The Santa Rita Experimental Range South of Tucson, Ariz. (image) University of Arizona Share Print E-Mail Caption The University of Arizona's Santa Rita Experimental Range is the oldest, longest-operating range-land research facility in the world. Using techniques like repeat photography, inclusion or exclusion of livestock and vegetation surveys since the 1950s, scientists study how ecosystems react to different influences such as climate change and grazing. Credit Mitchel McClaran/University of Arizona Usage Restrictions This visual may only be used in conjunction with reporting/posting of this news release. Image/video credit must be included exactly as indicated. Share Print E-Mail 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.