[Systemic insecticides: new risk for pollinator insects]

Area of Science:

• Environmental Chemistry
• Ecotoxicology
• Analytical Chemistry

Background:

• Imidacloprid, a systemic insecticide used in seed treatments since 1994 in France, offers reduced chemical application compared to traditional spraying.
• Concerns exist regarding imidacloprid's harmful effects on pollinators, particularly bees, with observed population declines linked to its introduction.
• Recent research indicates chronic and sub-lethal toxicity of imidacloprid at very low concentrations (micro g/kg).

Purpose of the Study:

• To develop and characterize a new quantitative analytical method for detecting imidacloprid.
• To measure imidacloprid bioavailability in environmental samples including soils, plants, flowers, and pollens.
• To provide a basis for evaluating the ecological risk posed by imidacloprid to bee populations.

Main Methods:

• Development of a novel quantitative analytical method for imidacloprid detection.
• Application of the method to analyze environmental matrices: soils, plants, flowers, and pollens.
• Characterization of imidacloprid bioavailability in these environmental compartments.

Main Results:

• A new quantitative analytical method was successfully developed and characterized.
• The method allows for the detection of imidacloprid at environmentally relevant, low concentrations.
• Bioavailability of imidacloprid in various environmental samples was assessed.

Conclusions:

• The developed analytical method is crucial for monitoring imidacloprid levels in the environment.
• Understanding imidacloprid bioavailability is essential for accurate risk assessment for bees.
• This research provides a foundation for evaluating the impact of imidacloprid on pollinator health.