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Simultaneous Cultivation of Spirulina platensis and the Toxigenic Cyanobacteria Microcystis aeruginosa

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Simultaneous Cultivation of Spirulina platensis and the Toxigenic Cyanobacteria Microcystis aeruginosa

Jorge Alberto Vieira Costa

*

, Michele Greque de Morais, Francieli Dalcanton, Carolina da Cruz Reichert, and Andrei Jose´ Durante

Laborato´rio de Engenharia Bioquı´mica, Departamento de Quı´mica, Fundac¸a˜o Universidade Federal do Rio Grande, Caixa Postal 474, CEP 96201-900, Rio Grande, RS, Brazil.

Fax: +55-53-32 33 87 45. E-mail: dqmjorge@furg.br

* Author for correspondence and reprint requests Z. Naturforsch.61 c, 105Ð110 (2006); received July 6, 2005

Mangueira Lagoon, located in the extreme south of Brazil, has water with physicochemical characteristics such as alkaline pH and carbonate levels propitious for the growth of the cyanobacteriumSpirulina platensis.Previously published studies have shown that Mangueira Lagoon water supplemented with small quantities of carbon and nitrogen is suitable forS.

platensiscultivation and can significantly reduce production costs. We studied mixed cultures ofSpirulina platensisand the toxic cyanobacteriumMicrocystis aeruginosausing a 23factorial design in which the three factors were the initial biomass concentration ofS. platensisand M. aeruginosaand the type of culture medium (100% Zarrouk’s medium or 80% Mangueira Lagoon water plus 20% Zarrouk’s medium). The highest S. platensis maximum specific growth rate (µmax) occurred in the culture with the highestM. aeruginosabiomass concentra- tion and when undiluted culture medium was used (µmax= 0.283 dÐ1). The highestM. aerugi- nosaspecific death rate (k) was obtained in the presence ofS. platensis(k= 0.555 dÐ1) and was independent of the initial M. aeruginosa biomass concentration and culture medium, demonstrating thatS. platensiscultures are not susceptible to contamination byM. aerugi- nosa.The culture medium had no significant influence (p> 0.05) onS. platensisµmaxvalues, indicating that production costs could be reduced by using a medium consisting of 80%

Mangueira Lagoon water plus 20% Zarrouk’s medium.

Key words:Cyanobacteria,Microcystis aeruginosa,Spirulina platensis

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