The Trojan hives: pollinator pathogens, imported and distributed in bumblebee colonies

Peter Graystock, Kathryn Yates, Sophie E. F. Evison, Ben Darvill, Dave Goulson, William O. H. Hughes*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

116 Citations (Scopus)

Abstract

Over a million commercially produced bumblebee colonies are imported annually on a global scale for the pollination of greenhouse crops. After importation, they interact with other pollinators, with an associated risk of any parasites they carry infecting and harming native bees. National and supranational regulations are designed to prevent this, and commercially produced bumblebee colonies are accordingly now often sold and imported as being parasite-free. Here, we used molecular methods to examine the occurrence of parasites in bumblebee colonies that were commercially produced in 2011 and 2012 by three producers. We then used controlled experiments to determine whether any parasites present were infectious. We found that 77% of the commercially produced bumblebee colonies from the three producers, which were imported on the basis of being free of parasites, in fact carried microbial parasites, with five different parasites being detected across the total sample of bumblebees and a further three in the pollen supplied with the colonies as food. Our controlled experiments demonstrated that at least three of these parasites were infectious to bumblebees with significant negative effects on their health. Furthermore, we also found that at least four of the parasites carried by commercially produced bumblebees were infectious to honeybees, indicating that they pose a risk to other pollinators as well.Synthesis and applications. The results demonstrate that commercially produced bumblebee colonies carry multiple, infectious parasites that pose a significant risk to other native and managed pollinators. More effective disease detection and management strategies are urgently needed to reduce the pathogen spillover threat from commercially produced bumblebees.

The results demonstrate that commercially produced bumblebee colonies carry multiple, infectious parasites that pose a significant risk to other native and managed pollinators. More effective disease detection and management strategies are urgently needed to reduce the pathogen spillover threat from commercially produced bumblebees.

Original languageEnglish
Pages (from-to)1207-1215
Number of pages9
JournalJournal of Applied Ecology
Volume50
Issue number5
DOIs
Publication statusPublished - Oct 2013

Keywords

  • Bombus
  • commercial bumblebee production
  • pathogen spillover
  • pollinator conservation
  • WORLDWIDE MIGRATION
  • PARASITE PREVALENCE
  • WILD BUMBLEBEES
  • NOSEMA-BOMBI
  • BEE
  • SPILLOVER
  • COMMERCIALIZATION
  • TRANSMISSION
  • DECLINES
  • CONSERVATION

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