DDT lingers in Michigan town
High levels of banned chemical found in birds, eggs
By Beth Mole
VANCOUVER — Decades after a chemical plant spewed DDT throughout St. Louis, Mich., the harmful insecticide lingers, reaching acutely toxic levels in birds and their eggs, researchers reported November 13 at the annual meeting of the Society of Environmental Toxicology and Chemistry.
Led by environmental toxicologist Matt Zwiernik of Michigan State University in East Lansing, researchers found that the town’s birds suffer from seizures and lesions, and had extremely low survival rates.
Of 29 dead birds collected between May and August 2013, 10 had gross organ abnormalities, including brain and liver lesions. Levels of DDT and its breakdown products topped 4,700 micrograms per gram of weight in the birds’ organs. Those concentrations are among the highest levels ever recorded in wild birds.