Morris, Ashley B. , Graham, Catherine H. , Soltis, Douglas E. , Soltis, Pamela S. .
Using Monmonier’s algorithm and ecological niche modeling to evaluate phylogeographic inferences in Fagus grandifolia.
As a young field at the boundary between systematics and population genetics, phylogeography has been largely dependent on qualitative data assessment, with inferences being primarily based on visual observation of patterns. In recent years, more emphasis has been placed on the need for a quantitative approach to such data, in an attempt to provide some level of statistical confidence for perceived patterns. The implementation of ecological niche modeling (ENM) as a tool for predicting paleodistributions has provided an independent means by which to compare phylogeographic data with traditional biogeographic hypotheses regarding full glacial refugia. However, particularly in plant studies, few researchers have yet to employ these techniques. Here we evaluate the strength of previously published phylogeographic inferences in an eastern North American (ENA) tree species, Fagus grandifolia, using a novel combination of methodologies, including ENM and Monmonier’s algorithm. Four chloroplast DNA regions were used to survey genetic structure among 232 individuals across 147 sampling sites. Two well-supported clades were resolved through Bayesian analyses, each of which corresponded with hypothesized post-glacial migration corridors. The results of ENM based on paleoclimatic data were consistent with traditional hypotheses of Coastal Plain refugia, while results from the implementation of Monmonier’s algorithm provide support for the idea of refugia near or north of the last glacial maximum. Potential reasons for incongruence between analytical methods and future uses of these approaches in phylogeographic studies will be discussed.
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1 - University of South Alabama, Department of Biology, Life Sciences Building 124, Mobile, AL, 36688, USA
2 - State University of New York, Department of Ecology & Evolution, 650 Life Science Bldg, Stony Brook, New York, 11794, USA
3 - University of Florida, Department of Botany and Zoology, PO Box 118526, Gainesville, FL, 32611, USA
4 - University of Florida, Florida Museum of Natural History, PO Box 117800, Gainesville, FL, 32611-7800, USA
ecological niche modeling
eastern North America.
Presentation Type: Oral Paper:Papers for Topics
Location: Cottonwood B/Snowbird Center
Date: Monday, July 27th, 2009
Time: 3:00 PM