Finch, Kristen , Meyers, Stephen , Willyard, Ann .
How distinct are the geographically isolated coastal populations of ponderosa pines in the Willamette Valley of Oregon and Fort Lewis, Washington?
Incomplete lineage sorting and the potential for inter-specific hybridization in the genus Pinus make it challenging to determine recent biogeography and perhaps even to delimit some species. We studied isolated natural stands of ponderosa pines in the Willamette Valley of Oregon and on the Fort Lewis military base near the Puget Sound in Washington. Several researchers have reported that one or both of these pine populations have unique characteristics such as the timing of spring growth, wood density, and biochemistry. These populations are geographically distant from the ponderosa pines of coastal California (P. benthamiana Hartw.), but grow in a very different climate than the nearer populations of ponderosa in eastern Oregon and eastern Washington (P. ponderosa, North Plateau Race). We sampled 14 populations (ca. 350 individuals) from the Willamette Valley, the Puget Sound, P. benthamiana in California, and the North Plateau Race from eastern Washington, western Idaho, and central Oregon. Multi-locus nuclear and chloroplast genotypes from microsatellite loci (SSRs) provided useful length variation in regions of the genome that harbor SSRs because individuals of the same species have diverse numbers of SSR repeats. We analyzed these data in several frameworks to reveal relationships within and among populations. Considering the large geographic distance between these populations and their apparent sister populations, we tested whether the ponderosa populations from the Willamette Valley and the Puget Sound are more closely related to each other than they are to other populations and whether each population shares a more recent history with P. benthamiana or with P. ponderosa.
Log in to add this item to your schedule
1 - Hendrix College, Biology Dept, 1600 Washington Ave, Conway, AR, 72032, USA
2 - Oregon State University, Botany and Plant Pathology, Cordley 2082, Corvallis, OR, 97331, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Lindell A/Chase Park Plaza
Date: Wednesday, July 13th, 2011
Time: 3:00 PM