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

Hao Xu, Guoxin Zhou, Stefan Dötterl, Irmgard Schäffler, Martin Von Arx, Gregory Röder, Thomas Degen, Li Chen & Ted Turlings

Abstract 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.
   
Keywords Sex pheromones
Parasitoids
Mate location
Sex allocation
Cotesia glomerata
   
Citation Xu, H., Zhou, G., Dötterl, S., Schäffler, I., von Arx, M., Röder, G., Degen, T., Chen, L., & Turlings, T. (2019). The combined use of an attractive and repellent sex pheromonal component by a gregarious parasitoid. Journal of Chemical Ecology, 45, 559-569.
   
Type Journal article (English)
Date of appearance 28-3-2019
Journal Journal of Chemical Ecology
Volume 45
Pages 559-569
URL https://doi.org/10.1007/s10886-019-01066-4