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首页> 外文期刊>Marine ecology progress series >Effects of stratification depth and dissolved organic matter on brackish bacterioplankton communities
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Effects of stratification depth and dissolved organic matter on brackish bacterioplankton communities

机译：分层深度和溶解有机物对微咸细菌浮游生物群落的影响

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摘要

Bacterioplankton growth is often directly or indirectly controlled by external energy subsidies via organic matter inputs or solar radiation. We carried out a mesocosm experiment to assess how bacterioplankton communities responded to elevated levels of dissolved organic matter (DOM) and experimentally controlled stratification depth. The month-long experiment consisted of 25001 mesocosms subjected to 4 experimental manipulations in triplicate: the stratification depth was set to either 1.5 or 3.5 m, with or without experimental addition of ambient levels of chromophoric DOM. DOM addition had a significant effect on bacterial community composition as assessed by terminal restriction fragment length polymorphism of amplified 16S rRNA genes. In contrast, there were no effects of the DOM amendment on bacterial biomass or production. Mixing depth and the coupled effective light climate in the photic zone also had a significant effect on bacterial community composition. Furthermore, shallow mixing depth was associated with enhanced primary production, whereas DOM addition had a negative effect on phyto-plankton biomass and productivity. Our results suggest that bacterial community composition is coupled to primary production under the studied coastal nutrient regime, and point to a key role of DOM quality in controlling bacterioplankton communities.
机译：浮游细菌的生长通常直接或间接地通过有机物输入或太阳辐射的外部能量补贴来控制。我们进行了中观宇宙实验，以评估浮游生物群落对溶解有机物（DOM）含量升高和实验控制的分层深度的反应。为期一个月的实验由25001个中观组成，一式三份，共进行了4次实验操作：分层深度设置为1.5或3.5 m，有或没有添加环境水平的发色DOM。通过扩增的16S rRNA基因的末端限制性片段长度多态性评估，添加DOM对细菌群落组成具有重要影响。相反，DOM修正对细菌生物量或产量没有影响。光合区的混合深度和耦合的有效光照气候对细菌群落组成也有重要影响。此外，浅层混合深度与初级产量的增加有关，而DOM的添加对浮游植物的生物量和生产力有负面影响。我们的结果表明，在研究的沿海养分制度下，细菌群落组成与初级生产相关，并指出DOM质量在控制浮游生物群落中的关键作用。

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  • 来源
    《Marine ecology progress series》 |2012年第7期|p.37-48|共12页
  • 作者

    Lorena M. Grubisic; Andreas Brutemark; Gesa A. Weyhenmeyer; Johan Wikner; Ulf Bamstedt; Stefan Bertilsson;

  • 作者单位

    Department of Ecology and Genetics, Limnology, Uppsala University, 75236 Uppsala, Sweden;

    Marine Science Centre, University of Kalmar, 39182 Kalmar, Sweden, ARONIA Coastal Zone Research Team, Novia University of Applied Sciences & Abo Akademi University,10600 Ekenaes, Finland;

    Department of Ecology and Genetics, Limnology, Uppsala University, 75236 Uppsala, Sweden, Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences (SLU), 75007 Uppsala, Sweden;

    Department of Ecology and Environmental Science, Umea Marine Sciences Centre, Umea University, 90187 Umea, Sweden;

    Department of Ecology and Environmental Science, Umea Marine Sciences Centre, Umea University, 90187 Umea, Sweden;

    Department of Ecology and Genetics, Limnology, Uppsala University, 75236 Uppsala, Sweden;

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  • 正文语种 eng
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  • 关键词

    bacterial community composition; dissolved organic matter; stratification depth; mesocosm; brackish; phytoplankton;

    机译：细菌群落组成;溶解的有机物分层深度中观淡淡的浮游植物;

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