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Related Experiment Video

Updated: Jul 23, 2025

Evaluating the Effect of Pesticides on the Larvae of the Solitary Bees
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Glyphosate impairs aversive learning in bumblebees.

Morgane Nouvian1, James J Foster2, Anja Weidenmüller2

  • 1Department of Biology, University of Konstanz, Konstanz, Germany; Centre for the Advanced Study of Collective Behaviour, University of Konstanz, Konstanz, Germany; Zukunftskolleg, University of Konstanz, Konstanz, Germany.

The Science of the Total Environment
|July 14, 2023
PubMed
Summary
This summary is machine-generated.

Glyphosate herbicide impairs bumblebee learning and sensory abilities, impacting foraging and predator avoidance. These non-lethal effects contribute to insect decline and ecosystem-wide foraging efficiency reduction.

Keywords:
AnthroposphereBeeCognitionConservationLearningPesticide

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Area of Science:

  • Environmental Science
  • Ecology
  • Toxicology

Background:

  • Agrochemicals, including glyphosate, are major drivers of global insect decline.
  • Non-lethal effects of pesticides on insect fitness are critical for conservation but often overlooked.
  • Sublethal impacts on behavior and cognition are crucial for understanding pesticide effects.

Purpose of the Study:

  • To investigate the long-term effects of glyphosate on bumblebee locomotion, phototaxis, and learning.
  • To assess the non-lethal impacts of glyphosate exposure on crucial sensory and cognitive functions in bumblebees.
  • To evaluate the potential consequences of these impairments for bumblebee foraging and survival.

Main Methods:

  • Utilized a fully automated, high-throughput assay for precise behavioral analysis.
  • Exposed bumblebees to glyphosate over an extended period.
  • Measured locomotion, phototaxis (response to light), and associative learning abilities.

Main Results:

  • Glyphosate showed minimal, transient effects on locomotion and did not affect phototactic drive.
  • A significant reduction in attraction to UV light was observed when blue light was an alternative.
  • Glyphosate exposure markedly impaired the learning of aversive stimuli in bumblebees.

Conclusions:

  • Glyphosate exerts specific, non-lethal effects on bumblebee sensory perception and cognitive processes.
  • These impairments pose significant challenges to bumblebee foraging and predator avoidance in agricultural landscapes.
  • The findings highlight the need to consider sublethal pesticide effects for pollinator conservation and ecosystem health, with the assay adaptable for other agrochemicals.