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Systematics Section / ASPT

Porter, J. Mark [1], Anderson, Theodore [1].

Reticulate history of Ipomopsis (Polemoniaceae): a Bayesian approach to network analysis..

The genus Ipomopsis (Polemoniaceae) has been the subject of substantial study of introgression and hybridization. Analyses of nrITS, nuclear gpd, and cp trnL-F sequences from Ipomopsis display significant conflict, including nodes with statistical support. Some of the patterns of conflict are consistent with expectations from previous hypotheses of hybridization. Such evidence of reticulation undermines the application of bifurcating tree models of diversification. There are a variety of methods available to analyze DNA data under a network model of diversification. Many of these methods reduce sequence data to distances, e.g., split decomposition. Methods that employ optimality criteria, such as likelihood, often are very slow. We propose an approach to network analysis that takes advantage of Bayesian methods and the MCMC algorithm. Posterior probabilities can be used as a criterion for identifying bipartitions and/or weighting of bipartitions to be incorporated in network construction.


1 - Rancho Santa Ana Botanical Garden, 1500 North College Avenue, Claremont, California, 91711-3157, USA

Keywords:
Polemoniaceae
phylogeny reconstruction
Bayesian phylogenetic inference
network analysis
hybridization
Ipomopsis.

Presentation Type: Paper
Session: 45-1
Location: Cottonwood B (Snowbird Center)
Date: Wednesday, August 4th, 2004
Time: 8:15 AM
Abstract ID:889


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