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.


Uptake of nutrients and organic C in streams in New York City drinking-water-supply watersheds

Newbold, J.D., T.L. Bott, L.A. Kaplan, C.L. Dow, J.K. Jackson, A.K. Aufdenkampe, L.A. Martin, D.J. Van Horn, and A.A. Long. 2006. Journal of the North American Benthological Society 25(4):998–1017.

Ecosystem metabolism in streams of the Catskill Mountains (Delaware and Hudson River watersheds) and Lower Hudson Valley

Bott, T.L., D.S. Montgomery, J.D. Newbold, D.B. Arscott, C.L. Dow, A.K. Aufdenkampe, J.K. Jackson, and L.A. Kaplan. 2006. Journal of the North American Benthological Society 25(4):1018–1044.

Enhanced source-water monitoring for New York City: summary and perspective

Sweeney, B.W., D.B. Arscott, C.L. Dow, J.G. Blaine, A.K. Aufdenkampe, T.L. Bott, J.K. Jackson, L.A. Kaplan, and J.D. Newbold. 2006. Journal of the North American Benthological Society 25(4):1062–1067.

Biodegradable dissolved organic matter in a temperate and a tropical stream determined from ultra-high resolution mass spectrometry

Kim, S., L.A. Kaplan, and P.G. Hatcher. 2006. Limnology and Oceanography 51:1054–1063.

Measuring watershed health: training conservation planners how to use biophysical tools for monitoring streams in neo-tropical ecosystems

Sweeney, B.W., et al. 2006. Moore Foundation Peru Project Final Report. Stroud Water Research Center, Avondale, Pennsylvania.

See all publications by Stroud Center authors

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Water Quality and Stream Health in Eastern Pennsylvania: 40 Years of Progress

This project compares the current state of 11 Bucks County, Pennsylvania streams with data collected from 1968-1971, before the Clean Water Act went into effect. Research comparisons will document whether

UpStream Newsletter, Spring 2010

Yellowstone Lake is the subject of exciting research by Jinjun Kan, the microbial ecologist who will join the Stroud Water Research Center in the spring.

Effects of Drilling For Natural Gas

November 8, 2009. Rodale News: Stroud Center scientist Louis Kaplan, Ph.D. was interviewed about the effects of drilling for natural gas on freshwater systems.

UpStream Newsletter, Fall 2009

The Stroud Center and the University of Delaware will study whether human-induced erosion modifies greenhouse gas emissions from the landscape.

Critical Zone Observatory Seeks to Answer Climate Change Questions

Project aims to determine how soil erosion and sediment transport through rivers impact carbon exchange between land and atmosphere, and affect climate.

Using a Bioassay to Measure the Potential Of Polymer Solutions To Support Bacterial Growth

We inoculated test solutions of 15 different polymers used in water treatment with two species of bacteria known to grow on a wide variety of molecules. We then measured the