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Systematics Section / ASPT

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

Unraveling the evolutionary history of Pacific Cyrtandra J.R. & G. Forster (Gesneriaceae): phylogeny and phylogeography of a species-rich genus.

Cyrtandra J.R. & G. Forster (Gesneriaceae) is a 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. Ongoing fieldwork is being conducted to collect species from all of the major island chains in the Pacific, particularly, the Samoan-Fijian region and the Marquesas Islands, and eventually other centers of diversity. Preliminary analyses of nuclear ribosomal spacer, chloroplast spacer, and nuclear low copy gene family sequences suggest a more dynamic exchange of species among the South Pacific islands than has been previously suggested. A phylogeographic hypothesis is here presented including potential west to east migrations followed by likely back (east to west) migrations. The relative strengths and weaknesses of this hypothesis are examined using phylogenetic signal from multiple DNA sequence data sets.


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

Keywords:
Cyrtandra
Gesneriaceae
ITS
ETS
nuclear genes
Phylogeny
Phylogeography
chloroplast genes.

Presentation Type: Oral Paper
Session: 48-10
Location: Salon G - Austin Grand Ballroom/Hilton
Date: Wednesday, August 17th, 2005
Time: 3:30 PM
Abstract ID:315


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