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background extinction rate
Background extinction rate, also known as ‘normal extinction rate’, refers to the standard rate of extinction in earth’s geological and biological history before humans became a primary contributor to extinctions. This is primarily the pre-human extinction rates during periods in between major extinction events.
==Overview==
Extinctions are a normal part of the evolutionary process, and the background extinction rate is a measurement of “how often” they naturally occur. Normal extinction rates are often used as a comparison to present day extinction rates, to illustrate the higher frequency of extinction today than in all periods of non-extinction events before it.〔E.g. 〕
Background extinction rates have not remained constant, although changes are measured over geological time, covering millions of years.〔Raymond, H, Ward, P: “Hypoxia, Global Warming, and Terrestrial Late Permian Extinctions” Page 389–401. Science 15, 2005. http://www.sciencemag.org/cgi/content/full/308/5720/398〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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