TL;DRAbstract
Tilia americana, American basswood, is a species of tree found in mesic forests throughout eastern North America and the cloud forests of Mexico. Despite being common and widespread, little is known about basswood’s evolutionary and geographic history. In this study, the phylogeny and phylogeography of basswood were investigated using chloroplast DNA sequences, morphological measurements, and species distribution modeling. The North American basswoods were found to be a monophyletic group containing two distinct clades, one primarily in the United States and one primarily in Mexico. The majority of the genetic diversity resides within the United States, particularly in the southern Appalachian region. Diversity is reduced in the northern latitudes, a pattern consistent with post-glacial range expansion. Diversity is also low within Mexico. The most frequent haplotypes in Mexico appear to be closely related to populations in the southern Appalachians and Piedmont region, suggesting a U.
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Tilia americana, American basswood, is a species of tree found in mesic forests throughout eastern North America and the cloud forests of Mexico. Despite being common and widespread, little is known about basswood’s evolutionary and geographic history. In this study, the phylogeny and phylogeography of basswood were investigated using chloroplast DNA sequences, morphological measurements, and species distribution modeling. The North American basswoods were found to be a monophyletic group containing two distinct clades, one primarily in the United States and one primarily in Mexico. The majority of the genetic diversity resides within the United States, particularly in the southern Appalachian region. Diversity is reduced in the northern latitudes, a pattern consistent with post-glacial range expansion. Diversity is also low within Mexico. The most frequent haplotypes in Mexico appear to be closely related to populations in the southern Appalachians and Piedmont region, suggesting a U.
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