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Biting into it: Occlusion and development force correlations and anticorrelations in dental characters
Liliana Davalos, Omar Warsi, Edward Li, Samuel Gochman, Nancy Simmons, Paul Velazco
Evolution Meetings, 22 June 2014
Key assumption: independencede Queiroz & Gatesy 2007
Compared to sequences
• Large representation of 0 dissimilarity
• Perhaps similarity arises from slower rates • Not from lack of
independence
Dávalos et al. 2014 Syst Biol
Bayesian analyses
Simulated matrices
Branch lengths & per character rate
Morphological matrix
Morphological phylogenies
Character states & ordering
Multiple characters on same toothExpected to result in correlations
OcclusionCorrelations, also anti-correlations from complementary patterns
Development forcing dependencyKangas et al. 2004
Dávalos et al. 2014 Syst Biol
Conclusion: rife with dependency
• All enrich for identical signal and anticorrelations
• Being on the same tooth
• Contributes more to identical signal
• Occlusion
• Being in dental series
• Complex pattern as distance in toothrow increases
Picture by Elizabeth Clare