Systematics Section / ASPT
Morris, Ashley B. , Bigger, Alexandra , Damji, Zera , Gitzendanner, Matthew A. , Soltis, Douglas E. , Soltis, Pamela S. .
Comparative phylogeography of eastern North American trees.
Single species phylogeographic studies, while providing an interesting story about the individual species, say very little about the biogeographic history of a region. Comparative studies of multiple, unrelated species with different life history strategies are the key to gaining a more complete record of regional history. The purpose of this research is to trace the biogeographic history of eastern North America, using long-lived tree species as study organisms. The choice to include only trees in this study was based on the fact that many trees in the eastern United States have well-preserved and well-documented fossil pollen records, whereas most herbaceous species do not. The fossil information provides some background data on which many hypotheses have been based. Here we present haplotype networks based on non-coding chloroplast sequence data for North American Fagus,Hamamelis, Illicium, and Liquidambar to test alternative hypotheses regarding the timing of the disjunction between the United States and Mexico and potential Pleistocene refugia. Preliminary data indicate no substantial genetic differentiation between U.S. and Mexican individuals of Liquidambar and Fagus, while there are such differences between U.S. and Mexican individuals of Illicium. Patterns observed within and among species are discussed.
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Ashley B. Morris on the web
1 - University of Florida, Department of Botany, 220 Bartram Hall, P.O. Box 118526, Gainesville, Florida, 32611-8526, USA
2 - University of Florida, Florida Museum of Natatural History, Department Of Natatural Science, Gainesville, Florida, 32611-7800, USA
Presentation Type: Oral Paper
Date: Tuesday, August 16th, 2005
Time: 10:30 AM