Silvopastoral (IMAGE) Smithsonian Tropical Research Institute Caption Over a two-year period, Chavarria and colleagues took weekly samples from streams surrounded by mature forest, young secondary forest, silvo- and traditional pasture at STRI’s Agua Salud site to analyze the bacterial content of the water. Credit Jorge Aleman, Smithsonian Tropical Research Institute Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. License CC BY-NC 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.