Functional, biochemical and molecular impact of sediment plumes from deep-sea mining on Mytilus galloprovincialis under hyperbaric conditions

• Tipo: Artigo em Revista Científica Internacional
• Data: 2021

Autores

Pinheiro, M (Autor) Outra; Oliveira, A (Autor) Outra; Barros, S (Autor) Outra; Alves, N (Autor) Outra; Raimundo, J (Autor) Outra; Caetano, M (Autor) Outra; Coimbra, J (Autor) Outra; Neuparth, T (Autor) Outra; Santos, MM (Autor) FCUP

Revista

Título: Environmental Research

Vol. 195

ISSN: 0013-9351

Editora: Elsevier

Indexação

ISI Web of Knowledge - 0 Citações

Scopus - 16 Citações

Outras Informações

ID Authenticus: P-00T-E3C

DOI: 10.1016/j.envres.2021.110753

Abstract (EN): The deep-sea is the biggest ecosystem in the world and despite the extreme conditions that characterize it, is highly biodiverse and complex. Deep-sea mining has been foreseen as a potential and concerning new stressor, and among the deep-sea mining associated stressors, sediment plumes, likely to be released into the water column as a side effect of mining, can reach habitats within a radius of more than a hundred kilometers. The present study examined the effects of suspended sediments of different grain sizes (63-125 mu m, 125-250 mu m and 250-500 mu m) in the model species Mytilus galloprovincialis, at 4 bar, as a proxy to address the potential effects of sediment plumes, in the water column, with different grain sizes under high pressure conditions. Functional (filtration rate - FR), biochemical (catalase - CAT, glutathione s-transferase - GST, lipid peroxidation - LPO) and molecular (gene expression of [actin (ACTN), glutathione S-transferase alpha (GSTA), superoxide dismutase 2 (SOD2), catalase (CAT), heat shock protein 60 (HSP60), cytochrome c oxidase (COI) and DNA mismatch repair protein (MSH6)]) endpoints were studied in juvenile organisms. The FR decreased significantly for all tested grain size ranges, with a more severe effect for the particles with a diameter between 63 and 125 mu m. In addition to the FR, significant changes were also observed for all tested biomarkers. Gene expression was significantly downregulated for CAT and ACTN. Overall, this study demonstrated that the smaller sized particles are the ones leading to more severe effects. Given their high dispersion potential and longer suspension periods under mining operation scenarios, particular attention should be given to the release of sediment plumes that may affect deep-sea environments and the water column. It is, therefore, vital to create standards and guidelines for sustainable mining practices.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8