Dr. Stewart is a biogeochemist with interest in the interactions between organisms and elemental cycling, particularly in the ocean. Currently she uses natural radionuclides to investigate the trophic transfer and bioaccumulation of metals by plankton, as well as to trace organic carbon cycling in the surface ocean. Her work sheds light on the mechanisms of contaminant accumulation in ecosystems as well as the ocean’s potential to sequester atmospheric carbon dioxide, a greenhouse gas. Further, her research into the behavior of present-day radioactive tracers may provide insight into the use of naturally-occurring paleotracers in the ocean. Thus far, she has focused her research on the unique, short-lived, particle-reactive isotope polonium-210. At Queens College she continues to pursue regional environmental contaminant studies as well as her work on large-scale oceanographic questions.
- Choi H.-Y., Lomas M., Moran S.B., Kelly R., Stewart G. (2014) Linking the distribution of 210Po and 210Pb with plankton community along Line P, Northeast Subarctic Pacific. Journal of Environmental Radioactivity 138: 390-401
- Rice E.J., Dam H., Stewart G. (2013) Impact of climate change on estuarine zooplankton: Surface water warming in Long Island Sound is associated with changes in copepod size and community structure. In Estuaries and Coasts 38(1): 13-23
- T. Church, Rigaud S., Baskaran M., Kumar A., Friedrich, J., Masque, P., Puigcorbe V., Kim, G., Radakovitch, O., Hong G., Choi, H-Y., Stewart G. (2012) Intercalibration studies of 210Po and particulate seawater sample. Limnology and Oceanography Methods 10: 776-789
- Seebaugh, D.R., W.G. Wallace, W.J. L’Amoreaux, G.M. Stewart (2011) Carbon Assimilation and Digestive Toxicity in Naıve Grass Shrimp (Palaemonetes pugio) Exposed to Dietary Cadmium. Bulletin of Environmental Contaminant Toxicology 88: 449-455
- Stewart, G., Moran, S.B., Lomas M., and Kelly, R.P. (2010) Direct comparison of 210Po, 234Th and POC particle-size distributions and export fluxes at the Bermuda Atlantic Time-series Study (BATS) site. Journal of Environmental Radioactivity 102 (5): 479-489.
- Board of Directors, Association of Scientists in Limnology and Oceanography
- New York Marine Science Research Consortium
- Long Island Sound Study Science and Technical Advisory Committee