Abstract
Large-scale honey bee colony losses reported around the world have been associated with intoxication with pesticides, as with the presence of pests and pathogens. Among pesticides, neonicotinoid insecticides are the biggest threat. Due to their extensive use, they can be found in all agricultural environments, including soil, water, and air, are persistent in the environment, and are highly toxic for honey bees. In addition, infection by different pests and pathogens can act synergistically, weakening bees. In this study, we investigated the effects of chronic exposure to sublethal doses of imidacloprid alone or combined with the microsporidia Nosema ceranae on the immune response, deformed wing virus infection (DWV), gut microbiota, and survival of Africanized honey bees. We found that imidacloprid affected the expression of some genes associated with immunity generating an altered physiological state, although it did not favor DWV or N. ceranae infection. The pesticide alone did not affect honey bee gut microbiota, as previously suggested, but when administered to N. ceranae infected bees, it generated significant changes. Finally, both stress factors caused high mortality rates. Those results illustrate the negative impact of imidacloprid alone or combined with N. ceranae on Africanized honey bees and are useful to understand colony losses in Latin America.
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Data Availability
The sequence datasets generated during the current study are available in the NCBI BioProject database (accession number PRJNA741666).
Code Availability
Not applicable.
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Acknowledgements
The authors thank Enrique Nogueira and Pablo Juri from the Faculty of Veterinary Medicine, Universidad de la República, Montevideo, Uruguay, for the use of their experimental apiary and Jorge Harriet and Juan Campá from the Miguel Rubino Veterinary Laboratory-MGAP, for advices and providing N. ceranae–infected honey bees.
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This study was funded by Agencia Nacional de Investigación e Innovación (ANII-FCE_1_2017_1_135810 and POS_NAC_2018_1_151557) and L’Oréal-UNESCO Award for Women in Science 2017.
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Conceptualization, P.Z. and K.A.; funding acquisition and project administration, K.A.; investigation and data analysis, S.B. and L.C.; writing—original draft, S.B. and K.A.; writing—review and editing, S.B., L.C., P.Z., and K.A. All authors have read and agreed to the published version of the manuscript.
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Balbuena, S., Castelli, L., Zunino, P. et al. Effect of Chronic Exposure to Sublethal Doses of Imidacloprid and Nosema ceranae on Immunity, Gut Microbiota, and Survival of Africanized Honey Bees. Microb Ecol 85, 1485–1497 (2023). https://doi.org/10.1007/s00248-022-02014-8
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DOI: https://doi.org/10.1007/s00248-022-02014-8