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高度大气CO2和UV-B辐射的相互作用作用:对海洋藻Skeletonema pseudocostatum的多层次研究

Li Xie¹, Ailbhe Macken², Knut Erik Tollefsen³

¹Norwegian Institute for Water Research (NIVA), Økernveien 94, OSLO N-0579, Norway; Norwegian University of Life Sciences (NMBU), Centre for Environmental Radioactivity, Post box 5003, Ås N-1432, Norway.

Ecotoxicology and environmental safety

|February 16, 2025

概括

气候变化影响海洋藻. 增加的二氧化碳 (CO2) 单独促进了藻的生长,而紫外线辐射损害了它. 结合的压力因素对氧化压力和Skeletonema pseudocostatum的生长产生了协同效应.

科学领域:

海洋生物学海洋生物学
环境科学环境科学
海洋学海洋学海洋学

背景情况:

气候变化正在改变海洋条件,特别是由于二氧化碳增加而导致的海洋酸化 (OA).
海洋中紫外B (UVB) 辐射的透是一个持续的环境因素.
了解UVB和OA等压力因素的综合影响对于海洋生态系统的保护至关重要.

研究的目的:

为了研究紫外线B辐射和高CO2对海洋藻Skeletonema pseudocostatum的联合影响.
描述不同生物层面的影响:氧化应激,光合作用,颜料和生长.

主要方法:

在一项72小时的实验室实验中,S. pseudocostatum被暴露在UVB辐射 (0.5W/m2) 和不同的CO2水平 (350,500,1000 ppm) 中.
评估了活性氧物种 (ROS) 的形成,脂质过氧化 (LPO),光系统效率,色素含量,氧化酸化 (OXPHOS) 和生长.

主要成果:

增加的二氧化碳 (500 ppm) 仅仅增加了胡卜素和生长,但没有影响光系统效率或氧化应激.
仅UVB暴露就诱导了氧化应激,抑制了光合作用和OXPHOS,并减少了生长.
联合UVB和CO2暴露显示了ROS,LPO和生长抑制的协同增加,对胡卜素具有对抗作用.

结论:

联合暴露于UVB和升高的CO2对藻有复杂的,往往是协同作用的影响.
紫外线加剧了CO2引起的压力,影响了关键的生理过程和S. pseudocostatum的生长.
调查结果提供了关于未来海洋酸化和UVB场景对海洋初级生产者的潜在影响的见解.

关键词:

综合效应的结合效应.原子二氧化物原子二氧化物冲击路径的影响路径.多重压力因素造成的压力.海洋酸化是指海洋的酸化.紫外线-B辐射的辐射

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