Clear Cylindrical Enclosures (IMAGE) Arizona State University Caption Clear cylindrical enclosures and a metal grid to support a walkway were temporarily installed in the pond for the duration of the experiment. These mesocosms harbored the original low-nutrient pond community while the rest of the pond was enriched with nutrients. Credit Elser Lab/ASU 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.