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Infochemical-mediated intraguild interactions among three predatory mites on cassava plants.

Désiré Gnanvossou1, Rachid Hanna, Marcel Dicke

  • 1Biological Control Centre for Africa, International Institute of Tropical Agriculture, BP 08-0932, Cotonou, Benin.

Oecologia
|March 21, 2003
PubMed
Summary
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Predatory mites use volatile cues from prey patches to avoid competitors, influencing predator guild structure. This behavior is crucial for survival and population dynamics, especially when food is scarce.

Area of Science:

  • Ecology
  • Behavioral Ecology
  • Chemical Ecology

Background:

  • Carnivorous arthropods face challenges balancing foraging and predator avoidance, especially with limited prey.
  • Understanding predator interactions is vital for ecological dynamics, particularly in resource-scarce environments.

Purpose of the Study:

  • To investigate how volatile chemicals from prey patches, influenced by the presence of conspecific or heterospecific predators, shape predator guild structure.
  • To determine if predatory mites can use olfactory cues to assess prey patch profitability and avoid competitors.

Main Methods:

  • An olfactometer was used to test the responses of three predatory mite species (Typhlodromalus manihoti, T. aripo, and Euseius fustis) to odours from prey (Mononychellus tanajoa)-infested cassava leaves.
  • The odour sources included prey alone or prey with conspecific or heterospecific predators.

Related Experiment Videos

Main Results:

  • All three predatory mite species avoided odour sources associated with the presence of other predatory mites (conspecifics or heterospecifics).
  • Typhlodromalus manihoti demonstrated the ability to discriminate between conspecific and heterospecific predator odours, showing a preference for patches with T. aripo over T. manihoti.
  • The findings indicate that predatory mites can assess prey patch profitability using volatile cues.

Conclusions:

  • Volatile chemicals from prey patches containing competitors significantly influence the behavior of predatory mites.
  • Interspecific and intraspecific interactions mediated by olfactory cues play a substantial role in structuring predator guilds and affect population dynamics.
  • These behaviors are particularly important under conditions of low prey availability, impacting both predator and prey populations.