Phosphorus addition mitigates the combined negative effects of high temperature and nitrogen stress on corals

IF 3.2 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Marine environmental research Pub Date : 2025-05-01 Epub Date: 2025-03-07 DOI:10.1016/j.marenvres.2025.107075

Zhuojing Zhou , Huidan Yang , Sichen Li , Haochen Niu , Dongdan Yuan , Hongwei Zhao

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Abstract

Global warming and imbalances in nitrogen (N)-phosphorus (P) ratios due to increased human activity have had significant impacts on coral reef ecosystems. However, the underlying mechanisms of these impacts remain poorly understood. In this study, a controlled experiment was conducted on Acropora hyacinthus treated with different P concentrations at high temperature (30 °C) and high N level (9 μM nitrate), which was analyzed in terms of physical observations and physiological indices, as well as photosynthetic activity and fatty acid composition. The results indicated that nitrate enrichment significantly reduced Symbiodiniaceae density, total chlorophyll content, and photosynthetic efficiency, as well as notable coral bleaching. P addition alleviated some of these detrimental effects, enhancing symbiotic relationship and maintaining photosynthetic activity. Additionally, changes in fatty acid composition suggest that P supplementation may improve coral tolerance to the combined stress of heat stress and nitrate enrichment by enhancing coral heterotrophy. These findings underscore the importance of balanced nutrient ratio for corals and propose P supplementation as a potential strategy to mitigate the combined stress on coral reefs.

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添加磷可以减轻高温和氮胁迫对珊瑚的综合负面影响

全球变暖和人类活动增加导致的氮磷比失衡对珊瑚礁生态系统产生了重大影响。然而，这些影响的潜在机制仍然知之甚少。本研究以风信子Acropora hyacinthus为研究对象，在高温（30°C）和高氮（9 μM硝酸盐）条件下，对不同磷浓度处理下的风信子Acropora hyacinthus进行了物理观察和生理指标分析，并对光合活性和脂肪酸组成进行了分析。结果表明，硝酸盐的富集显著降低了共生菌科植物的密度、总叶绿素含量和光合效率，并导致珊瑚白化。磷的添加减轻了这些不利影响，增强了共生关系，维持了光合活性。此外，脂肪酸组成的变化表明，补充磷可能通过增强珊瑚的异养性来提高珊瑚对热胁迫和硝酸盐富集联合胁迫的耐受性。这些发现强调了平衡营养比例对珊瑚的重要性，并提出补充磷作为减轻珊瑚礁综合压力的潜在策略。

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来源期刊

Marine environmental research 环境科学-毒理学

CiteScore

5.90

自引率

3.00%

发文量

217

审稿时长

46 days

期刊介绍： Marine Environmental Research publishes original research papers on chemical, physical, and biological interactions in the oceans and coastal waters. The journal serves as a forum for new information on biology, chemistry, and toxicology and syntheses that advance understanding of marine environmental processes. Submission of multidisciplinary studies is encouraged. Studies that utilize experimental approaches to clarify the roles of anthropogenic and natural causes of changes in marine ecosystems are especially welcome, as are those studies that represent new developments of a theoretical or conceptual aspect of marine science. All papers published in this journal are reviewed by qualified peers prior to acceptance and publication. Examples of topics considered to be appropriate for the journal include, but are not limited to, the following: – The extent, persistence, and consequences of change and the recovery from such change in natural marine systems – The biochemical, physiological, and ecological consequences of contaminants to marine organisms and ecosystems – The biogeochemistry of naturally occurring and anthropogenic substances – Models that describe and predict the above processes – Monitoring studies, to the extent that their results provide new information on functional processes – Methodological papers describing improved quantitative techniques for the marine sciences.