Effect of dilution rate on competitive interactions between the cyanobacterium Microcystis novacekii and the green alga Scenedesmus quadricauda in mixed chemostat cultures |
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Authors: | Takeya Kaoru; Kuwata Akira; Yoshida Makoto; Miyazaki Tatsuo |
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Institution: | Marine Biosystems Research Centre, Chiba University, Amatsu-Kominato, Awa-Gun, Chiba-Ken 299-5502,
1 Tohoku National Fisheries Research Institute, 3-27-5 Shinhama-Cho, Shiogama, Miyagi-Ken 985-0001 and
2 Department of Mechanical Engineering, Tokyo Metropolitan University, 1-1 Minamioosawa, Hachoji, Tokyo 192-0397, Japan |
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Abstract: | We examined the competition between the cyanobacterium Microcystisnovacekii (Kom.) Comp. and the green alga Scenedesmus quadricauda(Turpin) Brébisson using unialgal and mixed chemostatcultures with various supply rates of culture medium where limited algal growth. In unialgal cultures, bothspecies grew at all of the dilution rates examined (0.1, 0.3and 0.8 day-1): steady-state cell densities were 1 x 104 to8 x 104 cells mL-1 for M. novacekii and 0.5 x 105 to 2.1 x 105cells mL-1 for S. quadricauda. Microcystis novacekii was dominantin mixed cultures at a dilution rate of 0.1 day-1, where thesteady-state cell density was 1 x 104 to 7 x 104 cells mL-1for M. novacekii and 1 x 102 to 5 x 102 cells mL-1 for S. quadricauda.Scenedesmus quadricauda was dominant in mixed cultures at thehigher dilution rates (0.3 and 0.8 day-1), where the final celldensity was 0.5 x 102 to 6.4 x 102 cells mL-1 for M. novacekiiand 0.2 x 105 to 7 x 105 cells mL-1 for S. quadricauda. Thisresult indicates that the dilution rate affects the competitiveinteraction. We conclude that it is necessary to consider waterexchange in the study of mechanisms of cyanobacterial blooms. |
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