Scott L Nuismer 0 What is coevolution Thus I can understand how a flower and a bee might slowly become either simultaneously or one after the other modified and adapted to each other in the most perfect manner by the continued preservation of all the individuals which present ID: 490299
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Slide1
Integrating coevolution into the tree of life
Scott L. Nuismer
0
Slide2
What is coevolution?
"
Thus I can understand how a flower and a bee might slowly become, either simultaneously or one after the other, modified and adapted to each other in the most perfect manner, by the continued preservation of all the individuals which presented slight deviations of structure mutually
favourable
to each other."
— Charles Darwin, The Origin of Species
Coevolution:
Reciprocal evolutionary change in interacting species
(Janzen, 1980)
Species 1
Species 2Slide3
The importance of coevolution
Much of what we know about coevolution comes from mathematical modelsSlide4
A key assumption of coevolutionary theorySlide5
A key assumption of comparative methodsSlide6
The current state of affairs
Coevolutionary theory ignores phylogeny
Phylogenetic comparative methods ignore coevolutionSlide7
This raises two important questions
Our goal is to use a mathematical model to answer these questions
Do coevolution and phylogeny interact to shape contemporary trait values?
Question 1:
Question 2:
Can we predict contemporary rates of interaction?Slide8
Merging coevolution and evolutionary history
Species 1
Species 2
+Slide9
First time interval(no coevolution)
Second time interval(2-way coevolution)
Third time interval(3-way coevolution
)A general modeling approach
Our approach will be agnostic with respect to the process of speciationSlide10
How do traits mediate interactions?
Model 1: Phenotype Differences
B
est suited for interactions that depend on interference competition
How do traits mediate interactionsSlide11
How do traits mediate interactions?
Model 2: Phenotype Matching
B
est suited for interactions that depend on exploitation of shared resources
]
How do traits mediate interactionsSlide12
Predicting trait coevolution
Random encounters among individuals
Gaussian trait distributions
Classical quantitative genetics
Individual fitness
Slide13
Coevolutionary dynamics on a star phylogeny
How do traits evolve?
How do traits mediate interactions
Phenotype differences
Phenotype matching
Slide14
Integrating evolutionary
history:
Phenotype differences
Best suited for interactions that depend on interference competition
How do traits mediate interactionsSlide15
Integrating evolutionary history
0
Before speciation
After speciation
First interval:Slide16
0
Second interval:
Before speciation
After speciation
Integrating evolutionary historySlide17
0
This result can be easily generalized for any phylogeny
Integrating evolutionary history
Third interval:
Slide18
Coevolution and phylogeny do not interactSlide19
Phylogeny explains phenotypic similaritySlide20
Coevolution explains expected trait valuesSlide21
Expected outcome?Expected asymmetry?
How do traits evolve?
How do traits mediate interactions
Contemporary interactions can be predictedSlide22
Integrating evolutionary
history:
Phenotype matching
Best suited for interactions that depend on exploitation of shared resources
]
How do traits mediate interactionsSlide23
Integrating evolutionary history
0
Before speciation
After speciation
First interval:Slide24
0
Second interval:
Before speciation
After speciation
Integrating evolutionary historySlide25
0
Unfortunately, this result cannot easily be generalized
Integrating evolutionary history
Third interval:
Slide26
Coevolution and phylogeny interactSlide27
Phylogeny creates a template of phenotypic similaritySlide28
And coevolution modifies this template Slide29
Expected intensity of competition(with coevolution)
Expected
intensity of
competition
(without coevolution)
If we also have information about the historical strength of coevolution
Contemporary interactions can be predictedSlide30
Conclusion 1: Coevolution leaves a signatureSlide31
Conclusion 2: Interactions can be predicted
We can predict asymmetries
How do traits evolve?
We can predict intensitySlide32
Acknowledgements
Funding
National Science Foundation
Luke Harmon