Australian scientists have
discovered a toxic form of mercury in Antarctic’s atmosphere and sea ice. The
study, led by a team from the University of Melbourne, found significant
amounts of methylmercury, an especially dangerous strain of mercury, in the
Southern Ocean, Xinhua news agency reported. Caitlin Gionfriddo, a PhD student
at the University of Melbourne who worked on the project, said the study
revealed that methylmercury released by Antarctic ice into the ocean could be
contaminating the food chain. “There are high levels of methylmercury in our
ecosystems, especially in the marine environment, but we don’t know how it’s
being produced,” Gionfriddo said. “We’re seeing it accumulate in the food web
and most of it likely comes from atmospheric deposition of mercury onto sea
water.”