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Effects of rice-crayfish co-culture on ammonia-oxidizing microbial abundance and community structure

文献类型： 外文期刊

作者： Yang, Zhen 1 ; Yao, Yanhong 2 ; Sun, Meng 1 ; Li, Gu 2 ; Zhu, Jianqiang 1 ;

作者机构： 1.Yangtze Univ, Jinzhou 434025, Hubei, Peoples R China

2.Chinese Acad Fishery Sci, Yangtze River Fisheries Res Inst, Wuhan 430223, Peoples R China

关键词： Rice-crayfish co-culture; Crayfish ponds; Ammonia-oxidizing bacteria; Ammonia-oxidizing archaea

期刊名称：AQUATIC ECOLOGY （ 影响因子：2.218； 五年影响因子：2.844 ）

ISSN： 1386-2588

年卷期：

页码：

收录情况： SCI

摘要： Ammonia oxidation microorganism (AOM) is a key aspect of nutrient recycling in aquaculture sediments. Recently, rice-fish co-culture (symbiosis) has been paid more and more attention to the restoration of water and sediment quality in intensive aquaculture. Nevertheless, there are few studies on the effect of rice-fish co-culture on AOM in the sediments. Here, a field experiment was used to determine differences in abundance, community structure of ammonia-oxidizing bacteria (AOB) along with ammonia-oxidizing archaea (AOA) in surface sediments (0-10 cm) in the paddy field (with ridge of 80 cm high, similar to shallow pond) for co-culture of japonica rice and crayfish (Procambarus clarkii) (JR-C), co-culture of indica rice and crayfish (IR-C), and crayfish monoculture (CM). The results showed that AOA were higher abundance, and diversity than AOB in the three modes of crayfish farming; AOA and AOB communities were dominated by Nitrososphaera and Nitrosospira clusters, respectively, with an average relative abundance of 97.86% and 93.77%; among the three modes, IR-C remarkably lowered alpha-diversity of AOA and AOB. Compared to CM, relative abundance of the Nitrosospira cluster in IR-C and JR-C was significantly increased, and the abundance of amoA genes of AOA in JR-C was remarkably higher (P < 0.05). Redundancy analysis (RDA) and spearman's correlation analysis showed that AOB community structure and abundances of AOA were significantly correlated with sediment pH, which indicated that sediment pH dominantly controlled the AOM.

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