, Volume 88, Issue 2, pp 78–81

Structural differences in the drone olfactory system of two phylogenetically distant Apis species, A. florea and A. mellifera

  • Axel Brockmann
  • Dorothea Brückner
Short Communication


Male insects that are attracted by sex pheromones to find their female mates over long distances have specialized olfactory subsystems. Morphologically, these subsystems are characterized by a large number of receptor neurons sensitive to components of the female's pheromones and hypertrophied glomerular subunits ('macroglomeruli' or 'macroglomerular complexes') in the antennal lobes, in which the axons of the receptor neurons converge. The olfactory subsystems are adapted for an increased sensitivity to perceive minute amounts of pheromones. In Apis mellifera, drones have 18,600 olfactory poreplate sensilla per antenna, each equipped with receptor neurons sensitive to the queen's sex pheromone, and four voluminous macroglomeruli (MG1–MG4) in the antennal lobes. In contrast, we show that drones of the phylogenetically distant species, Apis florea, have only 1,200 poreplate sensilla per antenna and only two macroglomeruli in their antennal lobes. These macroglomeruli are homologous in anatomical position to the two most prominent macroglomeruli in A. mellifera, the MG1 and MG2, but they are much smaller in size. The morphological and anatomical differences described here suggest major modifications in the sex-pheromone processing subsystem of both species: (1) less pheromone sensitivity in A. florea and (2) a more complex sex-pheromone processing and thus a more complex sex-pheromone communication in A. mellifera.


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Copyright information

© Springer-Verlag 2001

Authors and Affiliations

  • Axel Brockmann
    • 1
  • Dorothea Brückner
    • 2
  1. 1.Institut für Verhaltensphysiologie und Soziobiologie, Theodor-Boveri-Institut für Biowissenschaften, Universität Würzburg, 97074 Würzburg, Germany
  2. 2.Forschungstelle für Bienenkunde, Universität Bremen, Postfach 330440, 28344 Bremen, Germany

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