Study lead author, Justine Sauvage (IMAGE) University of Rhode Island Caption Justine Sauvage measures dissolved oxygen in sediment cores collected in the North Atlantic. Credit Photo courtesy Justine Sauvage 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.