In some studies results have been shown significance relationship between deforestation and methyl mercury for which bio accumulated in fish tissues and cause environmental problems.

In some cases that relationship didn't indicate strong correlation,so it's a question why in some streams concentration of Mercury isn't so high even deforestation is continued, so there are some factors that control it.



It might be free Iron in sediments and soil particles.Could be!

Use of Iron to Control of Methylmercury Formation in Wetlands