Diatoms in Antarctica (IMAGE) Georgia Institute of Technology Caption Georgia Tech professor Ellery Ingall studied diatoms and their role in cycling iron in Antarctica. Colonies of diatoms living in the ice typically produce brown layers. Ingall collected samples while onboard the Swedish ship Oden (pictured). Credit Ellery Ingall Usage Restrictions None 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.