Map of Sampling Locations for Terns (IMAGE) University at Buffalo Caption Chemical pollution continues to threaten Great Lakes-area wildlife. A study found PCBs, PBDEs and metabolites of DDT in the organs of common terns along the Niagara River and shore of Lake Erie. The compounds have not been produced in the U.S. for years. Credit Credit: Bob Wilder / University at Buffalo Usage Restrictions This map may only be published with news stories reporting on the research in the associated news release. 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.