Marine environmental research最新文献_第5页

Tracking photoinhibition and failure dynamics in algae under combined exposure to UVB and water-accommodated oil fractions 跟踪海藻在UVB和水容油组分联合暴露下的光抑制和失效动力学

IF 3.2 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2026-01-22 DOI: 10.1016/j.marenvres.2026.107862

V.F. Torosyan , V. Yu Timofeev , Ratchagaraja Dhairiyasamy , Deekshant Varshney , Subhav Singh

Increasing UV radiation and persistent petroleum-derived contaminants in aquatic environments have raised concerns regarding their combined effects on primary producers. Microalgae, such as Chlorella vulgaris, are particularly vulnerable owing to their surface-dwelling nature and their high sensitivity to impairment of photosystem II (PSII). The hazards associated with photosynthetic failure under ultraviolet (UV) stress in the presence of oil-derived mixtures remain inadequately quantified, particularly under environmentally realistic light spectra. This study addressed this knowledge gap by characterizing the joint effects of UV radiation and petroleum hydrocarbons on algal PSII function and viability. This study aimed to quantify failure thresholds using PAM fluorometry and survival analysis, and to link these with passive sampling of freely dissolved hydrocarbons. A programmable solar simulator was employed to deliver PAR + UVA and PAR + UVA + UVB exposures for 72 h, whereas water-accommodated fractions (WAFs) of crude oil, with and without an anionic surfactant, were administered at environmentally relevant concentrations. The PDMS passive samplers were calibrated for the target polycyclic aromatic hydrocarbons (PAHs) and their uptake kinetics were validated. Time-to-failure was defined as the crossing of an Fv/Fm ≤ 0.4 threshold, and hazard curves were generated across treatment groups. Notably, failure hazards increased significantly under UVB irradiation, particularly in WAF treatments combined with surfactants at critical micelle concentrations, indicating synergistic phototoxicity. These findings highlight the elevated risk posed by the combined UV and chemical stressors on phytoplankton productivity. The framework developed in this study provides a robust method for quantifying failure risks under multi-stressor conditions. Future research should explore the dynamics of chronic adaptation and the community-level effects of natural systems.

水生环境中不断增加的紫外线辐射和持久性石油衍生污染物引起了人们对它们对初级生产者的综合影响的关注。微藻，如小球藻，由于其表面生活的性质和对光系统II （PSII）损伤的高度敏感性，特别容易受到伤害。在油衍生混合物存在的紫外线胁迫下，与光合作用失败相关的危害仍然没有充分量化，特别是在环境现实的光谱下。本研究通过表征紫外线辐射和石油碳氢化合物对藻类PSII功能和活力的共同影响来解决这一知识空白。本研究旨在使用PAM荧光测定法和存活分析来量化失效阈值，并将这些与自由溶解碳氢化合物的被动采样联系起来。使用可编程太阳模拟器进行PAR + UVA和PAR + UVA + UVB照射72小时，而原油的水容馏分（was），无论是否使用阴离子表面活性剂，都以环境相关浓度进行处理。对PDMS被动采样器的目标多环芳烃（PAHs）进行了标定，并验证了其吸收动力学。失效时间定义为Fv/Fm≤0.4阈值的交叉点，并生成各治疗组的危险曲线。值得注意的是，在UVB照射下，失效危险显著增加，特别是在临界胶束浓度的WAF处理与表面活性剂联合使用时，表明协同光毒性。这些发现强调了紫外线和化学胁迫对浮游植物生产力造成的风险增加。本研究开发的框架为在多应力条件下量化失效风险提供了一种可靠的方法。未来的研究应探索慢性适应的动态和自然系统的社区效应。

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引用次数: 0

Characterization and potential risks of microplastics in marine mollusks using the laser direct infrared (LDIR) technique 利用激光直接红外（LDIR）技术表征海洋软体动物体内微塑料及其潜在风险

IF 3.2 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2026-01-21 DOI: 10.1016/j.marenvres.2026.107871

Jia Teng , Shuang Zhao , Jianmin Zhao , Dongyu Wang , Jiashen Li , Yan Fang , Qing Wang , Yuting Zhao

Microplastics (MPs) pollution in marine environments is a growing concern, especially where mollusks for human consumption are harvested. This study investigated the contamination and potential risks of MPs in mollusks collected from the Yantai coastal waters using Laser Direct Infrared (LDIR) imaging. The average MPs abundance was 7.55 ± 4.87 items/g (w.w.) in mollusks soft tissues. The carnivorous Buccinum undatum exhibited the highest MP load, likely due to biomagnification. Spearman correlation analysis revealed a negative relationship between MPs abundance and mollusk biological traits, suggesting that larger individuals have lower concentrations. Fibers (52.63 %) and small particles <50 μm (76.19 %) dominated the composition and polyethylene was the most common polymer. The Polymer Hazard Index (PHI) value of 2115 indicated a high risk level (V). The estimated average annual MP intake from mollusk consumption was 24,680 particles/person/year, highlighting potential health concerns. This study provides crucial data for understanding MP pollution in mollusks and its potential risks.

海洋环境中的微塑料污染日益受到关注，特别是在收获供人类食用的软体动物的地方。采用激光直接红外（LDIR）成像技术，对烟台沿海海域采集的软体动物体内多磺酸盐的污染情况及潜在危害进行了研究。软体动物组织中MPs的平均丰度为7.55±4.87项/g （w.w）。肉食性Buccinum unatum表现出最高的MP负荷，可能是由于生物放大。Spearman相关分析显示，MPs丰度与软体动物生物学性状呈负相关，表明个体越大，MPs浓度越低。纤维（52.63%）和小颗粒（<50 μm）（76.19%）占主导地位，聚乙烯是最常见的聚合物。聚合物危害指数（PHI）为2115，为高危险等级(V)。据估计，每年从食用软体动物中摄入的平均MP为24,680颗粒/人/年，这突出了潜在的健康问题。本研究为了解软体动物的MP污染及其潜在风险提供了重要数据。

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引用次数: 0

Behavioural and biochemical effects of underwater noise from vessel traffic on Baltic sea mussels (Mytilus spp.) 船舶噪声对波罗的海贻贝行为和生化的影响

IF 3.2 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2026-01-21 DOI: 10.1016/j.marenvres.2026.107870

Rami El-Dairi, Viivi Pöyhönen, Raisa Turja, Okko Outinen, Kari K. Lehtonen

Underwater noise is an emerging physical stressor in the Baltic Sea, where strong seasonality coincides with peaks in recreational boating and continuous commercial shipping. While behavioural effects of noise are increasingly reported for marine invertebrates, Baltic mussels (Mytilus spp.) remain untested, and links to cellular physiology are scarce. We conducted controlled laboratory exposures of pre-recorded vessel noise with variable exposure durations, and quantified behavioural and biochemical responses in Baltic mussels. Individual valve-gape behaviours were recorded before, during, and after exposure; in parallel, we measured a suite of neurotoxicity and antioxidant biomarkers, including acetylcholinesterase, catalase, glutathione reductase, reduced glutathione, glutathione S-transferase, lipid peroxidation and superoxide dismutase. Compared with control mussels, noise treatments elicited significant changes in valve-gape behaviour and altered biomarker profiles. Elevated closure activity was linked with higher LPO and shifts in antioxidant enzyme responses, suggesting short-term trade-offs between defence and energy acquisition. Our results provide the first evidence for concurrent behavioural and biochemical effects of vessel noise on mussels from the Baltic Sea, demonstrating that noise can cause changes in their energy dynamics. Our results suggest that mussel behaviour depends strongly on the duration of noise exposure, in addition to its frequency pattern and intensity.

在波罗的海，水下噪音是一种新兴的生理压力源，在这里，强烈的季节性与休闲划船和持续的商业航运的高峰相吻合。虽然噪音对海洋无脊椎动物的行为影响的报道越来越多，但波罗的海贻贝（Mytilus spp.）仍然未经测试，并且与细胞生理学的联系很少。我们对预先记录的不同暴露时间的船舶噪声进行了实验室暴露控制，并量化了波罗的海贻贝的行为和生化反应。在暴露前、暴露中和暴露后分别记录个体的阀门间隙行为；同时，我们测量了一套神经毒性和抗氧化生物标志物，包括乙酰胆碱酯酶、过氧化氢酶、谷胱甘肽还原酶、还原性谷胱甘肽、谷胱甘肽s -转移酶、脂质过氧化和超氧化物歧化酶。与对照贻贝相比，噪声处理引起了阀间隙行为和生物标志物谱的显著变化。较高的关闭活性与较高的LPO和抗氧化酶反应的变化有关，表明防御和能量获取之间的短期权衡。我们的研究结果为船舶噪音对波罗的海贻贝的行为和生化影响提供了第一个证据，表明噪音可以引起贻贝能量动力学的变化。我们的研究结果表明，贻贝的行为在很大程度上取决于噪音暴露的持续时间，以及噪音的频率模式和强度。

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引用次数: 0

Ocean acidification effects on growth, survival and physiological immunity of farmed Larimichthys crocea 海洋酸化对养殖鲈鱼生长、存活及生理免疫的影响

IF 3.2 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2026-01-20 DOI: 10.1016/j.marenvres.2026.107869

Xiaoyan Zhang , Feng Liu , Xiao Liang , Zhigang Xie , Guoer Shao , Ting Ye , Bao Lou

Ocean acidification has become a significant global ecological issue, particularly in coastal regions with intensive aquaculture. Fish farming is a crucial component of global food security, yet research on the impact of acidification on the aquaculture performance of economically important teleosts remains limited. In this study, we reared the fast-growing large yellow croaker (Larimichthys crocea) for 30 days under three different pH conditions: severe acidification (LA, pH 7.4), moderate acidification (MA, pH 7.8), and control (HA, pH 8.1). We comprehensively evaluated growth performance, survival rate, tissue structure, antioxidant enzyme activity, and innate immunity. The results showed that the LA group exhibited suppressed growth (significantly lower than the MA group, p < 0.05), elevated cortisol and T4 levels (p < 0.05), and trends of reduced antioxidant enzyme and innate immune enzyme activities, along with organ-specific pathological changes (vacuolation, structural loosening) in gills, liver, kidneys, and intestines, though most indices showed no significant difference from the HA group. Notably, the MA group showed optimal growth performance, stable physiological and immune responses. In conclusion, while acidification did not markedly affect the survival rate of L. crocea, severe acidification (pH 7.4) induces stress responses and tissue damage. These findings suggest that L. crocea exhibits a certain degree of tolerance to the acidification conditions tested, as several physiological parameters were not significantly affected. However, when considering the overall set of observations, including histological alterations across multiple tissues and changes in plasma and tissue parameters, long-term exposure to severe acidification (pH 7.4) appears to induce tissue damage and stress-related physiological disturbances, indicating potential health risks. This study provides empirical evidence regarding the potential risk posed by projected ocean acidification on L. crocea aquaculture and supports the development of climate change adaptation strategies for coastal mariculture.

海洋酸化已成为一个重大的全球生态问题，特别是在集约化水产养殖的沿海地区。鱼类养殖是全球粮食安全的重要组成部分，但关于酸化对具有重要经济意义的硬骨鱼水产养殖性能影响的研究仍然有限。本研究采用三种不同的pH条件：重度酸化（LA, pH 7.4）、中度酸化（MA, pH 7.8）和对照（HA, pH 8.1），饲养快速生长的大黄鱼（Larimichthys crocea） 30 d。我们综合评估了生长性能、存活率、组织结构、抗氧化酶活性和先天免疫。结果显示，LA组生长受到抑制（显著低于MA组，p < 0.05），皮质醇和T4水平升高（p < 0.05），抗氧化酶和先天免疫酶活性有降低的趋势，同时鳃、肝脏、肾脏和肠道的器官特异性病理改变（空泡化、结构松动），但大多数指标与HA组无显著差异。值得注意的是，MA组的生长性能最佳，生理和免疫反应稳定。综上所述，虽然酸化对罗非鱼的存活率没有显著影响，但严重酸化（pH 7.4）会引起应激反应和组织损伤。这些结果表明，乳杆菌对酸化条件具有一定的耐受性，因为一些生理参数没有受到显著影响。然而，考虑到整体观察结果，包括多个组织的组织学改变以及血浆和组织参数的变化，长期暴露于严重酸化（pH值7.4）似乎会诱导组织损伤和与应激相关的生理紊乱，表明潜在的健康风险。本研究为预测海洋酸化对沙鳅养殖业的潜在风险提供了经验证据，并为沿海海水养殖业气候变化适应策略的制定提供了支持。

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引用次数: 0

Combined contamination of OPEs and PAEs in coastal sediments: Distribution, sources, and ecological risks in Northern China's Marginal Seas 中国北方沿海沉积物中OPEs和PAEs的复合污染：分布、来源和生态风险

IF 3.2 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2026-01-19 DOI: 10.1016/j.marenvres.2026.107859

Bin Han , Li Zheng , Yinghui Liu

To address the gap in understanding the combined contamination characteristics, source contributions, and interactive ecological risks of OPEs and PAEs in semi-enclosed seas, this study presents a comparative analysis of 16 OPEs and 16 PAEs in 23 surface sediment samples from the Bohai and North Yellow Seas, China. Surface sediment samples were collected using a grab sampler, pretreated via freeze-drying, ASE, and SPE purification, and analyzed by GC/MS. Source apportionment was conducted using PCA and ecological risks were assessed via the RQ method. Concentrations of ΣOPEs and ΣPAEs ranged from 128.73 to 242.33 ng g⁻¹ and 1143.05–3541.88 ng g⁻¹ dry weight, respectively, with distinct pollution hotspots identified in Bohai Bay and Laizhou Bay. This ΣOPE level is comparable to that of other semi-enclosed bays in eastern China but significantly lower than the Yangtze River Estuary, while ΣPAEs are approximately one order of magnitude higher than ΣOPEs, consistent with their higher addition ratios in plastic products. PCA revealed that OPEs primarily originated from industrial production and traffic emissions, whereas PAEs were predominantly derived from plastic processing and atmospheric deposition. Ecological risk assessment using RQ indicated that OPEs posed negligible risks to aquatic organisms. In contrast, PAEs-specifically DIBP and DBP-presented moderate-to-high risks to fish, with DBP reaching a high-risk level (RQ ≥ 10) at 33 % of the sites in Laizhou Bay. This study is the first comprehensive assessment of combined OPE-PAE contamination in the Bohai and North Yellow Seas, clarifying structure-dependent environmental behavior and interactive ecological risks, and providing critical baseline data for targeted pollution control in semi-enclosed marine systems.

为了弥补对半封闭海中OPEs和PAEs的综合污染特征、来源贡献和交互生态风险的认识空白，本研究对渤海和北黄海23个表层沉积物样品中的16种OPEs和16种PAEs进行了比较分析。表层沉积物样品采用抓取式取样器采集，经冷冻干燥、ASE和SPE净化预处理，并进行GC/MS分析。采用主成分分析法进行污染源分析，采用RQ法进行生态风险评价。ΣOPEs和ΣPAEs的浓度分别为128.73 ~ 242.33 ng g−1和1143.05 ~ 3541.88 ng g−1干重，在渤海湾和莱州湾有明显的污染热点。该ΣOPE水平与中国东部其他半封闭海湾相当，但明显低于长江口，而ΣPAEs比ΣOPEs高约一个数量级，这与它们在塑料制品中的添加率较高一致。主成分分析表明，OPEs主要来源于工业生产和交通排放，PAEs主要来源于塑料加工和大气沉积。利用RQ进行的生态风险评估表明，有机磷农药对水生生物的风险可以忽略不计。相比之下，paes（特别是DIBP和DBP）对鱼类具有中至高风险，其中DBP在莱州湾33%的站点达到高风险水平（RQ≥10）。本研究首次对渤海和北黄海OPE-PAE复合污染进行了综合评价，阐明了结构依赖的环境行为和相互作用的生态风险，为半封闭海洋系统的定向污染控制提供了关键的基线数据。

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引用次数: 0

Multi-pathway nutrient replenishment mechanisms sustaining the transboundary green tides region in the Southern Yellow sea 南黄海跨界绿潮区多通道养分补给机制的维持

IF 3.2 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2026-01-18 DOI: 10.1016/j.marenvres.2026.107865

Xin Li , Hong Gao , Chuansong Zhang , Xiaoyong Shi

Large-scale macroalgal blooms represent a critical environmental challenge for coastal regions worldwide, driven primarily by human-induced eutrophication. Since 2007, the Southern Yellow Sea (SYS) in China has experienced massive green tides of Ulva prolifera (U.prolifera) each summer, persistently impacting the coastal economies, ecosystems, and social well-being of Jiangsu and Shandong provinces. This study systematically quantified the contribution of different nutrient sources to the migration path of green tide in the outbreak area. The analysis was mainly based on field monitoring data from 2017, supplemented by historical datasets. Results show that atmospheric deposition acts as a key cross-regional driver, accounting for 70 %, 34 %, 54 %, 76 %, and 64 % of dissolved inorganic nitrogen (DIN), dissolved inorganic phosphorus (DIP), dissolved silicon (DSi), dissolved organic nitrogen (DON), and dissolved organic phosphorus (DOP), respectively. Meanwhile, terrestrial inputs in the Subei Shoal—including river input and marine aquaculture—provide 25 % of DIN and 46 % of DIP, forming an essential nutrient base for the initial bloom development. As algal biomass drifted northward to the coastal waters of Shandong Peninsula, continuous atmospheric nutrient deposition became a key driver for the expansion of the green tide. This study quantitatively elucidates the transboundary effects of atmospheric and terrestrial nutrient inputs, offering scientific support for nutrient management strategies in coastal marine systems.

大规模的大型藻华是全球沿海地区面临的严峻环境挑战，主要由人类引起的富营养化驱动。自2007年以来，中国南黄海（SYS）每年夏季都会出现大规模的藻绿潮，持续影响着江苏和山东沿海的经济、生态系统和社会福祉。本研究系统量化了不同营养源对暴发区绿潮迁移路径的贡献。分析主要基于2017年的现场监测数据，并辅以历史数据集。结果表明，大气沉降是主要的跨区域驱动因素，分别占溶解无机氮（DIN）、溶解无机磷（DIP）、溶解硅（DSi）、溶解有机氮（DON）和溶解有机磷（DOP）的70%、34%、54%、76%和64%。同时，苏北浅滩的陆源输入（包括河流输入和海洋养殖）提供了25%的DIN和46%的DIP，形成了初始水华发展所必需的营养基础。随着藻生物量向北漂移至山东半岛近岸水域，持续的大气营养物沉积成为绿潮扩展的关键驱动力。本研究定量阐明了大气和陆地养分输入的跨界效应，为沿海海洋系统的养分管理策略提供了科学支持。

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引用次数: 0

Spatial richness patterns of large pelagic fishes in the Eastern Pacific Ocean 东太平洋大型中上层鱼类的空间丰富度格局

IF 3.2 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2026-01-18 DOI: 10.1016/j.marenvres.2026.107860

Aura Buenfil-Ávila , Sofia Ortega-García , Héctor Villalobos , Javier Nori , Ulianov Jakes-Cota , Rodrigo Moncayo-Estrada , Gabriel Reygondeau

In the Eastern Pacific Ocean, the purse seine tuna fishery targets skipjack, yellowfin tuna, and bigeye tuna. However, bycatch of billfish is also common. Growing concerns about the rising bycatch levels and the capture of juveniles’ tunas underscore the need for spatial explicit management strategies. This study aims to model the geographic distributions of four tuna species (skipjack, yellowfin, bigeye, and black skipjack) and five billfish species (swordfish, sailfish, striped marlin, blue marlin, and black marlin) to understand how interannual variability shapes richness patterns of these species to inform spatial management efforts. Species distribution models were developed using MaxEnt based on environmental scenarios representing cold, neutral, and warm conditions from 2000 to 2020. A database of occurrences was compiled from Inter-American Tropical Tuna Commission's, while environmental variables were obtained from Copernicus Marine Service. Predicted distribution maps for each species were combined to generate species richness maps under different environmental scenarios. Areas of high species richness were identified near the Baja California peninsula, the southern Gulf of California, off the coast of Central America, and between the Ecuadorian coast and the Galapagos Islands, regions that overlap with known spawning and feeding grounds. Species richness patterns showed an interannual variability, expanding during warm periods and contracting during neutral and cold conditions, highlighting the need to adapt spatial management to environmental variability of oceans. These findings provide a basis for future spatial planning and conservation initiatives, highlighting the need for dynamic, flexible conservation strategies that can adapt to a changing ocean.

在东太平洋，围网金枪鱼渔业的目标是鲣鱼、黄鳍金枪鱼和大眼金枪鱼。然而，副捕获长嘴鱼也很常见。越来越多的人担心副渔获量的增加和金枪鱼幼鱼的捕获，这强调了制定明确的空间管理策略的必要性。本研究旨在模拟四种金枪鱼（鲣鱼、黄鳍鱼、大眼鱼和黑鲣）和五种长嘴鱼（旗鱼、旗鱼、条纹马林鱼、蓝马林鱼和黑马林鱼）的地理分布，以了解年际变化如何影响这些物种的丰富度模式，为空间管理工作提供信息。利用MaxEnt软件建立了2000 - 2020年寒、中、暖环境情景下的物种分布模型。美洲热带金枪鱼委员会编制了一个事件数据库，而哥白尼海洋服务处则获得了环境变量。将各物种预测分布图进行组合，生成不同环境情景下的物种丰富度分布图。物种丰富度高的地区被确定在加利福尼亚半岛附近，加利福尼亚湾南部，中美洲海岸，厄瓜多尔海岸和加拉帕戈斯群岛之间，这些地区与已知的产卵和觅食地重叠。物种丰富度格局呈现年际变化，在温暖期扩大，在中性和寒冷期缩小，突出了海洋空间管理适应环境变化的必要性。这些发现为未来的空间规划和保护举措提供了基础，强调了动态、灵活的保护策略的必要性，以适应不断变化的海洋。

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引用次数: 0

Nickel and cobalt disrupt the microbiome and metabolic function of the photosymbiotic sea slug Berghia stephanieae (Á. Valdés, 2005) 镍和钴会破坏光共生海蛞蝓（Berghia stephanieae）的微生物群和代谢功能（Á）。巴尔德斯,2005)

IF 3.2 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2026-01-17 DOI: 10.1016/j.marenvres.2026.107845

Corinna Sickinger , Alicia Thiel , Julia Bornhorst , Gregor Christa , Angelika Preisfeld

The rapid global expansion of electromobility has increased demand for nickel and cobalt, which are key components in lithium-ion batteries. As a result, mining activities are intensifying, yet their ecological impact on marine ecosystems remains poorly understood. In this study, we examine the effects of nickel and cobalt on the microbiome composition and bacterial metabolic pathways of the marine photosymbiotic gastropod Berghia stephanieae. Preliminary toxicity tests showed concentration-dependent metal uptake, with behavioural stress responses such as lethargy, cessation of feeding, and shedding of cerata occurring at high concentrations (around 18 mg/L for nickel and cobalt). Microbiome analysis across three concentrations (1, 3, and 17 mg/L for nickel and cobalt) revealed significant changes in community composition and function. At 1 mg/L, the observed effects were concentration-dependent rather than metal-specific, as indicated by a decline in alpha diversity and a shift in community composition, characterised by a reduction in Mycoplasma sp. and an increase in Pseudofulvibacter and Endozoicomonas sp. At 3 mg/L, Shewanella spp. abundance increased and metal-specific effects emerged, with a strong downregulation of the metabolic pathways denitrification and lignin degradation for cobalt and an upregulation of sulfur oxidation for nickel. At 17 mg/L, many functional pathways were downregulated, aligning with observed host stress and pointing to a possible loss of functional redundancy. Overall, nickel and cobalt exposure led to distinct microbiome alterations, with intermediate levels eliciting the strongest metabolic response.

全球电动汽车的快速扩张增加了对镍和钴的需求，这是锂离子电池的关键成分。因此，采矿活动正在加剧，但其对海洋生态系统的生态影响仍然知之甚少。在这项研究中，我们研究了镍和钴对海洋光共生腹足动物伯格氏菌（Berghia stephanieae）微生物组组成和细菌代谢途径的影响。初步毒性试验显示，高浓度（镍和钴约为18毫克/升）的金属摄取与浓度有关，并伴有嗜睡、停止进食和脱落角状细胞等行为应激反应。三种浓度（镍和钴分别为1、3和17 mg/L）的微生物组分析显示，群落组成和功能发生了显著变化。当浓度为1 mg/L时，观察到的效应是浓度依赖性的，而不是金属特异性的，正如α多样性下降和群落组成的变化所表明的那样，其特征是支原体减少，假fulvibacter和Endozoicomonas sp.增加。当浓度为3 mg/L时，Shewanella sp.丰度增加，并出现金属特异性效应。对钴的反硝化和木质素降解代谢途径有强烈的下调，对镍的硫氧化有强烈的上调。在17 mg/L时，许多功能通路下调，与观察到的宿主应激一致，并指出可能失去功能冗余。总体而言，镍和钴暴露导致不同的微生物组改变，中等水平引起最强的代谢反应。

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引用次数: 0

Host species as key drivers of Symbiodiniaceae assemblages: Coral and free-living diversity in a Southwestern Atlantic oceanic island 寄主物种作为共生体科组合的关键驱动因素：西南大西洋岛屿上的珊瑚和自由生物多样性

IF 3.2 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2026-01-17 DOI: 10.1016/j.marenvres.2025.107829

Camila Rodrigues Lima , Amana Guedes Garrido , Barbara Morim , Deborah Catharine de Assis Leite , Carla Zilberberg

Symbiodiniaceae is a diverse family of photosymbiont dinoflagellates known for forming mutualistic associations with reef-building corals and other marine invertebrates. This family comprises a diverse array of lineages with distinct physiological traits, enabling hosts to exhibit differential responses to environmental stressors. In addition to their endosymbiotic forms, Symbiodiniaceae also occur as free-living cells, potentially acting as environmental reservoirs that facilitate coral recolonization following bleaching events. This study provides the first comprehensive characterization of Symbiodiniaceae assemblages, examining both endosymbiotic and free-living assemblages across three reef sites using ITS2 rDNA next-generation sequencing at Fernando de Noronha archipelago (SWA). Sequences primarily belonged to the genera Symbiodinium, Breviolum and Cladocopium across all reef compartments. Both coral hosts and Symbiodiniaceae ITS 2 types exhibited generalist traits, with multiple associations observed. Endosymbiotic community structure was strongly host-driven, with most coral species dominated by a single ITS2 type, indicating high partner fidelity. Free-living assemblage (seawater and sediment) displayed greater diversity and a more even community composition compared to endosymbionts. A limited overlap was detected between coral-associated and environmental ITS2 sequences, suggesting restricted exchange but potential environmental reservoirs for dominant types. Our work reinforce that the corals hosts are the primary drivers of Symbiodiniaceae community structure in this oceanic island ecosystem. This research provide an essential baseline data for understanding coral–symbiont dynamics in the Southwestern Atlantic, particularly in face of global climate changes.

共生藻科是一个不同的光共生鞭毛藻家族，以与造礁珊瑚和其他海洋无脊椎动物形成共生关系而闻名。这个家族包括一系列具有不同生理特征的谱系，使寄主对环境压力表现出不同的反应。除了它们的内共生形式，共生菌科也以自由活细胞的形式出现，潜在地作为环境水库，促进珊瑚在白化事件后重新定植。本研究首次全面表征了共生体科（symbiodiiaceae）的组合，利用ITS2 rDNA新一代测序技术在费尔南多迪诺罗尼亚群岛（SWA）的三个珊瑚礁遗址中检测了内共生和自由生活的组合。所有礁室的序列主要属于共生属、Breviolum属和Cladocopium属。珊瑚寄主和共生体科ITS 2型寄主均表现出通才特征，存在多重关联。内共生群落结构强烈受宿主驱动，大多数珊瑚物种由单一ITS2型主导，表明伴侣保真度高。与内共生生物相比，自由生活组合（海水和沉积物）表现出更大的多样性和更均匀的群落组成。珊瑚相关ITS2序列和环境ITS2序列之间存在有限的重叠，表明交换有限，但优势类型具有潜在的环境储集层。我们的研究表明，珊瑚宿主是这个海洋岛屿生态系统共生科群落结构的主要驱动力。这项研究为了解西南大西洋珊瑚共生动态提供了重要的基线数据，特别是在面对全球气候变化的情况下。

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引用次数: 0

In-situ experimental evidence revealing how ocean warming promotes Aurelia coerulea polyps mediated by benthic ecosystem change 原位实验证据揭示海洋变暖如何促进底栖生态系统变化介导的蓝纹水螅。

IF 3.2 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2026-01-17 DOI: 10.1016/j.marenvres.2026.107853

Wenxiao Zang , Yong Xu , Fang Zhang , Song Sun

Harmful jellyfish blooms are widely believed to be associated with global warming; however, direct in-situ evidence at an ecosystem level to explain bloom mechanisms is lacking. This study focused on Aurelia coerulea polyps and the local benthic ecosystem and applied field temperature manipulation to explore responses of polyps and benthic ecosystems to global warming, community changes, and polyp survival strategies. In our experiment, local heating (+1.5 °C and +3 °C) led to significant changes in benthic community structure (p < 0.001), a decline in biodiversity, and the proliferation of opportunistic dominant organisms. Aurelia coerulea polyps achieved remarkable expansion, with their coverage percentage reaching 79.73 % in the +3 °C group at the final sampling, significantly higher than the 53.30 % at ambient temperature. During the transition of the benthic ecosystem from stability to instability, jellyfish polyps expanded colonization by virtue of diversified asexual reproduction modes such as budding, longitudinal fission, stolonic budding, which were enhanced under warming, and their rapid responses to environmental change and strong adaptability to warming environments. Our study revealed direct effects on organisms and indirect effects mediated by ecosystems of global warming in the process of jellyfish polyp blooms and emphasized the importance of considering the comprehensive effect of global warming at the local benthic ecosystem level through in-situ experiments when explaining the proliferation of opportunistic and hazardous species with complex life cycles such as jellyfish.

有害的水母大量繁殖被广泛认为与全球变暖有关；然而，在生态系统水平上解释水华机制的直接原位证据缺乏。本研究以蓝纹水螅和当地底栖生态系统为研究对象，应用野外温度调控技术探讨了全球变暖、群落变化和水螅生存策略对水螅和底栖生态系统的响应。在我们的实验中，局部加热（+1.5°C和+3°C）导致底栖生物群落结构的显著变化(p

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引用次数: 0