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Modifications of the cuticular hydrocarbon profile of Apis mellifera worker bees in the presence of the ectoparasitic mite Varroa jacobsoni in brood cells

Published online by Cambridge University Press:  21 May 2002

M. SALVY
Affiliation:
INRA, Zoologie et Apidologie, Site Agroparc, 84914 Avignon Cedex 9, France Laboratoire Biové, rue de Lorraine, BP 45, 62510 Arques, France
C. MARTIN
Affiliation:
INRA, Zoologie et Apidologie, Site Agroparc, 84914 Avignon Cedex 9, France
A.G. BAGNÈRES
Affiliation:
CNRS, Laboratoire de Neurobiologie-Communication Chimique, 31 chemin J. Aiguier, 13402 Marseille, France
É. PROVOST
Affiliation:
CNRS, Laboratoire de Neurobiologie-Communication Chimique, 31 chemin J. Aiguier, 13402 Marseille, France
M. ROUX
Affiliation:
Université Aix-Marseille III, avenue Escadrille Normandie-Niemen, 13397 Marseille, France
Y. LE CONTE
Affiliation:
INRA, Zoologie et Apidologie, Site Agroparc, 84914 Avignon Cedex 9, France
J.L. CLÉMENT
Affiliation:
CNRS, Laboratoire de Neurobiologie-Communication Chimique, 31 chemin J. Aiguier, 13402 Marseille, France

Abstract

Varroa jacobsoni is an ectoparasite of Apis mellifera which invades brood cells, on 8-day-old larvae several hours before cell capping. Reproduction of the parasite takes place in the capped brood cells during the nymphose of the bee. Cuticular hydrocarbons of unparasitized bees and of bees parasitized by Varroa jacobsoni were extracted and analysed by gas chromatography (GC) coupled with mass spectrometry (GC-MS). Three developmental stages of worker honey bees were studied: larvae, pupae and emergent adults. The comparison between unparasitized and parasitized hosts was performed with Principal Components Analysis coupled with a multivariate variance analysis. The cuticular hydrocarbon profiles of honey bees were qualitatively similar, for the 3 developmental stages and regardless of the presence of Varroa in the cells. Nevertheless, comparison of the relative proportions of hydrocarbons showed that the cuticular profiles of pupae and emergent adults parasitized by 1 mite and of larvae parasitized by 2 mites were significantly different from the corresponding unparasitized individuals. Such modifications could be regarded (i) as a cause of the multi-infestation in larvae during invasion of brood and (ii) as a consequence of stress and/or removal of proteins contained in the haemolymph of the host during its development.

Type
Research Article
Copyright
© 2001 Cambridge University Press

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