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首页> 外文期刊>Limnology >Grazing on Microcystis (Cyanophyceae) by testate amoebae with special reference to cyanobacterial abundance and physiological state
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Grazing on Microcystis (Cyanophyceae) by testate amoebae with special reference to cyanobacterial abundance and physiological state

机译：睾丸变形虫放牧微囊藻（蓝藻科），并特别提及蓝细菌的丰度和生理状态

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摘要

We examined the growth of testate amoebae preying on Microcystis whose physiological states were different in laboratory experiments and a hypertrophic pond. We prepared three experimental systems using water samples dominated by Microcystis aeruginosa: light incubation (control), dark incubation (dark), and light incubation with addition of nitrogen and phosphorus (+NP). In all the systems, the colony density of M. aeruginosa decreased slightly during incubation. Physiological activity of phytoplankton as determined by chlorophyll fluorescence was high and almost constant in the control and +NP systems, whereas it decreased in the dark system. Cell densities of testate amoebae increased in the control and +NP systems, whereas in the dark system they remained low. Thus, growth of the amoebae was low in the systems where physiological activity of Microcystis was low. In a hypertrophic pond, cell density of testate amoebae increased and remained high when M. aeruginosa predominated. Cell density of testate amoebae increased remarkably, simultaneously with the increases in M. aeruginosa colony density and phytoplankton physiological activity. We also found a significant correlation between densities of M. aeruginosa colonies and testate amoebae. We suggested that the physiological activity of Microcystis is one important factor affecting the growth of testate amoebae grazing on Microcystis.
机译：我们检查了摄食微囊藻的睾丸变形虫的生长情况，微囊藻的生理状态在实验室实验和肥大池塘中有所不同。我们使用铜绿微囊藻为主导的水样品制备了三个实验系统：光照培养（对照），黑暗培养（黑暗）和添加氮和磷（+ NP）的光照培养。在所有系统中，铜绿假单胞菌的菌落密度在孵育过程中均略有下降。通过叶绿素荧光确定的浮游植物的生理活性很高，在对照和+ NP系统中几乎恒定，而在黑暗系统中则降低。在对照和+ NP系统中，睾丸变形虫的细胞密度增加，而在黑暗系统中，它们保持较低水平。因此，在微囊藻的生理活性低的系统中，变形虫的生长低。在肥厚的池塘中，当铜绿假单胞菌占优势时，睾丸变形虫的细胞密度增加并保持较高水平。睾丸变形虫细胞密度显着增加，同时铜绿假单胞菌菌落密度和浮游植物生理活性增加。我们还发现铜绿假单胞菌菌落和睾丸变形虫的密度之间存在显着相关性。我们认为微囊藻的生理活性是影响放牧微囊藻的睾丸变形虫生长的重要因素之一。

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  • 来源
    《Limnology》 |2011年第3期|p.205-211|共7页
  • 作者

    Seiko Mizuta; Hiroyuki Imai; Kwang-Hyeon Chang; Hideyuki Doi; Yuichiro Nishibe; Shin-ichi Nakano;

  • 作者单位

    LAFWEDY, Ehime University, 3-5-7 Tarumi, Matsuyama, Ehime, 790-8566, Japan;

    LAFWEDY, Ehime University, 3-5-7 Tarumi, Matsuyama, Ehime, 790-8566, Japan;

    LAFWEDY, Ehime University, 3-5-7 Tarumi, Matsuyama, Ehime, 790-8566, Japan;

    LAFWEDY, Ehime University, 3-5-7 Tarumi, Matsuyama, Ehime, 790-8566, Japan;

    LAFWEDY, Ehime University, 3-5-7 Tarumi, Matsuyama, Ehime, 790-8566, Japan;

    LAFWEDY, Ehime University, 3-5-7 Tarumi, Matsuyama, Ehime, 790-8566, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Microcystis; Testate amoebae; Grazing; Physiological state;

    机译：微囊藻睾丸变形虫放牧生理状态;

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