Investigating the mechanisms of dissolved organic matter protection against copper toxicity in fish of Amazon's black waters

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Autor(es): dc.contributorCentre Eau Terre Environnement-
Autor(es): dc.contributorBrazilian National Institute for Research of the Amazon (INPA)-
Autor(es): dc.contributorEcoTox LLC-
Autor(es): dc.contributorRSMAS-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorUniversity of British Columbia-
Autor(es): dc.creatorCrémazy, Anne-
Autor(es): dc.creatorBraz-Mota, Susana-
Autor(es): dc.creatorBrix, Kevin V.-
Autor(es): dc.creatorDuarte, Rafael M.-
Autor(es): dc.creatorVal, Adalberto L.-
Autor(es): dc.creatorWood, Chris M.-
Data de aceite: dc.date.accessioned2025-08-21T20:56:49Z-
Data de disponibilização: dc.date.available2025-08-21T20:56:49Z-
Data de envio: dc.date.issued2023-03-01-
Data de envio: dc.date.issued2023-03-01-
Data de envio: dc.date.issued2022-10-15-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.scitotenv.2022.157032-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/240438-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/240438-
Descrição: dc.descriptionWe investigated how natural dissolved organic matter (DOM) of the Rio Negro (Amazon) affects acute copper (Cu) toxicity to local fish: the cardinal tetra (Paracheirodon axelrodi) and the dwarf cichlid (Apistogramma agassizii). It is established that Cu2+ complexation with DOM decreases Cu bioavailability (and thus toxicity) to aquatic organisms, as conceptualized by the Biotic Ligand Model (BLM). However, we also know that Rio Negro's DOM can interact with fish gills and have a beneficial effect on Na+ homeostasis, the main target of acute Cu toxicity in freshwater animals. We aimed to tease apart these potential protective effects of DOM against Cu-induced Na+ imbalances in fish. In the laboratory, we acclimated fish to Rio Negro water (10 mg L−1 DOC) and to a low-DOM water (1.4 mg L−1 DOC) with similar ion composition and pH (5.9). We measured 3-h Cu uptake in gills and unidirectional and net Na+ physiological fluxes across a range of Cu concentrations in both waters. Various DOM pre-acclimation times (0, 1 and 5 days) were evaluated in experiments with P. axelrodi. Copper exposure led to similar levels of net Na+ loss in the two fish, but with distinct effects on Na+ influx and efflux rates reflecting their different ionoregulation strategies. Rio Negro DOM protected against Cu uptake and toxicity in the two fish species. Both Cu uptake in fish gills and Na+ regulation disturbances were relatively well predicted by the modelled aqueous free Cu2+ ion concentration. These findings suggest that protection by DOM occurs mainly from Cu complexation under the tested conditions. The prevalence of this geochemical-type protection over a physiological-type protection agrees with the BLM conceptual framework, supporting the use of the BLM to assess the risk of Cu in these Amazonian waters.-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionNatural Sciences and Engineering Research Council of Canada-
Descrição: dc.descriptionInstitut National de la Recherche Scientifique Centre Eau Terre Environnement-
Descrição: dc.descriptionLaboratory of Ecophysiology and Molecular Evolution Brazilian National Institute for Research of the Amazon (INPA), AM-
Descrição: dc.descriptionEcoTox LLC-
Descrição: dc.descriptionUniversity of Miami RSMAS-
Descrição: dc.descriptionBiosciences Institute São Paulo State University - UNESP, Coastal Campus-
Descrição: dc.descriptionDepartment of Zoology University of British Columbia-
Descrição: dc.descriptionBiosciences Institute São Paulo State University - UNESP, Coastal Campus-
Descrição: dc.descriptionCNPq: 401303/2014-4-
Descrição: dc.descriptionNatural Sciences and Engineering Research Council of Canada: RG-PIN 2017-03843-
Idioma: dc.languageen-
Relação: dc.relationScience of the Total Environment-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectApistogramma agassizii-
Palavras-chave: dc.subjectCopper-gill binding-
Palavras-chave: dc.subjectDissolved organic carbon-
Palavras-chave: dc.subjectParacheirodon axelrodi-
Palavras-chave: dc.subjectRio Negro-
Palavras-chave: dc.subjectSodium fluxes-
Título: dc.titleInvestigating the mechanisms of dissolved organic matter protection against copper toxicity in fish of Amazon's black waters-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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