MSA - Systematics/Evolution
Hemenway, Joshua , Miller, Steven L. .
The phylogeography of a cryptic ectomyorrhizal species complex (Russula brevipes) in western North America.
Russula brevipes is one of the most widely dispersed and abundant late successional ectomycorrhizal fungi in western North America. Previous research has identified an intriguing complex of species and lineages centered around R. brevipes. Unfortunately the degree of reproductive isolation and geographic relationship among these lineages is unknown. Through a combination of phylogenetic, population genetic, and coalescent analysis of multi-locus sequence data the present study infers possible mechanisms responsible for the development of genetic lineages and their current distribution in western North America. Phylogenetic analysis identified the presence of multiple sympatrically distributed clades. These clades may represent cryptic phylogenetic species. The coalescent genealogy suggests a dynamic pattern of recent divergence for some lineages and more ancestral for others. Coalescent analysis and diversity estimates identify the Pacific coast as a likely ancestral location. The most parsimonious explanation involves the isolation of R. brevipes lineages in glacial refugia during the Pleistocene followed by rapid post glacial expansion into the current distribution. These findings suggest the importance of Pleistocene glacial cycles in the development of genetic structure and formation of reproductive barriers for ectomycorrhizal fungi.
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1 - University of Wyoming, Department of Botany, 3165, 1000 E. University Ave, Laramie, WY, 82071, USA
western North America
Presentation Type: Poster:Posters for Topics
Location: Event Tent/Cliff Lodge
Date: Tuesday, July 28th, 2009
Time: 5:30 PM