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Olfactory host finding, intermediate memory and its potential ecological adaptation in Nasonia vitripennis

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Abstract

Associative learning of host-associated chemical cues was studied in Nasonia vitripennis, a parasitoid of fly pupae in nests of hole-nesting birds. When females encountered a fly pupa and performed one sequence of host recognition behaviour including drilling the ovipositor into the host in the presence of the artificial odour furfurylheptanoate (FFH), they were afterwards arrested by FFH in olfactometer experiments. The response vanished after 4 days and could be blocked after 3 days by feeding wasps with ethacrynic acid prior and after the training. This indicates the formation of an intermediate form of memory by one host experience in N. vitripennis. Interestingly, the trained wasps avoided odours that were not present during the host encounter, although naive wasps did not react to these odours. This unique behaviour probably causes wasps to focus during host searching on those chemical cues they have experienced in the host environment. Studies in nests of hole-nesting birds revealed that about 30% of all nests contained only one fly pupa, and laboratory studies showed that N. vitripennis females are able to parasitise around 100 fly pupae in their life. It is discussed that under these conditions, the formation of a non-permanent intermediate memory for host-associated odours after one host encounter is adaptive to avoid costs involved with formation and maintenance of memory for misleading cues. The demonstration of associative olfactory learning in N. vitripennis, the first parasitoid species with sequenced genome, opens the gate to study molecular mechanisms of memory formation and its ecological adaptation in parasitoids.

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Acknowledgements

We wish to thank Stephanie-Simone Bertenbreiter, Dennis Grimm and Christian König for patiently counting fly pupae and Claudia Hezler and Nadine Timm for performing olfactometer experiments during a student course. Waltraud Laich and Reinhard Mache (Arbeitskreis für Vogelkunde und Vogelschutz e.V.) kindly provided us with old bird nests. Three unknown reviewers helped with their comments to improve an earlier version of the manuscript. The experiments comply with the current law of the country in which they were performed.

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Correspondence to Daria Schurmann.

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Schurmann, D., Collatz, J., Hagenbucher, S. et al. Olfactory host finding, intermediate memory and its potential ecological adaptation in Nasonia vitripennis . Naturwissenschaften 96, 383–391 (2009). https://doi.org/10.1007/s00114-008-0490-9

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  • DOI: https://doi.org/10.1007/s00114-008-0490-9

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