两种海洋硅藻对pH和辐照度的多性状响应揭示了由硅化介导的光和酸化的相互作用

IF 3.8 1区地球科学 Q1 LIMNOLOGY

Limnology and Oceanography Pub Date : 2025-03-11 DOI:10.1002/lno.70014

Billy FitzGerald‐Lowry, Daniel Aagren Nielsen, Rebecca Julianne Duncan, Alyson May Theseira, Georgia Thompson, Katherina Petrou

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引用次数: 0

摘要

人为气候变化引起的海洋生态系统变化正在影响包括浮游植物在内的海洋生物。海洋酸化和变暖是海洋浮游植物面临的两大威胁，导致海洋上层混合层发生重大变化，浮游植物分布发生重组，生理代谢发生重组。在这项研究中，我们研究了两种“模式”硅藻物种褐藻（Phaeodactylum tricornutum）和海硅藻（Thalassiosira weissflogii）在低（~ 350）和预测未来（~ 800）pCO2浓度下(低（20 μmol光子m−2 s−1）和高（200 μmol光子m−2 s−1）的生物分子组成和硅化速率的变化，模拟了气候变化引起的海洋浅滩化和酸化的影响。具体来说，我们的研究条件引起了两种物种脂质和蛋白质含量的变化。我们还发现pCO2对T. weissflogii在强光下产生二氧化硅的负面影响，这与光化学效率的提高有关。光与pCO2之间的这种相互作用与二氧化硅的产生表明，在硅藻光合作用和光保护（能量平衡）中，晶体具有潜在的控制作用。基于这些数据，海洋浅滩化和酸化有可能通过影响硅藻壳合成和光生物学来影响硅藻的营养价值和生物地球化学作用。

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Multi‐trait responses in two marine diatoms to pH and irradiance reveal interactive effect of light and acidification, mediated by silicification

Ocean ecosystem shifts in response to anthropogenic climate change are impacting marine organisms, including phytoplankton. Ocean acidification and warming represent two key threats to marine phytoplankton, causing significant changes to the upper mixed layer of the ocean, reshuffling their distribution, and reorganizing their physiology and metabolism. In this study, we investigated changes in biomolecular composition and silicification rates of the two “model” diatom species Phaeodactylum tricornutum and Thalassiosira weissflogii under low (~ 350) and projected future (~ 800) pCO2 concentrations with low (20 μmol photons m−2 s−1) and high (200 μmol photons m−2 s−1) light, simulating expected climate change‐induced impacts of ocean shoaling and acidification. Specifically, our study conditions elicited changes in lipid and protein content in both species. We also found a negative effect of pCO2 on silica production under high light in T. weissflogii that was linked to improved photochemical efficiency. This interactive effect between light and pCO2 with silica production suggests a potential controlling role of the frustule in diatom photosynthesis and photoprotection (energy balance). Based on these data, ocean shoaling and acidification have the potential to influence the nutritional value and biogeochemical role of diatoms through its effect on diatom frustule synthesis and photobiology.

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来源期刊

Limnology and Oceanography 地学-海洋学

CiteScore

8.80

自引率

6.70%

发文量

254

审稿时长

3 months

期刊介绍： Limnology and Oceanography (L&O; print ISSN 0024-3590, online ISSN 1939-5590) publishes original articles, including scholarly reviews, about all aspects of limnology and oceanography. The journal''s unifying theme is the understanding of aquatic systems. Submissions are judged on the originality of their data, interpretations, and ideas, and on the degree to which they can be generalized beyond the particular aquatic system examined. Laboratory and modeling studies must demonstrate relevance to field environments; typically this means that they are bolstered by substantial "real-world" data. Few purely theoretical or purely empirical papers are accepted for review.