Species and Glaciation (IMAGE) Spanish National Research Council (CSIC) Caption Relationship between species richness and temperature variation since the last glaciation. The red line represents the current limit of 0 C and the blue one such limit in the last glaciation. The discontinuous black line identifies the border between north and south marked by differences in species distributions. Credit J. Hortal 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.