Timothy Bartley

Photo of Tim Bartley
Assistant Professor
SSC 3465
I am a food web ecologist studying the causes and consequences of food web reorganization with global environmental change.
Currently, I am a postdoctoral fellow at the University of Toronto Mississauga and the University of Guelph. I am integrating a range of empirical data, primarily from the Great Lakes and other aquatic ecosystems, to document how the organisms’ responses to global environmental change are ‘rewiring’ food webs. I am also developing theoretical models to explore how this food web rewiring impacts stability.
During my PhD, I examined the response of the whole lake food webs across the natural climate gradient in Ontario, Canada. By combining dietary data from both stable isotope analysis and molecular gut content analysis and inferring behaviour from catch-per-unit-effort data, I showed that whole fish communities in boreal shield lakes respond to increased temperature, producing flexible food web structure driven by rapid behavioral and feeding responses. These predictable responses of entire thermal guilds level to temperature imply a major reorganization of lake food webs with climate change.
  • B.Sc. – University of Guelph, 2008
  • Ph.D. – University of Guelph, 2017


  • Bartley, T. J., Braid, H. E., McCann, K. S., Lester, N. P., Shuter, B. J., & Hanner, R. H. (2015). DNA barcoding increases resolution and changes structure in Canadian boreal shield lake food webs. DNA Barcodes, 3(1), 30-43.
  • Kamenova, S., Bartley, T.J., Bohan, D., Boutain, J.R., Colautti, R.I., Domaizon, I., Fontaine, C., Lemainque, A., Le Viol, I., Mollot, G. and Perga, M.E. (2017). Invasions Toolkit: Current Methods for Tracking the Spread and Impact of Invasive Species. Advances in Ecological Research.