Louis Kaplan, Ph.D.

500 500 Stroud Water Research Center

Research Scientist Emeritus

  • Affiliate Faculty, Delaware Environmental Institute, University of Delaware

970 Spencer Road, Avondale, PA 19311

Interests and Expertise

Dissolved organic matter biogeochemistry, aquatic microbial ecology, and nutrient cycling.

Google Scholar


  • Ph.D., Biology (Limnology), University of Pennsylvania, Philadelphia, Pennsylvania.
  • M.S., Ecology, University of California, Davis, California.
  • B.A., Environmental Sciences, Franklin and Marshall College, Lancaster, Pennsylvania.

Professional Experience

  • Research Scientist Emeritus, Stroud Water Research Center, 2018–present.
  • Director, Ecosystem Science Cluster, Division of Environmental Science, National Science Foundation, 2015–2018.
  • Senior Research Scientist, Stroud Water Research Center, 1999–2017.
  • Curator, Division of Environmental Research, Stroud Water Research Center, Academy of Natural Sciences of Philadelphia, 1996–1999.
  • Assistant Curator, Division of Environmental Research, Stroud Water Research Center, Academy of Natural Sciences of Philadelphia, 1988–1992.
  • Research Associate, Division of Environmental Research, Stroud Water Research Center, Academy of Natural Sciences of Philadelphia, 1980–1988.
  • Post Graduate Research Scientist III, University of California, Davis, California, 1974–1975.


Biophysical controls on organic carbon fluxes in fluvial networks

Battin, T.J., L.A. Kaplan, S. Findlay, C.S. Hopkinson, E. Marti, A.I. Packman, J.D. Newbold, and F. Sabater. 2008. Nature Geoscience 1:95–100.

Protecting headwaters: the scientific basis for safeguarding stream and river ecosystems

Kaplan, L.A., T.L. Bott, J.K. Jackson, J.D. Newbold, and B.W. Sweeney. 2008. Research synthesis from Stroud Water Research Center, Avondale, Pennsylvania.

Science and policy: new insights into terrestrial, aquatic, and atmospheric carbon flow and implications for stormwater management policy

Adams, S., L.A. Kaplan, and E. Ritchie. 2008. Proceedings of the Water Environment Federation WEFTEC 2008:2828-2829.

Macroinvertebrate distribution in relation to land use and water chemistry in New York City drinking-water-supply watersheds

Kratzer, E.B.J.K. Jackson, D.B. Arscott, A.K. Aufdenkampe, C.L. Dow, L.A. Kaplan, J.D. Newbold, and B.W. Sweeney. 2006. Journal of the North American Benthological Society 25:954–976.

Organic matter transport in New York City drinking-water-supply watersheds

Kaplan, L.A., J.D. Newbold, D.J. Van Horn, C.L. Dow, A.K. Aufdenkampe, and J.K. Jackson. 2006. Journal of the North American Benthological Society 25:912–927.

See all publications by Stroud Center authors

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This project addresses long-term changes in a stream ecosystem in southeastern Pennsylvania to evaluate best management practices for riparian or streamside lands and provide a time frame for ecosystem recovery