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Related Experiment Video

Updated: Mar 19, 2026

Studying Food Reward and Motivation in Humans
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Associational effects need to be studied within an optimal foraging framework.

Emilie Champagne1

  • 1Direction de la recherche forestière, Ministère des Ressources naturelles et des Forêts, Québec, Quebec, Canada.

Ecology
|March 18, 2026
PubMed
Summary

Herbivores choose plants based on resource availability and constraints, a concept explained by optimal foraging theory. Integrating this framework improves understanding of plant-herbivore interactions and associational effects.

Keywords:
diet selectionfacilitationherbivoryneighborhood effectresource selection

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Area of Science:

  • Ecology
  • Zoology
  • Botany

Background:

  • Plant-herbivore interactions are central to ecology, with a key question being resource selection by herbivores.
  • The theory of optimal foraging offers a mathematical framework for understanding animal resource selection under constraints.
  • Associational effects, which describe how plant community characteristics influence herbivory patterns, have yielded variable results, suggesting a need for alternative explanations.

Purpose of the Study:

  • To bridge the gap between optimal foraging theory and associational effects research in plant-herbivore interactions.
  • To evaluate whether proposed mechanisms for associational effects can be explained by optimal foraging.
  • To provide guidance for future studies to differentiate between optimal foraging and other mechanisms driving associational effects.

Main Methods:

  • Reviewing existing literature on associational effects and optimal foraging theory.
  • Analyzing studies, primarily with mammalian herbivores and invertebrates, that integrate optimal foraging frameworks.
  • Evaluating proposed mechanisms for associational effects in the context of herbivore foraging choices.

Main Results:

  • Associational effects studies often overlook herbivores' active foraging choices, such as plant size.
  • Optimal foraging theory provides a potential explanation for the variability and idiosyncrasy observed in associational effects.
  • Integrating optimal foraging principles can enhance the understanding of plant-herbivore interactions and associational effects.

Conclusions:

  • Optimal foraging theory offers a unifying framework for understanding plant-herbivore interactions and associational effects.
  • Considering herbivores as active agents in these interactions links to broader ecological fields like nutritional and landscape ecology.
  • This integrated approach has significant implications for conservation and wildlife management practices.