Inorganic and methylmercury: Do they transfer along a tropical coastal food web?

► Only methylmercury is responsible for Hg bio transference and magnification. ► The greatest biomagnification occurred at the bottom of the food web. ► It involved the transfer of methylmercury from the water column to plankton. ► Feeding habits and vertical trophic guild are important factors. ► They influence methylmercury accumulation, trophic transfer and biomagnification.