Dr. John M. Fryxell
Office: SCIE 2461
Lab: SCIE 2405/06
B.Sc. - Britsh Columbia 1977
Ph.D. - British Columbia 1985
My research focuses on the effects of behavioural decisions by terrestrial mammals on population dynamics and community structure. A mix of theoretical and empirical approaches is used to consider the dynamics of specific systems. Theoretical questions of interest include herbivore migration in relation to resource use and predation risk, carnivore and herbivore spatial distribution in relation to resource use and predation risk, optimal diet and patch selection in heterogeneous environments, and the effect of social interference and territoriality on predator-prey interactions.
Empirical work is currently underway in several systems: wildebeest and Thomson's gazelles in Serengeti National Park (Tanzania), elk in Banff National Park (Canada), elk in Bancroft, Ontario (Canada), plains bison in Prince Albert National Park (Canada), mustelid carnivores in Red Lake, Ontario (Canada), and small mammals in Algonquin Provincial Park, Ontario (Canada). Theoretical models are used to assess the dynamic implications of behavioural strategies associated with trophic interactions. This mixture of experimental data and model predictions is compared with long-term observational data to interpret temporal dynamics and community structure of free-living plant and mammal communities in natural reserves. Research on landscape determinants of elk movements is currently underway with Dr. Daniel Haydon.
Holdo, R. M., Fryxell, J. M., Sinclair, A.R.E., Dobson, A., Holt, R. D. (2011), Predicted Impact of Barriers to Migration on the Serengeti Wildebeest Population. PLoS ONE 6(1): e16370. doi:10.1371/journal.pone.0016370.
Dalziel, B.D., Morales, J.M., Fryxell, J.M., Fitting Dynamic Models to Animal Movement Data: The Importance of Probes for Model Selection, a Replay to Franz and Caillaud. The American Naturalist,Vol. 175, 6, June 2010
Sinclair, A.R.E., Metzger, K., Brashares, J.S., Nkwabi, A., Sharam, G., Fryxell, J.M., Trophic Cascades in African Savanna: Serengeti as a Case Study, Tropic Cascades (Terborgh et all, eds), Island Press, pages 255-274, (2010).
Yott, A., Rosatte, R. Schaefer, J.A., Hamr,J., Fryxell, J.M., Movement and Spread of a Founding Population of Reintroduced Elk, (Cervus elaphus) in Ontario, Canada, Society for Ecological Restorartion International, doi: 10.1111/j.1526-100X.2009.00639.x
Holdo, Ricardo M., Holt, Robert D., Fryxell, John M. Opposing Rainfall and Plant Nutritional Gradients Best Explain the Wildebeest Migration in the Serengeti. The American Naturalist, Vol. 173 (4), April 2009.
Dalziel, B.D., Morales, J.M., & Fryxell, J.M. (2008). Fitting Probability Distributions to Animal Movement Trajectories: Using Artificial Neural Networks to Link Distance, Resources, and Memory. The American Naturalist, Vol. 172, No.2., pp.248-258.
Haydon, D.T., Morales, J.M., Yott, A., Jenkins, D.A., Rosatte, R. & Fryxell, J.M. (2008). Socially informed random walks: incorporating group dynamics into models of population spread and growth. Proc. R. Soc. B 275, pp: 1101-1109.
Thompson, I.D., Maher, S.C., Rouillard, D.P., Fryxell, J.M., Baker, J.A. (2007). Accuracy of forest inventory mapping: Some Implcations for boreal forest managment. Forest Ecology and Management 252, pp 208-221.
A.R.E. Sinclair, S.A.R. Mduma, J.G.C. Hopcraft, J.M. Fryxell,R. Hilborn, and S. Thirgood. (2007). Long-Term Ecosystem Dynamics in the Serengeti: Lessons for Conservation. Conservation Biology Volume 21, No. 3, 580–590.
Thirgood, S.J., A. Mosser, S. Tham, J.G.C. Hopcraft, E. Mwangomo, T. Mlengeya, M. Kilewo, J.M. Fryxell, A.R.E. Sinclair, and M. Borner. 2004. Can parks protect migratory ungulates? The case of the Serengeti-Mara wildebeest. Animal Conservation 7: 113–120.
Boyce, M.S., J.S. Mao, E.H. Merrill, D. Fortin, M.G. Turner, J. Fryxell, and P. Turchin. 2003. Scale and hetergeneity in habitat selection by elk in Yellowstone National Park. Ecoscience 10(4):421-431.
Vlasman, K.L. and J.M. Fryxell. 2003. Seasonal changes in territory use by red squirrels, Tamiasciurus hudsonicus, and responses to food augmentation. Canadian Journal of Zoology 80:1957-1965.
Fortin, D., J.M. Fryxell, L. O’Brodovich, and D. Frandsen. 2003. Foraging ecology of bison at the landscape and plant community levels: the applicability of energy maximization principles. Oecologia 134:219-227.
Fryxell, J.M., C. Bergman, D. Fortin, and J. Wilmshurst. 2001. On the scale dependence of foraging in terrestrial herbivores. Proceedings of XIX International Grasslands Congress. Pages 271-275 in Proceedings of XIX International Grasslands Congress (Gomide, J.A., W. Mattos, and S.C. da Silva, eds), FEALQ, Sao Pedro, Brazil, 1097 pp.
Sinclair, A.R.E., C.J. Krebs, J.M. Fryxell, R. Turkington, S. Boutin, R. Boonstra, P. Seccombe Hett, P. Lundberg, and L. Oksanen. 2000. Testing hypotheses of trophic level interactions: a boreal forest ecosystem. Oikos 89:313-328.
Bergman, C.M., J.M. Fryxell, and C.C. Gates. 2000. The effect of tissue complexity and sward height on the functional response of wood bison. Functional Ecology 14: 61-69.
Donkor, N.T. and J.M. Fryxell. 2000. Lowland boreal forest characterization in Algonquin Provincial Park relative to beaver (Castor canadensis) foraging and edaphic factors. Plant Ecology 148: 1-12.
BIOL*3110 Population Ecology
BIOL*4150 Wildlife Conservation and Management
ZOO*4410 Field Ecology
Avgar, Tal (PhD)
Kittle, Andrew (PhD)
Kuefler, Daniel (PhD)
Moffatt, Scott (MSc)
Shuter, Jennifer (PhD)*
Wiebe, Philip (MSc)
*Co-advised by Tom Nudds
Anderson, Morgan (MSc)