Assessing Water Flow (IMAGE) University of Wyoming Caption University of Wyoming postdoctoral researcher Mario Bretfeld uses a sensor to assess water flow in a tree in the Panama Canal watershed as part of a project conducted in 2015-16. Results of the research, published this week, show that tropical trees respond to drought differently depending on their ages. Credit Mario Bretfeld 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.