Gretchen Hansen

smiling woman in field
Assistant Professor
[email protected]
612-624-4228
B50 Skok Hall
Hansen website
Education

Ph.D. University of Wisconsin-Madison

M.S. Michigan State University

B.S. University of Wisconsin-Madison

Areas of Interest

Fisheries Ecology

Teaching

ESPM 3925 - Science in the Information Age

FW 2001W: Introduction to Fisheries, Wildlife, and Conservation Biology

Research

Climate change, long-term trends in fish populations, aquatic invasive species, food webs/community dynamics, landscape models of fish habitat, and adaptive management.

My research focuses on pattern and process in aquatic communities and ecosystems. I employ statistical analyses of historical data, observational field studies, simulation modeling, and large-scale experimentation to answer applied science questions in a real world context. 

Select Publications

SELECTED PUBLICATIONS: (*post-doctoral researcher, **graduate student, †undergraduate student)

Wagner, T, EM Schliep, JS North**, H Kundel**, CA Custer**, JKR Nelson, GJA Hansen. 2023. Predicting climate change impacts on poikilotherms using physiologically guided species abundance models. Proceedings of the National Academy of Sciences 120 (15): e2214199120, https://doi.org/10.1073/pnas.22141991

Vitense, K.* and GJA Hansen. 2023. Non-linear water clarity trends and impacts on littoral area in Minnesota lakes. Limnology and Oceanography Letters 8:657-665. https://doi.org/10.1002/lol2.10323

Mahlum*, S, K Vitense*, H Corson-Dosch, L Platt, PJ Schmalz, M Treml, and GJA Hansen. 2023. Connecting habitat to species abundance: the role of light and temperature in the abundance of walleye in lakes. Canadian Journal of Fisheries and Aquatic Sciences. 80: 273-286.| dx.doi.org/10.1139/cjfas-2022-0109  

Willard, JD**, JS Read, S Topp, GJA Hansen. V Kumar. 2022. Daily surface temperatures for 185,549 lakes in the conterminous United States estimated using deep learning (1980–2020). Limnology and Oceanography Letters, 7(4), 287-301. doi: 10.1002/lol2.10249

Hansen, GJA, KE Wehrly, K Vitense*, JR Walsh*, PC Jacobson. 2022. Quantifying the resilience of coldwater lake habitat to climate and land use change to prioritize watershed conservation. Ecosphere, 13(7). http://dx.doi.org/10.1002/ecs2.4172 10.1002/ecs2.4172

Hansen, GJA, J Ruzich, CA Krabbenhoft*, H Kundel**, S Mahlum*, CI Rounds**, AO Van Pelt†, LD Eslinger, DR Logsdon, DA Isermann. 2022. It’s complicated and it depends: A review of the effects of ecosystem changes on Walleye and Yellow Perch populations in North America. North American Journal of Fisheries Management 42:484-506. doi:10.1002/nafm.10741 

Hansen, GJA, TD Ahrenstorff, BJ Bethke, J Dumke, J Hirsch, KE Kovalenko, JF LeDuc, RP Maki, HM Rantala, T Wagner. 2020. Walleye growth declines following zebra mussel and Bythotrephes invasion. Biological Invasions 22:1481-1495. 

Hansen, GJA, LA Winslow, JS Read, M Treml, PJ Schmalz, and SR Carpenter. 2019. Water clarity and temperature effects on walleye safe harvest: an empirical test of the safe operating space concept. Ecosphere 10(5): e02737. 10.1002/ecs2.2737

Hansen, GJA, JS Read, JF Hansen, LA Winslow. 2017. Projected shifts in sport fish species dominance in Wisconsin lakes under climate change. Global Change Biology 23: 1463-1476. doi: 10.1111/gcb.13462

Hansen, GJA, JW Gaeta, JF Hansen, SR Carpenter. 2015. Learning to manage and managing to learn: sustaining freshwater recreational fisheries in a changing environment. Fisheries 40(2): 56-64.

Hansen, GJA, AR Ives, MJ Vander Zanden, SR Carpenter. 2013. Are rapid transitions between invasive and native species caused by alternative stable states, and does it matter? Ecology 94:2207–2219. http://dx.doi.org/10.1890/13-0093.1                                                                                              

Hansen, GJA, CL Hein, BM Roth, MJ Vander Zanden, JW Gaeta, AW Latzka, SR Carpenter. 2013. Food web consequences of long-term invasive crayfish control. Canadian Journal of Fisheries and Aquatic Sciences. 70: 1109-1122, http://dx.doi.org/10.1139/cjfas-2012-0460                                                                

Hansen, GJA, ML Jones. 2008. The value of information in fishery management. Fisheries 33: 340-348.