関連する実験動画
Updated: Aug 19, 2026
06:20
A Simple Approach to Manipulate Dissolved Oxygen for Animal Behavior Observations
Published on: June 28, 2016
魚の酸素分泌の進化と複雑な生理学的システムの出現
Michael Berenbrink1, Pia Koldkjaer, Oliver Kepp
1School of Biological Sciences, University of Liverpool, Crown Street, Liverpool L69 7ZB, UK. michaelb@liv.ac.uk
Science (New York, N.Y.)
|March 19, 2005
まとめ
魚は,何百万年もの間,分子酸素 (O2) を水泳膀に分泌するユニークな能力を進化させた. 複雑な成分を含むこの生理学的革新は,魚の多様性に寄与した.
科学分野:
- 進化生物学の進化生物学について
- 比較生理学 比較生理学について
- 分子進化は分子進化である.
背景:
- 魚は,生理学的適応の驚くべき多様性を表しています.
- 分子酸素 (O2) を分泌する能力は,魚の重要なイノベーションであり,特に泳動膀の機能に役立ちます.
- O2分泌の進化の軌道を理解することは,魚の適応放射線を説明するために不可欠です.
研究 の 目的:
- 魚のO2分泌の進化史を再構築する.
- 眼と水泳膀の両方のO2分泌系における成分進化の配列を決定する.
- これらのシステムの進化を,魚の適応放射線と結びつける.
主な方法:
- 魚の系統における生理学的システムの比較分析.
- 特徴の進化の系統遺伝的再構築.
- 逆流交換器,ボル/ルート効果,ヘモグロビン特性,赤血球のイオン輸送を含む分子および機能的成分の検査.
主要な成果:
- 泳動膀へのO2の分泌は,目の同様のシステムから約1億年後に進化した.
- この研究は,対流交換器やヘモグロビン改変などの重要な機能成分の進化順序を明らかにしている.
- 特徴の獲得と喪失のダイナミクスをマッピングし,魚の多様性に貢献するパターンを明らかにしました.
結論:
- O2の分泌の進化は,複数の相互作用する成分を含む複雑なプロセスです.
- これらの構成要素の進化のタイミングと順番は,魚の適応放射線に重要な役割を果たしました.
- この進化の経路は,現存する魚種で観察された形態と機能の広大な多様性を説明するのに役立ちます.
関連する概念動画
02:32Osmoregulation in Fishes
When cells are placed in a hypotonic (low-salt) fluid, they can swell and burst. Meanwhile, cells in a hypertonic solution—with a higher salt concentration—can shrivel and die. How do fish cells avoid these gruesome fates in hypotonic freshwater or hypertonic seawater environments?
02:35What 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...
01:23Physiological Control of Respiration
Introduction
Breathing, a seemingly passive process, is regulated by the respiratory center in the brainstem. This center coordinates the involuntary control of respirations, which means it occurs without conscious effort, ensuring a smooth and uninterrupted pattern.
Regulation of Ventilation
The body maintains ventilation by monitoring levels of carbon dioxide (CO2), oxygen (O2), and hydrogen ion concentration (pH) in the arterial blood. Among these factors, the level of CO2 plays a crucial...
Breathing, a seemingly passive process, is regulated by the respiratory center in the brainstem. This center coordinates the involuntary control of respirations, which means it occurs without conscious effort, ensuring a smooth and uninterrupted pattern.
Regulation of Ventilation
The body maintains ventilation by monitoring levels of carbon dioxide (CO2), oxygen (O2), and hydrogen ion concentration (pH) in the arterial blood. Among these factors, the level of CO2 plays a crucial...
02:22The Colonization of Land
Changes in the environment of the early Earth drove the evolution of organisms. As prokaryotic organisms in the oceans began to photosynthesize, they produced oxygen. Eventually, oxygen saturated the oceans and entered the air, resulting in an increase in atmospheric oxygen concentration, known as the oxygen revolution approximately 2.3 billion years ago. Therefore, organisms that could use oxygen for cellular respiration had an advantage. More than 1.5 years ago, eukaryotic cells and...
01:20Gas Exchange and Transport
Gas exchange, the intake of molecular oxygen (O2) from the environment and the outflow of carbon dioxide (CO2) into the environment, is necessary for cellular function. Gas exchange during respiration occurs largely via the movement of gas molecules along pressure gradients. Gas travels from areas of higher partial pressure to areas of lower partial pressure. In mammals, gas exchange occurs in the alveoli of the lungs, which are adjacent to capillaries and share a membrane with them.
01:20Respiration and Gaseous Exchange
The intricate interplay between the cardiovascular and respiratory systems is crucial for efficiently transporting respiratory gases throughout the body. Let us explore the cardiovascular system's multifaceted functions, emphasizing its pivotal role in gas exchange.
Respiration involves the exchange of gases, especially oxygen (O2) and carbon dioxide (CO2), between the alveoli and body cells, a process facilitated by blood circulation. As a result, the cardiovascular system, which involves the...
Respiration involves the exchange of gases, especially oxygen (O2) and carbon dioxide (CO2), between the alveoli and body cells, a process facilitated by blood circulation. As a result, the cardiovascular system, which involves the...