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Nutrient pollution in lakes and rivers is one of the greatest threats to our water resources. Impacts from agriculture, human activities, and wastewater contribute excessive amounts of nitrogen and phosphorus, which allow productivity of aquatic plants and algae to increase. This leads to trophic shifts that result in impaired water quality, enhanced aquatic plant growth, and harmful algal blooms. This webinar will detail one such case study of a series of interconnected lakes and managers trying to identify the cause of their rapidly worsening harmful algal blooms. An investigation which spanned from Native American settlements through modern times was used to pinpoint the source of nutrient pollution, guide source removal, and monitor ecosystem recovery.