Abstract
Bees provide crucial pollination services for crop cultivation, contributing billions of dollars to the global agricultural economy. However, exposure to pesticides such as neonicotinoids represents a major problem for bee health, necessitating strategies that can improve agricultural sustainability and pollinator health. Here we report a simple and scalable solution, through ingestible hydrogel microparticles (IHMs), which can capture neonicotinoids in vitro and in the bee gastrointestinal tract to mitigate the harmful effects of pesticides. Using the common eastern bumblebee (Bombus impatiens) as a model species and the neonicotinoid imidacloprid, we demonstrated by means of lethal and sublethal assays the substantial benefits of IHM treatments. Under lethal exposure of imidacloprid, bumblebees that received IHM treatment exhibited a 30% increase in survival relative to groups without IHM treatment. After a sublethal exposure of 5 ng, IHM treatment resulted in improved feeding motivation and a 44% increase in the number of bees that engaged in locomotor activity. Wingbeat frequency was significantly lower after a single 5 or 10 ng imidacloprid dose; however, IHM treatment improved wingbeat frequency. Overall, the IHMs improved bumblebee health, and with further optimization have the potential to benefit apiculture and reduce risk during crop pollination by managed bees.
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Data availability
Wingbeat frequency videos were captured using a high-speed camera, which resulted in the raw data files being exceedingly large; therefore, they are available from the corresponding author upon reasonable request. Videos acquired during locomotion studies can be found at https://github.com/julia-caserto/Bee-Locomotion-Analysis. Source data are provided with this paper.
Code availability
Code used to analyze locomotion videos can be found at https://github.com/julia-caserto/Bee-Locomotion-Analysis.
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Acknowledgements
Cornell University Department of Human Ecology for the use of HPLC. Fluorescence microscopy was carried out at the Cornell Institute of Biotechnology’s BRC Imaging Facility. We acknowledge the use of field emission scanning electron microscopy supported by NSF through the Cornell University Materials Research Science and Engineering Center DMR-1719875. This work was supported by the New York State Environmental Protection Fund. We acknowledge the following USDA NIFA grants: 2021-22-127 (M.M.) and 2021-08373 (M.K.S.). We thank A. Rios Tascon for helping design locomotion chambers and providing code to analyze locomotion videos. Schematics in Fig. 1a and 4a were created with BioRender.com.
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J.S.C. and M.M. conceived the study. J.S.C., M.M. and S.H.M. designed experiments. J.S.C. conducted and supervised all experiments and data collection. L.W. prepared materials, performed colony maintenance and assisted with bee transfers and experiments. S.F. assisted with bee transfers and experiments. C.R., M.H., S.J. and M.K.S. collected WBF data and calculated WBF. J.S.C. analyzed all data collected. J.S.C., S.H.M. and M.M. reviewed and interpreted the results. J.S.C. wrote the paper; M.M. provided substantial edits. All authors reviewed and commented on the paper.
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Caserto, J.S., Wright, L., Reese, C. et al. Ingestible hydrogel microparticles improve bee health after pesticide exposure. Nat Sustain 7, 1441–1451 (2024). https://doi.org/10.1038/s41893-024-01432-5
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DOI: https://doi.org/10.1038/s41893-024-01432-5


