最古の海洋四足の生態系は,トリアス期の海洋コミュニティの急速な複雑化を示しています
Aubrey J Roberts1,2, Maciej Rucinski1, Benjamin P Kear3
1Natural History Museum, University of Oslo, Oslo, Norway.
まとめ
海洋四足類の生態系は,ペルミア期末の大量絶滅 (EPME) の後に急速に回復した. 化石の証拠は複雑なトロフィックネットワークを明らかにし,EPMEのわずか300万年後のトライアス初期に多様な海洋脊椎動物のコミュニティが確立されたことを示しています.
科学分野:
- 古生物学
- 海洋生物学
- 進化生物学
背景:
- ペルミア期末の大量絶滅 (EPME) は海洋生態系に大きな影響を与えた.
- その後のトライアス初期には 四足類が海洋環境に侵入した.
- テトラポッドの回復と多様化のペースについては,化石データの制限があるため,不確実性があります.
研究 の 目的:
- EPME後の海洋テトラポッド生態系の回復のペースと複雑さを調査する.
- 新しく発見された トライアスの海洋四足類の生態系について
- 初期の海洋脊椎動物群の多様性やトロフィック構造を分析する.
主な方法:
- トライアス初期 (スピッツベルゲン) の化石の骨床の記述.
- イクチオサウル,アーチオサウルモルフ,テムノスポンドイルを含む海洋脊椎動物の分類の特定と分析.
- 海洋脊椎動物群の比較多様性分析
主要な成果:
- 初期のトライアス (Spassian, ~ 249 Ma) の海洋生態系における複雑なトロフィックネットワークの発見.
- 生態系には頂点の捕食者イチオサウリアン,他のイチオプテリジアン,アーキサウロモルフ,テムノスポンディル,および様々な魚が含まれていた.
- 海の脊椎動物群はEPMEの300万年後に多様で統合された四足のニッチであった.
結論:
- EPMEの後,海洋環境のテトラポッドの植民地化は迅速でした.
- トライアスの初期の海洋生態系は 意外と複雑で多様でした
- この研究は,大量絶滅後の海洋脊椎動物の回復力に関する重要な洞察を提供します.
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