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Monday, January 29 • 1:40pm - 2:00pm
SYMPOSIA-05: A Herculean Task: Reversing Lake Eutrophication

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AUTHORS. Catherine L. Hein, Wisconsin Department of Natural Resources

ABSTRACT. Eutrophication impacts 35-40% of lakes in the U.S. and threatens fish and other aquatic life. Cold water fish are especially at risk due to deoxygenation of cool waters at depth. Unfortunately, efforts to restore lakes plagued by nutrient pollution fail more often than succeed. Despite large investments in restoration, water quality in most Midwestern lakes, though not worsening, is not improving over time. I will review techniques for improving lake water quality, including practices that reduce external nutrient loads, treatments that target internal nutrient loads, and biomanipulation. This review will attempt to unpack why theoretically sound management actions do not always lead to improvement and will offer guidelines to increase the odds of success. For example, extreme precipitation events and human behavior must be addressed when implementing restoration efforts. Finally, I will end with a few case studies that exemplify how partnerships between communities and agencies combined with perseverance can overcome lake eutrophication.

Monday January 29, 2018 1:40pm - 2:00pm CST