Experimental Site (IMAGE) University of California - Riverside Caption Photo shows an experimental site at 2,000 meters above sea level where indigenous alpine plants face migrant plant competitors. Credit ETH Zurich/Peter Rüegg. 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.