Tropical Grasslands and Savanna (IMAGE) U.S. National Science Foundation Caption Termite mounds are nutrient hotspots in tropical grasslands and savannas, stabilizing ecosystems. Credit Robert Pringle 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.