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2011
Davidson, R. L., Rykken, J., Spence, J. R., Ball, G. E.
Abstract: The lives and contributions of Ross and Joyce Bell are described with particular attention to studies of invertebrate natural history in the state of Vermont and carabid beetles of several groups, including the world rhysodine fauna. Their work, all done at the University of Vermont,...
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Carabid Assemblages (Coleoptera: Carabidae) in a Rotation of Three Different Crops in Southern Alberta, Canada: A Comparison of Sustainable and Conventional Farming
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Larney, F.J., Spence, J. R., Bourassa, S., Carcamo, H.A.
Carabids were sampled in 2000 (pretreatment year) and 2003-2005 in experimental plots in southern Alberta. Canada, after a rotation of beans, and potato under sustainable and conventional farming practices. Each phase of the rotation was present in every year. Crop type had stronger effect than...
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Conservation of forest-dwelling arthropod species: simultaneous management of many small and heterogeneous risks
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Volney, W.J.A., Langor, D. W., Jacobs, J. M., Work, T. T., Spence, J. R.
The Canadian insect fauna is too inadequately Understood to support well-informed assessments about its conservation status: however, the foregoing collection of synthetic papers illustrates potential threats front industrial forestry. Loss of forest species and dramatic changes in forest insect...
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Current status of invasive alien birch-leafmining sawflies (Hymenoptera: Tenthredinidae) in Canada, with keys to species
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MacQuarrie, C. J. K., Nystrom, K. L., Langor, D. W., Digweed, S. C., Williams, D. J. M., Morneau, L., Spence, J. R.
Abstract: In the 20th century, five species of birch-leafmining sawflies were inadvertently introduced from Europe to North America: Heterarthrus nemoratus (Fallen), Fenusa pumila Leach, Profenusa thomsoni (Konow), Fenusella nana (Klug), and Scolioneura vicina Konow. All have been recorded at...
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2008
Hebert, C., Koivula, M., Langor, D.W., Sweeney, J., Spence, J. R., Klimaszewski, J., Work, T.T.
Our objective was to assess the potential of carabid beetles (Coleoptera: Carabidae) as effective bioindicators of the effects of forest management at a Canadian national scale. We present a comparison of carabid beetle assemblages reported from large-scale Studies across Canada. Based on the...
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Landscape patterns of species-level association between ground-beetles and overstory trees in boreal forests of western Canada (Coleoptera, Carabidae)
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Spence, J. R., Volney, W. J. A., Bergeron, J. A. C.
Abstract: Spatial associations between species of trees and ground-beetles (Coleoptera: Carabidae) involve many indirect ecological processes, likely reflecting the function of numerous forest ecosystem components. Describing and quantifying these associations at the landscape scale is basic to...
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Low intensity surface fire instigates movement by adults of Calosoma frigidum (Coleoptera, Carabidae)
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Jacobs, J. M, Work, T. T., Spence, J. R., Bergeron, J. A. C.
Abstract: The genus Calosoma (Coleoptera: Carabidae) is a group of large, sometimes ornate beetles, which often voraciously attack caterpillars. Many studies have reported Calosoma beetles being highly conspicuous during defoliator outbreaks. Based on observations of individual beetle behavior,...
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Spider assemblages in the overstory, understory, and ground layers of managed stands in the western boreal mixedwood forest of Canada
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Langor, D. W., Spence, J. R., Pinzon, J.
Abstract: Logging is the main human disturbance in the boreal forest; thus, understanding the effects of harvesting practices on biodiversity is essential for a more sustainable forestry. To assess changes in spider composition because of harvesting, samples were collected from three forest...
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Wing-dimorphism and population expansion of Pterostichus melanarius (Illiger, 1798) at small and large scales in central Alberta, Canada (Coleoptera, Carabidae, Pterostichini)
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Hartley, D. J., Lee, S.-I., Bourassa, S., Spence, J. R.
Abstract: A study spanning ten years revealed changes in wing-morph ratios corroborating the hypothesis that the wing-dimorphic introduced carabid, Pterostichus melanarius Ill., is spreading through flight, from the city of Edmonton, Canada and establishing populations in natural aspen forest of...