Pamela Geddes smiles into the camera in front of a plain background.
Associate Chair, Professor
College of Arts and Sciences
(773) 442-5737
Courses Taught
The Changing Natural Environment (BIO 104)
Alien Invasions of Chicago (First Year Experience BIO 109A)
Essential Skills for Biologists (BIO 150)
General Biology II (BIO 202)
General Ecology (Writing Intensive Program BIO 305)
Biology Senior Seminar (Capstone BIO 390)
Independent Research in Biology (BIO 392, BIO 393)
Community Ecology (BIO 357*)
Conservation Biology (BIO 453)
Restoration Ecology (BIO 455)
Independent Investigations (BIO 481X)
Research Interests
Ecology and Environmental Science

Ph.D., Ecology, University of Chicago                                           

Post-doc., Ecology, Loyola University Chicago     

M.S., Biology, Florida International University     

B.S., Biology, Florida International University                                      

A.A., Biology, Miami-Dade Community College

Selected Publications

Volesky, L.A., S. Iqbal, J.J. Kelly, and P. Geddes. 2018. Relationships of native and exotic Phragmites australis to wetland ecosystem properties. Wetlands 38(3):577-589. DOI 10.1007/s13157-018-1001-1.

Geddes, P. 2015. Experimental evidence that subsidy quality affects the stability of recipient planktonic communities. Aquatic Sciences 77(4):609-621.

Geddes, P., T. Grancharova, J. J. Kelly, D. Treering, and N. C. Tuchman. 2014. Effects of invasive Typha x glauca on wetland ecosystem properties are influenced by time since invasion. Aquatic Ecology 48:247-258.

Lishawa, S.C., K.J. Jankowski, P. Geddes, D.J. Larkin, A.M. Monks, and N.C. Tuchman. 2014. Denitrification in a Laurentian Great Lakes coastal wetland invaded by hybrid cattail (Typha × glauca). Aquatic Sciences 76:483-495.

Larkin, D. M. Freyman, S. Lishawa, P. Geddes and N.C. Tuchman. 2011. Mechanisms of dominance by the invasive hybrid cattail Typha X glauca. Biological Invasions 14(1):65-77.

Mitchell, M.M, S. Lishawa, P. Geddes, D. Larkin, D. Treering, and N.C. Tuchman. 2011. Time-dependent impacts of cattail invasion in Great Lakes coastal wetlands. Wetlands 31:1143-1149.

Additional Information

My research interests focus on two broader themes: 1) Invasive plant species and the mechanisms that underlie successful invasions in wetlands, and 2) Ecological interactions in communities. Under theme No. 1, I’m interested in how plant invasive species’ traits (such as rapid growth, large biomass, large litter deposition, and even genotype) trigger a cascade of effects that span from their interaction with co-occurring native species all the way up to ecosystem-level processes. Within this topic, I am exploring two important wetland plant invaders: cattails (Typha spp.) and common reed (Phragmites spp.). I also combine molecular tools (microsatellite markers) to answer ecological questions, mostly related to the identification of hybridizing invasive plant species. Under theme No. 2, I’m interested in: a) how communities respond to external disturbances (e.g., invaders, pollutants, urbanization), and b) how aquatic communities are fueled, either via primary production, detritus, or external inputs (i.e., spatial subsidies).

BBH 340H
Northeastern Illinois University
5500 North St. Louis Avenue
Chicago, IL 60625
United States

(773) 442-5737
Office Hours
Please email to arrange to meet or speak with Dr. Geddes.
Main Campus