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Spatial differences in denitrification and bacterial community structure of streams: relationships with environmental conditions

机译：溪流反硝化和细菌群落结构的空间差异：与环境条件的关系

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摘要

In streams, benthic bacterial communities are integral to multiple aspects of ecosystem function, including carbon and nitrogen cycles. Variation both in terms of bacterial community structure (based on taxo-nomic and/or functional genes) and function can reveal potential drivers of spatiotemporal patterns in stream processes. In this study, the abundance and diversity of 16S rRNA genes and abundance of nosZ genes, encoding for nitrous oxide reductase, were related to denitrification and environmental conditions. Denitrification rates varied among the three streams examined, and within a given stream there were significant longitudinal differences. Likewise, bacterial community structure based on analysis of the 16S rRNA gene also differed significantly among streams. However, variation in denitrification rate was not well correlated with environmental or biological variables measured. In addition, relatively large numbers of denitri-fiers occurred when denitrification rates were low. In conclusion, although the streams differed in environmental conditions as well as bacterial community structure, these differences did not explain much of the spatial variation in denitrification rates.
机译：在溪流中，底栖细菌群落是生态系统功能的多个方面不可或缺的，包括碳和氮循环。细菌群落结构（基于分类学和/或功能基因）和功能方面的变化都可以揭示河流过程中时空模式的潜在驱动因素。在这项研究中，编码一氧化二氮还原酶的16S rRNA基因的丰度和多样性以及nosZ基因的丰度与反硝化作用和环境条件有关。在所检查的三个流中，反硝化速率有所不同，并且在给定的流中，存在明显的纵向差异。同样，基于16S rRNA基因分析的细菌群落结构在各流中也存在显着差异。但是，反硝化率的变化与所测环境或生物变量没有很好的相关性。另外，当反硝化率低时，发生相对大量的反硝化剂。总之，尽管水流在环境条件和细菌群落结构方面有所不同，但是这些差异并不能解释反硝化率的大部分空间变化。

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  • 来源
    《Aquatic Sciences》 |2013年第2期|275-284|共10页
  • 作者

    Alyssa M. Baxter; Laura Johnson; Todd Royer; Laura G. Leff;

  • 作者单位

    Department of Biological Sciences,Kent State University, Kent, OH 44242, USA;

    School of Public and Environmental Affairs, Indiana University,1315 E. Tenth St., Bloomington, IN 47405, USA;

    School of Public and Environmental Affairs, Indiana University,1315 E. Tenth St., Bloomington, IN 47405, USA;

    Department of Biological Sciences,Kent State University, Kent, OH 44242, USA;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    streams; denitrification; bacterial communities;

    机译：溪流;反硝化细菌群落;

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