Phytoplankton dynamics in a highly eutrophic estuary in tropical Brazil

  • Marilene Felipe Santiago Universidade Federal de Pernambuco; Departamento de Oceanografia
  • Maria da Glória Gonçalves da Silva-Cunha Universidade Federal de Pernambuco; Departamento de Oceanografia
  • Sigrid Neumann-Leitão Universidade Federal de Pernambuco; Departamento de Oceanografia
  • Kátia Muniz Pereira da Costa Universidade Federal de Pernambuco; Departamento de Oceanografia
  • Gislayne Cristina Borges Palmeira Universidade Federal de Pernambuco; Departamento de Oceanografia
  • Fernando de Figueiredo Porto Neto Universidade Federal Rural de Pernambuco; Departamento de Zootecnia
  • Fabiana Santana Nunes Universidade Federal de Pernambuco; Departamento de Oceanografia
Keywords: Phytoplankton, Port, estuary, Diurnal variation, Tropical

Abstract

The port of Recife in northeastern Brazil is an important ecological and social area but little is known about its environmental quality. Observations, sampling and measurements of phytoplankton were performed during spring and neap tides in the dry (January-February, 2005) and rainy (June, 2005) seasons to assess the environmental quality of the port of Recife. The area had chlorophyll-a concentrations ranging from 3.30 to 54.40 mg m-3, the highest values occurring at low tide during the dry season. A total of 129 species were identified: 53 of them in the dry season and 97 in the rainy season. Diatoms were the most diverse group and comprised 75.47% of the phytoplankton collected in the dry season and 60.82% of those collected in the rainy season. The dry season was characterized by Coscinodiscus sp. and Helicotheca tamesis; the rainy season by Oscillatoria sp. and Coscinodiscus centralis. Species diversity indices varied from 1.06 to 3.74 bits cel-1. Low indices were related to the dominance of Helicotheca tamesis, Coscinodiscus centralis, Coscinodiscus sp. and Aulacoseira granulata. Seasonal forcing, rather than the estuarine flux, determined the phytoplankton community structure. The area is exposed to seasonally varying negative impacts due to metropolitan degradation and the high level of eutrophication.

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Published
2010-09-01
How to Cite
Santiago, M., Silva-Cunha, M., Neumann-Leitão, S., Costa, K., Palmeira, G., Porto Neto, F., & Nunes, F. (2010). Phytoplankton dynamics in a highly eutrophic estuary in tropical Brazil . Brazilian Journal of Oceanography, 58(3), 189-205. https://doi.org/10.1590/S1679-87592010000300002
Section
naodefinida