Characterization of hot-spring microbial mat for understanding ancient ocean environments

为了了解在古代海洋中广泛发育的叠层石的发育过程，对温泉导线上的微生物垫和薄膜进行了研究。在博士后研究人员的帮助下，我对沉积结构和水化学进行了连续观察。对从石灰华表面采集的标本也进行了遗传分析。这些分析结果表明，层状纹理基本上是日常的，反映了包括蓝藻在内的光合作用细菌的代谢周期。研究地点(如大下县长裕温泉和鹿儿岛县妙根温泉)的研究成果发表在包括3篇国际期刊论文在内的研究论文中。长垣温泉的研究与古代叠层石的相似性尤为重要。

Microbial mat and film on hot-spring travertines were studied for understanding developmental processes of stromatolites that had been widely debeloped in ancient oceans. Togetherwith a post-doc reseacher, I performed continuous observation of sedimentary texture and water chemistry. Genetic analyses were also done for the specimens collected from the travertine surfaces. The results of these analyses indicated that the laminated textures were basically daily and refrected from metabolic cycle of photosynthesic bacteria including cyanobacteria. Results from study localities (e.g., Nagayu hot-sprng in Ohita Prefecture and Myoken hot-spring in Kagoshima Prefecture) were published in reseach papers including three international journal papers. Study in Nagayu hot-spring was especially important in terms with similality with the ancient stromatolites.