現代の生物群におけるクレタセウス期末の大量絶滅のサイン
Andrew Z Krug1, David Jablonski, James W Valentine
1Department of Geophysical Sciences, University of Chicago, 5734 South Ellis Avenue Chicago, IL 60637, USA.
まとめ
クレータ紀・パレオゲン紀の大量絶滅は,海洋双valveの進化と生物地理を永久に変えました. この古代の出来事は,今日も種の起源率と地理的分布を形作り続けている.
科学分野:
- パレオントロジー・パレオントロジー
- 進化生物学の進化生物学について
- マリン・バイオロジー マリン・バイオロジー
背景:
- 大量絶滅が進化的,空間的動態に及ぼす長期的な影響は十分に研究されていない.
- クレータ紀/旧紀 (K/Pg) の大量絶滅は,地球の歴史における重要な出来事である.
研究 の 目的:
- K/Pgの大量絶滅が現代の海洋生物地理に及ぼす進化的影響を調査する.
- K/Pgイベントが発生率や空間分布パターンに与える影響を分析する.
主な方法:
- 生きている海洋双valveの遺伝子の地質学的年齢の分析.
- タクソンの現代的な地理的分布の検討.
- オリジネーションレートのシフトに関する統計分析.
主要な成果:
- K/Pgの境界で海産バイバル属の分布の有意な断絶が確認されました.
- K/Pgイベントは,海洋双valve起源率の恒久的な増加をもたらしました.
- この速度の変化は,熱帯地域で最も顕著であり,極地に向かって減少します.
結論:
- K/Pgの大量絶滅は,現代の海洋生物の分類学と生物地理学的構造に永続的な足跡を残しました.
- K/Pg後の熱帯発生率は,海洋生物多様性パターンに恒久的に影響を与えている.
- ケノゾイク期の環境の変化にもかかわらず,K/Pg絶滅の進化的遺産は残っています.
さらに関連する動画
10:23A Concoction Pipeline for Generating Molecular Operational Taxonomic Units (MOTUs) Among Riparian and Aquatic Beetles
Published on: July 11, 2025
10:14Reconstructing Terrestrial Paleoclimate and Paleoecology with Fossil Leaves Using Digital Leaf Physiognomy and Leaf Mass Per Area
Published on: October 25, 2024
関連する概念動画
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...
Threats to Biodiversity
There have been five major extinction events throughout geological history, resulting in the elimination of biodiversity, followed by a rebound of species that adapted to the new conditions. In the current geological epoch, the Holocene, there is a sixth extinction event in progress. This mass extinction has been attributed to human activities and is thus provisionally called the Anthropocene. In 2019 the human population reached 7.7 billion people and is projected to comprise 10 billion by...
The Evidence for Evolution
Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.The collection of fossils within sedimentary rocks give a record of common ancestry and often depicts the history of evolution.
What is Evolutionary History?
Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.Phylogenetic trees illustrate the evolutionary relationships among these organisms. Scientists infer organisms’ common ancestry by evaluating shared morphological and genetic characteristics. Together, the fossil...
Conservation of Declining Populations
Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.
Habitat Fragmentation
Habitat fragmentation describes the division of a more extensive, continuous habitat into smaller, discontinuous areas. Human activities such as land conversion, as well as slower geological processes leading to changes in the physical environment, are the two leading causes of habitat fragmentation. The fragmentation process typically follows the same steps: perforation, dissection, fragmentation, shrinkage, and attrition.
