Deep Time Colloquium
Feng, Chunmiao , Thomas, David , Xiang, Jenny Qiu-Yun .
Phylogenetic relationships and biogeography of Alangiaceae – integrating evidence from DNA sequences, morphology, and fossils.
ALANGIACEAE is a small lineage sister to Cornaceae in the basal asterids clade, Cornales. The family consists of only Alangium with approximately 23 species distributed in tropics and subtropics of the Old World. However, abundant fossil records of Alangium were reported from the early Tertiary of temperate North America, Europe, and Asia. Thus the genus serves as a good model for testing historical migration of plants between temperate and tropical floras. We reconstructed the phylogeny of Alangium using data from DNA sequences, morphology and fossil evidence to evaluate the classification and test biogeographic hypothesis regarding the origin and migration of the genus. Preliminary phylogenetic analyses supported previously proposed four sections within Alangium with sect. Conostigma from SE Asian and southern Pacific islands branching off first, followed by sect. Alangium from SE Asia. The widespread sect. Marlea is sister to sect. Rhytidandra restricted to the southern Pacific islands. Various approaches for phylogenetic analyses including fossils will be explored. Biogeographic hypotheses inferred from DIVA and the new maximum likelihood method that integrates temporal information on lineage divergence and geographic dispersal barriers will be compared. Evolution of important morphological characters will be examined using parsimony and maximum likelihood methods.
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1 - North Carolina State University, Department of Botany, Campus Box 7612, Raleigh, North Carolina, 27695-7612, USA
Presentation Type: Symposium or Colloquium Presentation
Location: 206/Performing Arts Center
Date: Tuesday, August 1st, 2006
Time: 10:45 AM