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background extinction
(redirected from Background extinction rate)

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background extinction [′bak‚grau̇nd ik‚stiŋk·shən]
(evolution)
Intervals of lower extinction intensity between mass extinctions.
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That would be 10 extinctions per 10,000 species per year, or 1,000 times the background extinction rate.
Bye bye, birdie ... and myriad other creatures humans are wiping out by DeWeerdt, Sarah / World Watch
At current levels of destruction, only 5 percent of tropical forests will remain in protected areas within 50 years, says the report, causing the rate of species loss to reach three or four orders of magnitude higher than the natural background extinction rate of about one species each year.
Biodiversity projections look grim by Porter, Sarah / World Watch
 
 
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