大量絶滅後のパレオゾイク期後の海洋属の長寿が増加した

Arnold I Miller¹, Michael Foote

¹Department of Geology, University of Cincinnati, Post Office Box 210013, Cincinnati, OH 45221-0013, USA. arnold.miller@uc.edu

Science (New York, N.Y.)

|November 8, 2003

まとめ

大量絶滅の後に発生した海洋分類群は,特にパレオゾイク後期において,地質学的寿命が延びていることを示している. これは,絶滅イベントの影響を受けた明確な多様化ダイナミクスを示唆しています.

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
進化生物学の進化生物学について

背景:

大量絶滅の後の回復期に発生した海洋分類群は,しばしばより広い地理的範囲を示します.
地理的な範囲と海洋種の長寿との間には相関関係がある.
これは,回復分類が地質学的に異常に長生きしていた可能性があることを示唆しています.

研究の目的:

大量絶滅の回復期に発生した海洋個体群が地質学的により長生きしていたかどうかを調査する.
ファネロゾーイクイオンにおける海洋属コホートの長寿を分析する.
パレオゾーイクとポストパレオゾーイク時代の多様化ダイナミクスにおける潜在的な違いを特定する.

主な方法:

ファネロゾーイクイオン全体で連続したサブステージで発生した海洋属コホーートの分析.
これらのコホートの地質学的長寿の評価.
回復コーホートと他のコーホートの間の長寿の統計的比較.

主要な成果:

いくつかの大量絶滅の回復コホートは,他のコホートよりも著しく長生きすることが判明しました.
長寿の増加のこの現象は,主にパレオゾーイク後期に観察されました.
この効果は,古生物学期に起源を持つコホートでは一貫して観察されなかった.

結論:

大量絶滅の回復コホートは,以前の仮説を裏付けるように,延長された地質学的寿命を示すことができます.
海洋分類種の多様化の動態は,古生代と後生代の間に異なっています.
絶滅の出来事は,海洋生物の長期的な進化の軌道を形作る上で重要な役割を果たします.

さらに関連する動画

13:18

Data Collection on Marine Litter Ingestion in Sea Turtles and Thresholds for Good Environmental Status

Published on: May 18, 2019

08:43

Aerobic Biodegradation Testing of Materials Using a Natural Marine Seawater Inoculum and Closed Loop Respirometer

Published on: October 24, 2025

関連する概念動画

00:46

Bioremediation

Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.

02:04

Conservation of Small Populations

Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less likely to...

02:56

The Fossil Record

The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...

01:30

Marine Microbial Ecology

Marine microbial ecosystems are shaped by distinct physicochemical limits, including high salinity, low nutrient availability, and fluctuating oxygen levels. These conditions favor smaller microbial cell sizes, which maximize their surface-to-volume ratio for efficient nutrient uptake.Microbial activity and community composition are closely linked to biogeochemical cycles, particularly in dynamic environments like estuaries, where halotolerant microbes thrive in response to variable salinity...

01:18

Deep Sea Microbial Ecology

The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches extending beyond...

01:26

Microbial Bioremediation of Hydrocarbons

Bioremediation is an environmentally sustainable process that employs living organisms—primarily microorganisms—to degrade or neutralize pollutants from contaminated environments. In oil spills and hydrocarbon pollution, bioremediation involves the use of hydrocarbon-degrading bacteria to transform toxic compounds into less harmful substances. This approach leverages natural microbial metabolic processes and is considered both cost-effective and ecologically favorable compared to physical or...

関連する実験動画