Systematics Section / ASPT
Bain, John F , Golden, J.L. .
Chloroplast DNA haplotype diversity patterns in autogamous Packera pauciflora..
Packera pauciflora is one of two wide ranging autogamous species in a genus where most species are not only allogamous but prone to hybridization. The species' distribution is centered in the northern Rocky mountains but it also occurs at high elevations in California and in the Gulf of St. Lawrence region of eastern Canada. Chloroplast DNA haplotype variation was examined in populations from northwestern North America and California. Haplotype diversity values within populations were generally low, especially compared to other Packera species. Most populations were monomorphic and most, but not all, populations contained haplotypes that are similar to each other and to other coastal and northern Packera populations from different species. California populations contain haplotypes not found in the northern populations. The lack of hybridization resulting from the autogamous breeding system is thought to have contributed to the reduced levels of haplotype diversity present in this species when compared with other widespread Packera species like P. cana. The high level of interpopulational variation is thought to be the result of a combination of drift and possibly some limited ancient hybridization.
1 - University of Lethbridge, Biological Sciences, 4401 University Drive, Lethbridge, Alberta, T1K 3M4, Canada
Presentation Type: Poster
Location: Special Event Center (Cliff Lodge)
Date: Tuesday, August 3rd, 2004
Time: 12:30 PM