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Responses to Heat and Cold Stress02:45

Responses to Heat and Cold Stress

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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.
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Global Climate Change01:50

Global Climate Change

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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.
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Decreased Body Temperature01:29

Decreased Body Temperature

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A decreased body temperature can occur in patients with hypothermia and frostbite. Heat loss with extended cold exposure overpowers the body's ability to create heat, resulting in hypothermia. Core temperature readings help classify hypothermia. Mild hypothermia is temperatures between 32 °C (89.6 °F) and 35°C (95 °F) and is caused by impaired thermoregulation. Moderate hypothermia is temperatures between 28 C (82.4 °F) and 32 °C (89.6 °F) caused by...
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Thermal Stress01:09

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If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
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As a nurse, it is vital to understand the factors affecting body temperature to monitor variations and effectively evaluate deviations from regular.
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Heat is a widely used method to control microbial growth by targeting and denaturing cellular proteins, thereby killing or inactivating microbes. This method's effectiveness is quantified using parameters such as the thermal death point (TDP), thermal death time (TDT), and decimal reduction time (D value). TDP represents the lowest temperature at which all microorganisms in a liquid suspension are eliminated within 10 minutes, whereas TDT is the time necessary to achieve sterilization at a...
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熱および冷間漂白閾値によるサンゴの温度脆弱性の解決

Yusuf C El-Khaled1, Francisca C García2, Neus Garcias-Bonet2

  • 1Division of Biological and Environmental Science and Engineering (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia. yusuf.khaled@kaust.edu.sa.

Communications biology
|December 19, 2025
PubMed
まとめ

冷水サンゴの漂白は重大な脅威です。研究者たちは、サンゴの温度変化に対する回復力をよりよく理解するために、熱ED50を補完する冷間漂白閾値を評価するための新しい「冷間ED50」メトリックを開発しました。

キーワード:
サンゴの漂白温度閾値冷間ED50熱ED50サンゴの回復力気候変動海洋生物学サンゴ礁生態学

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科学分野:

  • 海洋生物学;サンゴ礁生態学;気候変動科学

背景:

  • サンゴの漂白は主に熱ストレスに関連していますが、冷水サンゴの漂白は認識されていない脅威です。ED50などの既存の指標は熱耐性を定量化しますが、冷耐性を標準化する尺度が不足しています。

研究 の 目的:

  • サンゴの冷間漂白閾値を定量化するための新しい指標である冷間ED50を導入すること。サンゴ種の温度変動範囲を定義するために、冷間および熱ED50値を比較すること。サンゴの漂白閾値に対する微生物群集の影響を評価すること。

主な方法:

  • 熱および冷耐性をテストするために、サンゴの漂白自動化ストレスシステム（CBASS）を利用しました。夏と冬の間に3つの紅海サンゴ種（アクロポラ属、ポキロポラ・ファヴォサ、スタイロポラ・ピスティラータ）を評価しました。関連する細菌群集を分析するために微生物プロファイリングを実行しました。

主要な成果:

  • 夏にはアクロポラ属が最も高い熱ED50（38.68℃）を示し、冬にはS. pistillataが最も低い冷間ED50（15.63℃）を示しました。種特異的な細菌群集が同定され、Endozoicomonadaceaeが優占しました。夏のアクロポラ属におけるEndozoicomonadaceaeの存在量と漂白閾値の間には負の相関が見られました。

結論:

  • 新しい冷間ED50指標は、冷間漂白閾値を評価するための標準化された方法を提供します。サンゴの回復力は種によって異なり、熱と冷耐性の両方の影響を受けます。気候変動下でのサンゴの脆弱性を評価するには、二重温度耐性フレームワークが不可欠です。