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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Background extinction rate ： ウィキペディア英語版 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）』 ■ウィキペディアで「Background extinction rate」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.