Dr. Krieger assumed the role of director of the National Center for Water Quality Research (NCWQR) in July 2010. As a biologist and ecologist in the NCWQR since 1978, he has conducted research on wide-ranging topics including (1) the population and community ecology and indicator status of invertebrates in Lake Erie, its coastal marshes, and tributaries; (2) dynamics of nearshore hypoxia (oxygen depletion) in the central basin of Lake Erie and the influence of hypoxia on the structure of benthic invertebrate communities; (3) the influence of agricultural ditch maintenance and land-use practices on macroinvertebrate community structure, diversity and abundance of headwater stream systems; and (4) the role of coastal wetlands in mitigating concentrations and loads of phosphorus, nitrogen, sediment and pesticides from tributaries.
Recent funding for Dr. Krieger’s projects has come from the U.S. Army Corps of Engineers, the Ohio Lake Erie Protection Fund, the Ohio Sea Grant College Program, the National Estuarine Research Reserve Program (NOAA), USEPA, and Ontario Ministry of the Environment. His findings, often in collaboration with other scientists, have been published in journals including the Journal of Great Lakes Research, Journal of Aquatic Ecosystem Stress and Recovery, Ecological Applications, Harmful Algae, Archives of Environmental Contamination and Toxicology, Chemistry and Ecology, and Wetlands.
Dr. Krieger has served on the editorial boards of the Ohio Journal of Science, Journal of Great Lakes Research, and (currently) Wetlands Ecology and Management, and he reviews manuscripts and research proposals for numerous peer-reviewed journals and funding agencies. He is a member of the Great Lakes Aquatic Ecosystem Research Consortium and various professional societies.
Dr. Krieger teaches courses in limnology (the study of inland waters) and water pollution biology at Heidelberg University. Eleven summers from 1989 through 2002, he taught or team-taught the graduate course in limnology at Ohio State University’s F. T. Stone Laboratory on Gibraltar Island in Lake Erie. He also conducts workshops for agency staff, students, and volunteers on methods of habitat assessment and stream quality monitoring using macroinvertebrates. Dr. Krieger had the highest level (Level 3) of certification from Ohio EPA as a Qualified Data Collector for stream macroinvertebrates, is currently certified at Level 3 for stream habitat assessment (QHEI), and is approved by OEPA as a trainer for Level 3 QHEI.