A tidal sandflat (IMAGE) Max Planck Institute for Marine Microbiology Caption The study location, Janssand, at low tide. The tidal sand flat is located in the German Wadden Sea between the island of Spiekeroog and the mainland. Credit Olivia Bourceau/Max Planck Institute for Marine Microbiology Usage Restrictions Only to be used in the context of this publication and citing the correct copyright. License Original 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.