パレオゾーイク時代に絶滅する環境の傾向

J J Sepkoski¹

¹Department of the Geophysical Sciences, University of Chicago, IL 60637, USA.

Science (New York, N.Y.)

|January 2, 1987

まとめ

パレオゾイク期の海洋社会は,オフショアでの絶滅の増加を示しているが,個々の属の絶滅はオンショアでより高い. このパターンは,環境の安定性を反映し,異なる分類の絶滅率に影響を与えています.

科学分野:

パレオントロジー・パレオントロジー
海洋生態学海洋生態学とは
ストラティグラフィーストラティグラフィー

背景:

絶滅のパターンは,海洋コミュニティのダイナミクスと進化を理解するために不可欠です.
岸付近などの環境要因は,種の生存に大きく影響する.
以前の研究では,異なる分類群の絶滅感が異なることを示唆している.

研究の目的:

環境のグラデーションを横断するパレオゾイク海の集合体における絶滅の強度パターンを調査する.
コミュニティレベルでの絶滅傾向が個々の分類分類のクラスと異なるかどうかを判断する.
絶滅パターンと環境の予測可能性と安定性を相関させる.

主な方法:

505のパレオゾイク海洋化石の集合から絶滅の強度の分析.
アセンブリの分類は6つの異なる環境ゾーンと40のストラティグラフィック間隔に分類されます.
コミュニティレベルと分類階級レベルの両方で絶滅率の比較.

主要な成果:

海洋コミュニティ全体は,オフショアに移動する絶滅率の増加を示した.
個々の分類学クラス内の遺伝子は,近岸環境でより高い絶滅率を示した.
観察されたコミュニティレベルでの傾向は,海岸付近のゾーンで絶滅率が低い分類種の分布に起因する.

結論:

環境の安定性は,海洋絶滅のダイナミクスにおいて重要な役割を果たしています.
予測可能な安定した環境 (オフショア) の生物は,変動する近岸環境の生物よりも低い絶滅を経験しました.
絶滅のパターンは規模に依存し,コミュニティ全体と個々の分類群によって異なる.

キーワード:

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