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2010-12-21 - Colloque/Présentation - communication orale - Anglais - 1 page(s)

Michez Denis , Vanderplanck Maryse , Rasmont Pierre , Lognay Georges, "Physiological constraint in host-plant specialization among specialist and generalist wild bees" in Bee-together, Ghent, Belgique, 2010

  • Codes CREF : Chimie analytique (DI1314), 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 observed 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 generations. 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. We present here our first analyzes of pollen composition of some common bee host-plants and their likely impact on bee development.