Tamara Kraus


Tamara Kraus received a master's degree in Agronomy and a doctoral degree in Soils and Biogeochemistry from the University of California, Davis. She has been working at the USGS California Water Science Center (CAWSC) in Sacramento since 2004, where she does research on the cycling of carbon and nutrients, and the linkages between terrestrial and aquatic systems.  Her projects span a range of topics from identifying sources of dissolved organic carbon and to inform drinking water quality management, to using constructed wetlands to reverse subsidence, to the application of in situ coagulation to remove mercury from surface waters, to understanding the links between nutrients and phytoplankton.



Ph.D., Soils and Biogeochemistry, 2002, University of California, Davis , CA Dissertation: Tannins and Nutrient Dynamics in Forest Soils: Plant-Litter-Soil Interactions

M.S., Agronomy and Range Science, 1994, University of California, Davis, CAThesis: Weed Abundance and Competition in Water-Seeded versus Drill-Seeded Rice in California

B.A., Biology and Society: Agriculture and the Environment, 1989, College of Arts and Sciences Cornell University, Ithaca, NY



2010-present   Soil Scientist, US Geological Survey, Sacramento, CA

2006-2009        Post Doctoral Researcher, US Geological Survey through UC Davis, Sacramento, CA

2004-2005        National Research Council Post Doctoral Fellow with US Geological Survey, Sacramento, CA

1996-2003        Research Assistant: Soil Chemistry Lab, , University of California, Davis, CA    

1996-2003        Teaching Assistant: Soils and Biogeochemistry, , University of California, Davis, CA   

1995-1996        Post-Graduate Researcher/Project Manager, University of California, Davis, CA          

1992-1994        Research Assistant: Agronomy, University of California, Davis, CA    







Ackerman, J.T. T.E.C. Kraus, J.A. Fleck, D.P. Krabbenhoft, W.R. Horwath, S.M. Bachand, M.P. Herzog, C.A. Hartman, P.A.M. Bachand. 2015. Experimental Dosing of Wetlands with Coagulants Removes Mercury from Surface Water and Decreases Mercury Bioaccumulation in Fish. Environmental Science & Technology. 49: 6304−6311 [Link]

Stumpner, E.B., T.E.C. Kraus, J.A.,Fleck, A.M. Hansen, S.M. Bachand, W.R. Horwath, J.F. DeWild, D.P. Krabbenhoft, P.A.M. Bachand, 2015, Mercury, monomethyl mercury, and dissolved organic carbon concentrations in surface water entering and exiting constructed wetlands treated with metal-based coagulants, Twitchell Island, California: U.S. Geological Survey Data Series 950, 26 p. [Download File]

Henneberry, Y.K., Kraus, T. E.C., Krabbenhoft, D. P., & Horwath, W.R., 2015. Investigating the temporal effects of metal-based coagulants to remove mercury from solution in the presence of dissolved organic matter, Environmental Management. DOI 10.1007/s00267-015-0601-2 [Download File]

Carpenter, K.D., T.EC. Kraus, J.H. Goldman, J.F. Saraceno, B.D. Downing, B.A. Bergamaschi, G. McGhee, T. Triplett. 2013 Sources and Characteristics of Organic Carbon in the Clackamas River, Oregon, Related to the Formation of Disinfection By-Products in Treated Drinking Water. U.S. Geological Survey Scientific Investigations Report 2013-2001, XX p. [Link]

Fleck, J.A., G. Gill, B.D. Downing, B.A. Bergamaschi, T.E.C. Kraus, B.D. Downing and C.N. Alpers. 2013. Concurrent photolytic degradation of aqueous methylmercury and dissolved organic matter.Science of the Total Environment. [Link]

Henneberry YK, TEC Kraus, PS Nico, WR Horwath. 2012. Structural stability of coprecipitated natural organic matter and ferric iron under reducing conditions. Organic Geochemistry [Download File]

Downing B.D., B.A. Pellerin, B.A. Bergamaschi, JF Saraceno and T.E.C. Kraus. 2012. Seeing the light: The effects of particles, temperature and inner filtering on in situ CDOM fluorescence in rivers and streams. Limnology and Oceanography: Methods, 10: 767-775. [Download File]

Kraus T.E.C., B.A. Bergamaschi, P.J. Hernes, D. Doctor, C. Kendall, B.D. Downing, R.F. Losee. 2011. How reservoirs alter drinking water quality: Organic matter sources, sinks, and transformations. Lake and Reservoir Management 27:205–219. [Link]

Koterba M.T., M.C. Waldron, T.E.C Kraus. 2011. The Water-Quality Monitoring Program for the Baltimore Reservoir System, 1981–2007—Description, Review and Evaluation, and Framework Integration for Enhanced Monitoring. U.S. Geological Survey Scientific Investigations Report 2011–5101, Reston, VA. p. 133. [Link]

Henneberry, Y.K., T.E.C. Kraus, J. A. Fleck, D.P. Krabbenhoft, P.M. Bachand, W.R. Horwath. 2011. Removal of inorganic mercury and methylmercury from surface waters following coagulation of dissolved organic matter with metal-based salts. Science of the Total Environment. 409:631-637. [Download File]

Kraus, T.E.C, C. Anderson, K. Morgenstern, B. Downing, B.A. Pellerin, B.A. Bergamaschi, 2010. Sources of dissolved organic carbon and disinfection by-products to the McKenzie River, Oregon. Journal of Environmental Quality 39:2100-2112. [Link]

Pellerin, B.A., B.D. Downing, C. Kendall, R.A. Dahlgren, R.G.M. Spencer, T.E.C. Kraus, B.A. Bergamaschi. 2008. Assessing the sources and magnitude of diurnal nitrate variability in the San Joaquin River (California) with an in-situ optical nitrate sensor and dual nitrate isotopes. Freshwater Biology doi:10.1111/j.1365-2427.2008.02111.x. [Link]

Kraus, T.E.C, B.A. Bergamaschi, P.J. Hernes, R.G.M. Spencer, R. Stepanauskas, C. Kendall, R.F. Losee, R. Fujii. 2008. Assessing the contribution of wetlands and subsided islands to dissolved organic matter and disinfection byproduct precursors in the Sacramento-San Joaquin River Delta: A geochemical approach. Organic Geochemsitry: 39:1302–1318 [Link]

Spencer R.G., B.A. Pellerin, B.A. Bergamaschi, B.D. Downing, T.E.C Kraus, D.R. Smart, R.A. Dahlgren, P.J. Hernes. 2007. Diurnal variability in riverine dissolved organic matter composition determined by in-situ optical measurement. Hydrological Processes 21: 3181-3189. [Link]

Kraus, T.E.C., R.J. Zasoski, R.A. Dahlgren, W.R.Horwath, C.M. Preston. 2004. Carbon and nitrogen dynamics in a forest soil amended with purified tannins from different plant species. Soil Biology and Biochemistry 36:309-321. [Link]

Kraus, T.E.C., R.J. Zasoski, R.A. Dahlgren. 2004. Fertility and pH effects on polyphenol and condensed tannin concentrations in foliage and roots. Plant and Soil 262:95-109. [Link]

Kraus, T.E.C., R.A. Dahlgren, R.J. Zasoski. 2003. Tannins in nutrient dynamics of forest ecosystems—a review. Plant and Soil 256:41-66. [Link]

Kraus, T.E.C., Z. Yu, C.M. Preston, R.A. Dahlgren, R.J. Zasoski. 2003. Linking chemical reactivity and protein precipitation to structural characteristics of foliar tannins. Journal of Chemical Ecology 29:703-730. [Link]

Yu, Z., T.E.C. Kraus, R.A. Dahlgren, W.R. Horwath, R.J. Zasoski. 2003. Nitrogen dynamics across a soil fertility-acidity gradient. Soil Science Society of America 67:878-888.

Yu, Z., Q. Zhang, T.E.C. Kraus, R.A. Dahlgren, C. Anastasio, R.J. Zasoski. 2002. Contribution of amino compounds to dissolved organic nitrogen in forest soils. Biogeochemistry 61:173-198. [Link]