Estimating Divergence Dates Some practical problems: - Can be a steep learning curve - New methods outstrip supply of software - Suitable datasets hard to come by Some rewards: - Gain a better understanding for phylogenetic methodology - Add a new dimension to your analyses - Address some really cool questions!
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Estimating Divergence Dates
Some practical problems:
- Can be a steep learning curve
- New methods outstrip supply of software
- Suitable datasets hard to come by
Some rewards:
- Gain a better understanding for phylogenetic methodology
- Add a new dimension to your analyses
- Address some really cool questions!
Paleocene
Cretaceous
LateCretaceous
EarlyCretaceousLateJurassic
157ma ±
146ma ±
97ma ±
65ma ±
Modern Birds
‘Ratites’and
tinamousNeognathae
Neornithes
Archaeopteryx
Paleognathae
The Radiation of Modern Birds
Feduccia, 1995Tertiary ‘big bang’
Did modern birds survive the K-T boundary?
Modern Birds
Fossil EvidenceBird
Modern birds much older- Gondwanic origin?
Molecular data
Modern Birds
Bird
KT65 ma
Modern Birds
Fossil EvidenceBird
KT65 ma
What about their parasites?
Youngerthan their
hosts?
Parasitic lice
Molecular dataLouse
Modern Birds
Fossil EvidenceBird
KT65 ma
What about their parasites?
As old astheir hosts?
Parasitic lice
Molecular dataLouse
Modern Birds
Fossil EvidenceBird
KT65 ma
What about their parasites?
Older thantheir hosts?
Parasitic lice
Molecular dataLouse
Did modern birds & their lice survive the K-T boundary?Did modern birds & their lice survive the K-T boundary?Did dinosaurs have lice?