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Neonicotinoids decrease sucrose responsiveness of honey bees at first contact.

Fabien J Démares1, Christian W W Pirk1, Susan W Nicolson1

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Neonicotinoid insecticides disrupt bee feeding behavior, significantly reducing their response to sucrose solutions. These findings highlight neonicotinoids as multisensory disruptors impacting essential insect pollinators.

Keywords:
Apis mellifera scutellataHoney bee foragingNeonicotinoidSucrose thresholdTaste attenuation

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Area of Science:

  • Environmental Science
  • Entomology
  • Toxicology

Background:

  • Neonicotinoid insecticides are widely used globally, affecting insect behavior and physiology.
  • Bees are exposed to neonicotinoids via pollen and nectar, impacting their navigation and foraging.
  • Previous research indicated thiamethoxam's effect on young bee sucrose responsiveness.

Purpose of the Study:

  • To investigate the effects of sublethal doses of clothianidin, imidacloprid, and thiamethoxam on honey bee forager sucrose responsiveness.
  • To assess the impact of neonicotinoid-laced sucrose solutions on naive bees, mimicking initial exposure scenarios.

Main Methods:

  • Caged honey bee foragers were exposed to sublethal doses of three neonicotinoids (clothianidin, imidacloprid, thiamethoxam).
  • Sucrose responsiveness was tested individually using standard methods under various exposure conditions (pre-exposure, direct exposure, or both).
  • Naive bees were tested with neonicotinoid-laced sucrose solutions of varying concentrations.

Main Results:

  • All three neonicotinoids detrimentally affected bee responses to mid-to-high sucrose concentrations.
  • Unexposed bees showed reduced responses to higher sucrose concentrations when tested with laced solutions.
  • Neonicotinoid exposure impaired sucrose responsiveness across different experimental paradigms.

Conclusions:

  • Neonicotinoids act as multisensory disruptors, significantly impairing insect feeding responses.
  • These findings provide further evidence of neonicotinoids' detrimental effects on pollinators at first contact.
  • The study underscores the potent impact of neonicotinoids on beneficial insects, including bees.