What environmental factors influence how much methylmercury is in fish?
Methylmercury in macroinvertebrates and fish correlate positively with concentrations of filtered total and methylmercury in stream water; with concentrations of dissolved organic carbon and its chemical form; and with the extent of wetlands within a basin. These factors likely control the supply of aqueous methylmercury to the base of food webs. Food web structure becomes more important when comparing bioaccumulation among streams whose source loads and environmental settings are similar (such as for streams in the same watershed).
