Abstract
Abstract Four North American bumble bee species in the subgenus Bombus sensu stricto, including Bombus occidentalis (Hymenoptera: Apidae), are experiencing dramatic declines in population abundance, geographic range and genetic diversity. The prevailing hypothesis concerning their decline is the transmission of the intracellular fungal pathogen. Nosema bombi (Microsporida), and other pathogen species from commercially reared bumble bees to wild populations. While N. bombi incidence has been investigated in the contiguous U.S.A. and Canada, virtually nothing is known about the status of Alaskan bumble bees. This study presents the distribution and relative abundance of B. occidentalis and B. moderatus, two co-occurring species in the subgenus Bombus sensu stricto, in Alaska and the prevalence of N. bombi detected in these species. Bombus occidentalis and B. moderatus accounted for 28% and 4% of the 942 bumble bees surveyed, respectively. Bombus occidentalis was the most abundant species collected in the su...
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