Primary productivity of coccoid cyanobacteria isolated from a coastal lagoon environment south of the Gulf of California.
DOI:
https://doi.org/10.37543/oceanides.v33i2.237Keywords:
prokaryotes culture, primary productivity, cyanobacteriaAbstract
The objective of this study was to determine the primary productivity of cyanobacteria grown under different nitrogen sources. 3 treatments were considered: 1) without a nitrogen source, 2) with nitrate (NO3), and 3) with ammonium (NH4). Incubations were carried out under controlled conditions. Cell densities were significantly higher in nitrate treatment. The maximums of biovolume (19.9 µm-3) and of carbon content (5.4 pg C cel-1) were observed in the stationary phase of the treatment with ammonia. The highest concentration of chlorophyll a in the exponential phase was recorded in the treatment without nitrogen (1,038 mg m-3), while the maximum in the stationary phase in the treatment with nitrates (0.65 mg m-3). The highest primary production was recorded in the exponential phase (23.9 mg C m-3 h-1), associated with treatment without a nitrogen source incubated at 150 µ E m-2 s-1; in the stationary phase the maximum (11.6 mg C m-3 h-1) was registered in the treatment enriched with nitrates at 75 µ E m-2 s-1.
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Copyright (c) 2018 Gerardo Verdugo -Díaz, Aída Martínez -López, Bárbara González -Acosta
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