Phytoplanktonic Structure and Chemistry of the Water in the Monjolinho Reservoir (SP, Brazil) During a Cyanobacterial Bloom Episode

Authors

  • R. B. Sotero-Santos Departamento de Ecologia e Biologia Evolutiva, Centro de Ciências Biológicas e da Saúde, Universidade Federal de São Carlos – UFSCar
  • M. J. Dellamano-Oliveira Laboratório de Ficologia, Departamento de Botânica, Centro de Ciências Biológicas e da Saúde, Universidade Federal de São Carlos – UFSCar
  • E. G. Carvalho Departamento de Ecologia e Biologia Evolutiva, Centro de Ciências Biológicas e da Saúde, Universidade Federal de São Carlos – UFSCar
  • A. Minillo Centre of Water Resources and Applied Ecology, Department of Hydraulic and Sanitation, Engineering School of São Carlos, University of São Paulo – USP,
  • O. Rocha Departamento de Ecologia e Biologia Evolutiva, Centro de Ciências Biológicas e da Saúde, Universidade Federal de São Carlos – UFSCar

Abstract

The composition of the phytoplankton and parameters of the water quality were studied in a tropical reservoir during cyanobacterial bloom episode. Samples were collected at two sites during October 2004. The phytoplankton community consisted of 69 taxa, distributed into 9 classes. Most taxa belonged to Cyanobacteria (17), Chlorophyceae (21), Bacillariophyceae (8), Conjugatophyceae (7), Dinophyceae (1), Chrysophyceae (4), Euglenophyceae (9), Cryptophyceae (1) and Xanthophyceae (1). Anabaena circinalis Rabenhorst ex Bornet et Flahault e Anabaena spiroides Klebahn were the dominant species. Statistical analyses revealed significant spatial variation (p < 0.05) between sampling points only for N compounds and chlorophyll a. Most limnological variables analyzed showed no significant temporal variation (p > 0.05). Cyanobacteria bloom was concomitant with the following environmental conditions, warm water temperatures (19 to 22 oC), periods of water column stability and high concentrations of N (724.9 μg.L-1) and P (90.9 μg.L-1) in the reservoir and NH4 as being the predominant nitrogen compounds. It is speculated that those conditions could play a role in the dominance of cyanobacteria.

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How to Cite

Sotero-Santos, R. B., Dellamano-Oliveira, M. J., Carvalho, E. G., Minillo, A., & Rocha, O. (2011). Phytoplanktonic Structure and Chemistry of the Water in the Monjolinho Reservoir (SP, Brazil) During a Cyanobacterial Bloom Episode. Ecotoxicology and Environmental Contamination, 5(1). Retrieved from https://periodicos.univali.br/index.php/eec/article/view/3046

Issue

Vol. 5 No. 1 (2010)

Section

Original Articles

License

Copyright © 2006 ECOTOX-Brasil

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