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Research

Soil Microbes and Bean Nutrients in Organic and Conventional Systems

800 532 Stroud Water Research Center

Little is known regarding soil microbes and nutrition levels in vegetables under various farming practices. This project measures soil microbial community structure, extracellular enzyme activity, and nutrient density in green…

Using Microbial Source Tracking to Identify Potential Bacterial Sources in White Clay Creek

800 532 Stroud Water Research Center

Scientists monitor fecal indicator bacteria in White Clay Creek during summer and identify potential bacterial contamination by molecular microbial source tracking. The goal is to determine where the bacteria likely…

Watershed-Scale Evaluation of Restoration Practices on Water Quality Improvement

800 532 Stroud Water Research Center

To evaluate how watershed restoration practices improve stream health and water quality, scientists are monitoring nutrient and sediment loads and macroinvertebrates before, during, and after restoration. (Project details may change…

Where Are the Brook Trout? Novel Application of eDNA to Locate Infrequent Species

800 532 Stroud Water Research Center

Scientists are using environmental DNA to determine whether wild brook and brown trout populations are in streams near Stroud Water Research Center, including in streams where watershed restoration practices have…

White Clay Creek Fish Passage Assessment

800 532 Stroud Water Research Center

This project examines whether the lower White Clay Creek in Delaware provides suitable habitat for migratory fish like American shad. Funded by: White Clay Creek Wild and Scenic Project Lead:…

Publication title with image of a mayfly

Surface water quality impacts from organic versus conventional agricultural systems

350 210 Stroud Water Research Center

Bier, R., M. Daniels, D. Oviedo-Vargas, M. Peipoch, E. Kelsick, and J. Kan. 2026. Journal of Environmental Quality 55(4): e70208.

Biological Nitrogen Removal in Sediment Plumes: A Critical but Missing Component of Watershed Models

800 532 Stroud Water Research Center

During storms, sediment plumes play a crucial role in the export of nutrients from rivers. This project investigates the changes in nutrient concentrations within these plumes.Understanding how biological processes alter…

Ecotoxicity Study for Mayflies Exposed to Elevated Concentrations of Chloride at Different Temperatures

800 532 Stroud Water Research Center

Chloride concentrations in surface waters have been increasing over the last several decades at multiple locations throughout the United States. At times, it appears that ambient chloride concentrations now reach…

Evaluating How Conventional, Conservation, and Organic Farming Management Practices Enhance Soil Health and Improve Water Quality

800 532 Stroud Water Research Center

This project investigates how different agricultural management practices influence water quality and soil health. Using Rodale Institute’s 37-year-old Farming Systems Trial and a recent transition to organic farming at the…

Diana Oviedo Vargas, Ph.D., collects biosolid samples to test for PFAS.

Evaluating the Risk for PFAS Contamination of Surface and Groundwater Through Application of Biosolids in Agroecosystems

800 450 Stroud Water Research Center

Scientists are investigating whether biosolid application on Pennsylvania farms represents a significant source of PFAS in soils and water. Per- and polyfluoroalkyl substances, commonly called PFAS, are a group of…