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2010-09-07 - Colloque/Présentation - communication orale - Anglais - 1 page(s)

Michez Denis , Vanderplanck Maryse , "Host-plant specialization in bees" in 4th EurBee congress, Ankara, Turquie, 2010

  • Codes CREF : Entomologie (DI3163), Ecologie (DI3123)
  • Unités de recherche UMONS : Zoologie (S869)
  • Instituts UMONS : Institut des Biosciences (Biosciences)

Abstract(s) :

(Anglais) Females of bees do not forage randomly on flowering plants. Specialized behaviors have been selected in social and solitary species to optimize foraging on suitable pollen. In social species like honeybees and bumblebees, host-plant specialization is often limited at individual, temporal, geographical and/or generational scale. Specialist behaviors (called floral constancy) result here from individual learning abilities. But in many solitary species like melittid bees, pollen specialization is innate and inherited in all individuals. The taxonomic fidelity of females (called oligolecty) is constant throughout their life, their geographic range and across generation. Many physiological and morphological adaptations to oligolecty have been described but constraints and ultimate causes of this kind of host-plant specialization are still poorly understood. More than selection for optimal foraging, oligolecty could result from the need of peculiar chemicals (sterols, proteins, ...) in pollen which reduce the range of suitable hosts.