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Arriving in better shape: Benthic Microcystis as inoculum for pelagic growth

机译：达到更好的状态：底栖微囊藻作为上层生长的接种物

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摘要

Changes of the benthic Microcystis community during the time of reinvasion and its influence on the planktonic inoculum were investigated in a laboratory experiment and in a shallow lake (Quitzdorf Reservoir, Germany). Reinvasion was quantified by the diminution of benthic Microcystis abundance, and moreover, by the increase of Microcystis in the water column. Laboratory investigations revealed that the migration of Microcystis from the sediments was elevated by the increase of water temperature from 9 to 15℃. The extent of reinvasion was more pronounced in light than in dark treatments. Moreover, the reinvasion was accompanied by losses of Microcystis which disappeared from the sediments. In the laboratory experiment it was demonstrated that Microcystis got lost especially under dark conditions. This was supported by the lower photochemical vitality of dark-exposed Microcystis compared to the light-exposed ones.rnAs a consequence of the recruitment from sediments to the water column the morphospecies composition of the Microcystis community changed. Furthermore, the mcy~B genotypes of the Microcystis morphospecies were determined. From this morphotype-genotype relation it can be assumed that the composition of Microcystis genotypes at the onset of pelagic growth results from a selective recruitment of mcy~+ genotypes from the sediment to the water column.
机译：在实验室实验和浅水湖（德国奎兹多夫水库）中，研究了底栖微囊藻群落在入侵时的变化及其对浮游接种物的影响。通过减少底栖微囊藻的丰度，以及通过水柱中微囊藻的增加，可以定量确定入侵。实验室调查表明，水温从9升高到15℃，微囊藻从沉积物中的迁移增加。在光下的侵入程度比在暗处更明显。此外，再侵入伴随着微囊藻的损失，其从沉积物中消失。在实验室实验中，证明微囊藻特别是在黑暗条件下会丢失。暗暴露的微囊藻的光化学活力低于光暴露的微囊藻。这是由于从沉积物募集到水柱的结果，微囊藻群落的形态种类组成发生了变化。此外，确定了微囊藻形态物种的mcy〜B基因型。从这种形态型与基因型的关系，可以假定，在浮游鱼类生长开始时，微囊藻基因型的组成是由于从沉积物到水柱的mcy〜+基因型的选择性募集而产生的。

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  • 来源
    《Harmful Algae》 |2010年第5期|P.494-503|共10页
  • 作者

    Katja Schoene; Sabine Jaehnichen; Tilo Ihle; Frank Ludwig; Juergen Benndorf;

  • 作者单位

    Institute for Hydrobiology, Dresden University of Technology, Mommsenstr., 01062 Dresden, Germany;

    Institute for Hydrobiology, Dresden University of Technology, Mommsenstr., 01062 Dresden, Germany;

    Institute for Hydrobiology, Dresden University of Technology, Mommsenstr., 01062 Dresden, Germany Saxonian Reservoir Administration, 01796 Pirna, Germany;

    Institute for Microbiology, Dresden University of Technology, 01062 Dresden, Germany;

    rnInstitute for Hydrobiology, Dresden University of Technology, Mommsenstr., 01062 Dresden, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    cyanobacteria; light; morphospecies; mcy genotype; reinvasion; temperature;

    机译：蓝细菌光;形态种Mcy基因型再入侵温度;

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