Editor Pablo Marquet
Do pathogen spillover, pesticide use, or habitat loss explain recent North American bumblebee declines?
Version of Record online: 10 APR 2012
©2012 Wiley Periodicals, Inc.
Volume 5, Issue 3, pages 232–239, June 2012
How to Cite
Szabo, N. D., Colla, S. R., Wagner, D. L., Gall, L. F. and Kerr, J. T. (2012), Do pathogen spillover, pesticide use, or habitat loss explain recent North American bumblebee declines?. Conservation Letters, 5: 232–239. doi: 10.1111/j.1755-263X.2012.00234.x
- Issue online: 15 JUN 2012
- Version of Record online: 10 APR 2012
- Accepted manuscript online: 19 MAR 2012 07:03AM EST
- Received , 5 October 2011, Accepted, 5 March 2012
- habitat loss;
- pathogen spillover;
- pollinator declines;
- range collapse
Several North American bumblebee species have recently undergone dramatic declines. The use of managed, pathogen-carrying bumblebees for pollination of greenhouse crops began shortly before these declines, and wild bumblebees near greenhouses now have high pathogen loads. This has led to speculation that pathogen spillover from commercial bumblebees caused declines of these species. We test this hypothesis using a large dataset of bumblebee occurrence records and agricultural census data. We find support for the pathogen spillover hypothesis for two species but no evidence that pathogen spillover caused the near disappearance of the previously widespread Bombus affinis. Furthermore, we show that pesticide use and habitat loss are unlikely to be major causes of decline for any of the Bombus species examined. Collectively, our analyses underscore that there remains an urgent need to identify causes of pollinator population losses.