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Abstract Detail


Systematics Section / ASPT

Kelchner, Scot A. [1].

The numberless tree: using a robust topology for phylogeny estimation.

PHYLOGENETIC inference is linked indelibly to expectations about character evolution (a model). If the expectations are incorrect, systematic error in the topology or other estimated parameters can occur and tree resolution will represent uncorrected bias and not evolutionary history. Systematic error can affect even genome-scale phylogenetic analyses, which sometimes show high bootstrap support for different trees under different models. In recognition of this fact, a strategy can be employed that assesses the stability of tree topology under alternative models of character evolution, a property referred to as robustness of the topology. A robust topology gives us different, and perhaps more useful, information than bootstrap values and can support a phylogeny estimation even though it is a ‘numberless’ tree (i.e., lacking bootstrap, jackknife, or decay values). Benefits and limitations of robust topologies will be introduced and an example will be given for inferring the phylogeny of Myoporaceae (= Scrophulariaceae: Myoporeae).[c.e.:srb]


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1 - Idaho State University, Department of Biological Sciences, Campus Box 8007, Pocatello, Idaho, 83209-8007, USA

Keywords:
phylogenetic methods
phylogenetic signal
systematic error
robustness
support measures
model misspecification.

Presentation Type: Oral Paper:Papers for Sections
Session: 24-3
Location: Auditorium/Laxson
Date: Monday, July 31st, 2006
Time: 2:15 PM
Abstract ID:477


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