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Hydrobiologia

, Volume 627, Issue 1, pp 195–209 | Cite as

Morphological and molecular characterization of cyanobacteria from a Brazilian facultative wastewater stabilization pond and evaluation of microcystin production

  • Ana Luiza Fonseca Fortes Furtado
  • Maria do Carmo Calijuri
  • Adriana Sturion Lorenzi
  • Ricardo Yukio Honda
  • Diego Bonaldo Genuário
  • Marli Fátima FioreEmail author
Primary research paper

Abstract

The cyanobacterial population in the Cajati waste stabilization pond system (WSP) from São Paulo State, Brazil was assessed by cell isolation and direct microscope counting techniques. Ten strains, belonging to five genera (Synechococcus, Merismopedia, Leptolyngbya, Limnothrix, and Nostoc), were isolated and identified by morphological and molecular analyses. Morphological identification of the isolated strains was congruent with their phylogenetic analyses based on 16S rDNA gene sequences. Six cyanobacterial genera (Synechocystis, Aphanocapsa, Merismopedia, Lyngbya, Phormidium, and Pseudanabaena) were identified by direct microscope inspection. Both techniques were complementary, since, of the six genera identified by direct microscopic inspection, only Merismopedia was isolated, and the four other isolated genera were not detected by direct inspection. Direct microscope counting of preserved cells showed that cyanobacteria were the dominant members (>90%) of the phytoplankton community during both periods evaluated (summer and autumn). ELISA tests specific for hepatotoxic microcystins gave positive results for six strains (Synechococcus CENA108, Merismopedia CENA106, Leptolyngbya CENA103, Leptolyngbya CENA112, Limnothrix CENA109, and Limnothrix CENA110), and for wastewater samples collected from raw influent (3.70 μg microcystins/l) and treated effluent (3.74 μg microcystins/l) in summer. Our findings indicate that toxic cyanobacteria in WSP systems are of concern, since the treated effluent containing cyanotoxins will be discharged into rivers, irrigation channels, estuaries, or reservoirs, and can affect human and animal health.

Keywords

Algae 16S rDNA Sequencing Phylogenetic analysis Hepatotoxins Wastewater treatment 

Notes

Acknowledgments

We thank the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) for financial support (2002/13449-1 to M.C.C. and 2005/56303-5 to M.F.F.). A.L.F.F. Furtado and R.Y. Honda received graduate scholarships from CAPES (Ministry of Education Agency) and A.S. Lorenzi received a graduate scholarship from CNPq (National Council for Scientific and Technological Development—140327/2004-5). D.B. Genuário was supported by FAPESP graduate scholarship (2007/06360-8). M.F. Fiore would also like to thank CNPq for a research fellowship (311094/2006-6). We thank Dr. A.C.P. Miwa for the algae and cyanobacteria counting and Dr. L.C.R. Pessenda (Carbon 14 Laboratory, CENA/USP) for permission to use the Axioskop 40 microscope.

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Ana Luiza Fonseca Fortes Furtado
    • 1
    • 2
  • Maria do Carmo Calijuri
    • 1
  • Adriana Sturion Lorenzi
    • 2
  • Ricardo Yukio Honda
    • 2
  • Diego Bonaldo Genuário
    • 2
  • Marli Fátima Fiore
    • 2
    Email author
  1. 1.Departamento de Hidráulica e Saneamento, Escola de Engenharia de São CarlosUniversidade de São PauloSão CarlosBrazil
  2. 2.Centro de Energia Nuclear na AgriculturaUniversidade de São PauloPiracicabaBrazil

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