Systematics/Phytogeography / Taxonomie/ Section
Kelso, Sylvia , Beardsley, Paul , Weitemier, Kevin .
Phylogenetic perspectives on speciation and biogeography of Primula sect. Parryi, endemic to western North America.
Primula sect. Parryi is comprised of eight taxa endemic to western North America. This section exemplifies regional phytogeographic patterns with Asian and European affinities via relatives in Primula subg. Auriculastrum, a few widespread species and localized endemics. Primula parryi occurs from Idaho and Montana to northern Arizona and P. rusbyi occurs in the Madrean sky island archipelago mountains of Arizona, New Mexico and the Mexican Sierra Madre. Narrowly distributed members include Primula angustifolia is endemic to the southern Rocky Mountains from Colorado to n. New Mexico, and the Primula cusickiana complex, composed of P. capillaris (Ruby Mts, Nevada) and P. cusickiana with 4 varieties each narrowly endemic in regions of Idaho, Oregon, Utah, Nevada. Our study utilized sequences from cpDNA, nuclear ITS, ETS regions, and AFLP with PCO-MC analysis to examine the hypothesis that P. parryi evolved from an early basal split off an ancestral Asian lineage and that other taxa represent later allopatric and ecological divergence facilitated by climatic change and range fragmentation. Monophyly of all of the major taxonomic groups is strongly supported in all perspectives with no evidence of reticulate evolution between P. parryi and any of the other taxa. The Primula cusickiana complex shows intergrading morphology and the least genetic divergence; sister relationships within the clade vary according to different perspectives. We conclude it represents recent allopatry and ecological niche conservatism has contributed to diversification. Climatic scenarios, limited potential for migration, small populations, and reproductive restrictions inherent in heterostylous species suggest reasons for conservation concern.
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1 - Colorado College, Biology Department, 14 E. Cache La Poudre, Colorado Springs, Colorado, 80903, USA
2 - Biological Sciences Curriculum Study, 5415 Mark Dabling Blvd, Colorado Springs, CO, 80918, U.S.A.
3 - Portland State University, Biology, PO Box 751, Portland, OR, 97212, U
Presentation Type: Poster:Posters for Sections
Location: Ball Room & Party Room/SUB
Date: Monday, July 28th, 2008
Time: 12:30 PM