Growth Rings in Tundra Willow Shrub (IMAGE) University of Edinburgh Caption Scientists are using ring growth data, like these shown in a willow shrub, to assess the age and growth of shrubs in a huge study of the Arctic tundra. Credit Isla Myers-Smith 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.