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Herbivore-induced infochemicals influence foraging behaviour in two intertidal predators.

Ross A Coleman1, Sorain J Ramchunder, Kelly M Davis

  • 1Marine Biology and Ecology Research Centre, School of Biological Sciences, University of Plymouth, Plymouth, PL4 8AA, UK. rcoleman@usyd.edu.au

Oecologia
|November 16, 2006
PubMed
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Marine plants release chemical cues when attacked by herbivores, influencing predator behavior. These infochemicals attract predators like fish and crabs to herbivore-induced plants, impacting marine food webs.

Area of Science:

  • Marine ecology
  • Chemical ecology
  • Tritrophic interactions

Background:

  • Herbivore-induced plant defenses are common in terrestrial ecosystems.
  • These defenses can impact herbivore populations indirectly through natural enemies.
  • Such tritrophic interactions have not been well-studied in marine environments.

Purpose of the Study:

  • To investigate if herbivore-induced chemical changes in marine plants affect predator foraging behavior.
  • To test for indirect effects of plant defenses on marine herbivores via predators.

Main Methods:

  • Experiments used Ascophyllum nodosum (seaweed) with different prior treatments: control, mechanical damage, or herbivory.
  • A novel flow-through flume served as a choice chamber to test predator responses.

Related Experiment Videos

  • The foraging behavior of the crab Carcinus maenas and the fish Lipophrys pholis was observed.

    • Main Results:

    • Infochemicals from herbivore-induced seaweed attracted predators.
    • Lipophrys pholis was attracted to both feeding herbivores and herbivore-induced plant odors.
    • Carcinus maenas was attracted to herbivore-induced plant odors, irrespective of herbivore presence.

    Conclusions:

    • This study demonstrates that herbivore-induced changes in marine plants can directly influence predator foraging behavior.
    • These findings represent the first evidence of such indirect plant-herbivore interactions in marine systems.
    • Induced plant defenses in marine environments may play a significant role in regulating herbivore populations.