4 世紀 に おける 最も 熱い 海 は,グレート バリア リーフ を 危険 に 晒す
Benjamin J Henley1,2,3, Helen V McGregor4,5, Andrew D King6,7
1Environmental Futures, School of Earth, Atmospheric and Life Sciences, University of Wollongong, Wollongong, New South Wales, Australia. bhenley@unimelb.edu.au.
Nature
|August 7, 2024
まとめ
グレート・バリア・リーフ (GBR) の大量珊瑚白化現象は,過去400年間に記録的な海面温度 (SST) と関連しています. 人為的な気候変動は GBRの生態系に 存在上の脅威をもたらしています
科学分野:
- 海洋生物学
- 気候科学
- エコロジー
背景:
- 2016年から2024年の間にグレートバリアリーフ (GBR) での大規模なサンゴ白化が起きたのは,海面温度 (SST) の上昇によって引き起こされた.
- 最近のGBRの温度の長期的な熱的背景は不明であり,脅威の評価に影響を与えています.
研究 の 目的:
- サンゴ海地域における 長期的な熱異常を再現し分析する
- GBRの最近の極端な暑さやサンゴの漂白の原因を特定する.
- GBRの生態系の現状と将来の脅威を評価する.
主な方法:
- 過去400年のサンゴ海の表面温度に関する古気候再構築.
- 最近のSSTデータ (2016-2024) の分析と再構築された温度との比較
- 温暖化傾向を人間の影響と結びつけるための 気候モデル分析
主要な成果:
- 2024年,2017年,2020年のサンゴ海の熱は400年で最も高かった.
- 最近の暑さ (2016年,2004年,2022年) も歴史的な気温の限界を超えました.
- 最近の急速な温暖化の原動力として 気候システムに対する人間の影響が確認されています
結論:
- 人為的な気候変動による GBRの生態系に対する 存在上の脅威は 明らかになっています
- 緊急の介入がなければ 珊瑚礁はほぼ毎年 白化が起こり 生物多様性と生態系サービスが 脅かされます
- 温暖化傾向が続くと,地球温暖化の生態的機能と普遍的な価値が危うくなります.
関連する概念動画
Global Climate Change
24.3K
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
24.3K
Primary Production
23.6K
The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
23.6K
Threats to Biodiversity
22.2K
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...
22.2K
Osmoregulation in Fishes
49.5K
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?
49.5K
Responses to Heat and Cold Stress
13.4K
Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
13.4K
Oxygen Transport in the Blood
2.6K
Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...
2.6K


