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

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

Herringshaw, C.J., Stewart, T.W., and Thompson, J.R.  Relationships among land cover, in-stream physicochemical features, and aquatic invertebrate community attributes in urban and agroecosystems.  Freshwater Biology.  In review.

Hentges, V.A., and Stewart, T.W.  Macroinvertebrate community characteristics and related environmental features in Iowa prairie pothole wetlands.  Wetlands.  In review.

Stewart, T.W., and Lowe, R.L. The benthic algae of Lake Erie (1898-2006): taxonomic composition, ecology, and causes and consequences of community change.  Ohio Journal of Science. Accepted pending revisions.

Fischer, J.R., Quist, M.C., Wigen, S.L., Schaefer, A.J., Stewart, T.W., and Isenhart, T.M.  Assemblage and population-level responses of stream fish to riparian buffers at mulitiple spatial scales.  North American Journal of Fisheries Management.  Accepted pending revisions.  

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.

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.

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/sites/S1/File/pdf/069-01-0028.pdf

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

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., and Dillon, R.T. Jr.  2004.  Composition and geographic distribution of Virginia’s freshwater gastropod fauna: a review using historical records.  American Malacological Bulletin 19:79-91.