Date of Award:
5-2011
Document Type:
Thesis
Degree Name:
Master of Science (MS)
Department:
Biology
Committee Chair(s)
James P. Pitts
Committee
James P. Pitts
Committee
James P. Strange
Committee
David N. Koons
Abstract
Several reports of North American bumble bee (Bombus Latreille) decline have been documented across the continent, but no study has fully assessed the geographic scope of decline. In this study I discuss the importance of Natural History Collections (NHC) in estimating historic bumble bee distributions and abundances, as well as in informing current surveys. To estimate changes in distribution and relative abundance I compare historic data assembled from a >73,000 specimen database with a contemporary 3-year survey of North American bumble bees across 382 locations in the contiguous U.S.A. Based on my results, four historically abundant bumble bees, B. affinis, B. occidentalis, B. pensylvanicus and B. terricola, have declined by 72 - 96% relative abundance across their native distribution, while B. bifarius, B. bimaculatus, B. impatiens, and B. vosnesenskii appear to be relatively stable. Finally, I provide some notes on the distribution, abundance, and frequency of Nosema bombi infections in Alaskan B. occidentalis.
Checksum
79e1e4f23b600e377dd506617c4015d5
Recommended Citation
Koch, Jonathan Berenguer, "The Decline and Conservation Status of North American Bumble Bees" (2011). All Graduate Theses and Dissertations, Spring 1920 to Summer 2023. 8321.
https://digitalcommons.usu.edu/etd/8321
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