background extinction

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background extinction

[′bak‚grau̇nd ik‚stiŋk·shən]
(evolution)
Intervals of lower extinction intensity between mass extinctions.
References in periodicals archive ?
That would be 10 extinctions per 10,000 species per year, or 1,000 times the background extinction rate.
Even this five-fold increase in background extinction rates, however, vastly understates the magnitude of the current extinction event because it is derived only from extinction of species known to science.
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