Crampton Lake, Wisconsin (IMAGE) Cary Institute of Ecosystem Studies Caption Once seen as closed ecosystems, research now indicates that lake food chains rely on food resources that originate on land. Credit Steve Carpenter 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.