Dr. Gretchen Hansen

Assistant Professor


Dr. Gretchen Hansen is an assistant professor in the Fisheries, Wildlife, and Conservation Biology Department at the University of Minnesota. Her research focuses on large scale drivers of change in freshwater ecosystems, including climate, land use, and invasive species. She is especially interested in how local management and lake characteristics influence the resilience of fish populations and communities to regional and global change. Gretchen previously worked as a research scientist for state fisheries management agencies, and is committing to conducting actionable science via collaboration with stakeholders and managers. To answer complex questions she employs multiple approaches including statistical analyses of historical data, observational field studies, simulation modeling, and large-scale experimentation.


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

Current projects

Select AIS publications

  • Projected shifts in fish species dominance in Wisconsin lakes under climate change. Global Change Biology, 2016
  • Predicting walleye recruitment as a tool for prioritizing management actions. Canadian Journal of Fisheries and Aquatic Sciences, 2015
  • Food web consequences of long-term invasive crayfish control. Canadian Journal of Fisheries and Aquatic Sciences, 2013
  • A Framework for Evaluating Heterogeneity and Landscape-Level Impacts of Non-native Aquatic Species. Ecosystems, 2017

Gretchen Hansen

Research team