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Parasites in hybridizing communities: the red queen again?
Justyna Wolinska1, Curtis M Lively, Piet Spaak
1Indiana University, Department of Biology, 1001 East Third Street, Bloomington, IN 47405, USA. jwolinsk@indiana.edu
Trends in Parasitology
|February 26, 2008
Summary
Parasites may not statically affect hybrid infections. Coevolutionary dynamics, driven by frequency-dependent selection, may better explain infection patterns in hybrids compared to their progenitor species.
Area of Science:
- Evolutionary biology
- Parasitology
- Genetics
Background:
- Hybridization and its impact on host-parasite interactions are key research areas.
- Previous studies compared infection levels in hybrids and progenitor species, yielding mixed results.
- Static genetic models of host resistance have limitations in explaining observed infection dynamics.
Purpose of the Study:
- To investigate whether parasites favor or penalize hybridization.
- To explore the role of coevolutionary dynamics in host-parasite interactions involving hybrids.
- To propose an alternative explanation for infection patterns in hybrids.
Main Methods:
- Review of empirical data on infection levels in hybrids and progenitor species over two decades.
- Analysis of static genetic scenarios of host resistance.
- Consideration of dynamic coevolutionary models, specifically frequency-dependent selection.
Main Results:
- Four static infection scenarios exist, with varying levels of hybrid resistance compared to parental species.
- Empirical data has supported all four static scenarios to some extent.
- Limited sampling and experimental designs may have overlooked crucial dynamic processes.
Conclusions:
- Static genetic perspectives may be insufficient to explain infection patterns in hybrids.
- Coevolutionary oscillations, driven by frequency-dependent selection, offer a more robust explanation.
- Future research should incorporate dynamic models to understand host-parasite evolution in hybrid systems.
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