image for Dewalt, R Edward

Dewalt, R Edward

Aquatic Entomologist
Species File Program Coordinator

Address and Contact Information

1909 S Oak St.
Rms. 2025, 2000
M/C 652
Champaign, IL  61820

Current Projects

Plecoptera Species File. Home of the world list of stonefly names, literature, distributions, images, and sounds.

Research Biography

My laboratory studies changes in the distribution of aquatic insects using our extensive research collections at the Illinois Natural History Survey and new collections from throughout North America. Current projects are to determine the pre-settlement range of stoneflies (Plecoptera) throughout the Midwest using museum specimens from throughout the region, a wealth of GIS data and distribution modeling. These historical expectations help my colleagues and I to interpret current distributions. Additional work includes modification of some the model climate data to predict changes in species distributions related to climate change.

An unrelated project seeks to reconstruct past dispersal patterns of stoneflies after the most recent glaciation. ice-covered areas were devoid of most species that occur there today. What routes did they take to get there after the glaciers receded, are there species specific characteristics that influence migration patterns. This information is also useful in identifying populations that are most diverse genetically and allows researchers to pick populations for reintroduction that most closely match the genetic structure of historic populations lost from a region.

Honors and Awards

Standing Committee of the International Society of Plecopterologists
Past President and Current Treasurer Illinois State Academy of Science

Professional Affiliations

Society for Freshwater Science
International Society of Plecopterologists
Entomological Society of American
Illinois State Academy of Science

Selected Publications

Pessino, M., E. T. Chabot, R. Giordano and R. E. DeWalt. 2014. Refugia and postglacial expansion of Acroneuria frisoni Stark & Brown (Plecoptera‚ą∂ Perlidae) in North America. Freshwater Science. on-line edition.

Grubbs, S. A., B. C. Kondratieff, and R. E. DeWalt. 2013. A review of the Nearctic genus Zealeuctra Ricker (Plecoptera, Leuctridae), with the description of a new species from the Cumberland Plateau region of eastern North America. Zookeys 344: 17-47.

Cao, Y., R. E. DeWalt, J. L. Robinson, T. Tweddale, L. Hinz, and M. Pessino. 2013. Using Maxent to model the historic distributions of stonefly species in Illinois streams and rivers: the effects of regularization and threshold selections. Ecological Modelling, 259: 30–39.

Webb, J. M. Jacobus, L. M. D. H. Funk, X. Zhou, B. Kondratieff, C. J. Geraci, R. E. DeWalt, D. J. Baird, B. Richard, I. Phillips, P. D. N. Hebert. 2012. A DNA Barcode Library for North American Ephemeroptera: Progress and Prospects. PLoS ONE 7(5): e38063. doi:10.1371/journal.pone.0038063/

DeWalt, R. E., Y. Cao, T. Tweddale, S. A. Grubbs, L. Hinz, M. Pessino, J. L. Robinson. 2012. Ohio USA stoneflies (Insecta, Plecoptera): species richness estimation, distribution of functional niche traits, drainage affiliations, and relationships to other states. ZooKeys 178: 1–26. doi: 10.3897/zookeys.178.2616.

DeWalt, R. E., M. D. Maehr, U. Neu-Becker and G. Stueber. 2013. Plecoptera Species File. Version 5.0/5.0.

Selected Service Activities

Taxonomy Fair Participant and Plecoptera Expert for Taxonomic Certification Program for Society for Freshwater Science.


PhD, Aquatic Entomology, University of North Texas, 1992
MS, Biology, University of Akron, Ohio, 1986
BA, Biology, Hiram College, Ohio, 1983

LDAP Details for Dewalt, R Edward