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Predation on pollinators promotes coevolutionary divergence in plant-pollinator mutualisms
1Graduate School of Science, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan.
The American Naturalist
|January 28, 2014
Summary
Predators influencing plant-pollinator interactions can drive evolutionary diversification. Simulations show that predation on pollinators promotes reproductive isolation and speciation in plant-pollinator mutualisms.
Area of Science:
- Ecology
- Evolutionary Biology
- Theoretical Biology
Background:
- Coevolution between plants and pollinators is a key driver of mutualism diversification.
- Predators and competitors can significantly impact pollinator behavior and plant fitness.
- Current theories primarily focus on mutualistic interactions, neglecting antagonistic effects.
Purpose of the Study:
- To investigate whether predation on pollinators promotes coevolutionary diversification of plant-pollinator mutualisms.
- To evaluate the role of antagonistic interactions in shaping plant-pollinator systems.
- To explore the potential for predation to drive speciation in these mutualisms.
Main Methods:
- Developed an individual-based simulation model.
- Incorporated evolving blooming seasons for plants and active seasons for pollinators and predators.
- Compared simulation outcomes with and without predator presence.
Main Results:
- Without predators, plant-pollinator coevolution led to seasonal polymorphisms, not speciation.
- Introducing predators promoted the divergence of plant and pollinator populations into reproductively isolated groups.
- Predation increased the likelihood of plant-pollinator cospeciation and sympatric/allopatric divergence.
Conclusions:
- Predation on pollinators can be a significant factor promoting the diversification and speciation of plant-pollinator mutualisms.
- The interplay of antagonistic (predation) and mutualistic (pollination) interactions is crucial for diversification.
- This suggests that a broader range of ecological interactions should be considered in evolutionary diversification studies.
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