Isoscape map of monarchs (IMAGE) University of Ottawa Caption An “isoscape”, or map showing the ratio between heavy and light isotopes over the landscape, for strontium isotope ratios. This isoscape was built from strontium isotope ratios analyzed in plants collected from areas marked by white diamonds. Credit Megan Reich, University of Ottawa Usage Restrictions None License Original 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.