mercury
; methylmercury derivative
; sulfate
; water pollutant
; animal
; Brachyura
; Brazil
; methylation
; sediment
; water pollutant
; Animals
; Brachyura
; Brazil
; Geologic Sediments
; Mercury
; Methylation
; Methylmercury Compounds
; Sulfates
; Water Pollutants, Chemical
Scopus学科分类:
Agricultural and Biological Sciences: Aquatic Science
; Earth and Planetary Sciences: Oceanography
; Environmental Science: Pollution
英文摘要:
Mercury (Hg) and methylmercury (MeHg) are highly toxic and poorly studied in mangroves. Burrowing Uca crabs change sediment topography and biogeochemistry and thus may affect Hg distribution and MeHg formation. We studied added203Hg distribution, Me203Hg formation and sulfate reduction rates (SRR) in sediment aquariums containing Uca leptodactyla; and analyzed profiles of Me203Hg formation and SRR in sediment cores from two mangroves with distinct environmental impacts. MeHg formation and SRR were higher in the top (≤ 6 cm) sediment and there was no significant difference in Hg methylation in more or less impacted mangroves. In aquariums, crab bioturbation favored Hg retention in the sediment. In the treatment without crabs, Hg volatilization and water Hg concentrations were higher. Hg methylation was higher in bioturbated aquariums but SRR were similar in both treatments. These findings suggest that bioturbating activity favors Hg retention in sediment but also promotes MeHg formation near the surface. � 2016 Elsevier Ltd
Laborat�rio de Tra�adores Wolfgang C. Pfeiffer, Instituto de Biof�sica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Bloco G/CCS/Ilha do Fund�o, Rio de Janeiro (RJ), CEP, Brazil
Recommended Citation:
Correia R.R.S.,Guimar�es J.R.D.. Impacts of crab bioturbation and local pollution on sulfate reduction, Hg distribution and methylation in mangrove sediments, Rio de Janeiro, Brazil[J]. Marine Pollution Bulletin,2016-01-01,109(1)