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Abstract Detail


Population Genetics

King, Matthew [1], Roalson, Eric [1].

Phylogeographic patterns and population genetic structure ofthe obligate coastal sedge, Carex macrocephala (Cyperaceae).

COMPARATIVE phylogeography has been a staple part of the evolutionary biologistís diet for the past decade. The Pacific Northwest (PNW) has not been neglected in this pursuit, however, one area of the PNW has been underrepresented. Although several studies have examined species inhabiting the coastal areas of the PNW, these studies have focused on species that are not restricted to the coast. Beaches along the northwest coast of North America have changed drastically since the Pleistocene due to changes in sea level and coverage of the Cordilleran Ice Sheet. In order to investigate the effects of these events on the evolutionary history of obligate coastal organisms we are examining the population genetic structure of Carex macrocephala (Cyperaceae), a sedge inhabiting the beaches of the northern Pacific Ocean. Using microsatellite loci, as well as the variable rpL16 spacer region (cpDNA), we are testing hypotheses of deep and shallow phylogeographic patterns. Although current methods in statistical phylogeography are vague, hypothesis testing is possible using coalescent simulation studies. Additionally, nested clade analyses of the rpL16 haplotype network may allow inferences of the evolutionary history of this sedge. The inclusion of C. macrocephalaís putative sister species, C. kobomugi which inhabits beaches on the Asian side of the Pacific Ocean, will aid in identifying historical biogeographic patterns.


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1 - Washington State University, School of Biological Sciences, Po Box 644236, Pullman, Washington, 99164-4236, USA

Keywords:
Cyperaceae
phylogeography
microsatellites
cpDNA
Pleistocene Glaciation.

Presentation Type: Oral Paper:Papers for Topics
Session: 10-3
Location: 120/SSKU
Date: Monday, July 31st, 2006
Time: 9:00 AM
Abstract ID:378


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