Terrence Nathan and WIlliam Turner IV (IMAGE) University of California - Davis Caption From left, Professor Terrence Nathan and Ph.D. student William Turner IV of the UC Davis Department of Land, Air and Water Resources. Credit UC Davis Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. No derivatives or adaptations of the work are permitted. License CC BY-NC-ND 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.