New analytical results for the speciation times in neutral models
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| Description: |
Gernhard, T (Munchen)
Tuesday 04 September 2007, 15:50-16:10 PLGw01 - Current Challenges and Problems in Phylogenetics |
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| Created: | 2007-09-13 17:21 | ||
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| Collection: | Phylogenetics | ||
| Publisher: | Isaac Newton Institute | ||
| Copyright: | Gernhard, T | ||
| Language: | eng (English) | ||
| Distribution: |
World
(downloadable)
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| Explicit content: | No | ||
| Aspect Ratio: | 4:3 | ||
| Screencast: | No | ||
| Bumper: | UCS Default | ||
| Trailer: | UCS Default | ||
| Abstract: | Did a reconstructed phylogeny evolve under a neutral model? We provide an analytical way – opposed to the common simulation approach – for comparing the speciation times of a reconstructed tree with the dates proposed by the neutral models, e.g. via lineages-through-time plots. Further, if dates are missing in a reconstructed tree which evolved under a neutral model, we provide the time of the speciation events. These methods, which make use of the rank function on a phylogenetic tree, can also be applied for calculating analytically the loss in biodiversity when some species become extinct. The neutral models considered in this work are the Yule model and a generalization which includes extinction as well, the critical branching process (CBP) model, recently introduced by D. Aldous and L. Popovic. Trees under these neutral models are conditioned on having $n$ extant species today which is crucial for data analysis. |
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