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Growth interactions between P. catenata and S. bacillaris were studied in laboratory cultures. It was found that in mixed cultures S. bacillaris inhibits the growth of P. catenata. The degree of the effect of P. catenata and S.bacillaris on each other’s growth was greatest in bialgal batch cultures and smaller in the cultures with diffusively balanced medium, while a lack of any effect was observed in culture filtrates. The effect of P. catenata on S. bacillaris appeared as weakly marked stimulation in all the cultures applied.
The greatest increases in S. bacillaris biomass were obtained in aerated and non-aerated cultures where the introduced inoculum contained 60-130 or 60-160 mg DW L-1, respectively. The application of inocula exceeding 160 mg DW L-1 brought about a rapid inhibition of biomass increase and growth rate, and also extended the lag phase. The dilution of the medium restored the ability of exponential growth in the culture. It seems that in cultures inoculated with large inocula the reduced growth of S. bacillaris was induced by autoinhibition.
The greatest increases in S. bacillaris biomass were obtained in aerated and non-aerated cultures where the introduced inoculum contained 60-130 or 60-160 mg DW L-1, respectively. The application of inocula exceeding 160 mg DW L-1 brought about a rapid inhibition of biomass increase and growth rate, and also extended the lag phase. The dilution of the medium restored the ability of exponential growth in the culture. It seems that in cultures inoculated with large inocula the reduced growth of S. bacillaris was induced by autoinhibition.
Interactions between the blue-green alga Pseudoanabaena catenata and the green alga Stichococcus bacillaris were investigated in bialgal cultures carried out in a chemostat, on a solid medium, and in continuous cultures with rotating disks. The inhibitory effect of S. bacillaris on P. catenata was most pronounced in the continuous cultures carried out with liquid media of slightly acidic pH and in the culture with rotating disks in S. bacillaris filtrate. The growth of P. catenata was also strongly inhibited in cultures on the solidified medium. The least inhibition was observed when continuous cultures were carried out in the chemostat in a slightly alkaline medium.
An investigation on the development of P. catenata, Chlorella sp., S. bacillaris, and S. acutus in mixed cultures showed that in 7 out of 11 variants of these cultures the dominating species was that whose specific growth rate was higher in monoculture. This phenomenon was not observed in the bialgal culture of Chlorella sp. and S. bacillaris and in 3 mixed cultures which, apart from other algae, included P. catenata and S. acutus. In the latter P. catenata always dominated, its growth being much faster than in the monoculture.
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