Decades after the chemical factory Velsicol Chemical Corporation spread DDT throughout the city of St. Louis in the state of Michigan, this compound and its derivatives remain there and acute toxicity levels in birds and eggs have been reported. According to what researchers stated in the last Annual Meeting of the Society of Environmental Toxicology and Chemistry.
Led by Matt Zwiernik, environmental toxicologist at the Michigan State University, researchers have found that the birds of the city suffer seizures and injuries and had an extremely low survival rate.
Out of 29 dead birds collected during the study between May and August of 2013, 10 had abnormalities such as brain damage and liver damage. Furthermore, levels of DDT and its products of degradation recorded in the organs were 4,700 micrograms per gram of weight, concentration that is among the highest levels ever recorded in wild birds.
Moreover, DDT concentrations on eggs ranged from about 4000 to 650,000 nanograms per gram of weight, while according to researchers any egg with more than 63,000 nanograms per gram of weight has cero possibilities to hatch.