Corals and sunlight (IMAGE) Penn State Caption Penn State researchers analyzed the productivity and biodiversity in the world’s symbiotic coral communities and found that the maintenance of water optical quality in coral reefs is fundamental to protect coral biodiversity and prevent reef degradation. Credit Tomás López-Londoño / Penn State 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.