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Related Experiment Video

Updated: May 26, 2026

Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter

Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter

Published on: March 12, 2013

Reconciling the omnivory-stability debate.

Gabriel Gellner¹, Kevin McCann

¹University of Guelph, Guelph, Ontario N1G 2W1, Canada. ggellner@uoguelph.ca

The American Naturalist

|December 17, 2011

Summary

Omnivory, where organisms consume multiple trophic levels, can destabilize food webs when interactions are strong. However, weak to intermediate omnivory often enhances stability in ecological communities.

Area of Science:

Ecology
Theoretical Ecology
Food Web Dynamics

Background:

The role of omnivory in maintaining food web stability is a long-standing question in ecology.
Previous studies have yielded conflicting results regarding omnivory's impact on ecosystem stability.
Understanding omnivory's influence is crucial for predicting community resilience.

Purpose of the Study:

To investigate the precise mechanisms by which omnivory affects the stability of linear food chains.
To develop a novel theoretical framework for analyzing omnivorous food webs.
To reconcile existing theories on omnivory and food web stability.

Main Methods:

Development of a community matrix approach analogous to bifurcation analysis.
Analysis of six distinct cases for omnivorous interaction strengths in linear food chains.

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Last Updated: May 26, 2026

Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter

Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter

Published on: March 12, 2013

Fatty Acid 13C Isotopologue Profiling Provides Insight into Trophic Carbon Transfer and Lipid Metabolism of Invertebrate Consumers

Fatty Acid ¹³C Isotopologue Profiling Provides Insight into Trophic Carbon Transfer and Lipid Metabolism of Invertebrate Consumers

Published on: April 17, 2018

Revisiting and re-parameterizing classical models (Pimm and Lawton) to assess omnivory effects.

Main Results:

Strong omnivory is consistently destabilizing to food chains.
Weak to intermediate omnivory predominantly stabilizes food webs.
Omnivory can exhibit occasional or intermittent destabilizing effects under specific conditions.

Conclusions:

The stability of omnivorous food chains is critically dependent on interaction strength.
Theoretical findings support the stabilizing role of weak omnivorous interactions.
Current empirical data on omnivory aligns with the developed theoretical framework.