Mccarthy, Diane , Mason-Gamer, Roberta .
Phylogeography of the American basswood.
Many North American tree species are widely distributed and morphologically variable, but little is known about the processes underlying their distribution and variation. Fortunately, new techniques and sources of data allow us to investigate patterns within taxa that result from cryptic processes occurring over space and time. Tilia americana, the American basswood, is an excellent candidate for such a study. Its range covers the eastern half of North America from Canada to Mexico, and though it is now hypothesized to be a single species, it has been divided into as many as 15 species based on morphological variation. We sequenced the non-coding chloroplast DNA marker rpL32-trnL from 425 individuals in 75 natural populations of Tilia americana across its range and detected 25 haplotypes. While we failed to detect a concordance between haplotype and species sensu stricto, the distribution of haplotypes across the continent showed clear structure. Phylogeographic tools allow us to investigate the relationship between intraspecific genetic variation, geography, and history more precisely. Using a niche modeling approach, we conduct a phylogeographic study of American basswood in order to identify evolutionary and geographic sources of genetic structure and to assess the hypothesis that there is only one basswood species in North America.
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1 - University of Illinois at Chicago, Department of Biological Sciences, 845 W. Taylor, MC 066, Chicago, IL, 60607, USA
2 - University Of Illinois Hicago, DEPT. OF BIOLOGICAL SCIENCES (M/C.066), 845 W. TAYLOR ST., CHICAGO, IL, 60607, USA
Presentation Type: Oral Paper:Papers for Topics
Location: Lindell A/Chase Park Plaza
Date: Monday, July 11th, 2011
Time: 11:45 AM