Please use this identifier to cite or link to this item:
https://www.arca.fiocruz.br/handle/icict/15994
Type
ArticleCopyright
Open access
Collections
- IOC - Artigos de Periódicos [12642]
Metadata
Show full item record
MICROBIAL DIVERSITY OF A BRAZILIAN COASTAL REGION INFLUENCED BY AN UPWELLING SYSTEM AND ANTHROPOGENIC ACTIVITY
Sistema de ressurgência
Atividade antropogênica
Região Costeira
Brasil
Author
Affilliation
Universidade Federal do Rio de Janeiro. Laboratório de Ecologia Molecular Microbiana. Rio de Janeiro, RJ, Brasil / Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biologia Computacional e Sistemas. Rio de Janeiro, RJ, Brasil.
Universidade do Estado do Rio de Janeiro. FFP. DCEIN. Laboratório de MIcrobiologia. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. INPeTAm/IBCCF. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. Laboratório de Ecologia Molecular Microbiana. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biologia Computacional e Sistemas. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. Laboratório de Ecologia Molecular Microbiana. Rio de Janeiro, RJ, Brasil
Universidade do Estado do Rio de Janeiro. FFP. DCEIN. Laboratório de MIcrobiologia. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. INPeTAm/IBCCF. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. Laboratório de Ecologia Molecular Microbiana. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biologia Computacional e Sistemas. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. Laboratório de Ecologia Molecular Microbiana. Rio de Janeiro, RJ, Brasil
Abstract
Background: Upwelling systems are characterised by an intense primary biomass production in the surface (warmest) water
after the outcrop of the bottom (coldest) water, which is rich in nutrients. Although it is known that the microbial
assemblage plays an important role in the food chain of marine systems and that the upwelling systems that occur in
southwest Brazil drive the complex dynamics of the food chain, little is known about the microbial composition present in
this region.
Methodology/Principal Findings: We carried out a molecular survey based on SSU rRNA gene from the three domains of
the phylogenetic tree of life present in a tropical upwelling region (Arraial do Cabo, Rio de Janeiro, Brazil). The aim was to
analyse the horizontal and vertical variations of the microbial composition in two geographically close areas influenced by
anthropogenic activity (sewage disposal/port activity) and upwelling phenomena, respectively. A lower estimated diversity
of microorganisms of the three domains of the phylogenetic tree of life was found in the water of the area influenced by
anthropogenic activity compared to the area influenced by upwelling phenomena. We observed a heterogenic distribution
of the relative abundance of taxonomic groups, especially in the Archaea and Eukarya domains. The bacterial community
was dominated by Proteobacteria, Cyanobacteria and Bacteroidetes phyla, whereas the microeukaryotic community was
dominated by Metazoa, Fungi, Alveolata and Stramenopile. The estimated archaeal diversity was the lowest of the three
domains and was dominated by uncharacterised marine Crenarchaeota that were most closely related to Marine Group I.
Conclusions/Significance: The variety of conditions and the presence of different microbial assemblages indicated that the
area of Arraial do Cabo can be used as a model for detailed studies that contemplate the correlation between pollutionindicating
parameters and the depletion of microbial diversity in areas close to anthropogenic activity; functional roles and
geochemical processes; phylogeny of the uncharacterised diversity; and seasonal variations of the microbial assemblages.
Keywords in Portuguese
Diversidade microbianaSistema de ressurgência
Atividade antropogênica
Região Costeira
Brasil
Share