Search
Skip to Search Results- 12Spence, J. R.
- 4Langor, D. W.
- 2Bergeron, J. A. C.
- 2Bourassa, S.
- 2Digweed, S. C.
- 2Sperling, F. A. H.
- 10Renewable Resources, Department of
- 7Renewable Resources, Department of/Conference Proceedings (Renewable Resources)
- 3Renewable Resources, Department of/Journal Articles (Renewable Resources)
- 2Biological Sciences, Department of
- 2Biological Sciences, Department of/Journal Articles (Biological Sciences)
- 1Graduate and Postdoctoral Studies (GPS), Faculty of
-
1990
Sperling, F. A. H., Spence, J. R.
Five species of Limnoporus Stål (L. canaliculatus [Say], L. dissortis [Drake and Harris], L. nearcticus [Kelton], L. notabilis [Drake and Hottes], and L. rufoscutellatus [Latreille]) were each sampled at 20 electrophoretic loci. Twofold differences among species in mean heterozygosity appear to...
-
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,...
-
Carabid Assemblages (Coleoptera: Carabidae) in a Rotation of Three Different Crops in Southern Alberta, Canada: A Comparison of Sustainable and Conventional Farming
Download2008
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...
-
Conservation of forest-dwelling arthropod species: simultaneous management of many small and heterogeneous risks
Download2008
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...
-
Current status of invasive alien birch-leafmining sawflies (Hymenoptera: Tenthredinidae) in Canada, with keys to species
Download2009
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...
-
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...
-
Landscape patterns of species-level association between ground-beetles and overstory trees in boreal forests of western Canada (Coleoptera, Carabidae)
Download2011
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...
-
Low intensity surface fire instigates movement by adults of Calosoma frigidum (Coleoptera, Carabidae)
Download2011
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,...