Research press release


Nature Climate Change

Unchecked global warming risks changes in marine ecosystems unprecedented in the last 3 million years


今回、Gregory Beaugrandたちは、3種類の温室効果ガス排出と関連する温暖化のシナリオの条件下における21世紀末までの海洋の生物多様性のパターンをモデル化した。そして、それぞれのシナリオに対応する3種類の将来の生物多様性のパターンを1960~2013年の期間と、地球史上で今とは気候が大きく異なっていた最終氷期のピークであった最終氷期最盛期(LGM、約26,500~20,000年前)、約300万年前までの比較的温暖であった中期鮮新世に観察された生物多様性のパターンを比較した。


Moderate warming - driven by a greenhouse-gas emissions scenario that stabilizes around 2040 - could cause major reorganizations of marine biodiversity over large oceanic regions by the end of the century, suggests a study published online this week in Nature Climate Change. These changes, such as local species extinctions and species invasions, may be three times greater than those observed over the past 50 years.

Gregory Beaugrand and colleagues modelled patterns of marine biodiversity up to the end of the twenty-first century under different emissions and associated warming scenarios. They then compared these potential future patterns of biodiversity with those seen between 1960 and 2013, as well as during two periods of Earth’s history with climates very different from today: the peak of the last ice age, the Last Glacial Maximum, (LGM), which lasted from around 26,500 to 20,000 years ago; and the mid-Pliocene, a relatively warm period ending around 3 million years ago.

The researchers project that severe global warming driven by continued growth in greenhouse-gas emissions to 2100 would have a major effect on oceanic ecosystems, with between 50 and 70% of the world’s oceans experiencing a change in marine biodiversity similar to or higher than that experienced between the LGM or mid-Pliocene and today. However, if global warming is relatively small due to emissions peaking and then declining within the next 5 years, the study suggests that biological changes would be much less dramatic and not that different from annual variability seen since the 1960s. Nevertheless, any reorganization is likely to affect ecosystem functioning, underscoring the need to better understand the effects of climate change on patterns of biodiversity.

doi: 10.1038/nclimate2650

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