The bacterial diversity in a Brazilian non-disturbed mangrove sediment

Abstract

The bacterial diversity present in sediments of a well-preserved mangrove in Ilha do Cardoso, located in the extreme south of São Paulo State coastline, Brazil, was assessed using culture-independent molecular approaches (denaturing gradient gel electrophoresis (DGGE) and analysis of 166 sequences from a clone library). The data revealed a bacterial community dominated by Alphaproteobacteria (40.36% of clones), Gammaproteobacteria (19.28% of clones) and Acidobacteria (27.71% of clones), while minor components of the assemblage were affiliated to Betaproteobacteria, Deltaproteobacteria, Firmicutes, Actinobacteria and Bacteroidetes. The clustering and redundancy analysis (RDA) based on DGGE were used to determine factors that modulate the diversity of bacterial communities in mangroves, such as depth, seasonal fluctuations, and locations over a transect area from the sea to the land. Profiles of specific DGGE gels showed that both dominant ('universal' Bacteria and Alphaproteobacteria) and low-density bacterial communities (Betaproteobacteria and Actinobacteria) are responsive to shifts in environmental factors. The location within the mangrove was determinant for all fractions of the community studied, whereas season was significant for Bacteria, Alphaproteobacteria, and Betaproteobacteria and sample depth determined the diversity of Alphaproteobacteria and Actinobacteria.

Abundance and Genetic Diversity of nifH Gene Sequences in Anthropogenically Affected Brazilian Mangrove Sediments

“…A few previous studies have addressed the microbial diversity in mangroves, most of them reporting taxonomical groups inhabiting this ecosystem and assessing shifts in the community structures in the face of environmental pressures (9,15,23,42). However, the composition and dynamics of the mangrove microbiome are still scarcely explored and understood in terms of its functional groups (2,13,15,32).…”

Sulphur oxidising bacteria in mangrove ecosystem: A review

“…The data revealed that the gammaproteobacteria present were 19.28% of the total bacterial community (Dias et al, 2010). The representatives of these Gamaproteobacterial genera were Acidithiobacillus, Alkalilimnicola, Frateuria, Fulvimonas, Shewanella, Thiorhodospira, and Thiobacillus.…”

Estrutura e função do microbioma de solos brasileiros

“…Dentro da Mata Atlântica, diversos ecossistemas podem ocorrer, dentre os quais estão os manguezais, cujas comunidades microbianas vêrm sendo amplamente descritas em estudos que revelam sua taxonomia (DIAS et al, 2010;DIAS et al, 2011;FASANELLA et al, 2012;SANTOS et al, 2011a) e funcionalidade (GOMES et al, 2008;DIAS et al, 2012;VARON-LOPEZ et al, 2014 …”

“…A primeira imagem que surge ao pensarmos sobre os organismos presentes em solos No Brasil, alguns estudos mostraram que membros dos domínios Bacteria e Archaea estão presentes em abundância e parecem ter importante função na ciclagem de nutrientes e outros processos relacionados à manutenção da capacidade produtiva dos solos desse ecossistema (CURY, 2006;DIAS et al, 2010;DIAS et al, 2011).…”