Abstract
The phylogenetic composition of a bacterial community from a hypertrophic freshwater lake in China was investigated by sequencing cloned 16S rRNA genes. Three hundred and thirty-six bacterial clones from four clone libraries in different months (March, May, July and September in 2004) were classified into 142 operational taxonomic units, most of which were affiliated with bacterial divisions commonly found in freshwater ecosystem, e.g. Alpha-, Beta-, Gamma- and Deltaproteobacteria, Bacteriodetes and Actinobacteria. The results showed that the composition of bacterial community in the July library was the most diverse one. Actinobacteria was the most significant lineage in Lake Taihu, with dominant numbers of operational taxonomic units in the May, July and September libraries. Phylogenetic analysis suggested that 53 sequences were grouped into six novel clusters which may represent specific populations indigenous to the environment. Coverage analyses indicated that the clone libraries could provide a fine inventory of bacterial diversity in the lake.
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