Phytoplankton community structure in one sector of Guanabara Bay (RJ, Brazil) during 2011 and 2012

Authors

  • Katia Regina Vieira de Rezende Universidade do Estado do Rio de Janeiro; Unidade de Desenvolvimento Tecnológico; GESAR
  • Melissa Medeiros Ferreira Hatherly Universidade do Estado do Rio de Janeiro; Unidade de Desenvolvimento Tecnológico; GESAR
  • Cristiane Marques Monteiro Pimenta Universidade do Estado do Rio de Janeiro; Unidade de Desenvolvimento Tecnológico; GESAR
  • Janaina Eduardo Universidade do Estado do Rio de Janeiro; Unidade de Desenvolvimento Tecnológico; GESAR
  • Simone de Castro Vianna Universidade do Estado do Rio de Janeiro; Unidade de Desenvolvimento Tecnológico; GESAR
  • Norberto Mangiavacchi Universidade do Estado do Rio de Janeiro; Unidade de Desenvolvimento Tecnológico; GESAR

DOI:

https://doi.org/10.1590/S1679-87592015086506303

Abstract

This study analyzed the temporal variability of phytoplankton assemblages in the surface waters of Guanabara Bay (RJ, Brazil), at six stations in front of Icaraí Inlet from April/2011 to April/2012. Our results highlight the great contribution of diatoms, dinoflagellates and cyanobacteria, represented by 111 taxa typical of estuarine and coastal areas. The coexistence of benthic and planktonic species suggests considerable hydrodinamism in these waters. All variables were homogeneous (p >; 0.05) between the stations, but differed between sampling periods. On average, phytoplankton abundance (107 cells.L-1) was higher than that of other estuaries and its temporal behavior was closely correlated (p < 0.01) with diatoms and cyanobacteria. The richness distribution pattern (7 to 27 taxa) was closely correlated (p < 0.01) with dinoflagellates and diatoms. Ninety per cent of all samples presented a low diversity index (< 2.0 bits.cell-1), which indicated the unstable balance of the system, typical of environments subjected to eutrophication. The population structure analysis revealed that 10% of all taxa were resident, 12% visitors and 78% accidental, suggesting the influence of continental and oceanic water influxes. Between the "typical" taxa, the most common were the cyanobacteria of the order Oscillatoriales, the diatoms Ceratoneis closterium (=Cylindrotheca closterium) and Leptocylindrus minimus and the dinoflagellate Prorocentrum triestinum.

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Published

2015-09-01

How to Cite

Rezende, K. R. V. de, Hatherly, M. M. F., Pimenta, C. M. M., Eduardo, J., Vianna, S. de C., & Mangiavacchi, N. (2015). Phytoplankton community structure in one sector of Guanabara Bay (RJ, Brazil) during 2011 and 2012 . Brazilian Journal of Oceanography, 63(3), 239-254. https://doi.org/10.1590/S1679-87592015086506303

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Original Article