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Turns Case – PFAS Turns Biodiversity



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Turns Case – PFAS Turns Biodiversity

Endocrine disruption turns global bio-d


Shanna Swan 21, environmental medicine and public health professor, “Count Down: How Our Modern World Is Threatening Sperm Counts, Altering Male and Female Reproductive Development, and Imperiling the Future of the Human Race,” Proquest EBook

The point is: The effects of the chemicals we have unleashed into the world are vast and far-reaching, endangering the reproductive health of numerous species and possibly their very survival. Case in point: in a series of studies, University of California, Berkeley, developmental endocrinologist Tyrone Hayes, PhD, investigated the effects of atrazine, an herbicide that's used primarily on corn, soybeans, and other crops in the Midwest and around the world, on the sexual development of wild leopard frogs. He found that exposure to atrazine had a feminizing eft&t on male frogs, leading to gonad abnormalities such as the presence of eggs in their testicles and testosterone levels that are lower than in normal female frogs. Toads have been found to have similarly dysfunctional reproductive responses to various EDCs. Given these reproductive abnormalities, is it any wonder that frogs and toads are undergoing a precipitous population decline throughout the world? One of the most dramatic and widely reported examples of this kind of chemical impact on wildlife came from central Florida. For many years, Lake Apopka, one of the largest freshwater lakes in Florida at 12,500 hectares, was among the most contaminated lakes in the state. This was due to pesticide use in agricultural activities around the lake, a nearby sewage treatment facility, and a 1980 major pesticide spill, of a mixture of dicofol, DDT and its metabolites, and sulfuric acid, from the former Tower Chemical Company, which was adjacent to the lake. These pesticides can act as estrogens, binding to and activating estrogen receptors and inducing cellular growth that's estrogen-dependent.
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