Field-level clothianidin exposure affects bumblebees but generally not their pathogens

Research output: Contribution to journalArticle


Neonicotinoids are implicated in bee declines and laboratory studies imply that they impair the bee immune system, thereby precipitating a rise in pathogen levels. To establish whether such synergisms reduce bee performance in real-world agricultural landscapes, we analysed the microbial composition of the bumblebee (Bombus terrestris) samples from our recent landscape study on the impacts of field-level clothianidin exposure. We related clothianidin exposure and microbial composition to both individual- and colony-level performance parameters, to better understand the direct and indirect mechanistic effects of neonicotinoid exposure on bumblebees. We show that exposure to clothianidin from seed-coated oilseed rape reduces bumblebee size and numbers, particularly of reproductives. However, exposure does not affect the levels of non-pathogenic bacteria or viruses, nor induce rises in the levels or virulence of intracellular parasites. We conclude that field exposure to the neonicotinoid clothianidin affects bumblebee performance but generally not their pathogenic or beneficial microbiota.


External organisations
  • INRA National Institute of Agricultural Research
  • Chizé Centre for Biological Studies
  • Martin-Luther-Universität Halle-Wittenberg
  • Helmholtz Centre for Environmental Research
  • Uppsala University
  • Swedish University of Agricultural Sciences
  • University of California, Davis
  • University of La Rochelle
  • Swedish Board of Agriculture
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Environmental Sciences related to Agriculture and Land-use
Original languageEnglish
Article number5446
JournalNature Communications
Issue number1
Publication statusPublished - 2018
Publication categoryResearch