Abstract
This paper describes the growth in culture of the cyanobacterium Synechocystis aquatilis f. salina. This organism was the dominant species over a 3 year period from October 1990 to August 1993 in the Barra lagoon (Marica-RJ, Brazil). The cyanobacterial biomass was negatively correlated with nitrate plus nitrite concentrations and DIN/PO4, PON/POP, NO3/TP, and TN/TP ratios. Synechocystis aquatilis f. salina represented on average 57% of cyanobacterial density during the entire period studied. Based on these data, the species was cultivated under laboratory conditions in ASM-1 medium and ASM-1 10 times diluted for all nutrients (ASM-1/10) with N/P ratios of 3:1, 10:1, and 30:1. Growth rates, chlorophyll-a, protein, and carbohydrate intracellular concentrations, carbohydrate release, photosynthetic and respiratory activity, and microcystin production were investigated. It was concluded that the species is well adapted to a condition of nitrogen limitation. High chlorophyll-a and protein concentrations as well as the highest photosynthetic rate were observed by cultures grown in ASM-1 medium with low N/P ratio (3:1). This study aims to evaluate the role of the N/P ratio in controlling the composition of the phytoplanktonic community of the Barra lagoon, according to the physiological response of Synechocystis aquatilis f. salina to different ratios. ©1999 John Wiley & Sons, Inc. Environ Toxicol 14: 37–44, 1999
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