Wu, Carrie A. .
Genetic structure of an Ipomopsis hybrid zone influenced by habitat- and pollinator-mediated selection.
Members of the Ipomopsis aggregata species complex in the phlox family (Polemoniaceae) often hybridize when they occur in sympatry, and thus have been extensively studied to examine processes involved in plant speciation. Until recently, however, there has been a paucity of genetic markers available for the system. I developed 12 microsatellite loci in I. aggregata that are also polymorphic in closely related I. tenuituba, producing an average of eight alleles per locus in test populations of 12 individuals per species. These markers were subsequently used to characterize the genetic structure of a natural hybrid zone between I. aggregata and I. tenuituba in Poverty Gulch, Colorado. Prior work in this system suggests that contemporary population structure has been influenced by a combination fo pollinator behavior and habitat-mediated selection, but elucidating the fine-scale genetic composition of the hybrid zone has proven difficult to date with other nuclear genetic markers. Several of these markers also successfully amplified in other Ipomopsis species and more distant members of the Polemoniaceae, suggesting they should prove useful for a broad range of evolutionary studies in this widely distributed system.
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1 - Duke University, Department of Biology, Box 90338, Durham, NC, 27708, USA
Presentation Type: Poster:Posters for Topics
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM