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Olfactory conditioning in mate searching by the parasitoid Aphidius ervi (Hymenoptera: Braconidae)

Published online by Cambridge University Press:  25 February 2008

C.A. Villagra ,
R.A. Vásquez  and
H.M. Niemeyer
C.A. Villagra*
Affiliation:
Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile
R.A. Vásquez
Affiliation:
Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile Instituto de Ecología y Biodiversidad, Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile
H.M. Niemeyer
Affiliation:
Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile
*
*Author for correspondence Fax: 1 (607) 254 1303 E-mail: [email protected]
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Abstract

Despite the fact that insect learning capacity has been broadly demonstrated, the role that this process plays during mate searching has been scarcely explored. We studied whether the sexual behaviour of a male parasitic wasp can be conditioned to the odours from two alternative host plant complexes (HPCs) present during its first copulation. The experimental subjects were newly emerged males of the aphid parasitoid, Aphidius ervi, and two alternative HPCs (alfalfa or wheat). In the training protocol, copulation experience corresponded to an unconditioning stimulus and HPC odours to the conditioning stimuli. The initial (just after eclosion) and trained responses were assessed in a glass Y-olfactometer. The results showed that neither alfalfa HPC nor wheat HPC stimuli elicited sexual-related behaviours in initial male responses. Conversely, both HPCs triggered strong attraction and wing fanning courtship behaviour in trained responses when the male was exposed to a female plus HPC during training. In males trained with females plus a given HPC but tested with the alternative HPC in the olfactometer, trained response showed a similar trend to the non-associative treatments. Hence, through learning, the olfactory stimulus context present during copulation could become a predictive cue for further mate searching. These results are discussed in terms of parasitic wasp ecology and host fidelity.

Keywords

insect sexual learningconditioned place preferencehost fidelity
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 98 , Issue 4 , August 2008 , pp. 371 - 377
Copyright
Copyright © 2008 Cambridge University Press

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