Timothy Ehlinger

Associate Professor
 (414) 229-4358
 Lapham Hall 493


  • Postdoctoral Fellow, University of Toronto, 1989-90
  • Postdoctoral Fellow, Kellogg Biological Station, 1987- 88
  • PhD, Michigan State University, 1986
  • MSc, Northwestern University, 1981
  • BA, Northwestern University, 1980


Research Interests

My basic research examines the cause and effect relationships betwen human-induced stressors and the ecological integrity of lakes, streams and rivers. Our work incorporates landscape and watershed level processes, as well as detailed investigations of the habitat requirements, ecology and reproduction of fishes and aquatic invertebrates. These projects are often linked to the restoration or remediation of damaged ecosystems.

We are also involved in cross-disciplinary collaborations for the design and implementation of sustainable development strategies. Since 2001, I have been working closely with collaborators in Romania and Costa Rica using watershed ecology as a foundation for planning sustainable development. A central aspect of the international work includes partnerships with Universities and Research Institutes in Constanta, Romania and in Thessaloniki, Greece.

Selected Publications

Schaefer, Wayne, Schmitz, Mark, Blazer, Vicki, Ehlinger, Timothy J., and Berges, John A. “Seasonal variation in the abundance of sandercyanin, a novel blue pigment in the mucus of walley (Sander vitreus) in northwestern Ontario, Canada.” Can. J. Fish. Aquat. Sci. 72. (2014): 1-9.
Novotny, V., O’Reilly, N., Ehlinger, Timothy J., Frevert, T., and Twait, S. “A river is reborn – Use Attainability Analysis for the Lower Des Plaines River, Illinois.” Water Environment Research 79.1 (2007): 68-80.
Shaker, R. R., and Ehlinger, Timothy J. Technical Report #11 Agricultural land fragmentation and biological integrity: the impacts of rapidly changing landscape on streams in Southeastern Wisconsin. 2007.
Novotny, V., Ehlinger, Timothy J., Manolakos, E., Bartosova, A., O’Reilly, N., Bedoya, D., McGarvey, K., Brooks, J., Beach, D., Farah, J., and Shaker, R. Technical Report # 15. Final Report. Developing Risk Propagation Model for Estimating Ecological Responses of Streams to Anthropogenic Watershed Stresses and Stream Modifications. 2007.
Fayram, A., Hansen, M. J., and Ehlinger, Timothy J. “Influence of walleye stocking on angler effort in Wisconsin.” Human Dimensions of Wildlife 11.2 (2006).
Fayram, A. H., Hansen, M. J., and Ehlinger, Timothy J. “Characterizing changes in maturity of lakes resulting from supplementation of walleye populations.” Ecological Modelling 197.1-2 Ed. Ehlinger, Timothy J. (2006): 103-115.
Novotny, V., Bartosová, A., O’Reilly, N., and Ehlinger, Timothy J. “Unlocking the relationship of biotic integrity of impaired waters to anthropogenic stresses.” Journal of Water Research 39.1 (2005): 184-198.