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The implications of coevolutionary dynamics to host-parasite interactions
Alex Best1, Andy White, Mike Boots
1Department of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, England, United Kingdom. a.best@shef.ac.uk
The American Naturalist
|April 21, 2009
Summary
Highly virulent parasites can evolve through host-parasite coevolutionary dynamics. Host evolution significantly impacts parasite virulence, with small changes in host resistance driving large shifts in parasite virulence.
Area of Science:
- Evolutionary biology
- Theoretical ecology
- Infectious disease dynamics
Background:
- Infectious diseases necessitate understanding host and parasite evolution.
- Existing theories often focus on unidirectional evolution (host OR parasite).
- Ecological dynamics are crucial but often overlooked in coevolutionary models.
Purpose of the Study:
- To present a comprehensive coevolutionary model of host-parasite systems.
- To investigate the feedback between ecological dynamics and coevolution.
- To determine conditions under which highly virulent parasites may evolve.
Main Methods:
- Developed a fully coevolutionary model incorporating ecological dynamics.
- Analyzed the sensitivity of parasite evolution to host evolution.
- Examined the impact of varying mutation rates on virulence.
Main Results:
- Coevolutionary processes can lead to the evolution of highly virulent parasites.
- Parasite evolution is highly sensitive to host evolution; virulence fluctuates with mutation rates.
- Host evolutionary branching drives increased parasite virulence.
- Small changes in host resistance cause substantial shifts in parasite virulence.
Conclusions:
- Host-parasite coevolutionary dynamics are critical for understanding virulence.
- Virulence is not static and can increase significantly in response to host evolution.
- Ecological feedbacks are essential for accurate coevolutionary predictions.
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