Unravelling methylmercury formation in high-altitude Tibetan thermokarst lakes

Key Points

• Methylmercury was detected in high concentrations in the sediment of Tibetan thermokarst lakes, affecting local ecosystems.
• Concentrations of methylmercury reached up to 0.15 mg/kg in some lake sediments, posing risks to wildlife and human health.
• Analysis of sediment samples revealed complex biogeochemical processes that facilitate methylmercury formation in these unique environments.
• Findings suggest a need for further research on mercury cycling in remote lakes, emphasizing the importance of understanding changes in high-altitude ecosystems.