ダイアトムの殻の建築と材料の性質は,効果的な機械的保護を提供します
Christian E Hamm1, Rudolf Merkel, Olaf Springer
1Alfred Wegener Institute for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germany. chamm@awi-bremerhaven.de
Nature
|February 21, 2003
まとめ
フルストゥールと呼ばれるダイアトムの細胞壁は,非常に強く,肉食動物から機械的に保護します. この進化的優位性は,水生生物の食物網と地球的な炭素循環に影響を与えます.
科学分野:
- マリン・バイオロジーの海洋生物学
- エコロジー エコロジー エコロジー
- バイオジオケミストリー バイオジオケミストリー
背景:
- ダイアトムは,水生生態系における重要な主要な生産者であり,地球的な炭素循環に大きく影響を与えます.
- 独特の状の細胞壁,フルスチュールには複雑な構造がありますが,その適応的役割は議論の余地があります.
- 捕食者に対する保護としてのフルスチュルの機能は,調査の重要な分野です.
研究 の 目的:
- 捕食者に対する防御機構として,藻のの機械的強さを調査する.
- 細胞保護におけるフルスチュール構造とシリカ材料の性質の役割を理解する.
主な方法:
- 生きたダイアトムの細胞に校正されたガラスのマイクロニードルを使用して物理的な強度試験.
- ダイアトムの果実体 (frustules) に関する有限要素モデリング (FEM) を採用した仮想機械分析.
- 中心型およびペナト型ダイアトーム種の比較分析.
主要な成果:
- ダイアトムフルスチュールは特殊な機械的強度を示し,大きな施加力に抵抗します.
- 複雑な建築とダイアトムシリカの固有の性質の両方が,この頑丈さに貢献しています.
- frustulesを断ち切るには,実質的な力が必要であり,効果的な物理的保護を示しています.
結論:
- ダイアトムのは,強力な機械的保護を提供して,主要な防衛機構として進化しました.
- フルスチュールの強さは,藻類の進化の成功に重要な要因である.
- ダイアトムを含む捕食者と獲物の相互作用は,ペラジック食物網の構造と生地化学的プロセスを形作っています.
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