Image 3 Cyanobacteria (image) Taylor & Francis Group Share Print E-Mail Caption 3) Cyanobacteria (blue-green algae) dominated microbial mat communities cover the floor of meltwater pond on the McMurdo Ice Shelf, Antarctica. The ponds have liquid water in summer and freeze to the bottom in winter. The environmental conditions are extreme and only microbial life can thrive in these unique Antarctic ecosystems. Cyanobacteria dominated microbial mat communities have many adaptation mechanisms such as the production of orange pigments that are UV screens. Credit Taylor & Francis Usage Restrictions Please credit Share Print E-Mail 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.