OSU Logo

Jason R. Graff


Jason Graff


Assistant Professor (Senior Research)

Ph.D. 2010, University of Rhode Island


Office/Lab: Cordley 2055/2054
Phone: 541-737-4090/6204


Research Areas

Phytoplankton ecology and physiology, bacteria-phytoplankton interactions, developing and improving methods for investigating marine phytoplankton from the cellular to global scale.

Description of Research

My research interests range from cellular to global scale processes related to phytoplankton ecology.  I employ innovative methods and state of the art imaging and instrumentation to investigate the interactions of phytoplankton with their environment and other organisms (e.g. cell-cell interactions between phytoplankton and bacteria including the human pathogen Vibrio cholerae). Recent work resulted in the first direct field measurements of phytoplankton carbon.  These measurements are being applied to evaluate bio-optical relationships with phytoplankton biomass, investigate phytoplankton photophysiology, and estimate trophic interactions and carbon cycle dynamics in the surface mixed layer of the marine environment.

Related Links





Graff, J.R., T. K. Westberry, A.J. Milligan, M.B. Brown, G. Dall’Olmo, V. van Dongen- Vogels, K.M. Reifel, M.J. Behrenfeld. 2015. Analytical phytoplankton carbon measurements spanning diverse ecosystems. Deep-Sea Research Part I 102, 16- 25.

Halsey, K.H., R.T. O’Malley, J.R. Graff, A.J. Milligan, M.J. Behrenfeld. 2013. Evolutionarily distinct phytoplankton share a common partitioning strategy for photosynthetic products. New Phytologist. 198 (4), 1030-1038.

Graff, J.R., S.R. Forschner-Dancause, S. Menden-Deuer, R.A. Long, and D.C. Rowley. 2013. Vibrio cholera exploits sub-lethal concentrations of a competitor-produced antibiotic to avoid toxic interactions. Front. Microb. (8)

Graff, J.R., A.J. Milligan, M.J. Behrenfeld. 2012. The measurement of phytoplankton biomass using flow-cytometric sorting and elemental analysis of carbon. Limnol. Oceanogr. Meth. (10). 910-920.

Graff, J.R., J.E.B. Rines, and P. Donaghay. 2011. Enumeration of marine bacteria attached to phytoplankton and factors regulating attachment. Mar. Ecol. Prog. Ser. (441). 15-24.

Graff, J.R. and T.A. Rynearson. 2011. Extraction method influences the recovery of phytoplankton pigments from natural assemblages. Limnol. Oceanogr. Meth. (9). 129-139.

Graff, J.R. and J.A. Blake. 2008. Polychaetes from hydrothermal vents. J. Mar. Bio. Assoc. UK newsletter.

Graff, J.R. 2008. Book review of Algal Chemical Ecology. C.D. Amsler (Ed.). Springer- Verlag Berlin Heidelberg. In CLEAN – Soil, Air, Water. 36(3). 252.

Graff, J.R., J.A. Blake, and K.F. Wishner. 2008. A new species of Malacoceros (Polychaeta: Spionidae) from the hydrothermally active crater of Kick’em Jenny, a submarine volcano in the Lesser Antilles Arc (Caribbean Sea). J. Mar. Bio. Assoc. UK. 88(5). 925-930.

Sullivan, B.K., Gifford, D.J., Costello, J.H., Graff, J.R. 2008. Narragansett Bay Ctenophore-Zooplankton-Phytoplankton Dynamics in a Changing Climate. In: Science for Ecosystem-based Management: Narragansett Bay in the 21st Century. A. Desbonnet, B. Costa-Pierce (Eds.) Springer Environ. Series.

Wishner, K.F., J.R. Graff, J.W. Martin, S. Carey, H. Sigurdsson, and B.A. Seibel. 2005. Are midwater shrimp trapped in the craters of submarine volcanoes by hydrothermal venting? Deep-Sea Res. I. 52. 1528-1535.

Martin, J.W., K.F. Wishner, and J.R. Graff. 2005. Caridean and Sergestid shrimp from the Kick’em Jenny Submarine Volcano, Southeastern Caribbean Sea. Crustaceana. 78. 215-221.