William M. TonnWilliam M. TonnProfessor
Mailing address: Department of Biological Sciences, University of Alberta,
Edmonton, Alberta, Canada, T6G 2E9
Office Number: Z1008 Bio Sciences
Email address: bill.tonn@ualberta.ca
Fax address: (780) 492-9234
Phone Number: (780) 492-4162
Environmental Biology and Ecology, Systematics and Evolution.
How does environmental harshness, natural disturbances, and human influences impact northern aquatic ecosystems? For > 16 years, my graduate students and I have been investigating a diverse range of questions concerning the ecology of fishes, and the food webs of which they are a part, in boreal and sub-arctic lakes and rivers in northern Alberta and adjacent portions of the NWT. Additional work has been conducted in lakes and ponds in Finland and Sweden, and in the Arctic Ocean. The scale of studies has ranged from a focus on individual feeding or reproductive behavior, to landscape-level influences on the structure of aquatic communities, and has included both "pure" and applied research.
Beaudoin, C.P., E.E. Prepas, W.M. Tonn, L.I. Wassenaar, and B.G. Kotak. in press. A stable carbon and nitrogen isotope study of lake food webs in Canada's Boreal Plain. Freshwater Biology.
Prepas, E.E., D. Planas, J.J. Gibson, D.H. Vitt, T.D. Prowse, W.P. Dinsmore, L.A. Halsey, P.M. McEachern, S. Paquet, G.J. Scrimgeour, W.M. Tonn, C.A. Paszowski, and K. Wolfstein. in press. Landscape variables influencing nutrients and phytoplankton communities in Boreal Plain lakes of northern Alberta: a comparison of wetland- and upland- dominated catchments. Canadian Journal of Fisheries and Aquatic Sciences.
Scrimgeour, G.J., W.M. Tonn, C.A. Paszkowski and C. Goater, 2001. Benthic macroinvertebrate biomass and wildfires: evidence for enrichment of boreal subarctic lakes. Freshwater Biology 46: 367-378.
Scrimgeour, G.J., W.M. Tonn, C.A. Paszkowski and P.M.K. Aku. 2000. Evaluating the effects of forest harvesting on littoral benthic communities within a natural disturbance-based management model. Forest Ecology and Management 126:77-86.
Howland, K.L., R.F. Tallman and W.M. Tonn. 2000. Migratory patterns of freshwater and anadromous inconnu in the Mackenzie River system. Transactions of the American Fisheries Society 129:41-59.
Paszkowski, C.A. and W.M. Tonn. 2000. Community concordance between fishes and aquatic birds of northern Alberta lakes: the relative importance of environmental and biotic factors. Freshwater Biology 43:421-437.
Paszkowski, C.A. and W.M. Tonn. 2000. Effects of lakes size and fish assemblage on species richness of aquatic birds. Proceedings of the International Association of Theoretical and Applied Limnology 27:178-182.
Beaudoin, C.P., W.M. Tonn, E.E. Prepas and L.I. Wassenaar. 1999. Individual specialization and trophic adaptability of northern pike (Esox lucius): an isotope and dietary analysis. Oecologia 120:386-396.
Aku, P.M.K. and W.M. Tonn. 1999. Effects of hypolimnetic oxygenation on the food resources and feeding ecology of cisco in Amisk Lake, Alberta. Transactions of the American Fisheries Society 128:17-30.
Magnuson, J.J., W.M. Tonn, A. Banerjee, J. Toivonen, O. Sanchez, and M. Rask. 1998. Isolation versus extinction in the assembly of fishes in small northern lakes. Ecology 79: 2941-2956.
Little, A.S., W.M. Tonn, R.F. Tallman, and J.D. Reist. 1998. Seasonal variation in diet and trophic relationships within the fish communities of the lower Slave River, Northwest Territories, Canada. Environmental Biology of Fishes 53:429-445.
Hop, H. and W.M. Tonn. 1998. Gastric evacuation rates and daily rations of Arctic cod (Boreogadus saida) at low temperatures. Polar Biology 19:293-301.
Sellers, T.J., B. Parker, D.W. Schindler, and W.M. Tonn. 1998 . Pelagic distribution of lake trout (Salvelinus namaycush) in small Canadian Shield lakes with respect to temperature, dissolved oxygen, and light. Canadian Journal of Fisheries and Aquatic Sciences 54:170-179.
Aku, P.M.K. and W.M. Tonn. 1997. Changes in population structure, growth, and biomass of cisco (Coregonus artedi) during hypolimnetic oxygenation of a deep eutrophic lake, Amisk Lake, Alberta. Canadian Journal of Fisheries and Aquatic Sciences 54:2196-2206.
Aku, P.M.K., L.G. Rudstam and W.M. Tonn. 1997. Impact of hypolimnetic oxygenation on the vertical distribution of cisco (Coregonus artedi) in Amisk Lake, Alberta. Canadian Journal of Fisheries and Aquatic Sciences 54:2182-2195.
Prepas, E.E., K.M. Field, T.P. Murphy, W.L. Johnson, J.M. Burke, and W.M. Tonn. 1997. Introduction to the Amisk Lake Project: oxygenation of a deep eutrophic lake. Canadian Journal of Fisheries and Aquatic Sciences 54:2105-2110.
Hop, H., W.M. Tonn, and H.E. Welch. 1997. Bioenergetics of Arctic cod (Boreogadus saida) at low temperatures. Canadian Journal of Fisheries and Aquatic Sciences 54:1772-1784.
Holopainen, I.J., W.M. Tonn, and C.A. Paszkowski. 1997. Tales of two fish: the dichotomous biology of crucian carp (Carassius carassius (L.)) in northern Europe. Annales Zoologici Fennici 34:1-22.
Paszkowski, C.A., O-P. Penttinen, I.J. Holopainen, and W.M. Tonn. 1996. Predation risk and feeding patterns of crucian carp. Journal of Fish Biology 48:818-828.
Tonn, W.M., R.E. Vandenbos and C.A. Paszkowski. 1995. Habitat on a broad scale: relative importance of immigration and extinction for small lake fish assemblages. Bulletin Francais de la Pêche et de la Pisciculture 337/338/339:47-61.
Greenberg, L.A., C.A. Paszkowski and W.M. Tonn. 1995. Effects of prey species composition and habitat structure on foraging by two functionally distinct piscivores. Oikos 74:522-532.
Brönmark, C., C.A. Paszkowski, W.M. Tonn and A. Hargeby. 1995. Predation as a determinant of size structure in populations of crucian carp (Carassius carassius) and tench (Tinca tinca). Ecology of Freshwater Fish 4: 85-92.
Aku, P.M.K and W.M. Tonn. 1995. Changes in density and biomass of cisco (Coregonus artedi) in a lake undergoing hypolimnetic oxygen injection. Archiv für Hydrobiologie Special Issues Advances in Limnology 46:453-464.