デボニア海中期の酸素化により,動物がより深い海域に広がった
Kunmanee Bubphamanee1,2, Michael A Kipp2,3,4, Jana Meixnerová1
1Department of Earth and Space Sciences, University of Washington, Seattle, WA 98195-1310.
まとめ
地球の古代の海はデボニアン期まで ほとんど無酸素だった. 陸上の森林の出現は 永久的な深海の酸素化をもたらし 海洋革命と複雑な動物の進化を助長しました
科学分野:
- 古代海洋学
- 地化学
- 古生物学
背景:
- 地球の酸素化の歴史は メタゾアの進化に大きく影響した.
- 前回の考え:ネオプロテロゾイク 酸素化のイベントは動物起源を可能にしました.
- 最近のリドックスプロキシはデボニア後期まで 持続的な深海の無酸素を示唆している.
研究 の 目的:
- セレニウム (Se) プロキーを用いて,パレオゾイク深海の酸素化を再構築する.
- 陸上の植物の進化と海洋の酸素レベルとの関係を調べる
- 紀元中期の海洋革命のタイミングと要因を明らかにする.
主な方法:
- セレニウム濃縮とイソトープの比率を分析した.
- エディアカランからデボニアン期までの 還酸化プロキシデータを利用した.
- 陸上の古植物学的記録と相関する海洋リドックスデータ.
主要な成果:
- エディアカランとカンブリアの境界で 記録された一時的な酸素化
- 初期デボニアン (419393万年) の間,主に無酸素の深海状態が明らかになった.
- 中デボニア (393382万年) から始まった永久的な深海の酸素化は,広範囲に広がった陸上の森林と一致している.
結論:
- 初期の森林の広がりや 木質の生物質の埋葬により 炭素が吸収され 海洋の酸素が増加しました
- この酸素化の出来事は 大型の海洋生物の生態的膨張と 進化的放射を促した.
- 陸上の植物の進化は"中古の海洋革命"の主要な原動力であった.
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