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Updated: Jun 20, 2026
13:04
An Introduction to Parasitic Wasps of Drosophila and the Antiparasite Immune Response
Published on: May 7, 2012
Host niches and defensive extended phenotypes structure parasitoid wasp communities
Richard Bailey1, Karsten Schönrogge, James M Cook
1Institute of Evolutionary Biology, School of Biology, University of Edinburgh, Edinburgh, United Kingdom.
Plos Biology
|August 27, 2009
Summary
Oak galls
Area of Science:
- Ecology
- Evolutionary Biology
- Entomology
Background:
- Parasitoids and their insect hosts form diverse communities, with factors structuring these interactions being poorly understood.
- Host traits, influenced by natural selection and phylogeny, significantly impact associated natural enemy communities.
Purpose of the Study:
- To investigate the impact of host traits and phylogenetic relatedness on parasitoid communities attacking gall-inducing wasps on oaks.
- To test the "Enemy Hypothesis," predicting that similar gall morphologies lead to similar parasitoid communities.
Main Methods:
- Analysis of 48 ecologically closed and species-rich communities of parasitoids on oak galls.
- Controlled for phylogenetic patterning in host traits and communities.
- Examined correlations between gall structural traits (toughness, hairiness, stickiness) and spatiotemporal niche (oak taxonomy, gall location) with parasitoid community structure.
Main Results:
- Significant correlations found between parasitoid community structure and gall structural traits, supporting the "Enemy Hypothesis."
- Parasitoid community structure was also predicted by host spatiotemporal niche (oak taxonomy, gall location).
- Combined traits explained up to 62% of the variation in community structure, driven by generalist parasitoids.
Conclusions:
- Gall morphology and location are key factors influencing parasitoid community structure, despite evolutionary pressures for escape.
- Observed patterns suggest niche specialization of generalist parasitoids contributes to community richness.
- Gallwasps' evolutionary escape from parasitoids is likely transient due to parasitoid adaptability to similar gall traits.
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