Cyanobacterial Composition of Microbial Mats, Found in Brejo do Espinho and in Artificial Saline of Araruama, RJ, Brazil

Fabiane Feder, Deise O. Delfino, Maria D. Wanderley, Loreine H. Silva e Silva

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Geology Department, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.

DOI: 10.4236/aim.2013.36A006                

Abstract

Microbial mats are organo-sedimentary ecosystems formed by autotrophic and heterotrophic bacterias. Cyanobacteria contribute to the formation of these structures from the entrapment and engulfment of sediments contributing to the formation of carbonate rocks found in the geological record from the Precambrian to the Recent. In this research we identified the living cyanobacteria mats type 1 (gelatinous) and type 2 (cohesives) present in Brejo do Espinho and Araruama saline, east Fluminense, Rio de Janeirostate. The microbial mats type 1, were found in compartiment A and B of Brejo do Espinho and the Araruama saline in the tank with a depth of10 cm. The mats type 2 were only found in compartiment A and in tank with15 cmdepth. In the microbial mats of compartiments A and B predominated the spherical forms of genres Chroococcus Nageli 1948 and Aphanothece Nageli1948. Inthe tanks predominated filamentous forms of the Leptolyngbya Anagnostidis and Komárek 1988 genre. In mats type 1, the diversity indices (H') were 1.95 and 2.24 and in type 2 of 2.16 and 2.14 for the Brejo do Espinho and Araruama saline, respectively. The highest values of diversity indices found in saline tanks occurred by stable salinity conditions.

Keywords

Cyanobacteria; Microbial Mat; Brejo do Espinho; Araruama Saline

Conflicts of Interest

The authors declare no conflicts of interest.

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