Measuring Gas Exchange in a Small Pond (IMAGE) Yale School of the Environment Caption One of the Connecticut ponds studied by researchers. In the foreground are the jugs they used to disperse propane in the ponds during the experiments. Credit Meredith Holgerson 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.