Genotoxic effect of heavy metals on Astyanax lacustris in an urban stream
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2020-09-18
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Uncontrolled urbanization growth contributes to the pollution of aquatic environments. Heavy metals released by
domestic and industrial effluents can negatively affect aquatic organisms. This study aimed to evaluate the effect
of environmental pollutants, such as metals, on fish DNA damage, in stretches of an urban stream. Specimens of
the Neotropical fish, Astyanax lacustris, were exposed in situ for 96 h along the Antas stream, a Brazilian aquatic
system deteriorated by anthropogenic factors. Water and sediment samples were collected simultaneously for
physicochemical and heavy metal analyses. The comet assay was performed as a biomarker of genotoxicity. Fish
located downstream had a higher frequency of DNA damage than in the reference site. We found concentrations
of Cr and Ni above acceptable levels in sediment samples. Generally, Ba, Mn, Mg, Zn, Cr, and Ni were the elements
most associated with genotoxic damage. Water and sediment of the Antas stream showed genotoxic potential in
A. lacustris according to the urbanization gradient, demonstrating the importance to prevent the release of
environmental pollutants, especially heavy metals in urban areas.
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Environmental science, Environmental analysis, Environmental chemistry, Environmental pollution, Environmental toxicology, Fish Heavy metals, DNA damage, Pollution Comet assay
Citação
SILVA, Emanoelle Pereira da et al. Genotoxic effect of heavy metals on Astyanax lacustris in an urban stream. Heliyon, London, v. 6, n. 9, e05034, 2020. DOI: 10.1016/j.heliyon.2020.e05034. Disponível em: https://www.cell.com/heliyon/fulltext/S2405-8440(20)31877-6?_returnURL=https%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS2405844020318776%3Fshowall%3Dtrue. Acesso em: 26 abr. 2024.