Source: University of California, Davis, 5/8/25
Sulfur applied to sugarcane crops in South Florida is flowing into wetlands upgradient of Everglades National Park, triggering a chemical reaction that converts mercury into toxic methylmercury, which accumulates in fish, new research from University of California, Davis finds.
In a paper published in Nature Communications, researchers collected water and mosquito fish across wetlands fed by agricultural canals. They documented how sulfur runoff can dramatically increase methylmercury concentrations in fish — sometimes up to 10 million times greater than the waters in which they lived, posing a risk to human health and wildlife. Growers apply sulfur to alkaline soils in South Florida to manage pH levels and increase the availability of nutrients to sugarcane.