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Parasitoid avoidance of intraguild predation drives enemy complementarity in a multi-trophic ecological network
Andrew B Hennessy1, Riley M Anderson1, Nora Mitchell2
1Department of Biology, Wesleyan University, Middletown, Connecticut, USA.
Ecology
|January 22, 2025
Summary
Predator diversity impacts consumption efficiency. In forest ecosystems, birds and parasitoids exhibit enemy complementarity, where birds reduce parasitoid predation risk, enhancing overall predation efficiency.
Area of Science:
- Ecology
- Evolutionary Ecology
- Biological Control
Background:
- Consumer diversity influences consumption efficiency, a key ecological concept.
- Intraguild predation (predators consuming each other) can reduce predation efficiency, while enemy complementarity can increase it.
- Parasitoids face intraguild predation from generalist predators, leading to debate on whether interference or complementarity dominates their interactions.
Purpose of the Study:
- To investigate the interplay between intraguild predation and enemy complementarity in a forest food web.
- To determine if predator diversity enhances or reduces predation efficiency in a natural system.
- To examine the specific interactions between parasitoids, birds, and ants in regulating herbivorous caterpillar populations.
Main Methods:
- Field experiments were conducted in a forest community.
- The study involved multiple species of trees, herbivorous caterpillars, parasitoids, ants, and birds.
- Parasitism rates and predator-prey interactions were analyzed to assess interference and complementarity effects.
Main Results:
- No interference effects were observed between the studied predator groups.
- Clear evidence of enemy complementarity was found between parasitoids and birds, but not with ants.
- Parasitism rates by parasitoids were negatively associated with bird predation risk, indicating birds indirectly benefit parasitoids.
Conclusions:
- Avoidance of intraguild predation by parasitoids may drive enemy complementarity.
- Enemy complementarity, driven by predator avoidance, can enhance overall predation efficiency in ecological communities.
- These findings help explain complex patterns in terrestrial food webs involving vertebrates, arthropods, and plants.
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