在脱氧化反应中对珊瑚新陈代谢的微致命变化
J E Mallon1,2, A H Altieri3, T Cyronak4
1Smithsonian Marine Station, Fort Pierce, FL 34949, USA.
The Journal of experimental biology
|January 21, 2025
概括
珊瑚礁面临脱氧的威胁. 这项研究表明,一些珊瑚调整其新陈代谢以生存低溶氧 (DO) 条件,表明代谢可塑性增强珊瑚对脱氧的弹性.
科学领域:
- 海洋生物学 海洋生物学
- 珊瑚礁生态 珊瑚礁生态
- 生理生态生态学 生理生态学
背景情况:
- 沿海脱氧是全球珊瑚礁的重大威胁.
- 溶解氧 (DO) 耗尽会导致低氧引起的压力和珊瑚的死亡.
- 珊瑚对缺氧的反应是特定于物种的,取决于低DO条件的持续时间和严重程度.
研究的目的:
- 研究加勒比海珊瑚对不同程度的脱氧化的生理反应.
- 了解珊瑚所做的代谢调整,以容忍低溶解氧 (DO) 条件.
- 评估代谢可塑性在珊瑚对脱氧抵抗中的作用.
主要方法:
- 暴露加勒比海珊瑚 (Acropora cervicornis,Porites astreoides,Siderastrea siderea) 严重 (1.5毫克L-1DO),中度 (3.5毫克L-1DO) 和控制 (6毫克L-1DO) 条件两个星期.
- 测量最大量子产量 (Fv/Fm) 来评估光合作用效率.
- 量化呼吸速率和计算的代谢预算 (光合作用与呼吸的总比率,Pg:R).
主要成果:
- 所有的珊瑚在两周的脱氧后都存活了下来,但表现出致命的代谢变化.
- 在A. cervicornis中,最大量子产量 (Fv/Fm) 在一周后被抑制,在S. siderea和P. astreoides中,在脱氧后两周后被抑制.
- 在严重脱氧的情况下,A. cervicornis和S. siderea的呼吸率下降.
- 在严重脱氧的情况下,S. siderea和P. astreoides的新陈代谢预算转向光合作用主导 (更自营) .
结论:
- 珊瑚表现出特定物种的代谢可塑性,以耐受脱氧.
- 代谢调整,如改变光合作用和呼吸,是珊瑚对低溶解氧 (DO) 的抵抗的关键.
- 代谢可塑性是珊瑚礁对持续脱氧事件的弹性的一个关键因素.
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