topics
Location: 551A/Convention Center
Date: Monday, August 2nd, 2010
Time: 10:00 AM