Riley, Lynn , McGlaughlin, Mitchell E , Helenurm, Kaius .
Phylogeography of two California Channel Island endemic Eriogonum (Polygonaceae).
The California Channel Islands harbor many endemic animals and plants, including several endemic species and subspecies within the genus Eriogonum (Polygonaceae). Although a few Channel Island phylogeographic studies have been published, patterns of colonization and divergence have not been inferred for any Channel Island plant taxon. The current study uses DNA sequence divergence to infer colonization and gene flow patterns within and between two Channel Island endemic Eriogonum species. Data are presented from the monotypic endemic species Eriogonum arborescens and the three subspecies of the endemic species E. giganteum. Six populations of Eriogonum arborescens and fourteen populations of E. giganteum were sampled from throughout the archipelago. One to three individuals from each population were sequenced for three chloroplast regions (ca. 2K total aligned basepairs), the ribosomal internal transcribed spacer (ITS) and one low copy nuclear gene region (LFY). Distinct patterns of DNA diversity and divergence were detected between different taxa, and within taxa on different islands. Additionally, discordant phylogenetic signals were recovered with the chloroplast and nuclear sequence data. Implications for colonization patterns and inter-island gene flow are discussed.
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1 - University Of South Dakota, Biology, 414 E. Clark Street, Vermillion, SD, 57069, USA
2 - University of Northern Colorado, Biology, 501 20th St, Greeley, CO, 80639, USA
3 - University Of South Dakota, Department Of Biology, Vermillion, SD, 57069, USA
low copy sequence
Presentation Type: Oral Paper:Papers for Sections
Location: Lindell C/Chase Park Plaza
Date: Wednesday, July 13th, 2011
Time: 8:15 AM