Lea, Payton , Willyard, Ann .
The taxonomic status of ponderosa pine: How do the Pacific Race populations and the pines of the Santa Cruz sand hills fit?
Due to the distinct characteristics of Pinus ponderosa Lawson & C.Lawson (Pinaceae) found in western California, Oregon, and Washington, the name P. benthamiana Hartw. (or P. ponderosa var. benthamiana (Hartw.) Vasey) has been used for the "Pacific Race" of ponderosa pines west of the Sierra Nevada and Cascade crests. In contrast, benthamiana might be restricted to putatively unique populations growing on sand hills within the redwood forest region near Santa Cruz, California. We tested whether molecular and/or ecological differences between the Pacific Race and inland (i.e. P. ponderosa var. ponderosa) populations and between the sand hill and Pacific Race populations can distinguish separate taxa. We used PCR to amplify cpSSRs and nSSRs from about 25 individuals from each of 10 populations to test for genetic intermediates and to visualize relatedness. Haplotype analysis of cpSSRs and Principal Components Analysis of cpSSRs and nSSRs were used to identify clusters of genetically similar populations. We also used ecological niche models based on biologically meaningful climate data to test the ecological distinctiveness of the habitats occupied by putative taxa. We discuss how these independent criteria can be used to support species delimitation decisions.
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1 - Hendrix College, Biology, 1600 Washington Ave, Conway, AR, 72032, USA
2 - Hendrix College, Biology Dept, 1600 Washington Ave, Conway, AR, 72032, USA
ecological niche models.
Presentation Type: Poster:Posters for Sections
Location: Battelle South/Convention Center
Date: Monday, July 9th, 2012
Time: 5:30 PM