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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Shifts in the Community Dynamics and Activity of Ammonia-Oxidizing Prokaryotes Along the Yangtze Estuarine Salinity Gradient
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Shifts in the Community Dynamics and Activity of Ammonia-Oxidizing Prokaryotes Along the Yangtze Estuarine Salinity Gradient

机译：沿长江河口盐度梯度的氨氧化原核生物的社区动态和活性的转变

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摘要

Ammonia oxidation, the first and rate-limiting step in nitrification, plays a critical role in the nitrogen cycle. However, the links between the dynamics of ammonia-oxidizing communities and ecosystem processes along the estuarine salinity gradient remain uncertain. In this study, we examined the diversity, abundance, and community structure of ammonia-oxidizing prokaryotes, and the potential nitrification rates along the Yangtze estuarine salinity gradient. Phylogenetic analysis showed that the predominant ammonia-oxidizing bacteria (AOB) and ammonia-oxidizing archaea (AOA) fell within the Nitrosospira and Nitrosopumilus clusters, respectively. The AOB amoA gene abundance (4.67 × 105 to 3.90 × 107 copies per gram of dry sediment) outnumbered AOA (5.14 × 10~4 to 8.88 × 10~6 copies per gram of dry sediment). The potential nitrification rates varied between 0.13 and 0.63 μg N·g~(-1)·day~(-1) and related only to AOA amoA gene abundance. Salinity had significant effects on AOA amoA gene abundance, nitrification rates, and the community structure of ammonia-oxidizing prokaryotes. Principal coordinate analysis showed that the AOB amoA gene clones derived from the middle-and high-salinity regions behaved as a cohesive group, while all the low-salinity clone libraries were grouped together. Moreover, the distribution of AOA communities showed a distinct salinity differentiation. Overall, this study improves the understanding of the dynamic shifts in ammonia-oxidizing microorganisms in the Yangtze Estuary.
机译：氨氧化，硝化的第一和速率限制步骤在氮循环中起着关键作用。然而，氨氧化社区和生态系统过程之间的联系沿河口盐度梯度仍然不确定。在这项研究中，我们研究了多样性，丰富，和社区氨氧化原核生物的结构，并沿长江河口盐度梯度的潜在硝化速率。系统发育分析表明，主要的氨氧化细菌（AOB）和氨氧化古菌（AOA）分别Nitrosospira和Nitrosopumilus簇内下降。该AOB AMOA基因丰度（4.67×105每克干燥的沉淀物3.90×107份）数量上超过AOA（5.14×10 -4至每克干沉积物的8.88×10〜6个拷贝）。潜在的硝化速率在0.13和0.63μgn·g〜（-1）·日〜（-1）之间，并且仅适用于AOA氨基基因丰富。盐度对AOA Amoa基因丰富，硝化率和氨氧化原核生物的群落结构具有显着影响。主坐标分析表明，衍生自中高盐度区域的AOB氨基氨基克隆的表现为粘性基团，而所有低盐度克隆文库一起被分组。此外，AOA社区的分布显示出不同的盐度分化。总体而言，这一研究改善长江口氨氧化菌的动态的变化的理解。

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  • 作者

    Juan Gao; Lijun Hou; Yanling Zheng; Min Liu; Guoyu Yin; Chendi Yu; Dengzhou Gao;

  • 作者单位

    State Key Laboratory of Estuarine and Coastal Research East China Normal University Shanghai China;

    State Key Laboratory of Estuarine and Coastal Research East China Normal University Shanghai China;

    State Key Laboratory of Estuarine and Coastal Research East China Normal University Shanghai China;

    College of Geographical Sciences East China Normal University Shanghai China;

    State Key Laboratory of Estuarine and Coastal Research East China Normal University Shanghai China;

    State Key Laboratory of Estuarine and Coastal Research East China Normal University Shanghai China;

    College of Geographical Sciences East China Normal University Shanghai China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生物分布与生物地理学;
  • 关键词

    Shifts in the Community; Dynamics; Activity;

    机译：在社区转变;动态;活动;

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