Robart, Bruce , Gore, Rahul , Policicchio, Ben .
Phylogeny and Biogeography of Pedicularis (Orobanchaceae) in North America.
Pedicularis is an arctic/alpine plant genus consisting of 40 species in North America out of an estimated 600-800 species worldwide. ITS and matK DNA regions have been sequenced from 32 North American species. We included an additional 124 ITS sequences obtained from GenBank in our analysis. Utilizing PAUP, MrBayes, BEAST, sDIVA, and associated programs, we have inferred the evolutionary history, biogeography, and chronology of Pedicularis in North America relative to Pedicularis species in Asia. Two distinct North American clades were resolved, each with an ancestral area in Asia. Our molecular clock estimation for entry of both clades into North America overlaps the Miocene (14-10 Myr) epoch, a time when the Bering Land Bridge was open for migration of boreal taxa. In one clade, subsequent divergence into North America also includes divergence into the Japanese archipelago. Once in North America, this clade displays a divergence route that converges into the southern Rocky Mountains by two different pathways, one by an earlier direct passage from the northern Rocky Mountains and the other by way of the Southern Cascade and Sierra Nevada ranges. The Furbish Lousewort (P. furbishiae) is an eastern North American relic disjunct member of this clade. The second clade, on the other hand, shows widespread divergence across most North American mountain ranges and into eastern North America via multiple routes. This clade also includes three European species in which North America is inferred as the ancestral area.
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1 - University of Pittsburgh at Johnstown, Biology, 450 Schoolhouse Road, Johnstown, PA, 15904
Bering Land Bridge
Presentation Type: Poster:Posters for Sections
Location: Khorassan Ballroom/Chase Park Plaza
Date: Monday, July 11th, 2011
Time: 5:30 PM