Four rivers in Amazonian indigenous territories were found to be at a high risk of mercury contamination, above levels considered safe, Agencia Brasil reported this week citing a study by the NGO WWF-Brazil.
Amazon river dolphins are showing alarming levels of contamination mainly because of illegal panning for gold, conservationists say. Researchers measured contamination levels in 46 of these large freshwater creatures known for long, bottle-like snouts in major basins of Brazil, Bolivia, Colombia and Peru.