USGS - science for a changing world

U.S. Geological Survey - Great Lakes Science Center

Mary Evans


Research Ecologist Great Lakes Science Center Email: Phone: (734) 214-7221 Fax: (734) 994-3331 Professional Page:

Current Studies

Western Lake Erie, River Influence And Harmful Algal Blooms (HABs)

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...

Principal Investigator: Mary Evans
Coastal Eutrophication and Hypoxia Modeling: Forecasting and Cross-System Comparison

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.

Principal Investigator: Mary Evans

Recent Publications

Gerald Matisoff, Eliza M. Kaltenberg, Rebecca L. Steely, Stephanie K. Hummel, Jinyu Seo, Kenneth J. Gibbons, Thomas B. Bridgeman, Youngwoo Seo, Mohsen Behbahani, William F. James, Laura T. Johnson, Phuong Doan, Maria Dittrich, Mary Anne Evans, and Justin D. Chaffin 2016. Internal loading of phosphorus in western Lake Erie. Elsevier . Journal of Great Lakes Research . 42 (4). 775-788.
Contribution #2016
Mary Anne Evans 2016. Graphical Function Mapping as a New Way to Explore Cause-and-Effect Chains. Taylor & Francis . Fisheries . 41 (11). 638-643.
Contribution #1989
Scavia, Donald, J. David Allan, Kristin K. Arend, Steven Bartell, Dmitry Beletsky, Nate S. Bosch, Stephen B. Brandt, Ruth D. Briland, Irem Daloglu, Joseph V. DePinto, David M. Dolan, Mary Anne Evans, Troy M. Farmer, Daisuke Goto, Haejin Han, Tomas O. Hook, Roger Knight, Stuart A. Ludsin, Doran Mason, Anna M. Michalak, R. Peter Richards, James J. Roberts, Daniel K. Rucinski, Edward Rutherford, David J. Schwab, Timothy M. Sesterhenn, Hongyan Zhang, Yuntao Zhou 2014. Assessing and addressing the re-eutrophication of Lake Erie: Central basin hypoxia. journal of Great Lakes Research . 40 (2). 226-246.
Contribution #1830
Scavia, Donald, Mary Anne Evans, and Daniel R. Obenour. 2013. A scenario and forecast model for Gulf of Mexico hypoxic area and volume. Environmental Science & Technology . 47 (18). 10423-10428.
Contribution #1776

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