One Tree Reef (IMAGE) University of Sydney Caption University of Sydney researchers have analysed samples from One Tree Reef in the southern Great Barrier Reef and discovered a dramatic slow down following a small fall in sea level. Credit None needed 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.