ペルム紀大絶滅の原因は微生物?


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[April 2 AFP] Although the cause by which almost all the living things on the earth became extinct 252 million years ago may be made into a volcano or an asteroid, The paper which suggests that the true culprit was a far smaller microbe than them was announced by the U.S. science journal “rice science academy bulletin (Proceedings of the National Academy of Sciences, PNAS)” on the 31st of the last month.
The researchers of ? U.S. Massachusetts Institute of Technology (Massachusetts Institute of Technology, MIT) and China, It asked for why the greatest “end mass extinction of ペルム 紀” in the mass extinction which occurred in the history of [ five ] the earth occurred, and the explanation about such large-scale extinction like this having occurred in the short period of tens of thousands of years why, and investigated the sediment in the rock formation in southern China.
?, as a result the sea — suddenly — it is said that the new theory that the microbe which carries out and is known as “メタノサルキナ (Methanosarcina)” which carried out extensive generating blew off methane in the atmosphere and caused a dramatic change in marine chemical constitution and the climate of the earth was drawn.
Nickel is emitted to natural environment by eruption and the researcher of ?MIT and Mr. Gregory Fournier (Gregory Fournier) explain that possibly this stimulated breeding of a microbe, although mass extinction cannot explain the reason which advanced so quickly only by a volcanic eruption.
Mr. Fournier says, “It decreasing gradually after that, if carbon dioxide (CO2) spouts rapidly from a volcano (CO2 quantity).”
“But it was the opposite in practice and was increasing succeedingly.
This has suggested multiplication of a microbe.”
Mr. Fournier says that it may be able to explain the speed of advance of mass extinction, and the size of a scale by this in the end of ペルム 紀 since ? microbe can make carbon production increase rapidly.
Researches of ? this time are the National Aeronautics and Space Administration (NASA) and National Science Foundation (). [ National Science Foundation and ] NSF, the China state natural science fund committee () [ National Natural Science Foundation of China and ] In response to funding, it was carried out from NSFC and the China state important basic research development plan (National Basic Research Program of China, NBRPC).
(c)AFP




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