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Dynamics and environmental importance of anaerobic ammonium oxidation (anammox) bacteria in urban river networks.
Environmental Pollution ( IF 7.6 ) Pub Date : 2019-08-02 , DOI: 10.1016/j.envpol.2019.112998 Yanling Zheng 1 , Lijun Hou 2 , Min Liu 3 , Guoyu Yin 3
Environmental Pollution ( IF 7.6 ) Pub Date : 2019-08-02 , DOI: 10.1016/j.envpol.2019.112998 Yanling Zheng 1 , Lijun Hou 2 , Min Liu 3 , Guoyu Yin 3
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Anaerobic ammonium oxidation (anammox) is recognized as an important bioprocess for nitrogen removal, yet little is known about the associated microbial communities in urban river networks which are intensively disturbed by human activity. In the present study, we investigated the community composition and abundance of anammox bacteria in the urban river network of Shanghai, and explored their potential correlations with nitrogen removal activities and the environmental parameters. High biodiversity of anammox bacteria was detected in the sediment of urban river networks, including Candidatus Brocadia, Scalindua, Jettenia, and Kuenenia. Anammox bacterial abundance ranged from 3.7 × 106 to 3.9 × 107 copies g-1 dry sediment based on 16S rRNA gene, which was strongly correlated to the metabolic activity of anammox bacteria (P < 0.01). A strong linkage between anammox bacteria and denitrifiers was detected (P < 0.05), implying a potential metabolic interdependence between these two nitrogen-removing microbes was existed in urban river networks. Sediment ammonium (NH4+) made a significant contribution to the anammox bacterial community-environment relationship, while anammox bacterial abundance related significantly with sediment total organic carbon (TOC) and silt contents (P < 0.05). However, no statistically significant correlation was observed between cell-specific anammox rate and the measured environmental factors (P > 0.05). In general, the community composition and abundance of anammox bacteria in different hierarchies of the river network was homogeneous, without significant spatial variations (P > 0.05). These results provided an opportunity to further understand the microbial mechanism of nitrogen removal bioprocesses in urban river networks.
中文翻译：
城市河网中厌氧铵氧化（anammox）细菌的动力学和环境重要性。
厌氧铵氧化（厌氧氨）被认为是去除氮的重要生物过程，但对于城市河网中受人类活动严重干扰的相关微生物群落知之甚少。在本研究中，我们调查了上海城市河网中厌氧氨氧化菌的群落组成和丰富度，并探讨了它们与脱氮活性和环境参数的潜在关系。在城市河网（包括假丝酵母，斯卡林杜瓦，杰特尼亚和昆尼尼亚）的沉积物中检测到了高生物多样性的厌氧菌细菌。基于16S rRNA基因，厌氧细菌的丰度范围为3.7×106至3.9×107拷贝g-1干沉积物，这与厌氧细菌的代谢活性密切相关（P <0.01）。检测到厌氧菌和反硝化剂之间有很强的联系（P <0.05），这表明城市河网中存在这两种除氮微生物之间潜在的代谢依赖性。沉积物铵（NH4 +）对厌氧菌细菌群落与环境的关系起着重要作用，而厌氧菌细菌的丰度与沉积物总有机碳（TOC）和淤泥含量显着相关（P <0.05）。然而，在细胞特异性厌氧菌率和所测环境因子之间没有观察到统计学上的显着相关性（P> 0.05）。一般而言，河网不同层级中的厌氧菌细菌群落组成和丰富度是均匀的，没有明显的空间变化（P> 0.05）。
更新日期：2019-08-02
中文翻译：
城市河网中厌氧铵氧化（anammox）细菌的动力学和环境重要性。
厌氧铵氧化（厌氧氨）被认为是去除氮的重要生物过程，但对于城市河网中受人类活动严重干扰的相关微生物群落知之甚少。在本研究中，我们调查了上海城市河网中厌氧氨氧化菌的群落组成和丰富度，并探讨了它们与脱氮活性和环境参数的潜在关系。在城市河网（包括假丝酵母，斯卡林杜瓦，杰特尼亚和昆尼尼亚）的沉积物中检测到了高生物多样性的厌氧菌细菌。基于16S rRNA基因，厌氧细菌的丰度范围为3.7×106至3.9×107拷贝g-1干沉积物，这与厌氧细菌的代谢活性密切相关（P <0.01）。检测到厌氧菌和反硝化剂之间有很强的联系（P <0.05），这表明城市河网中存在这两种除氮微生物之间潜在的代谢依赖性。沉积物铵（NH4 +）对厌氧菌细菌群落与环境的关系起着重要作用，而厌氧菌细菌的丰度与沉积物总有机碳（TOC）和淤泥含量显着相关（P <0.05）。然而，在细胞特异性厌氧菌率和所测环境因子之间没有观察到统计学上的显着相关性（P> 0.05）。一般而言，河网不同层级中的厌氧菌细菌群落组成和丰富度是均匀的，没有明显的空间变化（P> 0.05）。
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