Sagebrush Field Site (image) Marine Biological Laboratory Caption Field experiments were conducted in a remote area near Utah's Bear Lake where the ecosystem's productivity is limited by both water and nitrogen availability. Credit Zoe Cardon Usage Restrictions Use with photographer credit. 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.