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"幽霊"ナノ化石の世界記録は,高CO2と温暖化に対するプランクトンの回復力を明らかにしています
Sam M Slater1, Paul Bown2, Richard J Twitchett3
1Department of Palaeobiology, Swedish Museum of Natural History, SE-104 05 Stockholm, Sweden.
Science (New York, N.Y.)
|May 19, 2022
まとめ
海洋ナノプランクトンの化石は これらの生物が 過去の気候温暖化に かつて考えられていたよりも 強い抵抗力を持っていることを示唆しています 新しい"幽霊"化石記録は 保存されたナノプランクトンを明らかにし 過去のバイオカルシフィケーション危機の解釈に挑戦しています
科学分野:
- 古生物学
- 気候科学
- 海洋生物学
背景:
- 海洋の化生物は 気候変動の影響の重要な指標です
- 過去の地球温暖化現象は,ナノプランクトンの化石記録に基づいた生物カルシフィケーション危機としてしばしば解釈されます.
- カルシウム炭酸 (CaCO3) の溶解は,海洋微生物の保存に重大な影響を及ぼします.
研究 の 目的:
- 過去の温暖化が海洋ナノプランクトンに及ぼす影響を再評価する.
- 温暖化期間中の伝統的なナノプランクトン化石記録の信頼性を調査する.
- 海洋酸化と温暖化に対する ナノプランクトンの回復力を評価する
主な方法:
- インプリントまたは"ゴースト"ナノ化石の世界的な記録の分析.
- ジュラ紀と白亜紀の温暖化現象におけるナノプランクトン保存の検討
- インプリント化石データと伝統的なCaCO3ベースの化石記録の比較.
主要な成果:
- 精巧に保存されたナノプランクトンは プリントの化石を用いて 推測されたジュラ紀の生物カルシフィケーション危機中に発見されました
- クレータ紀の温暖化現象は,CaCO3溶解によって化石記録が強く歪められたことを示しています.
- ナノプランクトンは 伝統的な化石の証拠よりも 過去の温暖化に より強い抵抗力を示しました
結論:
- 伝統的なナノプランクトン化石記録は,溶解による過去の温暖化イベントの影響を過大評価する可能性があります.
- ナノプランクトンの気候変化への抵抗性は過小評価されているかもしれない.
- ナノプランクトンの急速な現代的な気候変動への反応を完全に理解するにはさらなる研究が必要である.
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