Fire in a Cheatgrass-Invaded Ecosystem (IMAGE) University of Massachusetts Amherst Caption Cheatgrass (yellow) in the foreground, dominate only about 6 percent of the Great Basin, but the average fire size is larger than in other ecosystems dominated by sage or pinyon, for example. Credit Mike Pellant, Bureau of Land Management 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.