Tuesday, September 28, 2010

Oxygen increase in the Devonian Period

There's new evidence of a substantial increase in ocean oxygen content during the Devonian period about 400 million years ago.  That was around the time that vascular plants arose, so perhaps that's what caused the increase.  At the same time more complicated animals such as predatory fish evolved  - so perhaps the higher level of oxygen is what made that possible.   See Plants set stage for evolutionary drama in Nature.

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