Gretchen Hansen, Assistant Professor


  • Postdoc, Fisheries, University of Wisconsin - Madison
  • PhD, Limnology & Marine Sciecne, University of Wisconsin - Madison
  • M.S., Fisheries & Wildlife, Michigan State University
  • B.S., Biology, University of Wisconsin - Madison

AIS Area of Interest

Dr. Hansen is interested in food web shifts, especially in sport fisheries, resulting from invasive invertebrates including spiny waterflea and zebra mussels.

AIS Species of Study

Current MAISRC projects

Select AIS publications

  • Hansen, G.J.A., Ahrenstorff, T.D., Bethke, B.J. et al. (2020). Walleye growth declines following zebra mussel and Bythotrephes invasionBiological Invasions.

  • Bajer, P., Ghosal, R., Maselko, M., Smanski, M., Lechelt, J., Hansen, G., & Kornis, M. (2019). Biological control of invasive fish and aquatic invertebrates: a brief review with case studies. Management of Biological Invasions, 10.

  • Hansen, G. J. A., Read, J. S., Hansen, J. F., & Winslow, L. A. (2016). Projected shifts in fish species dominance in Wisconsin lakes under climate change. Global Change Biology, 23(4), 1463–1476. doi:10.1111/gcb.13462

  • Hansen, G. J. A., Carpenter, S. R., Gaeta, J. W., Hennessy, J. M., & Vander Zanden, M. J. (2015). Predicting walleye recruitment as a tool for prioritizing management actions. Canadian Journal of Fisheries and Aquatic Sciences, 72(5), 661–672. doi:10.1139/cjfas-2014-0513

  • Hansen, G. J., Ives, A. R., Vander Zanden, M. J., & Carpenter, S. R. (2013). Are rapid transitions between invasive and native species caused by alternative stable states, and does it matter? Ecology, 94(10), 2207–2219. Retrieved from

  • Hansen, G. J. A., Hein, C. L., Roth, B. M., Vander Zanden, M. J., Gaeta, J. W., Latzka, A. W., & Carpenter, S. R. (2013). Food web consequences of long-term invasive crayfish control. Canadian Journal of Fisheries and Aquatic Sciences, 70(7), 1109–1122. doi:10.1139/cjfas-2012-0460

  • Vander Zanden, M. J., Hansen, G. J. A., & Latzka, A. W. (2017). A Framework for Evaluating Heterogeneity and Landscape-Level Impacts of Non-native Aquatic Species. Ecosystems, 20(3), 477–491. doi:10.1007/s10021-016-0102-z

Gretchen Hansen

Research team