Recent Topics Posters
Robart, Bruce , Frank, Thomas .
Asia to North America and Back Again: Phylogeography of Pedicularis (Orobanchaceae).
Dispersal-vicariance analysis (DIVA) was used to reconstruct ancestral biogeographic patterns among North American Pedicularis. Reconstructions were performed on a MP tree generated from ITS sequences. Results reveal two separate origins in Asia. The one origin indicates dispersal to eastern North America followed by vicariance that separated the eastern North American plus Asian ancestor into an early disjunct pattern, with later dispersal of the Asian ancestor into the Rocky Mountains. This ancestor then fragmented into distinct Rocky Mountain and Asian plus polar distribution patterns. The Rocky Mountain distribution shows further dispersal into the Cascade Range, Sierra Nevada Mountains, and one redistribution back to Asia via dispersal from the Rocky Mountains. The Asian/polar distribution reveals two dispersal events: 1) an additional dispersal into eastern North America but via the southern Rocky Mountains and 2) another separate dispersal into the northern Rocky Mountains. The second Asian origin shows an early dispersal followed by vicariance to the northern Rocky Mountains. From here two separate dispersal events occurred, one to the southern Rocky Mountains and the other to the Cascade Range. Further vicariance and dispersal events of the Cascade Range generated 1) distribution into the Sierra Nevada, California coastal ranges, and southern Rocky Mountains and 2) widespread distribution across northern North America, including Siberia, with subsequent dispersal and vicariance fragmenting several endemic species, which includes the disjunct eastern species, P. furbishiae. Origin of North American Pedicularis in Asia implies that migration occurred from west to east across the Bering Land Bridge, but these results also indicate that later migrations can proceed in the opposite direction.
Log in to add this item to your schedule
1 - University of Pittsburgh, Johnstown, Biology, 450 Schoolhouse Road, Johnstown, PA, 15904
2 - 931 East Avenue, Johnstown, Pennsylvania, 15905, USA
Presentation Type: Recent Topics Poster
Location: Salon C, D & E - Gov Ballroom/Hilton
Date: Tuesday, August 16th, 2005
Time: 12:30 PM