Timothy W. Stewart

515-294-1644, Fax 515-294-7874
twstewar@iastate.edu
http://www.public.iastate.edu/~twstewar/

B.A. Biology, Ithaca College, 1989
M.S. Biology, SUNY Brockport, 1993
Ph.D. Biology, Bowling Green State University, 1999

Teaching

General Ecology; Natural History of Iowa Vertebrates; Ecology of Freshwater Invertebrates, Plants, and Algae

Research

I’m an aquatic community ecologist with a research focus on using aquatic invertebrate assemblage characteristics to assess ecological condition of ecosystems.  Current projects and goals include 1) development of an ecological condition index for Iowa prairie pothole wetlands, 2) quantifying linkages between land use and in-stream features in urban and agricultural landscapes, and 3) effects of invasive species on water quality and biological communities in Clear Lake, Iowa.  All of these projects involve undergraduate and graduate students.  

Publications (Student co-authors are underlined)

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.

Herringshaw, C.J., Thompson, J.R., and Stewart, T.W. 2010. Learning about restoration of urban ecosystems: a case study integrating public participation, stormwater management, and ecological research. Urban Ecosystems 13:535-562.

Fischer, J.R., Quist, M.C., Wigen, S.L., Schaefer, A.J., Stewart, T.W., and Isenhart, T.M. 2009. Assemblage and population-level responses of stream fish to riparian buffers at multiple spatial scales. Transactions of the American Fisheries Society 139:185-200.

Stewart, T.W., and Lowe, R.L. 2008. The benthic algae of Lake Erie (1865-2006): a review of assemblage composition, ecology, and causes and consequences of changing abundance. Ohio Journal of Science 108:82-94.

Stewart, T.W., and Downing, J. 2008. Macroinvertebrate communities and environmental conditions in recently constructed wetlands. Wetlands 28:141-150.

Litvan, M.E., Pierce, C.L., Stewart, T.W., and Larson, C.J. 2008. Fish passage in a western Iowa stream modified by grade control structures. North American Journal of Fisheries Management 28:1384-1397.

Litvan, M.E., Pierce, C.L., Stewart, T.W., and Larson, C.J. 2008. Fish assemblage structure in a western Iowa stream modified by grade control structures. North American Journal of Fisheries Management 28:1398-1413.

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.

Stewart, T.W. 2007. Measuring animal movements in a natural ecosystem: a mark-recapture investigation using stream-dwelling snails. American Biology Teacher 69(1). http://www.nabt.org/websites/institution/File/pdfs/publications/abt/archived-table/2007/069-01-0028.pdf

Stewart, T.W. 2006. Observing and quantifying predator-avoidance behavior: habitat shifts in snails threatened by shell-crushing predators. Teaching Issues and Experiments in Ecology, Volume 4. Ecological Society of America. http://tiee.ecoed.net/vol/v4/experiments/habitat_shifts/abstract.html

Stewart, T.W. 2006. The freshwater gastropods of Iowa (1821-1998): taxonomic composition, geographic distributions, and conservation concerns. American Malacological Bulletin 21:59-75.