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Related Experiment Video

Updated: Mar 2, 2026

A Fish-feeding Laboratory Bioassay to Assess the Antipredatory Activity of Secondary Metabolites from the Tissues of Marine Organisms

A Fish-feeding Laboratory Bioassay to Assess the Antipredatory Activity of Secondary Metabolites from the Tissues of Marine Organisms

Published on: January 11, 2015

Quantifying predator dependence in the functional response of generalist predators.

Mark Novak¹, Christopher Wolf², Kyle E Coblentz¹

¹Department of Integrative Biology, Oregon State University, 3029 Cordley Hall, Corvallis, OR, 97331, USA.

Ecology Letters

|May 9, 2017

Summary

This study introduces a novel field approach to assess predator-prey dynamics, finding strong evidence for predator dependence not explained by simple ratio-dependent models. Results highlight prey-specific predator effects in generalist predators.

Keywords:

Beddington-DeAngelis functional response Nucella whelks consumer dependence food webs interaction modification interaction strengths mutual predator effects per capita attack rates prey preference

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Last Updated: Mar 2, 2026

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Area of Science:

Ecology
Theoretical Ecology
Marine Biology

Background:

Functional responses are crucial for understanding predator-prey dynamics and food web stability.
Prey-dependent models are simplest, but ratio-dependent models may better explain complex food web patterns.
Empirical evaluation of ratio dependence is rare, especially for generalist predators in natural settings.

Discussion:

Developed a novel field approach to simultaneously estimate prey-specific attack rates and predator-specific interference rates.
Applied this method to intertidal whelks and their prey, enabling evaluation with arbitrary species numbers.
Investigated predator dependence across manipulated and natural ranges of species abundances.

Key Insights:

Provided strong empirical evidence for predator dependence.
Demonstrated that the ratio-dependent model poorly describes observed dynamics.
Revealed that predator dependence can be prey-specific for generalist predators.

Outlook:

This approach allows for more robust empirical testing of functional response models.
Future research can explore predator-prey interactions in diverse ecosystems using this methodology.
Understanding prey-specific predator dependence is key for accurate ecological forecasting and conservation.