» Dr. Jason Keller
Associate Professor, 2013-2015 Wang-Fradkin Assistant Professor

Schmid College of Science and Technology; Biological Sciences
Dr. Jason Keller
Office Location:
Hashinger Science Center 328
(714) 289-2072
University of Notre Dame, Bachelor of Science
University of Notre Dame, Ph.D.
Video Profile

Dr. Jason Keller is an ecologist broadly interested in the flow of carbon and nutrients through ecosystems.  Much of his work explores how ecosystems will respond to ongoing global change.  His current research focuses on the controls of anaerobic decomposition and greenhouse gas dynamics in a variety of wetlands, ranging from northern peatlands to tidal marshes.

Courses Taught:

  • Introduction to Environmental Science (ENV 101) 
  • Ecosystem Ecology (BIOL 319, with laboratory)
  • Stable Isotopes Ecology (BIOL 496)


  • Chapman University Faculty Excellence Award for Teaching (2012)
  • Chapman University Office of Sponsored Research Young Investigator Award (2012)
  • Chapman University Curriculum Innovation in Sustainability Faculty Teaching Award (2011)
  • Chapman University Valerie Scudder Award for Outstanding Achievement in Teaching, Scholarly/Creative Activity and Service to the University (2011)
  • Chapman University Faculty Excellence Award for Research (2010)
  • Smithsonian Institution Post-doctoral Fellowship (2006-2008)
  • University of Notre Dame, Department of Biological Sciences Award for Outstanding Graduate Research (2006)
  • Arthur J. Schmitt Graduate Fellowship (2000-2005)
  • National Science Foundation Graduate Research Fellowship (2001-2004)

Professional Activities:

  • Member of California Academy of Sciences, Ecological Society of America, Sigma Xi, and Society of Wetland Scientists
  • Reviewer for the National Science Foundation and the Environmental Protection Agency
  • Reviewer for a number of scientific journals, including:, Biogeochemistry, Biogeosciences Discussions, Geochimica et Cosmochimica Acta, Ecosystems, Environmental Science & Technology, Global Change Biology, Journal of Geophysical Research-Biogeosciences, Nature, New Phytologist, Proceedings of the National Academy of Sciences of the United States, Soil Biology & Biochemistry, Wetlands
  • Society of Wetland Scientists: Student grant reviewer (2008-present)
  • Society of Wetland Scientists: Treasurer of Western Chapter (2010-present)
  • Panelist for NSF and EPA Graduate Fellowship Programs (2011-2012)
  • Society of Wetland Scientists: Chair of Wetland Biogeochemistry Section (2011)
  • Application review committee for the Dissertation Initiative for the Advancement of Climate Change Research Symposium (DISCCRS IV, 2008; DISCCRS V, 2009; DISCCRS VII, 2012)
  • Member of National Center for Ecological Analysis and Synthesis (NCEAS) working group on tidal wetland carbon sequestration and greenhouse gas emissions (2010)
  • Participant in the Dissertation Initiative for the Advancement of Climate Change Research Symposium (DISCCRS III) (2007)
Recent Creative, Scholarly Work and Publications
Bowen, J.C., C.D. Clark, J.K. Keller, and W.J. DeBruyn. 2017. Optical properties of chromophoric dissolved organic matter (CDOM) in surface and pore waters adjacent to an oil well in a Southern California salt marsh. Marine Pollution Bulletin 114:157-168.
Keller, J.K., Medvedeff, C.A. 2016. Soil organic matter, In: Vepraskas, M.J., Craft, C.B., Richardson, J.L. (Eds.), Wetland Soils: Genesis, Hydrology, Landscapes, and Classification, Second Edition. CRC Press, Boca Raton, FL. Pages 165-188.
Ye, R., J.K. Keller, Q. Jin, B.J.M. Bohannan and S.D. Bridgham. 2016. Peatland types influence the inhibitory effect of a humic substance analog on methane production. Geoderma 265:131-140
Wang, S., Q. Zhuang, Z. Yu, S. Bridgham, J.K. Keller, and P. Hanson. 2016. Quantifying peat accumulation in Alaska using a process-based biogeochemistry model. Journal of Geophysical Research – Biogeosciences 121: 2172-2185.
Wilson, R.M., A.M. Hopple, M.M. Tfaily, S.D. Sebestyen, C.W. Schadt, L. Pfeifer-Meister, C. Medvedeff, K.J. McFarlane, J.E. Kostka, M. Kolton, R. Kolka, L.A. Kluber, J.K. Keller, T.P. Guilderson, N.A. Griffiths, J.P. Chanton, S.D. Bridgham and P.J. Hanson. 2016. Stability of a peatland carbon bank to rising temperatures. Nature Communications 7:13723.
Medvedeff, C.A., S.D. Bridgham, L. Pfeifer-Meister and J.K. Keller. 2015. Can Spahgnum leachate chemistry explain differences in anaerobic decomposition in peatlands? Soil Biology & Biochemistry 86:34-41.
Keller, J.K., T. Anthony, D. Clark, K. Gabriel, D. Gamalath, R. Kabala, J. King, L. Medina and M. Nguyen. 2015. Soil organic carbon and nitrogen storage in two southern California salt marshes: the role of pre-restoration vegetation. Bulletin of the Southern California Academy of Sciences 114(1).
Ye, R., Q. Jin, B. Bohannan, J.K. Keller, and S.D. Bridgham. 2014. Homoacetogenesis: A potentially underappreciated carbon pathway in peatlands. Soil Biology & Biochemistry 68:385-391.
Clark, C.D., P. Aiona, J.K. Keller and W.J. DeBruyn. 2014. Optical characterization and distribution of chromophoric dissolved organic matter (CDOM) in soil porewater from a salt marsh ecosystem. Marine Ecology Progress Series 516:71-83.
Bridgham, S.D., H. Cadillo-Quiroz, J.K. Keller and Q. Zhuang. 2013. Methane emissions from wetlands: biogeochemical, microbial, and modeling perspectives from local to global scales. Global Change Biology 19:1325-1346
Keller, J.K. and K.K. Takagi. 2013. Solid-phase organic matter reduction regulates anaerobic decomposition in bog soil. Ecosphere 4(5):54.
Weiler, C.S., J.K. Keller and C. Olex. 2012. Personality type differences between Ph.D. climate researchers and the general public: implications for effective communication. Climatic Change 112:233-242.
Iversen, C.M., J.K. Keller, C.T. Garten, and R.J. Norby. 2012. Deep root inputs under elevated [CO2] may increase soil C and N storage. Global Change Biology. 18:1684-1697.
Ye, R., Q. Jin, B. Bohannan, J.K. Keller, S.A. McAllister and S.D. Bridgham. 2012. pH controls over anaerobic carbon mineralization, the efficiency of methane production and methanogenic pathways in peatlands across an ombrotrophic-minerotrophic gradient. Soil Biology & Biochemistry 54:36-47.
Keller, J.K., K.K. Takagi, M.E. Brown, K.N. Stump, C.G. Takahashi, W. Joo, K.L. Au, C.C. Calhoun, R.K. Chundu, K. Hokutan, J.M. Mosolf and K. Roy. 2012. Soil organic carbon storage in restored salt marshes in Huntington Beach, California. Bulletin of the Southern California Academy of Sciences 111(2):153-161.
Emerson, D., W. Bellows, J.K. Keller, A.E. Sutton-Grier, and J.P. Megonigal. 2013. Anaerobic metabolism in tidal freshwater wetlands: II. Effects of plant removal on Archaeal microbial communities. Estuaries and Coasts 36:471-481.
Keller, J.K., A.E. Sutton-Grier, A. Bullock, and J.P. Megonigal. 2013. Anaerobic metabolism in tidal freshwater wetlands: I. Plant removal effects on iron reduction and methanogenesis. Estuaries and Coasts 36:457-470.
Sutton-Grier, A.E., J.K. Keller, R. Koch, C. Gilmour, and J.P. Megonigal. 2011. Electron donors and acceptors influence anaerobic soil organic matter mineralization in tidal marshes. Soil Biology and Biochemistry 43: 1576-1583.
Rabenhorst, M.C., J.P. Megonigal, and J.K. Keller. 2010. Synthetic iron oxides for documenting sulfide in marsh pore water. Soil Science Society of America Journal 74:1383-1388.
Keller, J.K., P.B. Weisenhorn*, and J.P. Megonigal. 2009. Humic acids as electron acceptors in wetland decomposition. Soil Biology & Biochemistry 41:1518-1522. (* = student collaborator)
Keller, J.K., A.A. Wolf*, P.B. Weisenhorn*, B.G. Drake, and J.P. Megonigal. 2009. Elevated CO2 affects porewater chemistry in a brackish marsh. Biogeochemistry 96:101-117. (* = student collaborator)
Ma, S., G.W. Luther III, J. Keller, A.S. Madison E. Metzger, J.P. Megonigal, and D. Emerson. 2008. Solid-state Au/Hg microelectrode for the investigation of Fe and Mn cycling in a freshwater wetland: implications for methane production. Electroanalysis 20(3):233-239.
Chen, J., S.D. Bridgham, J. Keller, J. Pastor, A. Noormets, and J.F. Weltzin. 2008. Temperature Responses to Infrared-Loading and Water Table Manipulations in Peatland Mesocosms. Journal of Integrative Plant Biology 50(11):1484-1496.
Bridgham, S.D., J.P. Megonigal, J.K. Keller, N.B. Bliss, and C. Trettin. 2007. Wetlands. In: The First State of the Carbon Cycle Report (SOCCR): The North American Carbon Budget and Implications for the Global Carbon Cycle. A Report by the U.S. Climate Change Science Program and the Subcommittee on Global Change Research [King, A.W., L. Dilling, G.P. Zimmerman, D.M. Fairman, R.A. Houghton, G. Marland, A.Z. Rose, and T.J. Wilbanks (eds.)]. National Oceanic and Atmospheric Administration, National Climatic Data Center, Asheville, NC, USA, pp. 139-148.
Keller, J.K. and S.D. Bridgham. 2007. Pathways of anaerobic carbon cycling across an ombrotrophic-minerotrophic peatland gradient. Limnology and Oceanography 52:96-107.
Weltzin, J.F., R.T. Belote, L.M. Williams, J.K. Keller, and E.C. Engel. 2006. Authorship in ecology: attribution, accountability, and responsibility. Frontiers in Ecology and the Environment 4:435-441.
Bridgham, S.D., J.P. Megonigal, J.K. Keller, N.B. Bliss, and C. Trettin. 2006. The carbon balance of North American wetlands. Wetlands 26(4):889-916.
Keller, J.K., A.K. Bauers*, S.D. Bridgham, L.E. Kellogg, and C.M. Iversen. 2006. Nutrient control of microbial carbon cycling along an ombrotrophic-minerotrophic peatland gradient. Journal of Geophysical Research 111, G03006, doi:10.1029/2005JG000152. (* = student collaborator)
Weltzin, J.F.*, J.K. Keller*, S.D. Bridgham, J. Pastor, P.B. Allen, and J. Chen. 2005. Litter controls plant community composition in a northern fen. Oikos 110:537-546. (* = authors contributed equally)
Keller, J.K., S.D. Bridgham, C.T. Chapin, and C.M. Iversen. 2005. Limited effects of long-term fertilization on carbon mineralization in a Minnesota fen. Soil Biology & Biochemistry 37:1197-1204.
Keller, J.K., J.R. White, S.D. Bridgham, and J. Pastor. 2004. Climate change effects on carbon and nitrogen mineralization in peatlands through changes in soil quality. Global Change Biology 10:1053-1064.