The effect of temperature on growth characteristics and competitions of <Emphasis Type="Italic">Microcystis aeruginosa</Emphasis> and <Emphasis Type="Italic">Oscillatoria mougeotii</Emphasis> in a shallow,eutrophic lake simulator system |
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Authors: | Zhaosheng Chu Xiangcan Jin Norio Iwami Yuhei Inamori |
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Institution: | (1) Research Center for Lake Ecology & Environments, Chinese Research Academy of Environmental Sciences (CRAES), Beijing, 100012, China;(2) National Institute for Environmental Studies (NIES), 16-2 Onogawa, Ibaraki 305-0053, Japan |
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Abstract: | Blue-green algal blooms formed by Microcystis and Oscillatoria often occur in shallow eutrophic lakes, such as Lake Taihu (China) and Lake Kasumigaura (Japan). Growth characteristics
and competitions between Microcystis aeruginosa and Oscillatoria mougeotii were investigated using lake simulator systems (microcosms) at various temperatures. Oscillatoria was the superior competitor, which suppressed Microcystis, when temperature was <20°C, whereas the opposite phenomenon occurred at 30°C. Oscillatoria had a long exponential phase (20 day) and a low growth rate of 0.22 day−1 and 0.20 day−1 at 15°C and 20°C, respectively, whereas Microcystis had a shorter exponential phase (2–3 days) at 30°C and a higher growth rate (0.86 day−1). Interactions between the algae were stronger and more complex in the lake simulator system than flask systems. Algal growth
in the lake simulator system was susceptible to light attenuation and pH change, and algae biomasses were lower than those
in flasks. The outcome of competition between Microcystis and Oscillatoria at different temperatures agrees with field observations of algal communities in Lake Taihu, indicating that temperature
is a significant factor affecting competition between Microcystis and Oscillatoria in shallow, eutrophic lakes. |
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Keywords: | Microcystis Oscillatoria Lake simulator Competition Lake Taihu |
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