Evolutionary History of Microbial Ecosystem

Abstract

  The rRNA-gene phylogeny of modern life revealed possible evolutionary history of microorganisms, and suggested their ancestral organism came from thermal environments. If the assumption which raised from the gene sequences indicates right direction of life evolution, it must correspond with geological clues, such as the evidences of fossil and biomaker, and the paleoecological studies. Multidisciplinary collaboration with geologists, meteologist and microbiologists recently disclose the Archean life history from the oldest sedimentary rocks and the molecular records within gene sequences. The knowledge may be still fragmentally, and some of them remains under discussion. The hypothetical history of microbial ecosystem written in this article opens after the first Earth’s biosphere established by ancestral microorganism.