Water sampling (IMAGE) University of Zurich Caption Taking a water sample for subsequent analysis of the environmental DNA to determine the aquatic insect species. Credit Elvira Mächler/Florian Altermatt, University of Zurich 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.