Robert F. Stallard

Robert F. Stallard

Professor Adjoint

  • Research Hydrologist, U.S. Geological Survey
  • Research Scientist, Smithsonian Tropical Research Institute, Panama



  • PhD: Massachusetts Institute of Technology - Woods Hole Oceanographic Institute, 1980

Contact Information

(Office) 303 735-7811


Biogeochemistry, hydrology, and geomorphology.


The earth-surface environment and how it changes on human and geologic time scales. My emphasis is on climate and land-use changes and how these affect processes that control the composition and dispersal of dissolved and solid phases in rivers and trace gases in the atmosphere. My work combines both field and theoretical studies using the tools of geology, biology, biogeochemistry, and geography.

Current areas of investigation: (1) Can we develop general physically and biologically based models of the processes that generate the dissolved and particulate load in rivers and trace substances in the atmosphere? (2) How do various phases chemically partition during transport in rivers and estuaries? (3) What are the dispersal pathways of river-borne substances through rivers and estuaries into the coastal environment? (4) How do human activities, particularly land-use change, affect environments being examined? (5) How do we use rivers to integrate phenomena at local spatial scales up to continental scales? (6) Can we formulate provenance models to reconstruct past geologic environments?


  • Meritorious Service Award for "exceptional contributions to the development of new and innovative research programs in the U.S. Geological Survey.", Department of the Interior, 2002




Pitman, N. C. A., Vriesendorp, C. F., Reyes, D. A., Moskovits, D. K., Kotlinski, N., Smith, R. C., Thompson, M. E., Wali, A., Matarazzo, M. B., del Campo, Á., Rivera González, D. E., Rivera Chávez, L., Rosenthal, A. D., Álvarez Alonso, J., Díaz Ñaupari, M. E., de Souza, L. S., Ferreyra Vela, F. R., Gonzales Tanchiva, C. N., Jarrett, C. C., Lemos, A. A., Sáenz Rodríguez, A. R., Stotz, D. F., Suwa, T., Pariona Fonseca, M., Ravikumar, A., Torres Tuesta, T., Bravo, A., Catenazzi, A., Díaz Alván, J., Gagliardi-Urrutia, G., García-Villacorta, R., Hidalgo, M. H., Mori Vargas, T. M., Mueses-Cisneros, J. J., Núñez-Iturri, G., Pequeño, T., Ríos Paredes, M. A., Rodríguez, L. O., Robert F. Stallard, Torres Montenegro, L. A., Venegas, P. J., von May, R., Barbagelata Ramírez, N., Maldonado Ocampo, J. A., Mesones Acuy, I. 2021: Applied science facilitates the large-scale expansion of protected areas in an Amazonian hot spot. Science Advances, 7(31). DOI: 10.1126/sciadv.abe2998

Sheila MurphyRobert F. Stallard, Scholl, M. A., González, G., Torres-Sánchez, A. J. 2017: Geospatial data for Luquillo Mountains, Puerto Rico: Mean annual precipitation, elevation, watershed outlines, and rain gage locations. U.S. Geological Survey data release. DOI: 10.5066/F74F1PM2

Sheila MurphyRobert F. Stallard 2012: Water quality and landscape processes of four watersheds in eastern Puerto Rico. U.S. Geological Survey Professional Paper 1789, 292 p.

Ackerman, K. V., Mixon, D. M., Sundquist, E. T., Robert F. Stallard, Schwarz, G. E., Stewart, D. W. 2009: RESIS-II: An updated version of the original Reservoir Sedimentation Survey Information System (RESIS) database. USGS Data Series 434.

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