Abstract
Community structures of ammonia-oxidizing microorganisms were investigated using PCR primers designed to specifically target the ammonia monooxygenase α-subunit (amoA) gene in the sediment of Jinshan Lake. Relationships between the abundance and diversity of ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB), and physicochemical parameters were also explored. The AOA abundance decreased sharply from west to east; however, the AOB abundance changed slightly with AOB outnumbering AOA in two of the four sediment samples (JS), JS3 and JS4. The AOA abundance was significantly correlated with the NH4–N, NO3–N, and TP. No significant correlations were observed between the AOB abundance and environmental variables. AOB had a higher diversity and richness of amoA genes than AOA. Among the 76 archaeal amoA sequences retrieved, 57.89, 38.16, and 3.95 % fell within the Nitrosopumilus, Nitrososphaera, and Nitrososphaera sister clusters, respectively. The 130 bacterial amoA gene sequences obtained in this study were grouped with known AOB sequences in the Nitrosomonas and Nitrosospira genera, which occupied 72.31 % and 27.69 % of the AOB group, respectively. Compared to the other three sample sites, the AOA and AOB community compositions at JS4 showed a large difference. This work could enhance our understanding of the roles of ammonia-oxidizing microorganisms in freshwater lake environment.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China under Grant 51109097; the Natural Science Foundation of Jiangsu Province, China under Grant BK2011520; the China Postdoctoral Science Foundation funded project under Grant 2012T50464; and the Research and Innovation Project for College Graduate of Jiangsu Province under Grant 1223000281.
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Liu, B., Li, Y., Zhang, J. et al. Abundance and Diversity of Ammonia-Oxidizing Microorganisms in the Sediments of Jinshan Lake. Curr Microbiol 69, 751–757 (2014). https://doi.org/10.1007/s00284-014-0646-0
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DOI: https://doi.org/10.1007/s00284-014-0646-0