Light Levels Shown as Colored Shading (IMAGE) University of California - Santa Barbara Caption Light levels are shown as colored shading: magenta lines mark out low-nutrient regions and black lines show regions affected by sea-ice formation. Credit UCSB 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.