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Diversity and Distribution of Heavy Metal-Resistant Bacteria in Polluted Sediments of the Ara double dagger a Bay, So Sebastio (SP), and the Relationship Between Heavy Metals and Organic Matter Concentrations

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Autor(es):
Zampieri, Bruna Del Busso ; Pinto, Aline Bartelochi ; Schultz, Leonardo ; de Oliveira, Marcos Antonio ; Cardoso de Oliveira, Ana Julia Fernandes
Número total de Autores: 5
Tipo de documento: Artigo Científico
Fonte: MICROBIAL ECOLOGY; v. 72, n. 3, p. 582-594, OCT 2016.
Citações Web of Science: 12
Resumo

Heavy metals influence the population size, diversity, and metabolic activity of bacteria. In turn, bacteria can develop heavy metal resistance mechanisms, and this can be used in bioremediation of contaminated areas. The purpose of the present study was to understand how heavy metals concentration influence on diversity and distribution of heavy metal-resistant bacteria in Ara double dagger a Bay, So Sebastio, on the So Paulo coast of Brazil. The hypothesis is that activities that contribute for heavy metal disposal and the increase of metals concentrations in environment can influence in density, diversity, and distribution of heavy metal-resistant bacteria. Only 12 % of the isolated bacteria were sensitive to all of the metals tested. We observed that the highest percentage of resistant strains were in areas closest to the So Sebastio channel, where port activity occurs and have bigger heavy metals concentrations. Bacterial isolated were most resistant to Cr, followed by Zn, Cd, and Cu. Few strains resisted to Cd levels greater than 200 mg L-1. In respect to Cr, 36 % of the strains were able to grow in the presence of as much as 3200 mg L-1. Few strains were able to grow at concentrations of Zn and Cu as high as 1600 mg L-1, and none grew at the highest concentration of 3200 mg L-1. Bacillus sp. was most frequently isolated and may be the dominant genus in heavy metal-polluted areas. Staphylococcus sp., Planococcus maritimus, and Vibrio aginolyticus were also isolated, suggesting their potential in bioremediation of contaminated sites. (AU)

Processo FAPESP: 11/50317-5 - Biodiversidade e funcionamento de um ecossistema costeiro subtropical: subsídios para gestão integrada
Beneficiário:Antonia Cecília Zacagnini Amaral
Linha de fomento: Auxílio à Pesquisa - Programa BIOTA - Temático