EFFECTS OF BIOTURBATION BY CYPRINUS CARPIO ON METHANE PRODUCTION FROM SEDIMENT IN AQUACULTURE PONDS
To study the effect of bioturbation by Cyprinus carpio on the formation of methane in pond sediment,we measured the methanogenic potential in the sediment,the composition of the methanogens microbial community,and the interaction between methanogen groups in laboratory simulation experiment.Results show that,compared with the control group,the methanogenic potential of the disturbed group was significantly reduced.The gene abundance of total bacteria and total archaea in the sediment increased significantly while the abundance of mcrA decreased significantly due to the bioturbation.The dominant groups of methanogens indentified were Methanobacterium,Methanothrix,Methanoregula,and Methanocella.The methanogens in the disturbed group showed high a-diversity.Bioturbation was not conducive to the interaction among methanogens in sediment,and the symbiotic network relationship were less complicated.The average degree and number of links of symbiotic network were significantly reduced,while the modularity was higher.The among-species symbiotic network was negatively correlated with competition.Pearson correlation analysis indicated that the bottom redox potential was a key environmental factor affecting the abundance of mcrA gene and the structure of methanogenic bacteria.The bioturbation effect of C.carpio may reduce the potential for methane production in the sediment by increasing the redox potential of the sediment,thereby reducing the abundance of methanogenic functional bacteria and interspecies interactions.
substrateCyprinus carpiobioturbationmethanogensbacterial community interactionmethanogenic pathway
刘洪达、陈燕、田照辉、徐绍刚、吴兆星、陈文超、王卓楠、齐遵利、潘哲
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河北农业大学海洋学院 河北秦皇岛 066003
北京市农林科学院水产科学研究所 北京 100097
河北省地质矿产勘查开发局第八地质大队 河北秦皇岛 066003
Natural Resource Ecology Laboratory,Colorado State University,Fort Collins,CO,80521,USA
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