Sytsma, Kenneth , Krug, Amelia .
A Biogeographical and Phylogenetic Analysis of Dipterocarpaceae: Do They Honor the Wallace Line.
The family Dipterocarpaceae (Malvales) is pantropical in distribution, but the majority of species belong to the subfamily Dipterocarpoideae. The subfamily comprises large trees dominant in seasonal to everwet forests from India and Sri Lanka to West Malesia. The biogeography of most species of these Asian dipterocarps correlates directly with the Wallace Line. However, some genera including Anisoptera, Hopea,Vatica, Shorea, and Dipterocarpus have crossed east over the line into Australian islands. This distribution pattern raises an important question: have dipterocarps crossed the Wallace Line subsequent to the final collision of the Sunda and Sahul Plates approximately 5-10 mya; or, alternatively, did they cross earlier and over far larger oceanic barriers? To address this question, a phylogenetic analysis was undertaken using cpDNA sequences from Dipterocarpoideae, other subfamilies, and outgroup families in Malvales. Fossil dates within Dipterocarpaceae and the Malvales were utilized in BEAST to infer the minimal ages of dispersal events eastward across the Wallace Line. The fossil-calibrated phylogeny was then evaluated in light of the time sequence of geological events to provide a more robust scenario of dipterocarp evolution and dispersal in the Wallace Line region.
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1 - University Of Wisconsin, Department Of Botany, Birge Hall, 430 Lincoln Drive, Madison, WI, 53706, USA
2 - Department of Botany, University of Wisconsin, Madison, WI, 53706, USA
Presentation Type: Poster:Posters for Topics
Location: Battelle South/Convention Center
Date: Monday, July 9th, 2012
Time: 5:30 PM