Grady, Ben R. , Sytsma, Kenneth J. .
Systematics of the 'capitate clade' in Eriogonum (Polygonaceae) relating to evolutionary patterns of narrow soil endemism.
Patterns of narrow endemism in plants relating to soils have long intrigued field botanists and evolutionary biologists, alike. The exceptionally diverse genus Eriogonum (Polygonaceae) provides an ideal opportunity to investigate these patterns of edaphic endemism from a phylogenetic perspective. A first step in this study is to identify a moderately-sized lineage containing numerous edaphic endemics. Sequence data from rapidly-evolving chloroplast and nuclear regions are used to infer evolutionary relationships of members of the ‘capitate clade’ in Eriogonum, a group roughly corresponding to sect. Capitata (Reveal 2005, FNA 5: 274-286). Some exemplary narrow soil endemics in this clade include Eriogonum soredium on limestone and Eriogonum diatomaceum on diatomaceous clay. A complex evolutionary history is emerging within this group. An initial synopsis of patterns of edaphic endemism in the ‘capitate clade’ is presented. Individual soils are characterized and grouped by combining data from numerous physical and chemical properties from field-collected soil samples. These edaphic groups are then placed in a phylogenetic context by Bayesian trait modeling, highlighting the evolutionary patterns of narrow soil endemism. We expect closely related species in the ‘capitate clade’ to occur on soils with similar properties.
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1 - University of Wisconsin-Madison, Botany, 430 Lincoln Drive, 258 Birge Hall, Madison, WI, 53706, United States
2 - University of Wisconsin-Madison, Botany, 430 Lincoln Drive, Madison, WI, 53706, United States
Presentation Type: Oral Paper:Papers for BSA Sections
Location: Magpie A/Cliff Lodge - Level B
Date: Tuesday, July 28th, 2009
Time: 9:00 AM