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        Microbial Community Analysis of a Coastal Hot Spring in Kagoshima, Japan, Using Molecular- and Culture-based Approaches

        Minako Nishiyama,Shuichi Yamamoto,Norio Kurosawa 한국미생물학회 2013 The journal of microbiology Vol.51 No.4

        Ibusuki hot spring is located on the coastline of Kagoshima Bay, Japan. The hot spring water is characterized by high salinity, high temperature, and neutral pH. The hot spring is covered by the sea during high tide, which leads to severe fluctuations in several environmental variables. A combination of molecular- and culture-based techniques was used to determine the bacterial and archaeal diversity of the hot spring. A total of 48 thermophilic bacterial strains were isolated from two sites (Site 1: 55.6°C; Site 2: 83.1°C) and they were categorized into six groups based on their 16S rRNA gene sequence similarity. Two groups (including 32 isolates)demonstrated low sequence similarity with published species,suggesting that they might represent novel taxa. The 148clones from the Site 1 bacterial library included 76 operational taxonomy units (OTUs; 97% threshold), while 132clones from the Site 2 bacterial library included 31 OTUs. Proteobacteria, Bacteroidetes, and Firmicutes were frequently detected in both clone libraries. The clones were related to thermophilic, mesophilic and psychrophilic bacteria. Approximately half of the sequences in bacterial clone libraries shared <92% sequence similarity with their closest sequences in a public database, suggesting that the Ibusuki hot spring may harbor a unique and novel bacterial community. By contrast, 77 clones from the Site 2 archaeal library contained only three OTUs, most of which were affiliated with Thaumarchaeota.

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