Produção Nacional
Revisado por pares
Microbial indicators along a metallic contamination gradient in tropical coastal sediments
2022; Elsevier BV; Volume: 443; Linguagem: Inglês
10.1016/j.jhazmat.2022.130244
ISSN1873-3336
AutoresVanessa Almeida Moreira, Cristiana Cravo‐Laureau, Ângelo Cezar Borges de Carvalho, Alice Baldy, Edison Dausacker Bidone, Elisamara Sabadini-Santos, Robert Duran,
Tópico(s)Mine drainage and remediation techniques
ResumoThe structure and diversity of microbial community inhabiting coastal sediments reflect the exposition to contaminants. Aiming to assess the changes in the microbiota from Sepetiba Bay (SB, Brazil) sediments, correlations between the 16S rRNA gene data (V4-V5 region), metal contamination factors (CF), and the ecological risk classification provided by the Quality Ratio (QR) index were considered. The results show that microbial diversity differs significantly between the less (SB external sector) and the most (SB internal sector) polluted sectors. Also, differences in the microbial community structure regarding the ecological risk classifications validated the QR index as a reliable tool to report the SB chronic contamination. Microbial indicator genera resistant to metals (Desulfatiglans, SEEP-SRB1, Spirochaeta 2, among others) presented mainly anaerobic metabolisms. These genera are related to the sulfate reducing and methanogenic metabolisms probably participating in the natural attenuation processes but also associated with greenhouse gas emissions. In contrast, microbial indicator genera sensitive to metals (Rubripirellula, Blastopirellula, Aquibacter, among others) presented mainly aerobic metabolisms. It is suggested that future works should investigate the metabolic functions to evaluate the influence of metallic contaminants on microbial community inhabiting SB sediment.
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