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  4. The combined use of an attractive and repellent sex pheromonal component by a gregarious parasitoid
 
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The combined use of an attractive and repellent sex pheromonal component by a gregarious parasitoid

Auteur(s)
Xu, Hao 
Institut de biologie 
Dötterl, Stefan
Zhou, Guoxin 
Institut de biologie 
Schäffler, Irmgard
von Arx, Martin
Röder, Gregory 
Cours de médecine 
Degen, Thomas 
Institut de biologie 
Chen, Li 
Institut de biologie 
Turlings, Ted 
Institut de biologie 
Date de parution
2019-3-28
In
Journal of Chemical Ecology
No
45
De la page
559
A la page
569
Revu par les pairs
1
Mots-clés
  • Sex pheromones Parasitoids Mate location Sex allocation Cotesia glomerata
  • Sex pheromones Parasi...

Résumé
Gregarious parasitoids usually clump their cocoons together and the adults emerge in a synchronized fashion. This makes it easy for them to find mating partners and most copulations indeed take place at the natal patch. Yet, males should leave such sites when females are no longer receptive. As yet, this decision-making process and the possible involvement of pheromones were poorly understood. Here we report on a remarkable use of attractive and repellent pheromones of the well-studied gregarious parasitoid species Cotesia glomerata (L.) (Hymenoptera: Braconidae). Virgin C. glomerata females were found to release an attractive as well as a repellent compound, which in combination arrest males on the natal patch, but after mating the females stop the production of the attractant and the males are repelled. The repellent compound was identified as heptanal, which was also released by males, probably reducing male-male competition on the natal patch. We also confirmed that the sex ratio of the emerging wasps can vary considerably among patches, depending on the relative quality of hosts and the number of females that parasitize a host. The newly revealed use of attractive and repellent pheromone compounds by C. glomerata possibly helps maximize mating success under these variable conditions.
Identifiants
https://libra.unine.ch/handle/123456789/28377
_
10.1007/s10886-019-01066-4
Type de publication
journal article
Dossier(s) à télécharger
 main article: 2020-06-19_2607_2253.pdf (2.47 MB)
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