Illinois Natural History Survey - University of Illinois

Greg Spyreas
Title: Research Scientist: Plant Ecology & Botany
Mailing address:
1816 S. Oak Street
Champaign, IL 61820
Office address:
Address mailcode: 652
Office room:
Location: Forbes Building (I-BLDG)
Phone: 217 300-4023

Ecological work and research that aims to bring about better conservation, restoration, management, monitoring, and understanding of natural areas and their floras/faunas-- mainly in human dominated landscapes.
Applied ecology in the Midwestern U.S., mainly related to:
---Conservation of Biodiversity;
---Non-native plant invasions;
---Restoration Ecology;
---Natural areas management;
---Urban Ecology;
---Fire Ecology;
---Human disturbance in natural areas;
---Floristic Quality Assessment;
---Oak-hickory forest regeneration;
---Vegetation monitoring
Message to students:

Please send me an email to discuss potential opportunities

Professional affiliations:
Selected publications:


SELECT GENERAL AUDIENCE                                                      
SELECT SCIENTIFIC                                      

 Glennemeier, K., S. Packard, and G. Spyreas. 2020. Dramatic long-term restoration of an oak woodland due to multiple, sustained management treatments. PLoS One. (PDF)


Zinnen, J., G. Spyreas, D. Zaya, and J. W. Matthews. 2020. Niche ecology in Floristic Quality Assessment: Are species with Higher Conservatism more specialized? Ecological Indicators. (PDF)

Price, E., G. Spyreas, and J.W. Matthews. 2020. Biotic homogenization of wetland vegetation in the conterminous United States driven by Phalaris arundinacea and anthropogenic disturbance. Landscape Ecology. (PDF)
Spyreas, G. 2019. Floristic Quality Assessment: a critique, a defense, and a primer. Ecosphere. (PDF) (ESA).
Pearse, I., H. Sofaer, D. Zaya, and G. Spyreas. 2019. Non-native plants have greater impacts because of differing per-capita effects and non-linear abundance-impact curves. Ecology Letters. (PDF(JSTOR).
Molano-Flores, B., D. Zaya, J. Baty, and G. Spyreas. 2019. An assessment of the vulnerability of Illinois’ rarest plant species to climate change. Castanea. (PDF(Castanea).
Price, E., Spyreas, G., and J.W. Matthews. 2019.Wetland compensation and its impacts on ß-diversity. Ecological Applications. (PDF(JSTOR)
Zaya*, D.N., Pearse*, I., and Spyreas*, G. 2017. Long-term trends in midwestern milkweed abundance and their relevance to monarch butterfly declines. BioScience(PDF) (Oxford Press)
Spyreas, G. 2016. Scale and Sampling effects on Floristic Quality. PLoS One(download)
Baty, J.H., Zaya, D.N., Spyreas, G., Molano-Flores, B., Benson, T.J. 2015. Conservation of the Illinois flora: A climate change vulnerability assessment of 73 plant species. Illinois Natural History Survey, Technical Report (32) (PDF)
Spyreas, G., Meiners, S., Matthews, J.W., and Molano-Flores, B. 2012. Successional trends in Floristic Quality. Journal of Applied Ecology (PDF) (Wiley)

McClain, W. E., T. L. Esker, B. R. Edgin, G. Spyreas, and J. E. Ebinger. 2010. Fire History of a post oak (Quercus stellata Wang.) woodland in Hamilton County, Illinois U.S.A. Castanea (PDF) (BioOne)

Spyreas, G. and J.W. Matthews. 2006. Floristic conservation value, nested understory floras, and the development of second-growth forest. Ecological Applications (PDF) (JSTOR)

Spyreas, G., J. Ellis, C. Carroll, B. Molano-Flores. 2004. Non-native plant commonness and dominance in the forests, wetlands, and grasslands of Illinois, USA. Natural Areas Journal (PDF) (NAA Journal)

Full publication list available here
INHS Publink:
Program affiliates:

Adjunct Assistant Professor, Department of Natural Resources and Environmental Sciences, University of Illinois Champaign-Urbana

Professional society involvement and activities:
Editorial Board, Ecological Restoration
Editorial Board, Erigenia

PHD, Natural Resources and Environmental Sciences, University of Illinois Champaign-Urbana, 2014

MS, Plant Biology, Southern Illinois University-Carbondale, 2000

BA, Environmental Studies, Denison University, 1997

Lab name: Lab research: Lab publications: Lab current projects:

Illinois Natural History Survey

1816 South Oak Street, MC 652
Champaign, IL 61820

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