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Updated: Mar 6, 2026
10:20
Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter
Published on: March 12, 2013
14.0K
Numerical and temporal relationships in a three-level food chain.
Bruce Peary Solomon1, S J McNaughton1
1Department of Biology, Syracuse University, 13210, Syracuse, N.Y., USA.
Oecologia
|March 18, 2017
Summary
Plant-insect interactions show that high herbivore and parasitoid densities benefit fruit production. Optimal moth survivorship occurs at intermediate densities, suggesting a stable food chain with refuges and parasitoid control.
Area of Science:
- Ecology
- Population Dynamics
- Plant-Insect Interactions
Background:
- Plant reproductive success is influenced by herbivory and parasitism.
- Understanding food chain dynamics is crucial for ecological stability.
Purpose of the Study:
- To examine densities of horsenettle (Solanum carolinense), its specific moth herbivore (Frumenta nundinella), and a parasitoid wasp (Scambus pterophori).
- To investigate the relationship between plant, herbivore, and parasitoid densities and their impact on population dynamics and plant reproductive success.
Main Methods:
- Field observations of natural populations.
- Analysis of herbivore and parasitoid densities in relation to fruit density.
- Assessment of temporal and spatial escape from herbivory.
Main Results:
- Both herbivore and parasitoid densities positively correlated with fruit density.
- Moth larval density showed a linear increase, while parasitoid density exhibited a parabolic increase.
- Optimal moth survivorship was observed at intermediate moth densities.
- No temporal escape from herbivory was detected; however, spatial escape was observed in isolated populations.
Conclusions:
- Plant reproductive success is negatively impacted by herbivory, regardless of parasitism.
- The presence of an herbivore refuge and parasitoid activity at high densities are expected to stabilize the food chain.
- Ecological interactions, including herbivory and parasitism, play a key role in regulating population dynamics and plant fitness.
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