Pontoporia blainville (IMAGE) University of Barcelona Caption The levels of chromium, copper, iron and nickel increased over the 1953-2015 period in the most threatened Cetacean populations of the western Atlantic Ocean Credit Massimiliano Drago, UB-IRBio Usage Restrictions The image may only be used with appropriate caption or credit. 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.