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Tuesday, January 30 • 8:00am - 8:20am
SYMPOSIA-09: Modeling Oxythermal Stress of Cisco Across Midwest Lakes to Aid Management of Cold-Water Fish Habitat

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AUTHORS. Madeline Magee, University of Wisconsin-Madison, Center for Limnology; Andrew Rypel, Wisconsin Department of Natural Resources, University of California-Davis, Department of Wildlife, Fish, & Conservation Biology; Jordan Read, US Geological Survey, Water Science Center; Peter McIntyre, University of Wisconsin-Madison, Center for Limnology

ABSTRACT. Climate changes have caused significant loss of biodiversity and changes in species distribution in lakes. In Wisconsin, habitat of cold- and cool-water fish within a lake is constrained by both water temperature and dissolved oxygen, typically forcing these fish into deep waters during summer. Warming has further squeezed the available thermal habitat within many lakes, and also fostered prolonged periods of low oxygen in the bottom waters. At times, suitable habitat is lost entirely from a lake. To develop effective management strategies, it is important to understand how this habitat squeezing varies among lakes as air temperatures continue to rise. Previous efforts have modeled this oxythermal habitat in a single lake, but translating lake-specific models to large numbers of lakes across the landscape has been limited. Furthermore, modeling efforts must focus on providing management-relevant information to prove useful in the long-term. Here we describe a new lake modeling effort aimed at understanding how ongoing warming will further reduce habitat of cold-water cisco (Coregonus artedi) across Midwestern lakes. We forecast changes in oxythermal habitat under future climate conditions, as well as identifying lakes where management of nutrient loads and forest cover may feasibly offset warming to protect suitable habitat for cold-water species into the future.

Tuesday January 30, 2018 8:00am - 8:20am CST