Grand Canyon Reach of the Colorado River (image) Cary Institute of Ecosystem Studies Share Print E-Mail Caption The research team investigated food webs in the Grand Canyon Reach of the Colorado River. Credit Emma Rosi-Marshall Usage Restrictions To promote this release. Share Print E-Mail 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.