Structure of microphytoplankton community and environmental variables in a macrotidal estuarine complex, São Marcos Bay, Maranhão - Brazil

  • Lisana Furtado Cavalcanti Universidade Federal do Maranhão. Departamento de Oceanografia e Limnologia
  • Andrea Christina Gomes Azevedo-Cutrim Universidade Estadual do Maranhão. Departamento de Química e Biologia
  • Amanda Lorena Lima Oliveira Universidade Federal do Maranhão. Departamento de Oceanografia e Limnologia
  • Jordana Adorno Furtado Universidade Federal do Maranhão. Departamento de Oceanografia e Limnologia
  • Bethânia de Oliveira Araújo Universidade Federal do Maranhão. Departamento de Oceanografia e Limnologia
  • Ana Karoline Duarte-dos-Santos Sá Universidade Federal do Maranhão. Departamento de Oceanografia e Limnologia
  • Francinara Santos Ferreira Universidade Federal do Maranhão. Departamento de Oceanografia e Limnologia
  • Nágela Gardênia Rodrigues Santos Universidade Federal do Maranhão. Departamento de Oceanografia e Limnologia
  • Francisco José Silva Dias Universidade Federal do Maranhão. Departamento de Oceanografia e Limnologia
  • Marco Valério Jansen Cutrim Universidade Federal do Maranhão. Departamento de Oceanografia e Limnologia
Keywords: Macrotidal estuaries, Phytoplankton abundance, Chlorophyll a, Nutrients

Abstract

São Marcos Bay is an estuarine complex with semidiurnal tides that can reach more than 7 m during equinoctial spring tides. It is situated in the second largest Brazilian coastline and is subjected to continuous human activities holding an important port complex of Latin America. In order to contribute to the knowledge about the structure of the phytoplankton in a macrotidal systems, this study aims to evaluate the phytoplankton community and its relationship with environmental conditions in the São Marcos Bay. Five surveys in 2010 and 2011 were carried out on four sampling points during the rainy and dry seasons. Samples were taken during the flood and ebb phases at neap tides. Hydrological parameters were correlated with biological data (phytoplankton composition, abundance and biomass) using statistical analysis. The phytoplankton biomass (chlorophyll a) characterized the bay as quite productive (10.43±7.62 mg m-3) with the nanophytoplankton as the dominant fraction. Seasonal variation was observed in phytoplankton abundance with higher values (34,262±18,422 cells L-1) in the rainy season. Diatoms were the most important phytoplankton group, pointing out Nitzschia sp., Diploneis weissflogii and Synedra sp. as the dominant species. This study revealed that the composition of phytoplankton community was mainly influenced by the local dynamics, governed by macrotides, and precipitation regime that mostly contributed to the seasonal fluctuations of the environmental conditions, such as salinity, dissolved oxygen, and nutrients.

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Published
2018-12-21
How to Cite
Cavalcanti, L., Azevedo-Cutrim, A. C., Oliveira, A., Furtado, J., Araújo, B., Sá, A. K., Ferreira, F., Santos, N., Dias, F. J., & Cutrim, M. V. (2018). Structure of microphytoplankton community and environmental variables in a macrotidal estuarine complex, São Marcos Bay, Maranhão - Brazil. Brazilian Journal of Oceanography, 66(3), 283-300. https://doi.org/10.1590/s1679-87592018021906603
Section
Original Article