Calcium Concentration (IMAGE) Max Planck Institute for Chemical Ecology Caption The image shows the amounts of light accumulated over a period of 30 minutes, highlighting the changing calcium concentrations. These are represented by a color code (blue=low, red=high). The arrow points to an area where a cotton leafworm (Spodoptera littoralis) and two Arabidopsis thaliana leaves are located in a small cage. Credit Victoria Kiep / Martin Luther University, Halle-Wittenberg; Jyothilakshmi Vadassery / Max Planck Institute for Chemical Ecology 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.