Do pathogen spillover, pesticide use, or habitat loss explain recent North American bumblebee declines?

Conservation Letters

Nora D. Szabo³  Sheila R. Colla¹  David L. Wagner⁴  Lawrence F. Gall² 

[1] Department of Biology, York University, Toronto, ON M3J 1P3, Canada;Peabody Museum of Natural History, Entomology Division, Yale University, New Haven, CT 06511, USA;Department of Biology, University of Ottawa, Ottawa, ON K1N 6N5, Canada;Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT 06269–3043, USA

关键词: Bombus;    disease;    habitat loss;    pathogen spillover;    pesticides;    pollinator declines;    range collapse;   

DOI  :  10.1111/j.1755-263X.2012.00234.x

来源: Wiley

【 摘 要 】

Abstract

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.

【 授权许可】

Unknown   
©2012 Wiley Periodicals, Inc.