Mercury in a widely consumed fish Micropogonias furnieri (Demarest, 1823) from four main Brazilian estuaries

Mercury in coastal watersheds along the Chinese Northern Bohai and Yellow Seas

“…The [Hg] for all carp was 87 ± 6% with a range of 77-97%, indicating that organic Hg was the predominant form of Hg in the carp [51]. This pattern was also observed in previous studies worldwide [52,53].…”

“…This difference was caused by differences between the bio-dynamics of Hg (II) and MeHg in each species [51,[55][56][57]. The lower ratio of MeHg to Hg in crabs suggests decreased bioaccumulation of MeHg and less toxicity for higher trophic levels [58].…”

“…The lower ratio of MeHg to Hg in crabs suggests decreased bioaccumulation of MeHg and less toxicity for higher trophic levels [58]. Factors, such as habitat type (shallow hard-bottom intertidal or sometimes subtidal habitats) or differences in prey availability, such as macroalgae, salt marsh grasses and small invertebrates between upstream and downstream areas, could explain the difference in the [Hg] and [MeHg] in crab samples [51,[55][56][57][58][59].…”

Mercury speciation changes in waters of the sepetiba Bay, SE Brazil during tidal events and different seasons

“…28 Marins et al 28 showed that the direct atmospheric deposition contributes with only 5% of the total Hg input to the Sepetiba Bay while the fluvial systems contribute with 95%, between 15% to 30% of the total Hg input to the bay accumulate in bottom sediments and 70% to 85% stay cycling within the water column becoming bioavailable for methylation processes and export to the adjacent continental shelf waters. 28,36 In the last years, many studies had been made about the Hg in the sediment, 37,38 in the atmospheric deposition, 39,40 in the fresh and coastal waters [41][42][43][44][45][46] and in the biota 37,47,48 of the Sepetiba Bay, showing the Hg distribution and geochemical in different end-members.…”

“…28 Marins et al 28 showed that the direct atmospheric deposition contributes with only 5% of the total Hg input to the Sepetiba Bay while the fluvial systems contribute with 95%, between 15% to 30% of the total Hg input to the bay accumulate in bottom sediments and 70% to 85% stay cycling within the water column becoming bioavailable for methylation processes and export to the adjacent continental shelf waters. 28,36 In the last years, many studies had been made about the Hg in the sediment, 37,38 in the atmospheric deposition, 39,40 in the fresh and coastal waters [41][42][43][44][45][46] and in the biota 37,47,48 of the Sepetiba Bay, showing the Hg distribution and geochemical in different end-members.Recent studies showed that 16 to 85% of total Hg inputs through the major tributaries of Sepetiba Bay are associated with suspended particulate material (SPM). 44 Annual fluxes of total dissolved and particulate Hg and sediment from major Sepetiba Bay tributaries were estimated by Paraquetti et al 44 as 11 kg year -1 , 190 kg year -1 and 4.8 × 10 8 kg year -1 , respectively.…”