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Abundance and species of Bumble Bees (Hymenoptera: Apoidea: Bombinae) in fields of canola, Brassica rapa L., in Manitoba: an 8-year record

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Title: Abundance and species of Bumble Bees (Hymenoptera: Apoidea: Bombinae) in fields of canola, Brassica rapa L., in Manitoba: an 8-year record
Author: Turnock, W.J.; Kevan, Peter G.; Laverty, T.M.; Dumouchel, L.
Abstract: Bumble bees, Bombus spp., were inadvertently captured in Unitraps® baited with a bertha armyworm (Mamestra configurata Wlk.) sex attractant placed in fields of canola (oilseed rape, Brassica rapa L.) in four regions within the agricultural zone of Manitoba, 1986-1993. Bombus rufocinctus Cresson and B. borealis Kirby were the most abundant species, occurring in all four regions. Another 13 species were much less abundant. Species diversity and number of captures were greatest in the northwestern region (Swan River Valley), and least in the southeast (Red River Valley), coinciding with the amount of native vegetation in the region. Captures of Bombus spp. were largest in 1989, with smaller peaks in 1992, 1986, and 1993. The patterns of abundance among regions were very similar among years, suggesting that the abundance of bumble bees is controlled by weather–related factors, even though analyses of the temperature and precipitation during summer, winter, and the spring periods when queens are establishing new colonies did not reveal any relationships.
URI: http://hdl.handle.net/10214/2425
Date: 2007
Citation: Turnock, W.J., Kevan, Pe. G., Laverty, T.M., and Dumouchel, L. "Abundance and species of Bumble Bees (Hymenoptera: Apoidea: Bombinae) in fields of canola, Brassica rapa L., in Manitoba: an 8-year record." Journal of the Entomological Society of Ontario 137 (2006): 31-40


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