Harmful algal blooms (HABs) of Microcystis species are a growing problem in western Lake Erie (Bridgman et al. 2012, Stumpf et al. 2012) and this problem is predicted to worsen with expected changes in regional climate (Michalak et al, 2013). Microcystis and related HABs are a management concern for many lake resource users because they can generate human and animal toxins; taste and odor problems in drinking water; as well as aesthetics and health issue for beach goers, boaters, and recreational anglers. Two complimentary societal responses to HABs have been recommended, mitigation (actions to reduce bloom size and frequency) and adaptation (actions to reduce the impacts of blooms when they occur). HAB mitigation is the subject of several ongoing studies...
Recent improvements in geostatistical data interpolation have led to the reanalysis of historical hypoxia cruise data for the Gulf of Mexico (Obenour et al. in prep) and Lake Erie (Zhou et al. in press), resulting in new time series of hypoxic extent with improved accuracy and quantified uncertainty. The reanalysis for the Gulf of Mexico revealed that at least some of the historically recognized hypoxia sensitivity changes in the original data-set can be explained by an instrument artifact (Obenour et al. in prep) and prior hypoxia estimates for Lake Erie did not include a consistent measure of extent. There is thus a pressing need to revisit models, conclusions, and management recommendations based on the historical data-set in light of this reanalysis. An accurate understanding of these systems is important both because they are each the subject of management concern in their own right and because they provide a basis for developing general indicators of hypoxia sensitivity to nutrient loading that can be applied to other systems.