Erik Björn at the Mesocosm Facility (IMAGE) Umea University Caption Erik Björn, associate professor at Umeå University, is collecting water samples from a tap mounted at the base of a 5 meter high mesocosm tank. Credit Mattias Pettersson Usage Restrictions This photo may only be used in contexts related to this news release. Please give credit to the photographer. 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.