Microbial mat ecosystems (IMAGE) Johns Hopkins University Caption For eons microbial mats have hosted a diverse array of life from the microscopic organisms vital to the survival of the ecosystem. Credit Johns Hopkins University Usage Restrictions None 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.