Gravel-Bed Rivers Video (VIDEO) The University of Montana This video is under embargo. Please login to access this video. Caption University of Montana Professor Ric Hauer, director of the Center for Integrated Research on the Environment, leads a group of authors who looked at the full continuum of species and processes supported by gravel-bed rivers, from microbes to bull trout and from elk to grizzly bears. Credit University of Montana Center for Integrated Research on the Environment 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.