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Abstract Detail


Systematics Section / ASPT

Clark, John R. [1], Roalson, Eric [1].

A big genus in a big ocean: phylogeny, historical biogeography, and morphological observations of Pacific Cyrtandra (Gesneriaceae).

CYRTANDRA J.R. & G. Forster (Gesneriaceae) is a large and diverse genus that spans nearly a quarter of the Earth’s circumference. As many as 600-1000 species have been estimated, although exact species counts are nebulous due to sparse collecting throughout its range. Centers of diversity include the Indo-Malayan region, Hawai’i, and the South Pacific. Fieldwork has been conducted in several major archipelagos in the Pacific, particularly, Hawai’i, Samoa, Fiji, and the Marquesas Islands. Our current analysis of nuclear ribosomal spacer, chloroplast spacer gene sequences, and partial analysis of newly characterized nuclear gene sequences, suggests a dynamic exchange of species among the South Pacific islands with west to east and subsequent east to west dispersal events. Historical biogeographic pattern reconstructions using Fitch Parsimony Optimization and the novel application of Posterior Mapping (using Bayesian inference) are compared. Additionally, notes on lineage synapomorphies are presented.


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1 - Washington State University, School of Biological Sciences, Po Box 644236, Pullman, Washington, 99164-4236, USA

Keywords:
Posterior Mapping
phylogeography
islands biogeography
Lamiales
Cyrtandroideae
Cyrtandra
Gesneriaceae
.

Presentation Type: Poster:Posters for Sections
Session: 48-195
Location: Auditorium/Bell Memorial Union
Date: Tuesday, August 1st, 2006
Time: 12:30 PM
Abstract ID:329


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