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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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Journal Microb Ecol
Date 2007 Feb 24
PMID 17318679
Citations 11
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Abstract

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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