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Host-parasite 'Red Queen' dynamics archived in pond sediment
Ellen Decaestecker1, Sabrina Gaba, Joost A M Raeymaekers
1Laboratory of Aquatic Ecology and Evolutionary Biology, Katholieke Universiteit Leuven, Charles de Bériotstraat 32, 3000 Leuven, Belgium. ellen.decaestecker@kuleuven-kortrijk.be
Nature
|November 16, 2007
Summary
Host-parasite interactions drive coevolution, but long-term evidence is scarce. This study reveals rapid parasite adaptation to its host over years using ancient DNA from lake sediments, supporting ongoing Red Queen dynamics.
Area of Science:
- Evolutionary biology
- Ecology
- Parasitology
Background:
- Host-parasite interactions are crucial drivers of coevolutionary dynamics in natural populations.
- Empirical evidence for long-term Red Queen dynamics, characterized by reciprocal evolutionary change, remains limited.
- Lake sediments preserve dormant stages of hosts like Daphnia and their microparasites, offering a historical archive of genetic interactions.
Purpose of the Study:
- To reconstruct rapid coevolutionary dynamics between Daphnia and its microparasites in a natural setting.
- To provide empirical evidence for the temporal dynamics of host-parasite coevolution.
- To investigate the adaptive evolution of parasite infectivity and virulence over time.
Main Methods:
- Analysis of ancient DNA from dormant stages of Daphnia and microparasites preserved in lake sediments.
- Reconstruction of past gene pools to track evolutionary changes.
- Development and application of a coevolutionary model based on negative frequency-dependent selection.
Main Results:
- Demonstration of rapid parasite adaptation to its host within a few years.
- Confirmation of continuing host-parasite coevolution with stable parasite infectivity over time.
- Observation of a steady increase in parasite virulence, correlating with enhanced parasite fitness.
Conclusions:
- Lake sediment archives provide a powerful tool for studying rapid coevolutionary processes.
- The study provides strong empirical support for Red Queen dynamics in natural host-parasite systems.
- Parasite evolution exhibits increasing virulence over time, suggesting an ongoing evolutionary arms race.
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