Water sampling in a Gwynns Falls stream. (IMAGE) Cary Institute of Ecosystem Studies Caption Water sampling in a Gwynns Falls stream. Credit Credit: Benjamin Glass-Siegel/Baltimore Ecosystem Study Usage Restrictions To promote this research. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.