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The effects of mining tailings in the physiology of benthic algae: Understanding the relation between mud's inductive acidification and the heavy metal's toxicity

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Costa, Giulia Burle [1] ; Ramlov, Fernanda [2] ; Koerich, Gabrielle [1] ; Navarro, Bruno Bachiega [2] ; Cabral, Debora [2] ; Oliveira Rodrigues, Eva Regina [2] ; Ramos, Bruna [1] ; Fadigas, Samara Dumont [1] ; Rorig, Leonardo Rubi [3] ; Maraschin, Marcelo [2] ; Horta, Paulo A. [1]
Número total de Autores: 11
Afiliação do(s) autor(es):
[1] Univ Fed Santa Catarina, Bot Dept, Phycol Lab, BR-88049900 Florianopolis, SC - Brazil
[2] Univ Fed Santa Catarina, Plant Morphogenesis & Biochem Lab, BR-88049900 Florianopolis, SC - Brazil
[3] Univ Fed Santa Catarina, Bot Dept, Phycol Microalgae Lab, BR-88049900 Florianopolis, SC - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Citações Web of Science: 0

The direct and indirect effects of mining tailing on macroalgae were evaluated in vitro to determine the relationship between heavy metals toxicity and pH alterations caused by the presence of pollutants. The marine brown seaweed Sargassum cymosum (C. Hagard 1820) and its main epiphytic alga, the red seaweed Hypnea pseudomusciformis (Nauer, Cassano, Oliveira, 2015), were exposed to Mariana's mud in cross treatments, including presence or absence of mud, and normal ((similar to)8.0) or acidic ((similar to)7.0) pH conditions. The effects of different biological conditions were also evaluated in two treatments, with seaweed in isolated or associative conditions, for a seven-day period. The measured variables were growth rates and metabolic descriptors, such as chlorophyll a, phenolic compounds, total proteins, and the analysis of enzymatic activity, e.g. catalase (CAT), guaiacol peroxidase (GPX), and superoxide dismutase (SOD). Kruskal-Wallis and post-hoc Dunn's test were performed to evaluate the significant differences among treatments and biological conditions. Decreased growth rates in treatments with presence of mud or in acidic conditions were detected and probably related to deviations of metabolic energy towards the synthesis of defensive metabolites. Especially in the acidified culture medium, both algae species presented significant declines in pigments concentration, antioxidant compounds and an accentuated inhibition of enzymatic activity. The algal association was not beneficial for either species and H. pseudomusciformis was responsible for reducing the defensive ability of Sargasswn against stressors. Considering the results, we infer that the physiological ability of both algae to resist metals and/or acidified conditions was affected not only by their mutual interference in each other, but also by the interaction between the abiotic parameters evaluated in this study. (AU)

Processo FAPESP: 14/00012-1 - Diversidade e filogenia do complexo Laurencia (Rhodophyta) no Oceano Atlântico tropical e subtropical
Beneficiário:Valéria Cassano
Linha de fomento: Auxílio à Pesquisa - Regular