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Predator-Prey Interactions

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Related Experiment Video

Updated: Oct 14, 2025

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

Do predators keep prey healthy or make them sicker? A meta-analysis.

Robert L Richards^1,2, John M Drake^1,2, Vanessa O Ezenwa^1,2,3

¹Odum School of Ecology, University of Georgia, Athens, Georgia, USA.

Ecology Letters

|November 5, 2021

Summary

This summary is machine-generated.

Predators can impact prey parasite levels, either reducing or increasing them. The specific effect depends on predator traits and parasite type, showing predictable patterns in predator-prey-parasite interactions.

Keywords:

disease ecology healthy herds hypothesis meta-analysis parasite predator trophic interaction

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Area of Science:

Ecology
Parasitology
Evolutionary Biology

Background:

Ecological theory presents contrasting hypotheses on predator effects on prey parasitism: predators may reduce parasite burdens, or conversely, increase parasitism.
Understanding the net effect of predation on prey parasitism is crucial for ecological and conservation management.

Discussion:

A meta-analysis of 47 studies revealed that the overall impact of predation on prey parasitism is variable.
Key factors influencing this interaction include parasite type (parasites vs. parasitoids), the presence of consumptive effects (predator consuming prey), and whether the predator acts as a non-host spreader of parasites.

Key Insights:

Predation's effect on parasitism is not uniform; it significantly differs between parasites and parasitoids.
The presence of consumptive effects and the predator's role in parasite transmission are critical predictors of the parasite response.
The mechanistic basis of predator-prey interactions fundamentally shapes their influence on parasite dynamics.

Outlook:

Further research should explore the context-dependency of these interactions to refine predictive models.
Investigating specific predator-prey-parasite systems can elucidate the nuanced mechanisms at play.
These findings have implications for ecosystem health assessments and biological control strategies.