Close up of Coral-Algae Competition (IMAGE) University of Hawaii at Manoa Caption Competition between coral and algae on a reef is mediated by the interaction between all of their associated viruses, bacteria and biochemicals. Credit Ty Roach Usage Restrictions Image may be used with appropriate caption and credit 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.