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Related Experiment Videos

Host-parasitoid interaction as affected by interkingdom competition.

Marko Rohlfs1

  • 1Zoological Institute, Department of Animal Ecology, Christian-Albrechts-University of Kiel, Kiel, Germany. rohlfs@zoologie.uni-kiel.de

Oecologia
|November 9, 2007
PubMed
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Interkingdom competition between the mould Aspergillus niger and the parasitoid Asobara tabida impacts Drosophila melanogaster larval survival. Fungi create an Allee effect for parasitized larvae, altering host-parasitoid dynamics.

Area of Science:

  • Ecology
  • Population Dynamics
  • Interspecies Interactions

Background:

  • Interkingdom competition, interactions between distantly related organisms, is underrepresented in ecological research.
  • Toxic filamentous fungi like Aspergillus niger compete with Drosophila melanogaster larvae, affecting host survival.
  • The model host-parasitoid system Drosophila melanogaster-Asobara tabida is used to study these interactions.

Purpose of the Study:

  • Investigate how Aspergillus niger affects the Drosophila-parasitoid system.
  • Determine how the host-parasitoid interaction influences the fungal competitor.
  • Understand the consequences of interkingdom competition on trophic interactions and population dynamics.

Main Methods:

  • Experimental manipulation of larval density and fungal presence.

Related Experiment Videos

  • Assessment of host larval mortality under different conditions.
  • Observation of parasitoid foraging behavior in fungus-infested patches.

    • Main Results:

    • Aspergillus niger induced a strong Allee effect for parasitized larvae, decreasing mortality with increased density.
    • Kojic acid, a fungal metabolite, did not cause higher mortality in parasitized larvae.
    • Parasitoids reduced foraging in fungus-infested areas, suggesting a benefit for larvae in these patches.

    Conclusions:

    • Interkingdom competition plays a significant role in trophic interactions within saprophagous communities.
    • Fungal presence alters host-parasitoid dynamics and influences microbial population dynamics.
    • Understanding these interactions is crucial for predicting ecosystem stability and function.