A diver taking samples (IMAGE) Max Planck Institute for Marine Microbiology Caption A researcher from the Max Planck Institute for Marine Microbiology taking samples in seagrass meadows in the Mediterranean Sea. The measuring device determines the oxygen content in the seabed. Credit Hydra Marine Sciences GmbH Usage Restrictions Only to be used in the context of this publication and citing the correct copyright. 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.