Recent Topics Posters
Baird, Kristen E. , McMullen, Conley K. , Weeks, Andrea .
Progress in phylogeographic study of Galapagos endemic Cordia (Boraginaceae).
SEVEN species of Cordia L. (Boraginaceae) are thought to inhabit the Galapagos Islands. As currently understood, four of these species are endemic (C. anderssonii, C. leucophlyctis, C. revoluta, C. scouleri), two are probably native (C. lutea, C. polycephala), and one is introduced (C. alliodora). The endemics and natives are thought to have originated in the western (Andean) region of South America and arrived in the archipelago via long-distance dispersal by birds. In habit, Galapagos members range from low-growing shrubs to small trees and occupy both arid lowlands and moist uplands. Difficulties arise when dealing with this genus in the archipelago because three of the four endemics are not readily distinguishable using available keys and descriptions. Our ongoing collaborative project uses a variety of characters (morphological, molecular, palynological, and reproductive) in preparing a much-needed taxonomic revision of these endemics. Ultimately, the project will provide Galapagos conservation officials with an updated nomenclature for the genus, a clear understanding of species limits and relationships, and reliable records of species distributions. Here we report our progress in using comparative DNA sequence analysis of the endemic species (49 accessions) to establish the number of Cordia lineages in the Galapagos and their distribution among the islands. Preliminary data from nuclear regions (ITS, waxy, and NIA-i3) are presented.
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1 - George Mason University, Department of Environmental Science and Policy MSN 5F2, 4400 University Drive, Fairfax, VA, 22030, USA
2 - James Madison University, Department of Biology, Msc 7801, Harrisonburg, Virginia, 22807, USA
3 - George Mason University, Department of Environmental Science and Policy 5F2, Fairfax, Virginia, 22030, USA
Presentation Type: Recent Topics Poster
Location: Auditorium/Bell Memorial Union
Date: Tuesday, August 1st, 2006
Time: 12:30 PM