I am a community ecologist whose research presently focuses on description of functional (cause-effect) relationships in aquatic systems and use of biotic assemblages (primarily invertebrates but also including fishes, amphibians, plants, algae) to assess aquatic ecosystem condition (i.e., health). Current projects, all of which involve students, include identification of ecological condition metrics in Iowa prairie pothole wetlands, relationships between land use and urban stream condition in central Iowa, and impacts of invasive zebra mussels and common carp on biological communities and water quality in Clear Lake, Iowa.
My broader research goal is to provide environmental agencies and scientists with information needed to effectively assess and manage the health of aquatic ecosystems in the midwest. Additionally, through outreach activities related to my research, I enjoy working with the general public to help Iowans understand how aquatic ecosystems function, and to generate greater interest in environmental stewardship among our citizens.
Key Environmental Science Publications
Herringshaw, C.J., Stewart, T.W., and Thompson, J.R. 2011. Relationships among land cover, in-stream physicochemical features, and aquatic invertebrate community attributes in urban and agroecosystems. American Midland Naturalist 165:274-293
Hentges, V.A., and Stewart, T.W. 2010. Macroinvertebrate assemblages in Iowa prairie pothole wetlands and relation to environmental features. Wetlands 30:501-511
Stewart, T.W., and Downing, J. 2008. Macroinvertebrate communities and environmental conditions in recently constructed wetlands. Wetlands 28:141-150
Litvan, M.E., Stewart, T.W., Pierce, C.L., and Larson, C.J. 2007. Local effects of grade control structures on the macroinvertebrate assemblage of an agriculturally-impacted stream. River Research and Applications 24: 218-233