Japan Geoscience Union Meeting 2019

Presentation information

[J] Oral

B (Biogeosciences ) » B-PT Paleontology

[B-PT05] Biotic History

Thu. May 30, 2019 1:45 PM - 3:15 PM 201A (2F)

convener:Isao Motoyama(Department of Earth and Environmental Sciences, Yamagata University), Takao Ubukata(Division of Geology & Mineralogy, Department of Earth & Planetary Sciences, Kyoto University), Kazuyoshi Moriya(Department of Earth Sciences, Faculty of Education and Integrated Arts and Sciences, Waseda University), Chairperson:Isao Motoyama, Takao Ubukata, Kazuyoshi Moriya

1:45 PM - 2:00 PM

[BPT05-01] Cause of accelerated evolution of Earth’s life; four-layered underground robust bio-communities played a critical role for the accelerated genome evolution as a response of mass extinction

*Shigenori Maruyama1, Akio Kanai2, Issay Narumi3 (1.Earth-Life Science Institute, Tokyo Institute of Technology, 2.keio University, 3.Toyo University)

Keywords:oxygen level, underground bio-community, accelaration of life's evolution

It has long been recognized the concept of five kingdom or six kingdom model which shows the life with difference of function and size. If believing Darwinian Evolution, how can we interpret the diversified distribution with primitive small microbes to the most evolved types of large life. If we consider the most evolved metazoans such as human being to be the result of increased free oxygen in atmosphere, why do the anoxic microbes remain on the surface.
We have engaged in the decoding Earth history Program over 30 years, and obtained the following six results, (1)Since the birth of life until 4.0Ga, three times of Great Evolution of Life (GEL) occurred, (2)Those evolutions were predominantly controlled by the pO2 increase in the environments, (3)Underground bio-communities are present forming 4-layers with boundary layers, (4)Each layer corresponds to different pO2 levels; the older the lower pO2 , (5)In between the two, where two-way genome biomes are present, although speculative, and (6)These four layers could have been formed during the 3 GEL times, accompanying many mass extinctions. Those were remained as fossil environments where evolution stopped, because of no significant environmental changes, in spite of extremely severe surface environments with frequent mass extinction and resultant accelerated evolution of life.
The result corresponds to the concept of 5-6 Kingdom which suggests the preservation of biological communities with different level of pO2 in environments. Through the Earth history, new GEC occurred with great change of pO2 , the advanced life on the surface suffered mass extinctions due to exponentially decreased pO2, instead the underground microbes invaded to the surface, and evolved there again. This is the entity of evolution of life on the earth. Therefore, the presence of robust 4 layered underground biological communities must have contributed to evolving life on this planet, in spite of severe environmental change of planets over 4.0 billion of years in the Universe, not by death, but evolved thorough GEL at 4.0Ga, 2.2Ga and 0.6Ga.