Ecosystem Services in Streams (IMAGE) University of Georgia Caption Forest-derived carbon, such as leaves and wood, provides essential ecosystem services in streams. The effects of nutrient pollution on this carbon source are poorly understood compared to the well-known effects of nutrients on algae. Credit Phillip M. Bumpers/University of Georgia Usage Restrictions None License Licensed 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.