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. LC50 tests 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 LC50 and the LC50 predicted 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.
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Funding was provided by International Copper Association (ICA) and a joint grant from the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) from Brazil and Fundação de Amparo à Pesquisa do Estado do Amazonas (FAPEAM) to the Instituto Nacional de Ciência e Tecnologia—Adaptações da Biota Aquática da Amazônia (INCT ADAPTA). We thank C. Wood and M. T. Grassi for helpful comments on the manuscript. Tania Ng for the help on modeling and also R. Duarte, K. Y. da Silva and R. Figueiredo for all inputs during the experimental phase. ALV is a recipient of a research fellowship from Brazil/CNPq.
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Pont, G.D., Domingos, F.X.V., Fernandes-de-Castilho, M. et al. Potential of the Biotic Ligand Model (BLM) to Predict Copper Toxicity in the White-Water of the Solimões-Amazon River. Bull Environ Contam Toxicol 98, 27–32 (2017). https://doi.org/10.1007/s00128-016-1986-1
- Metal toxicity
- Toxicity prediction
- Tropical aquatic environment
- Water chemistry