[en] Estuarine regions are highly valuable ecosystems due to their high biological productivity and their role in providing food and habitats for numerous species. However, in the densely populated Southeast region of Brazil, these ecosystems face significant human-induced degradation and pollution. This study examined hepatic concentrations of selenium (Se), manganese (Mn), and cadmium (Cd) in five fish species from Sepetiba Bay (SB), Rio de Janeiro, Brazil, and explored their relationship with trophic position (δ15N). Our findings showed that Se concentrations increased significantly with trophic level when Trichiurus lepturus was excluded from the analysis (r2 = 0.45, p = 0.0002), suggesting a potential for Se biomagnification in species sharing similar feeding zones. In contrast, Mn exhibited no correlation with trophic position, and the hypothesis that lower trophic level species would show higher Mn levels was not supported. Cd accumulation appeared to be species-specific, possibly linked to benthic invertebrate consumption and historical contamination in the bay. Additionally, T. lepturus showed a strong positive correlation between Se and Cd concentrations (Spearman r = 0.86, p = 0.0107), suggesting potential detoxification mechanisms, as well as evidence of biodilution, indicated by the negative correlation between Cd and body mass (Pearson r = -0.83, p = 0.0116). These results highlight the influence of trophic ecology on trace element dynamics in estuarine food webs. Given the ecological and economic importance of these fish, our findings contribute to environmental risk assessments and reinforce the need for continued monitoring in anthropogenically impacted tropical estuaries.
Research Center/Unit :
FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège
Paiva, T C; Instituto de Ciências Biológicas, Laboratório of Limnologia, Ecotoxicologia, e Ecologia Aquática, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte, MG, Brazil, Instituto de Biofísica Carlos Chagas Filho, Laboratorio de Estudos Ambientais Olaf Malm, Universidade Federal do Rio de Janeiro, 21941-900, Rio de Janeiro, RJ, Brazil. Electronic address: thaispaiva@biof.ufrj.br
Souza-Kasprzyk, J ; Instituto de Biofísica Carlos Chagas Filho, Laboratorio de Estudos Ambientais Olaf Malm, Universidade Federal do Rio de Janeiro, 21941-900, Rio de Janeiro, RJ, Brazil, Department of Analytical Chemistry, Faculty of Chemistry, Adam Mickiewicz University, Ul. Uniwersytetu Poznańskiego 8, 61-614, Poznań, Poland
Padilha, J A G; Centre for Molecular and Environmental Biology/Aquatic Research Network & Institute of Science and Innovation for Bio-Sustainability, Department of Biology, University of Minho, Campus Gualtar, 4710-057, Braga, Portugal
Das, Krishna ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanographie biologique
Bisi, T L; Laboratório de Mamíferos Aquáticos e Bioindicadores ''Profa. Izabel Gurgel'', Faculdade de Oceanografia, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier, 524, Sala 4002, Maracanã, CEP 20550-013, Rio de Janeiro, RJ, Brazil
Azevedo-Silva, C E; Instituto de Biofísica Carlos Chagas Filho, Laboratorio de Estudos Ambientais Olaf Malm, Universidade Federal do Rio de Janeiro, 21941-900, Rio de Janeiro, RJ, Brazil
Azevedo, A F; Laboratório de Mamíferos Aquáticos e Bioindicadores ''Profa. Izabel Gurgel'', Faculdade de Oceanografia, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier, 524, Sala 4002, Maracanã, CEP 20550-013, Rio de Janeiro, RJ, Brazil
Lailson-Brito, J; Laboratório de Mamíferos Aquáticos e Bioindicadores ''Profa. Izabel Gurgel'', Faculdade de Oceanografia, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier, 524, Sala 4002, Maracanã, CEP 20550-013, Rio de Janeiro, RJ, Brazil
Malm, O; Instituto de Biofísica Carlos Chagas Filho, Laboratorio de Estudos Ambientais Olaf Malm, Universidade Federal do Rio de Janeiro, 21941-900, Rio de Janeiro, RJ, Brazil
Dorneles, Paulo Renato ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanographie biologique ; Instituto de Biofísica Carlos Chagas Filho, Laboratorio de Estudos Ambientais Olaf Malm, Universidade Federal do Rio de Janeiro, 21941-900, Rio de Janeiro, RJ, Brazil
Language :
English
Title :
Trophic influence on selenium, cadmium, and manganese accumulation in fish from tropical estuary (Sepetiba Bay, Brazil).
FAPERJ - Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro CAPES - Coordination of Higher Education Personnel Improvement F.R.S.-FNRS - Fonds de la Recherche Scientifique CNPq - National Council for Scientific and Technological Development UERJ - Universidade do Estado do Rio de Janeiro WBI - Wallonie-Bruxelles International
Funding text :
We appreciate the contribution of Adriana Rodrigues de Lira Pessoa for reviewing a draft of the manuscript. TCP thanks CNPq for her scholarship and Rayane Moreira de Castro for assistance in teaching the method for metal determination. This work was funded through scientific cooperation between the Brazilian Foundation for the Coordination and Improvement of Higher Level or Education Personnel (CAPES \u2013 process numbers 88881.154725/2017-01 and 88887.154724/2017\u201300) and Wallonie Bruxelles International (WBI, from Belgium), coordinated by PRD and KD. KD is funded by the Fonds de la Recherche Scientifique - FNRS. OM and PRD have research grants from CNPq (process numbers 314497/2020-0 and 303074/2025\u20136, respectively). AFA, JLB and TLB also received the support from CNPq grants PQ-1B (process number: 307458/2022-9), PQ-1D (process number: 315.276/2021-5), PQ-2 (process number: 308879/2023-6), respectively; as well as from the Rio de Janeiro State Government Research Agency (FAPERJ) through the Cientista do Nosso Estado program (CNE E-26/200.397/2023) and the Jovem Cientista do Nosso Estado program (JCNE E-26/201.318/2022), and from UERJ (Proci\u00EAncia Program).
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