Modern Diatom Distributions in Guanabara Bay Sediment and Oceanic Areas, Rio de Janeiro (Brazil)

Authors

  • Lazaro L.M. Laut Universidade Federal do Estado do Rio de Janeiro; Departamento de Ciências Naturais; Laboratório de Micropaleontologia - LabMicro
  • Vanessa M. Laut Universidade Federal do Estado do Rio de Janeiro; Faculdade de Geologia; Laboratório de Palinofácies e Fácies Orgânicas
  • Frederico S. Silva Universidade Federal do Estado do Rio de Janeiro; Faculdade de Geologia; Laboratório de Palinofácies e Fácies Orgânicas
  • Alberto G. Figueiredo Jr. Universidade Federal do Estado do Rio de Janeiro; Departamento de Ciências Naturais; Laboratório de Micropaleontologia - LabMicro

DOI:

https://doi.org/10.11137/2011_1_64-87

Abstract

One hundred and fifty three superficial sediments were collected in Guanabara Bay to physical-chemistry and diatom analyses in the ambit to Monitoring Project (CENPES/PETROBRAS). A total of 146 taxa of diatoms were identified where the most frequent taxa in Guanabara Bay were Amphora spp., Coscinodiscus spp. and Navicula yarrensis var. yarrensis. These species are potentially harmful that might harm fisheries and mariculture during blooms. The values of ecological indexes like richness and diversity followed the estuarine gradient were the higher values were found in the mouth and de low in the inner part. The multivariate analyzes permitted recognize seven diatom assemblages in the bay. The DCA analyze shows the most influence in the distribution of assemblages were the depth and pH. The diatom assemblages analyze proved to be an efficient tool in the environmental diagnosis of Guanabara Bay.

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Published

2011-01-01

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