title: Potential of the Biotic Ligand Model (BLM) to Predict Copper Toxicity in the White-Water of the Solimões-Amazon River.
abstract: In this study, we evaluated the capacity of the Biotic Ligand Model (BLM) to predict copper toxicity in white-waters of the Solimões-Amazon River. LC50tests using the species Otocinclus vittatus (Regan, 1904) were performed with Solimões-Amazon river water (100%) at 20%, 40%, 60%, and 80% dilutions. A sevenfold decrease in both dissolved and total Cu toxicity was observed in the experiment conducted with 100% when compared to 20% white-water, indicating that physicochemical characteristics of white-water attenuate Cu toxicity. There was agreement between the observed LC50and the LC50predicted by the BLM after the adjustment of critical accumulation concentration (LA50) for O. vittatus. BLM modeling indicated that dissolved organic carbon (DOC) and pH were the most important water parameters influencing Cu toxicity, followed by Ca2+. Our results highlight the first evidence that the BLM presents potential to predict Cu toxicity to aquatic organisms in the white-water of the Solimões-Amazon River.
authors.affiliation: Laboratório de Estudos em Estresse Animal, Departamento de Fisiologia, Universidade Federal do Paraná, Curitiba, Parana, ZIP 81531-970, Brazil. giorgidalpont@gmail.com.|Laboratório de Ecofisiologia e Evolução Molecular, Instituto Nacional de Pesquisas da Amazônia (INPA), Manaus, Amazonas, ZIP 69060-001, Brazil. giorgidalpont@gmail.com.
authors.forename: Giorgi Dal
authors.initials: GD
authors.lastname: Pont
authors.affiliation: Laboratório de Ecofisiologia e Evolução Molecular, Instituto Nacional de Pesquisas da Amazônia (INPA), Manaus, Amazonas, ZIP 69060-001, Brazil.
authors.forename: Fabíola Xochilt Valdez
authors.initials: FX
authors.lastname: Domingos
authors.affiliation: Laboratório de Estudos em Estresse Animal, Departamento de Fisiologia, Universidade Federal do Paraná, Curitiba, Parana, ZIP 81531-970, Brazil.
authors.forename: Marisa
authors.initials: M
authors.lastname: Fernandes-de-Castilho
authors.affiliation: Laboratório de Ecofisiologia e Evolução Molecular, Instituto Nacional de Pesquisas da Amazônia (INPA), Manaus, Amazonas, ZIP 69060-001, Brazil.
authors.forename: Adalberto Luis
authors.initials: AL
authors.lastname: Val
mesh_terms: D003300:Copper / Q000032:analysis / Q000633:toxicity*; D008024:Ligands; D045483:Rivers / Q000737:chemistry*; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000633:toxicity*
chemical_list: D008024:Ligands; D014874:Water Pollutants, Chemical; D014867:Water; D003300:Copper
keywords: Bioavailability; Metal toxicity; Toxicity prediction; Tropical aquatic environment; Water chemistry