image for Tweddale, Tari Ann

Tweddale, Tari Ann

Associate Research Scientist, GIS

Address and Contact Information

Forbes Natural History Building
1816 S. Oak St.
M/C 652
Champaign, IL  61820


MS, Natural Resources in Environmental Sciences, University of Illinois, Urbana-Champaign, 2006

BS, Ecology, Ethology, and Evolution, University of Illinois, Urbana-Champaign, 1998

Research Biography

Professional Affiliations

Member of the Illinois GIS Association

Current Projects

Develop and maintain numerous spatial databases during my 20+ years at INHS.  Currently the lead GIS person for the IDOT wetlands program and PI of the IDNR Owned, Managed, and Leased Properties (OMLP) project.   I currently manage a parcel fabric database of properties under ownership or management in some form for all IDNR properties, as well as numberous GIS datasets in ArcGIS Enterprise for PRI.   

Professional Certifications

Certified Geographic Information Systems Professional (GISP), renewed June 2021

Selected Publications

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: The effects of regularization and threshold selections. Ecological Modelling 259: 30-9.
Tweddale, T., G. Krumins, and K. Cummings.  2012. Multi-state Spatial Database to Access Threats to Mussels. INHS Technical Report 2012 (40), 35pp, Prepared for the USFWS, Division of Endangered Species, Region 3, 5600 American Blvd West, Suite 900, Bloomington, MN 55437-1458.  Report issued on 12/28/2012
DeWalt, R. E., Y. Cao, T. Tweddale, S.A. Grubbs, L. Hinz, M. Pessino, and 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.
Luman, Don, T. Tweddale. Assessment and Potential of the 2007 USDA-NASS Cropland Data Layer for Statewide Annual Land Cover Applications. INHS Technical Report 2008 (49). 61pp.

Tweddale, T. The USDA-NASS Cropland Data Layer for Statewide Annual Land Use/Land Cover Applications, Illinois Natural History Survey Reports, Autumn 2008, No. 397.

DeWalt, R. Edward, Y. Cao, T. Tweddale. 2008. Reconstruction of Historical Distributions of Stoneflies (Plecoptera) Using Museum Records. CF: 56th Annual Meeting of the North American Benthological Society (NABS 2008), Salt Lake City, Utah (USA), 25-30 May 2008.

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