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Microb Ecol. 2007 Oct;54(3):497-507. Epub 2007 Feb 22.

Microbial community composition of the Danshui river estuary of Northern Taiwan and the practicality of the phylogenetic method in microbial barcoding.

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Department of Life Science, National Taiwan Normal University, No. 88 Ting-Chow Rd., Sect. 4, Taipei, 116, Taiwan, Republic of China.


In this study, the microbial community in a mangrove ecosystem was surveyed and used to test the eligibility of 16S rDNA library and neighbor-joining method for the purpose of estimating microbial composition. Genetic diversity (pi) and four other diversity indices (Simpson's unbiased, Shannon-Wiener, Evenness, and Chao1 indices) were applied to estimate the adaptive lineages of microorganisms in the mangrove ecosystem. The results indicated that gamma-Proteobacteria is the most diverse taxon, while the most abundant family is Rhodobacteraceae (alpha-Proteobacteria), followed by Comamonadaceae (beta-Proteobacteria). This result may imply the existence of a graded distribution of microbial diversity across a spectrum of different salinities in the waterbody of this estuary ecosystem. Furthermore, at least 500-1,000 bps of the posterior portion of 16S rDNA is required as a marker to profile the microbial diversity in a microcosm of interest using phylogenetic methods, according to the results of our sliding window analyses for the measurements of pi, consistency index, and retention index.

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