Yukon River Research (IMAGE) Ecological Society of America Caption USGS scientists conducting research on a boat on the Yukon River, between Eagle and Circle, Alaska. Photo courtesy of Mark Dornblaser, USGS. Credit Mark Dornblaser, USGS Usage Restrictions Mark Dornblaser, USGS. 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.