Kristin Saltonstall (IMAGE) Smithsonian Tropical Research Institute Caption Kristin Saltonstall, STRI staff scientist, is fascinated by large, invasive grass species, which often radically change the ecosystems they invade. Credit Sean Mattson Usage Restrictions Please credit Sean Mattson 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.