Spatial distribution and abundances of ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) in mangrove sediments.
Spatial distribution and abundances of ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) in mangrove sediments.
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红树林沉积物中氨氧化古菌（AOA）和氨氧化细菌（AOB）的空间分布和丰度
DOI：
10.1007/s00253-010-2929-0
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发表时间：
2011-02
影响因子：
5
通讯作者：
Gu, Ji-Dong
中科院分区：
文献类型：
--
作者：
Li, Meng;Cao, Huiluo;Hong, Yiguo;Gu, Ji-Dong
关键词：
我们研究了从香港地区距红树林不同距离的样带采集的不同深度沉积物样本中氨氧化古菌（AOA）和氨氧化细菌（AOB）的多样性、空间分布以及丰度。所有样本中的古菌和细菌的amoA基因（编码氨单加氧酶亚基A）都支持不同的系统发育类群，这表明红树林沉积物中存在特定生态位的AOA和AOB。红树林沉积物中AOB的丰度高于AOA，特别是在红树林树木附近，这可能表明AOB在硝化作用中具有更重要的作用。空间分布显示，AOA在红树林树木附近（0米和10米）的表层沉积物中具有更高的多样性和丰度，但在远离红树林树木（1000米）处则较低，并且AOA群落可聚类为表层和底层沉积物层组。相比之下，AOB呈现出相反的分布模式，其群落是根据采样点与红树林树木之间的距离分组的，这表明红树林树木可能对AOA和AOB群落结构有不同的影响。此外，古菌和细菌的amoA基因丰度之间以及它们与沉积物中的NH₄⁺、盐度和pH的比值之间的强相关性表明，这些环境因素对红树林沉积物中AOA和AOB的分布有强烈影响。此外，AOA的多样性和丰度与hzo基因丰度显著相关，hzo基因编码厌氧氨氧化（anammox）细菌中将肼转化为N₂的关键酶，这表明AOA和anammox细菌可能相互作用，或者它们受到相同的控制因素（如NH₄⁺）的影响。这些结果有助于更好地理解将红树林湿地用作去除营养物质的生物处理系统。
本文的网络版（doi:10.1007/s00253 - 010 - 2929 - 0）包含补充材料，授权用户可获取。
We investigated the diversity, spatial distribution, and abundances of ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) in sediment samples of different depths collected from a transect with different distances to mangrove forest in the territories of Hong Kong. Both the archaeal and bacterialamoAgenes (encoding ammonia monooxygenase subunit A) from all samples supported distinct phylogenetic groups, indicating the presences of niche-specific AOA and AOB in mangrove sediments. The higher AOB abundances than AOA in mangrove sediments, especially in the vicinity of the mangrove trees, might indicate the more important role of AOB on nitrification. The spatial distribution showed that AOA had higher diversity and abundance in the surface layer sediments near the mangrove trees (0 and 10 m) but lower away from the mangrove trees (1,000 m), and communities of AOA could be clustered into surface and bottom sediment layer groups. In contrast, AOB showed a reverse distributed pattern, and its communities were grouped by the distances between sites and mangrove trees, indicating mangrove trees might have different influences on AOA and AOB community structures. Furthermore, the strong correlations among archaeal and bacterialamoAgene abundances and their ratio with NH4+, salinity, and pH of sediments indicated that these environmental factors have strong influences on AOA and AOB distributions in mangrove sediments. In addition, AOA diversity and abundances were significantly correlated withhzogene abundances, which encodes the key enzyme for transformation of hydrazine into N2in anaerobic ammonium-oxidizing (anammox) bacteria, indicating AOA and anammox bacteria may interact with each other or they are influenced by the same controlling factors, such as NH4+. The results provide a better understanding on using mangrove wetlands as biological treatment systems for removal of nutrients.
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