カルシート骨格を持つ白期のスクレラクトニアンサンゴ
Jaroslaw Stolarski1, Anders Meibom, Radoslaw Przenioslo
1Institute of Paleobiology, Polish Academy of Sciences, Twarda 51/55, PL-00-818 Warsaw, Poland. stolacy@twarda.pan.pl
まとめ
7千万年前の化石サンゴは,古代のスクレラクティニアンサンゴは,アラゴニットではなく,カルシット骨格を形成していたことを明らかにしています. この発見は,サンゴの骨格の組成に関する長い間信じられてきた信念に異議を唱えている.
科学分野:
- パレオントロジー・パレオントロジー
- マリン・バイオロジー マリン・バイオロジー
- 地質化学 地質化学
背景:
- スクレラクトニンサンゴは,アラゴニット骨格のみを生成すると広く信じられています.
- 珊瑚の骨格組成を理解することは,古気候の再構築と進化論の研究に不可欠です.
研究 の 目的:
- 化石のスクレラクトニアンサンゴの骨格組成を調べるために.
- 古代のサンゴに初等カルシート骨格が存在していたかどうかを判断する.
主な方法:
- よく保存された上白亜紀の化石サンゴ (Coelosmilia sp. ) を実施する.
- 細かいスケールの骨格構造と化学組成の検査.
- 現代のスクレラクトニアンサンゴの骨格の特徴との比較.
主要な成果:
- 化石のサンゴは,現代のスクレラクチニアンと同一の構造的特徴を示しています.
- 化石の骨格は,完全には原始カルシットで構成されており,遺伝的に変化したアラゴニットではありません.
- これは,カルシットがスクレラクトニンサンゴの主要な骨格鉱物である可能性があることを示しています.
結論:
- スクレラクトニンサンゴは,異なる炭酸ポリモルフから骨格を形成する能力を持っています.
- すべてのスクレラクチニアンにおける純粋なアラゴニト骨格の仮定は誤っているかもしれない.
- この発見は,サンゴの進化と古環境の代理物の理解に意味を持つ.
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