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Systematics Section / ASPT

Feild, Taylor [1], Bell, Charles [2].

New insights into the "Dark and Disturbed" hypothesis.

The "dark and disturbed" hypothesis (Feild et al., 2004) offers a re-appraisal of the ecology of the early angiosperms. This re-appraisal comes from ancestral state reconstructions using maximum parsimony. In this study we further explore this hypothesis by mapping ecological and physiological characters onto a phylogeny of extant basal angiosperms using maximum likelihood and Bayesian methods to reconstruct the ecology of their common ancestor. These statistical methods have advantages over maximum parsimony in that they take into consideration uncertainty in rates of evolution, divergence times, modes of speciation, and tree topology. We highlight some of the caveats of such analyses. In addition, we discuss evidence from the fossil record as it pertains to the hypothesis.

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1 - Tulane University, Department of Ecology and Evolutionary Biology, Dinwiddie 310, New Orleans, Louisiana, 70118-5698, USA
2 - Xavier University of Louisiana, Biology, 1 Drexel Drive, New Orleans, Louisiana, 70125, USA

maximum likelihood

Presentation Type: Oral Paper
Session: 38-4
Location: 400/Hilton
Date: Tuesday, August 16th, 2005
Time: 2:45 PM
Abstract ID:310

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