mass extinction

英語（米国） (en-US) 英語（イギリス） (en-GB)

名詞

可算名詞 不可算名詞

(evolutionary theory, geology) A sharp decrease in the total number of species in a relatively short period of time; specifically, a loss of ∼75% of all species on the planet over a geologically interval of less than 3 million years, as a result of a mass extinction event.

日本語の意味

大量絶滅：短期間に地球上の生物種の約75％が失われるような、急激かつ大規模な生物多様性の喪失現象。 / 地質学および進化論の観点から、比較的短い地質時代（約300万年以内）において、一度の大規模な滅亡事象により多数の種が絶滅する現象を指す。

英語の意味

(evolutionary theory, geology) A sharp decrease in the total number of species in a relatively short period of time; specifically, a loss of ∼75% of all species on the planet over a geologically interval of less than 3 million years, as a result of a mass extinction event.

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Scientists studying fossil records found evidence that a sudden mass extinction reshaped marine ecosystems.

化石記録を調べている研究者たちは、突然の大量絶滅が海洋生態系を一変させたという証拠を発見した。

詳細

意味（1）

(evolutionary theory, geology) A sharp decrease in the total number of species in a relatively short period of time; specifically, a loss of ∼75% of all species on the planet over a geologically interval of less than 3 million years, as a result of a mass extinction event.

Preceded by five other mass extinctions and many more small extinction events, the mass extinction currently underway is, on the one hand, like all the others in that it is nothing other than a significant reduction in the number of individual organisms inhabiting the planet and at the same time a significant reduction in the diversity of species made up by those individual organisms.

詳細

mass extinctions （ plural ）