Pesticide use negatively affects bumble bees across European landscapes

Area of Science:

• Ecology
• Environmental Science
• Agricultural Science

Background:

• Sustainable agriculture necessitates balancing crop production with protecting non-target organisms like bees.
• Neonicotinoid insecticide use has been linked to negative effects on wild bee populations.
• Field evidence on the impact of landscape-level pesticide exposure on wild bees, beyond neonicotinoids, is limited.

Purpose of the Study:

• To investigate the effects of landscape pesticide exposure on wild bee colony performance.
• To assess whether the combination of pesticides found in pollen affects bumble bee colony health.
• To evaluate the effectiveness of current regulatory systems in protecting pollinators from agricultural pesticide impacts.

Main Methods:

• Analysis of pesticides in pollen collected by bumble bees across 106 agricultural sites in eight European countries.
• Monitoring of 316 Bombus terrestris colonies to assess colony performance.
• Correlation analysis between pesticide presence in pollen, landscape simplification, and colony development.

Main Results:

• Pesticides found in bumble bee-collected pollen were associated with reduced colony performance during crop bloom.
• This negative association was more pronounced in simplified agricultural landscapes with intensive farming practices.
• Results indicate that regulatory systems may not sufficiently prevent pesticide-related harm to eusocial pollinators.

Conclusions:

• Landscape pesticide exposure poses a significant risk to wild bee colony health, even in social species.
• Current agricultural pesticide regulations may be insufficient to protect non-target organisms.
• Post-approval monitoring of pesticide exposure and effects is crucial for environmental protection.