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Plant structural complexity and host-finding by a parasitoid.

D A Andow1, D R Prokrym1

  • 1Department of Entomology, University of Minnesota, 55108, St. Paul, MN, USA.

Oecologia
|March 18, 2017
PubMed
Summary
This summary is machine-generated.

Plant structural complexity significantly impacts parasitoid searching. Simpler plant structures led to higher parasitism rates and faster host discovery by Trichogramma nubilale (parasitoid wasps).

Keywords:
Area of searchGiving-up-timeSearching efficiencyTrichogramma nubilale

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Area of Science:

  • Entomology
  • Plant-Insect Interactions
  • Behavioral Ecology

Background:

  • Plant structure influences insect behavior, affecting host location by natural enemies.
  • Parasitoid wasps like Trichogramma nubilale rely on host cues and efficient searching strategies.
  • Key plant structural components include size, heterogeneity, and complexity.

Purpose of the Study:

  • To investigate how plant structural complexity affects the searching behavior and success of the parasitoid Trichogramma nubilale.
  • To isolate the effect of structural complexity, controlling for plant size and surface heterogeneity.

Main Methods:

  • Controlled experiments presenting female parasitoids with simple versus complex artificial surfaces.
  • Quantification of parasitism rates, searching time, and host discovery efficiency.
  • Manipulation of plant structural complexity while keeping size and heterogeneity constant.

Main Results:

  • Parasitism rates were 2.9 times higher on simple surfaces compared to complex ones.
  • Females found hosts 2.4 times faster on simple surfaces, indicating enhanced searching efficiency.
  • Surprisingly, searching time increased by 1.2 times on simple surfaces when no hosts were present, suggesting an effect on giving-up time.

Conclusions:

  • Plant structural complexity is a critical factor influencing parasitoid search success.
  • Simpler plant structures enhance parasitoid efficiency and parasitism rates.
  • Structural complexity can alter parasitoid decision-making, including their giving-up time.