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Complex behavioural changes after odour exposure in Drosophila larvae

  • Colomb, Julien Gènes et Dynamique des Systèmes de Mémoire, CNRS UMR 7637, Paris, France - Department of Biology and Program in Neuroscience, University of Fribourg, Switzerland
  • Grillenzoni, Nicola Department of Biology and Program in Neuroscience, University of Fribourg, Switzerland
  • Stocker, Reinhard F. Department of Biology and Program in Neuroscience, University of Fribourg, Switzerland
  • Ramaekers, Ariane Department of Biology and Program in Neuroscience, University of Fribourg, Switzerland
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    26.02.2007
Published in:
  • Animal Behaviour. - 2007, vol. 73, no. 4, p. 587-594
Drosphila larvae
odorants
olfactory learning
English A variety of odorants attract Drosophila larvae, although this behaviour can be modulated by experience. For instance, larvae pre-exposed to an attractive odorant may subsequently display less attraction towards the same compound. In previous reports, this phenomenon has been interpreted as a drop in olfactory sensitivity, caused by sensory adaptation. We tried to elucidate the basis of this behavioural modification by pre-exposing larvae to various odours. After multiple pre-exposure cycles larvae were repulsed by initially attractive odours, and pre-exposure did not change the threshold concentration driving a behavioural response. We therefore believe that sensitivity to the odorant was only slightly affected in our protocol. Our results thus do not support the previous interpretation and rather suggest that olfactory pre-exposure induces a change in the hedonic value of the odour. Although we did not succeed in elucidating the exact nature of the underlying mechanism, we can reject an association of the odour with the absence of food as an interpretation of the observed behavioural changes; this is because addition of food did not abolish the repulsion to the pre-exposed odour. In addition to ruling out previous interpretations of odour pre-exposure effects, this study stresses the complexity of Drosophila larval behaviour.
Faculty
Faculté des sciences et de médecine
Department
Département de Biologie
Language
  • English
Classification
Biological sciences
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/300435
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