Extrapolating Acute Contact Bee Sensitivity to Insecticides Based on Body Weight Using a Phylogenetically Informed...

Area of Science:

• Environmental Toxicology
• Ecotoxicology
• Insecticide Risk Assessment

Background:

• Insecticides are vital for global food production but pose risks to non-target organisms, particularly bees.
• Research on insecticide effects has predominantly focused on honeybees (Apis mellifera), neglecting the sensitivity of many other bee species.
• A lack of comprehensive hazard assessments for diverse bee species hinders accurate risk characterization and effective bee protection strategies.

Purpose of the Study:

• To develop interspecies scaling models for predicting bee sensitivity to insecticides based on body weight.
• To investigate the role of phylogenetic background in cross-species sensitivity extrapolation.
• To improve hazard assessment and risk characterization for a wider range of bee species.

Main Methods:

• Collected published acute contact sensitivity data (median lethal dose per bee) for various bee species exposed to insecticides.
• Incorporated data on bee body weight and phylogenetic relationships into interspecies scaling models.
• Utilized statistical approaches to analyze the predictive power of body weight and the influence of phylogeny.

Main Results:

• Bee body weight was identified as a significant predictor of acute contact sensitivity to a range of insecticides.
• Phylogenetic relatedness among bee species was found to be an important factor to consider in cross-species analyses.
• Phylogeny did not consistently confound the observed effects of body weight on insecticide sensitivity.

Conclusions:

• Interspecies extrapolation of insecticide sensitivity using body weight is feasible but requires consideration of phylogenetic non-independence.
• Accurate risk characterization for diverse bee populations necessitates models that account for both body weight and evolutionary history.
• This study provides a framework for more robust hazard assessments, crucial for the conservation of vital bee pollinators.