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Lethal and sublethal effects of azadirachtin on the bumblebee Bombus terrestris (Hymenoptera: Apidae)

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Abstract

Azadirachtin is a biorational insecticide commonly reported as selective to a range of beneficial insects. Nonetheless, only few studies have been carried out with pollinators, usually emphasizing the honeybee Apis mellifera and neglecting other important pollinator species such as the bumblebee Bombus terrestris. Here, lethal and sublethal effects of azadirachtin were studied on B. terrestris via oral exposure in the laboratory to bring out the potential risks of the compound to this important pollinator. The compound was tested at different concentrations above and below the maximum concentration that is used in the field (32 mg L−1). As most important results, azadirachtin repelled bumblebee workers in a concentration-dependent manner. The median repellence concentration (RC50) was estimated as 504 mg L−1. Microcolonies chronically exposed to azadirachtin via treated sugar water during 11 weeks in the laboratory exhibited a high mortality ranging from 32 to 100 % with a range of concentrations between 3.2 and 320 mg L−1. Moreover, no reproduction was scored when concentrations were higher than 3.2 mg L−1. At 3.2 mg L−1, azadirachtin significantly inhibited the egg-laying and, consequently, the production of drones during 6 weeks. Ovarian length decreased with the increase of the azadirachtin concentration. When azadirachtin was tested under an experimental setup in the laboratory where bumblebees need to forage for food, the sublethal effects were stronger as the numbers of drones were reduced already with a concentration of 0.64 mg L−1. Besides, a negative correlation was found between the body mass of male offspring and azadirachtin concentration. In conclusion, our results as performed in the laboratory demonstrated that azadirachtin can affect B. terrestris with a range of sublethal effects. Taking into account that sublethal effects are as important as lethal effects for the development and survival of the colonies of B. terrestris, this study confirms the need to test compounds on their safety, especially when they have to perform complex tasks such as foraging. The latter agrees with the recent European Food Safety Authority guidelines to assess ‘potentially deleterious’ compounds for sublethal effects on behavior.

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Acknowledgments

We thank the CAPES Foundation (Brazilian Ministry of Education) for the scholarship and financial support to W.F. Barbosa. This project was also support by the Research Council of Ghent University (BOF-UGent) and the Flemish government agency for Innovation by Science and Technology (IWT, Belgium).

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The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Department of Crop Protection, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000, Ghent, Belgium

    Wagner Faria Barbosa, Laurens De Meyer & Guy Smagghe

  2. Departamento de Entomologia, Universidade Federal de Viçosa, Av. Peter Henry Rolfs, Viçosa, Minas Gerais, 36570-900, Brazil

    Wagner Faria Barbosa & Raul Narciso C. Guedes

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  1. Wagner Faria Barbosa
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  2. Laurens De Meyer
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  3. Raul Narciso C. Guedes
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  4. Guy Smagghe
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Correspondence to Guy Smagghe.

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Barbosa, W.F., De Meyer, L., Guedes, R.N.C. et al. Lethal and sublethal effects of azadirachtin on the bumblebee Bombus terrestris (Hymenoptera: Apidae). Ecotoxicology 24, 130–142 (2015). https://doi.org/10.1007/s10646-014-1365-9

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