Tracking organic mercury bioaccumulation by the brown mussel Perna perna (Linnaeus, 1758) in subtropical bays: Environmental exposure and seasonal effects. - 2026
Tracking organic mercury bioaccumulation by the brown mussel Perna perna (Linnaeus, 1758) in subtropical bays: Environmental exposure and seasonal effects.
Galvao, Petrus; Longo, Renan L; Lino, Adan Set al.
2026 • In Marine Pollution Bulletin, 228, p. 119510
[en] The brown mussel (Perna perna) is a key aquaculture species and sentinel for coastal pollution. We investigated the bioaccumulation of total mercury (THg), total organic mercury (TotOrgHg), and monomethylmercury (MMHg) in P. perna from aquaculture farms in three subtropical Brazilian bays with contrasting anthropogenic pressures. Over eight months, mercury species were quantified in mussel tissue, sediments, and suspended solids. Environmental parameters (sediment organic matter) and mussel physiological traits (lipid content, condition index) were assessed. Stable carbon and nitrogen isotope ratios (δ13C, δ15N) were analysed to evaluate trophic influences. Median THg in mussels (41.9 μg·kg-1) was approximately half that in sediments (96.3 μg·kg-1) and suspended solids (73.8 μg·kg-1), showing lower THg_Muss medians than Sed and SS. Lipid content and condition index negatively correlated with TotOrgHg and THg, indicating a biodilution effect. A moderate correlation was found between TotOrgHg and MMHg, highlighting limitations of TotOrgHg as a proxy for MMHg. δ15N correlated with %MMHg only in the least impacted bay, suggesting trophic modulation of methylation under lower contamination. The human health risk assessment showed that a 60 kg adult could exceed the tolerable weekly intake for MMHg by consuming fewer than five mussels weekly. These findings confirm P. perna as an effective biomonitor and provide new insights into the drivers of mercury speciation in tropical coastal aquaculture.
Research Center/Unit :
FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège
Galvao, Petrus; Programa de Geociências (Geoquímica) - Universidade Federal Fluminense, Niterói, RJ, Brazil, Laboratório de Ecossistemas e Mudanças Globais - Universidade Federal Fluminense, Niterói, RJ, Brazil. Electronic address: petrusmagnusbrazil@gmail.com
Longo, Renan L; Laboratório de Estudos Ambientais Olaf Malm, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
Lino, Adan S; Laboratório de Estudos Ambientais Olaf Malm, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
Michel, Loïc ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Systématique et diversité animale
Aguiar, Valquiria M C; Departamento de Geoquímica, Instituto de Química, Outeiro São João Batista, s/n, Niterói, RJ, Brazil
Araújo, Daniel F; Ifremer, CCEM - Contamination Chimique des Ecosystèmes Marins, F-44000, Nantes, France
Torres, João P M; Laboratório de Micropoluentes Orgânicos Jan Japenga, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
Malm, Olaf; Laboratório de Estudos Ambientais Olaf Malm, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
Ribeiro, Humberto Marotta; Programa de Geociências (Geoquímica) - Universidade Federal Fluminense, Niterói, RJ, Brazil, Laboratório de Ecossistemas e Mudanças Globais - Universidade Federal Fluminense, Niterói, RJ, Brazil
Dorneles, Paulo Renato ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanographie biologique
Das, Krishna ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanographie biologique
Language :
English
Title :
Tracking organic mercury bioaccumulation by the brown mussel Perna perna (Linnaeus, 1758) in subtropical bays: Environmental exposure and seasonal effects.
CONFAP - Conselho Nacional das Fundações Estaduais de Amparo à Pesquisa FAPERJ - Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro WBI - Wallonie-Bruxelles International F.R.S.-FNRS - Fonds de la Recherche Scientifique CNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
Funding text :
The authors are pleased to thank Mr. Glauco, the local shellfisherman from Guanabara Bay, for providing all the logistical support in the fieldwork. We also thank Castelo Branco University for collaborating with us and using their experimental mussel farm in Sepetiba Bay. The Instituto de Ecodesenvolvimento da Ba\u00EDa de Ilha Grande (POMAR Project) made sampling feasible at Ilha Grande Bay, so we are deeply grateful for their association in this work. Dr. Petrus Galvao is supported by FAPERJ (E-26/200.773/2023). This work was funded through scientific cooperation between the Brazilian National Council of State Funding Agencies (CONFAP), for Brazil, and Carlos Chagas Filho Research Foundation of Rio de Janeiro state (FAPERJ), for Rio de Janeiro state (RJ), as well as Wallonie-Bruxelles International (WBI), for Belgium [\u201CCall CONFAP & Wallonie Bruxelles \u2013 Belgium \u2013 FAPERJ (2024)\u201D (FAPERJ process numbers E-26/202.125/2025 and E-26/202.126/2025)], coordinated by PRD and KD. PRD has a research grant from CNPq (303074/2025-6). KD is funded by F.R.S. - FNRS.
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