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Abundance and community composition of ammonia-oxidizing archaea and bacteria in two different zones of Lake Taihu

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Abstract:

The abundance and community composition of ammonia-oxidizing archaea and ammonia-oxidizing bacteria in the surface sediments of 2 different zones (Meiliang Bay and Eastern Lake Taihu) of Lake Taihu were investigated using real-time quantitative polymerase chain reaction and clone libraries. The amoA gene copy numbers in the surface sediment of Meiliang Bay ranged from 4.91 × 105 to 8.65 × 106 copies/g dry sediment for the archaeal amoA gene and from 3.74 × 104 to 3.86 × 105 copies/g dry sediment for the bacterial amoA gene, which were significantly higher than those of Eastern Lake Taihu (P < 0.05). Concentrations of ammonia (NH4 +), total nitrogen, organic matter, and pH of the sediments exhibited significantly negative correlations with the abundance of ammonia-oxidizing archaea or ammonia-oxidizing bacteria (P < 0.05 or P < 0.01, respectively). The potential nitrification rates show remarkable correlations with the copy numbers of the archaeal amoA gene. Diversity of the archaeal amoA gene in Eastern Lake Taihu was significantly higher than that of Meiliang Bay, whereas the bacterial amoA gene diversity was comparable for the 2 lake zones. The data obtained in this study would be useful to elucidate the role of ammonia-oxidizing archaea and ammonia-oxidizing bacteria in the nitrogen cycle of freshwater ecosystems.

Keywords: Lac Taihu; Lake Taihu; ammonia-oxidizing archaea; ammonia-oxidizing bacteria; archées oxydant l’ammoniac; bactéries oxydant l’ammoniac; environmental factors; facteurs environnementaux; sediment; sédiment

Document Type: Research Article

DOI: http://dx.doi.org/10.1139/w2012-078

Affiliations: 1: State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, People’s Republic of China. 2: College of Hydrology and Water Resources, Hohai University, Nanjing 210098, People’s Republic of China.

Publication date: August 24, 2012

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  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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