Mais conteúdo relacionado Mais de Graeme Lloyd (20) Confidence intervals on node age estimates in vertebrate phylogeny1. Confidence intervals on node age
estimates in vertebrate phylogeny
Graeme T. Lloyd, Matt Friedman and
Mark A. Bell
5. “Ghost” diversity
Raw
Raw + “ghosts”
Raw + “ghosts”
Raw
(Weishampel et Jianu 2000) (Brusatte et al. 2011)
6. Extinction survival
Aphylogenetic survival:
1/3 = 33%
Phylogenetic survival:
4/6 = 67%
(Modesto et al. 2001)
13. Branch sharing solution
Share time with preceding
Traditional approach first
(non-zero length) branch
τ8
τ7 τ7
τ6 τ6
root age
τ5 τ5
(Ruta et al. 2006)
18. Hedman approach
Only 135 ‘unique’ nodes
(one third of 416 total)
(Lloyd et al. 2008)
19. Hedman approach
Only 135 ‘unique’ nodes
(one third of 416 total)
What about the
other two thirds?
(Lloyd et al. 2008)
27. Placental mammals
• Informal supertree
• 48 source trees
• 452 OTUs (cladistically
placed)
• Computation time: 6m 57s
29. Traditional vs. Molecular
Cretaceous
Paleogene
1:1 RSS
31269.3
Traditional approach
Cretaceous
Paleogene
Meredith et al. 2011
30. New approach vs. Molecular
Cretaceous
Paleogene
Modified Hedman approach 1:1 RSS 1:1 RSS
31269.3 12340.4
Cretaceous
Paleogene
Meredith et al. 2011
31. Approach comparison
Meredith
Traditional
et al.
approach
2011
Modified Reis
Hedman et al.
approach 2012
32. Approach comparison
Meredith
Traditional 1:1 RSS
et al.
approach 10433.7
2011
1:1 RSS
2210.1
Modified Reis
Hedman et al.
approach 2012
33. Approach comparison
Meredith
Traditional
et al.
approach
2011
1:1 RSS
1837.6
Modified Reis
1:1 RSS
Hedman et al.
1514.9
approach 2012
37. Conclusions
• Novel fossil-only tree dating approach
• Mimics molecular approach
• Helps close molecule-fossil gap
• Implications for a wide range of topics, e.g.:
• Phylogenetic diversity estimates
• Extinction/Survival %s
• Rates of evolution
• Trait models
• Better calibration distributions