Geomicrobiologic study of coloform mat in Pernambuco lagoon, Lagos Region, Rio de Janeiro State

Authors

  • Anderson Andrade Cavalcanti Iespa
  • Loreine Hermida da Silva e Silva
  • Cynthia Moreira Damazio-Iespa

Abstract

The Pernambuco Lagoon is located in the northeastern part of Rio de Janeiro State, Brazil (22°55’31”- 22°56’02” S and 42°20’21”- 42°17’26” W). It was formed during the last Holocene transgression and their calcareous and organic deposits results from the semi arid climate that characterizes the area. The aim of this study is to characterize the cyanobacteria composition of the organosedimentary deposits of benthic microbial communities deposited in this lagoon due to the climate conditions. The composition of the coloform mat is dominated by the families Chroococcaceae Nägeli, 1849, Phormidiaceae Anagnostidis and Komárek, 1988 and Synechococcaceae Komárek and Anagnostidis, 1995, representing 26,3% of the cyanobacteria, with Microcoleus chthonoplastes (Thuret) Gomont, 1892 being the most abundant specie. Others families represented are Oscillatoriaceae Gomont, 1892, Pseudanabaenaceae Anagnostidis and Komárek, 1988, Schizothricaceae Elenkin, 1934, Entophysalidaceae Geitler, 1925, and Merismopediaceae Elenkin, 1933. Skeletal remains of molluscs, foraminifers and ostracods found in association with the deposits must be the source of the calcium carbonate that structured the mats.

Key words: cyanobacteria, microbialites, Pernambuco Lagoon, Rio de Janeiro State, Brazil.

Downloads

Published

2021-06-08

Issue

Vol. 2 No. 2 (2006): jul/dec

Section

Artigos

License

I grant the journal Gæa – Journal of Geoscience the first publication of my article, licensed under Creative Commons Attribution license (which allows sharing of work, recognition of authorship and initial publication in this journal).

I confirm that my article is not being submitted to another publication and has not been published in its entirely on another journal. I take full responsibility for its originality and I will also claim responsibility for charges from claims by third parties concerning the authorship of the article.

I also agree that the manuscript will be submitted according to the journal’s publication rules described above.