The bioavailability and component characteristics of the aging dissolved organic matter (DOM) from the macroalgae Ulva prolifera in seawater

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research Pub Date : 2025-02-01 DOI:10.1016/j.marenvres.2025.106946

Xinyu Li , Cui Zeng , Xiurong Han , Xiulin Wang , Keqiang Li

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引用次数: 0

Abstract

The world's largest green tide, caused by Ulva prolifera, in the Yellow Sea negatively affects the social and economic development of China's coastal region. The dissolved organic matter (DOM) released from U. prolifera is a potential threat to the offshore ecological health. The bioavailability and component characteristics of the DOM from U. prolifera vary at different aging stages in marine environments and are poorly understood. Here, a 1-year incubation experiment was conducted to understand this phenomenon. The bioavailable DOM (BDOM) mainly comprised the labile bioavailable DOM (LBDOM), which accounts for 58.7% (in dissolved organic nitrogen (DON)%) in the aging stages of 0–12 days. LBDOM mainly comprised three-dimensional fluorescent tyrosine B and tryptophan T components. The semi-labile bioavailable DOM (SLBDOM) accounted for 29.2% in the aging stages of 12–80 days, which mainly comprised fulvic acid C1 and A components. Both LBDOM and SLBDOM mainly contained amine groups in their structures. Conversely, the refractory bioavailable DOM (RBDOM) accounted for only 6.50% in the aging stages of 80–365 days. RBDOM mainly comprised a humin-like acid C2 component, whereas refractory dissolved organic matter (RDOM) mainly comprised humin-like acid C2, E, and fulvic acid A components, and the structures of both mainly included functional groups, such as hydroxyl, carboxyl, alkynyl, and aromatic rings. The hydrophobic component and dissolved organic carbon (DOC) proportion increased with the aging of DOM in seawater. Thus, the aging of DOM in seawater represents the processes of aromatization, hydrophobization, and humification, wherein the SUVA₂₅₄, SUVA₂₆₀, and humification index (HIX) increased by 55.7, 42.9, and 133.0%, respectively. The results of our study contribute to a deeper understanding of the ecological effects of DOM released during the extinction process of U. prolifera in the ocean.

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海水中巨藻藻老化溶解有机物（DOM）的生物利用度和组成特征。

黄海由藻藻引起的世界最大绿潮对中国沿海地区的社会经济发展产生了负面影响。藻体释放的溶解性有机物（DOM）是近海生态健康的潜在威胁。在海洋环境中，不同老化阶段增殖藻DOM的生物利用度和组成特征不同，但目前对其了解甚少。为了了解这一现象，我们进行了为期1年的孵化实验。生物可利用DOM （BDOM）以不稳定生物可利用DOM （LBDOM）为主，在0 ~ 12 d的老化阶段占溶出有机氮（DON）%的58.7%。LBDOM主要由三维荧光酪氨酸B和色氨酸T组成。在12 ~ 80 d的老化阶段，半不稳定的生物可利用DOM （SLBDOM）占29.2%，主要由黄腐酸C1和A组成。LBDOM和SLBDOM的结构中都主要含有胺基。相反，在80 ~ 365天的老化阶段，难降解的生物可利用性DOM （RBDOM）仅占6.50%。RBDOM主要由类人酸C2组分组成，难溶性有机物（RDOM）主要由类人酸C2、E和黄腐酸a组分组成，两者的结构主要包括羟基、羧基、炔基和芳环等官能团。海水中DOM的疏水组分和溶解有机碳（DOC）比例随着老化而增加。DOM在海水中的老化表现为芳构化、疏水性和腐殖化过程，其中SUVA254、SUVA260和腐殖化指数（HIX）分别增加了55.7、42.9和133.0%。本研究的结果有助于我们更深入地了解海洋中U. prolifera灭绝过程中释放的DOM的生态效应。

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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.