Black Tip Reef Shark (image) PeerJ Caption A black tip reef shark swims over a large table-top Acropora coral colony in the remote Southern Line Islands. This image shows the coupling of healthy benthic communities, as seen by the high cover of calcifying organisms and high abundance of top predators in coral reef systems. Credit Jennifer Smith Usage Restrictions None 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.