Document Detail

Hyperparasitoids use herbivore-induced plant volatiles to locate their parasitoid host.
MedLine Citation:
PMID:  23209379     Owner:  NLM     Status:  MEDLINE    
Plants respond to herbivory with the emission of induced plant volatiles. These volatiles may attract parasitic wasps (parasitoids) that attack the herbivores. Although in this sense the emission of volatiles has been hypothesized to be beneficial to the plant, it is still debated whether this is also the case under natural conditions because other organisms such as herbivores also respond to the emitted volatiles. One important group of organisms, the enemies of parasitoids, hyperparasitoids, has not been included in this debate because little is known about their foraging behaviour. Here, we address whether hyperparasitoids use herbivore-induced plant volatiles to locate their host. We show that hyperparasitoids find their victims through herbivore-induced plant volatiles emitted in response to attack by caterpillars that in turn had been parasitized by primary parasitoids. Moreover, only one of two species of parasitoids affected herbivore-induced plant volatiles resulting in the attraction of more hyperparasitoids than volatiles from plants damaged by healthy caterpillars. This resulted in higher levels of hyperparasitism of the parasitoid that indirectly gave away its presence through its effect on plant odours induced by its caterpillar host. Here, we provide evidence for a role of compounds in the oral secretion of parasitized caterpillars that induce these changes in plant volatile emission. Our results demonstrate that the effects of herbivore-induced plant volatiles should be placed in a community-wide perspective that includes species in the fourth trophic level to improve our understanding of the ecological functions of volatile release by plants. Furthermore, these findings suggest that the impact of species in the fourth trophic level should also be considered when developing Integrated Pest Management strategies aimed at optimizing the control of insect pests using parasitoids.
Erik H Poelman; Maaike Bruinsma; Feng Zhu; Berhane T Weldegergis; Aline E Boursault; Yde Jongema; Joop J A van Loon; Louise E M Vet; Jeffrey A Harvey; Marcel Dicke
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-11-27
Journal Detail:
Title:  PLoS biology     Volume:  10     ISSN:  1545-7885     ISO Abbreviation:  PLoS Biol.     Publication Date:  2012  
Date Detail:
Created Date:  2012-12-04     Completed Date:  2013-04-18     Revised Date:  2013-07-11    
Medline Journal Info:
Nlm Unique ID:  101183755     Medline TA:  PLoS Biol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  e1001435     Citation Subset:  IM    
Laboratory of Entomology, Wageningen University, Wageningen, the Netherlands.
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MeSH Terms
Body Size
Brassica / chemistry*,  physiology
Butterflies / parasitology*,  physiology
Clutch Size
Larva / physiology
Species Specificity
Volatile Organic Compounds / chemistry*
Wasps / physiology*
Reg. No./Substance:
0/Volatile Organic Compounds
Comment In:
PLoS Biol. 2012;10(11):e1001437   [PMID:  23209381 ]

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