Marine environmental research最新文献_第4页

Life cycle assessment of diploid and triploid oyster farming: A case study in Zhanjiang, China 二倍体和三倍体牡蛎养殖生命周期评价——以湛江地区为例

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

Marine environmental research

Pub Date : 2026-04-01 Epub Date: 2026-02-08 DOI: 10.1016/j.marenvres.2026.107901

Hui Zhao , Weixiong Bu , Kai Tian , Liqiang Zhao , Chuangye Yang , Jiangna Yang , Liwei Sun

Growing pressure to mitigate the environmental impacts of food production systems has made the development of sustainable protein sources a priority at the global level. Oyster farming constitutes a pivotal component of the blue food system, yet, in China, the environmental impacts of this sector remain poorly characterized, primarily because of highly diversified farming practices and pronounced regional heterogeneity across the tropical coastal waters of the south. To fill the information gap, this study performed a “cradle to gate” life cycle assessment for two commercially dominant taxa farmed in the Zhanjiang region: the native Crassostrea hongkongensis and the introduced triploid Crassostrea angulata. Through field research on seven farming models, the study found that the carbon footprint of triploid C. angulata (89.04∼105.18 kg CO₂-eq t⁻¹) was lower than that of C. hongkongensis (133.85∼178.85 kg CO₂-eq t⁻¹). In terms of environmental impacts, polyurethane foam floats in C. hongkongensis farming were the primary source of greenhouse gas (GHG) emissions (contributing 51.61%), freshwater eutrophication, marine eutrophication and water consumption, whereas the environmental impacts of triploid C. angulata were mainly driven by the seedling stage, diesel consumption, and float ball. Furthermore, on 1 kg protein basis, the GHG emissions of both oyster types (2.67∼9.00 kg CO₂-eq kg⁻¹) were significantly lower than those of traditional animal products such as beef and pork. Scenario analysis demonstrates that through the adoption of recycled plastic float barrels, extension of facility service life, and optimization of attachment substrates, the following maximum reduction potentials can be achieved across different environmental impact categories: 31.57% for global warming, 26.27% for terrestrial acidification, 58.72% for freshwater eutrophication, 95.05% for marine eutrophication, 6.07% for land use, and 65.99% for water consumption. These findings corroborate that C. hongkongensis and triploid C. angulata farming in the Zhanjiang coastal system constitutes a premium low environmental impacts protein source and can make a material contribution to low-carbon blue food production.

减轻粮食生产系统对环境影响的压力越来越大，这使得开发可持续蛋白质来源成为全球一级的优先事项。牡蛎养殖是蓝色食品系统的关键组成部分，然而，在中国，这一部门的环境影响特征仍然很差，主要是因为高度多样化的养殖方式和南方热带沿海水域明显的区域异质性。为了填补这一信息空白，本研究对湛江地区两种具有商业优势的分类群——香港长牡蛎（Crassostrea hongkongensis）和引进的三倍体角长牡蛎（Crassostrea angulata）进行了“从摇篮到大门”的生命周期评估。通过对7种养殖模式的实地考察，研究发现三倍体角田鸡的碳足迹（89.04 ~ 105.18 kg CO2-eq t-1）低于香港田鸡（133.85 ~ 178.85 kg CO2-eq t-1）。在环境影响方面，聚氨酯泡沫浮子是香港刺参养殖温室气体（GHG）排放（占51.61%）、淡水富营养化、海洋富营养化和耗水量的主要来源，而三倍体刺参的环境影响主要由苗期、柴油消耗和浮球驱动。此外，在1千克蛋白质的基础上，两种牡蛎的温室气体排放量（2.67 ~ 9.00千克二氧化碳当量kg-1）显著低于牛肉和猪肉等传统动物产品。情景分析表明，通过采用再生塑料浮桶、延长设施使用寿命和优化附着基质，不同环境影响类别的最大减排潜力分别为：全球变暖减排潜力31.57%、陆地酸化减排潜力26.27%、淡水富营养化减排潜力58.72%、海洋富营养化减排潜力95.05%、土地利用减排潜力6.07%、用水量减排潜力65.99%。上述研究结果证实，湛江沿海系统养殖的香港c.c honggensis和三倍体c.c angulata是一种优质的低环境影响蛋白质来源，可以为低碳蓝色食品生产做出物质贡献。

{"title":"Life cycle assessment of diploid and triploid oyster farming: A case study in Zhanjiang, China","authors":"Hui Zhao , Weixiong Bu , Kai Tian , Liqiang Zhao , Chuangye Yang , Jiangna Yang , Liwei Sun","doi":"10.1016/j.marenvres.2026.107901","DOIUrl":"10.1016/j.marenvres.2026.107901","url":null,"abstract":"<div><div>Growing pressure to mitigate the environmental impacts of food production systems has made the development of sustainable protein sources a priority at the global level. Oyster farming constitutes a pivotal component of the blue food system, yet, in China, the environmental impacts of this sector remain poorly characterized, primarily because of highly diversified farming practices and pronounced regional heterogeneity across the tropical coastal waters of the south. To fill the information gap, this study performed a “cradle to gate” life cycle assessment for two commercially dominant taxa farmed in the Zhanjiang region: the native <em>Crassostrea hongkongensis</em> and the introduced triploid <em>Crassostrea angulata</em>. Through field research on seven farming models, the study found that the carbon footprint of triploid <em>C. angulata</em> (89.04∼105.18 kg CO<sub>2</sub>-eq t<sup>−1</sup>) was lower than that of <em>C. hongkongensis</em> (133.85∼178.85 kg CO<sub>2</sub>-eq t<sup>−1</sup>). In terms of environmental impacts, polyurethane foam floats in <em>C. hongkongensis</em> farming were the primary source of greenhouse gas (GHG) emissions (contributing 51.61%), freshwater eutrophication, marine eutrophication and water consumption, whereas the environmental impacts of triploid <em>C. angulata</em> were mainly driven by the seedling stage, diesel consumption, and float ball. Furthermore, on 1 kg protein basis, the GHG emissions of both oyster types (2.67∼9.00 kg CO<sub>2</sub>-eq kg<sup>−1</sup>) were significantly lower than those of traditional animal products such as beef and pork. Scenario analysis demonstrates that through the adoption of recycled plastic float barrels, extension of facility service life, and optimization of attachment substrates, the following maximum reduction potentials can be achieved across different environmental impact categories: 31.57% for global warming, 26.27% for terrestrial acidification, 58.72% for freshwater eutrophication, 95.05% for marine eutrophication, 6.07% for land use, and 65.99% for water consumption. These findings corroborate that <em>C. hongkongensis</em> and triploid <em>C. angulata</em> farming in the Zhanjiang coastal system constitutes a premium low environmental impacts protein source and can make a material contribution to low-carbon blue food production.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"216 ","pages":"Article 107901"},"PeriodicalIF":3.2,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146165970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electromagnetic fields from submarine power cables: A 35 Year synthesis of effects on aquatic biota 海底电力电缆产生的电磁场：35年来对水生生物群的综合影响

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

Marine environmental research

Pub Date : 2026-04-01 Epub Date: 2026-02-09 DOI: 10.1016/j.marenvres.2026.107916

Elizabeth James , Mojtaba Ghodsi , Alex T. Ford

Submarine power cables (SPCs) associated with offshore renewable energy developments emit electromagnetic fields (EMFs) that can influence aquatic biota. Although research on this topic has increased, a comprehensive, systematic synthesis of observed effects across taxa and life stages, and biological contexts has been lacking. Following PRISMA 2020 guidelines (PROSPERO ID: 1138188), we systematically reviewed peer-reviewed and grey literature published between 1990 and 2024. Of 1637 records screened, 67 eligible field and laboratory studies were included. Significant behavioural and physiological responses to EMF exposure were reported in 66% of studies, with early life stages (embryos, larvae, juveniles) and magnetosensitive taxa, particularly fishes and crustaceans being most frequently affected. Effects occurred even at environmentally relevant intensities (<250 μT). Laboratory experiments more frequently detected effects than field studies, which were generally fewer, shorter in duration, and methodologically heterogeneous. Sensitivity heatmaps identified developmental stages and freshwater species as particularly sensitive, with notable taxonomic disparities. EMFs from SPCs can elicit ecologically relevant responses in aquatic biota, particularly during sensitive developmental windows and in magnetically responsive taxa. Emerging evidence further indicates that sex specific responses represent an important and previously under recognised dimension of EMF sensitivity. However, major uncertainties persist regarding chronic, population and ecosystem level impacts. Future research should prioritise standardisation of exposure characterisation and reporting, routine inclusion of sex and life stage as biological variables and coordinated laboratory to field validation. Integrating EMF considerations into marine spatial planning, environmental regulation, and biodiversity conservation frameworks will be essential to support proportionate ecological risk assessment and management of offshore renewable energy infrastructure.

与海上可再生能源开发相关的海底电力电缆（spc）会发射电磁场（emf），影响水生生物群。尽管对这一主题的研究有所增加，但对观察到的跨分类群、生命阶段和生物学背景的影响的全面、系统的综合一直缺乏。根据PRISMA 2020指南（PROSPERO ID: 1138188），我们系统地审查了1990年至2024年间发表的同行评审和灰色文献。在筛选的1637份记录中，包括67份符合条件的现场和实验室研究。66%的研究报告了对电磁场暴露的显著行为和生理反应，早期生命阶段（胚胎、幼虫、幼鱼）和磁敏感分类群，特别是鱼类和甲壳类动物最常受到影响。即使在环境相关强度（<250 μT）下也会产生影响。与实地研究相比，实验室实验更容易发现影响，实地研究通常较少，持续时间较短，方法上也不相同。敏感性热图显示发育阶段和淡水物种特别敏感，分类差异显著。来自SPCs的电磁场可以引起水生生物群的生态相关反应，特别是在敏感的发育窗口和对磁敏感的分类群中。新出现的证据进一步表明，性别特异性反应代表了一个重要的、以前未被认识到的EMF敏感性维度。然而，在慢性、人口和生态系统层面的影响方面，主要的不确定性仍然存在。未来的研究应优先考虑暴露特征和报告的标准化，将性别和生命阶段作为生物学变量常规纳入，并协调实验室到现场的验证。将EMF考虑纳入海洋空间规划、环境监管和生物多样性保护框架，对于支持海上可再生能源基础设施的生态风险评估和管理至关重要。

{"title":"Electromagnetic fields from submarine power cables: A 35 Year synthesis of effects on aquatic biota","authors":"Elizabeth James , Mojtaba Ghodsi , Alex T. Ford","doi":"10.1016/j.marenvres.2026.107916","DOIUrl":"10.1016/j.marenvres.2026.107916","url":null,"abstract":"<div><div>Submarine power cables (SPCs) associated with offshore renewable energy developments emit electromagnetic fields (EMFs) that can influence aquatic biota. Although research on this topic has increased, a comprehensive, systematic synthesis of observed effects across taxa and life stages, and biological contexts has been lacking. Following PRISMA 2020 guidelines (PROSPERO ID: 1138188), we systematically reviewed peer-reviewed and grey literature published between 1990 and 2024. Of 1637 records screened, 67 eligible field and laboratory studies were included. Significant behavioural and physiological responses to EMF exposure were reported in 66% of studies, with early life stages (embryos, larvae, juveniles) and magnetosensitive taxa, particularly fishes and crustaceans being most frequently affected. Effects occurred even at environmentally relevant intensities (<250 μT). Laboratory experiments more frequently detected effects than field studies, which were generally fewer, shorter in duration, and methodologically heterogeneous. Sensitivity heatmaps identified developmental stages and freshwater species as particularly sensitive, with notable taxonomic disparities. EMFs from SPCs can elicit ecologically relevant responses in aquatic biota, particularly during sensitive developmental windows and in magnetically responsive taxa. Emerging evidence further indicates that sex specific responses represent an important and previously under recognised dimension of EMF sensitivity. However, major uncertainties persist regarding chronic, population and ecosystem level impacts. Future research should prioritise standardisation of exposure characterisation and reporting, routine inclusion of sex and life stage as biological variables and coordinated laboratory to field validation. Integrating EMF considerations into marine spatial planning, environmental regulation, and biodiversity conservation frameworks will be essential to support proportionate ecological risk assessment and management of offshore renewable energy infrastructure.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"216 ","pages":"Article 107916"},"PeriodicalIF":3.2,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Genomic resilience to sequential environmental perturbations in two sympatric costal fish species 两种同域沿海鱼类对连续环境扰动的基因组恢复力

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

Marine environmental research

Pub Date : 2026-04-01 Epub Date: 2026-01-28 DOI: 10.1016/j.marenvres.2026.107893

Maribet Gamboa , Florence Tellier , Constanza Millán-Medina , Diego Silva , Eduardo Hernández-Miranda

Natural disasters impose acute environmental stressors that can drastically reshape marine populations. Abrupt changes in habitat, resulting from hypoxia due to upwelling and seismic-induced tsunamis, are known chronic events, but their effects on marine taxa are poorly studied. This study investigates the genomic and mitochondrial responses of two coastal fish species, Aphos porosus and Normanichthys crockeri, to two sequential disturbances: a hypoxic upwelling event in 2008 and a seismic-induced tsunami in 2010 in Coliumo Bay, Chile. Whole-genome and mitochondrial DNA analyses may reveal strong genetic differentiation and reduced genetic diversity in N. crockeri, indicating a demographic bottleneck and adaptive shifts. While A. porosus could exhibited genomic resilience, likely due to parental care and sex-biased dispersal, with moderate mitochondrial divergence and increased matrilineal diversity post-disturbance. Functional annotations highlighted possible signatures of stress response, metabolic adaptation, and mitochondrial plasticity. These findings may underscore the complex interplay of ecological traits, environmental stressors, and genetic mechanisms driving population resilience and structuring in marine systems.

自然灾害造成了严重的环境压力，可以极大地重塑海洋种群。由于上升流和地震引起的海啸引起的缺氧导致栖息地的突然变化是已知的慢性事件，但它们对海洋分类群的影响研究很少。本研究调查了两种沿海鱼类，Aphos porosus和Normanichthys crockeri对两个连续干扰的基因组和线粒体反应：2008年缺氧上升流事件和2010年智利Coliumo湾地震引发的海啸。全基因组和线粒体DNA分析可能揭示出克罗克氏北蝽强烈的遗传分化和减少的遗传多样性，表明种群瓶颈和适应性转变。然而，由于亲代抚育和性别偏倚的分散，棘豆可能表现出基因组弹性，线粒体分化适度，干扰后母系多样性增加。功能注释突出了应激反应、代谢适应和线粒体可塑性的可能特征。这些发现可能强调了生态特征、环境压力源和遗传机制之间复杂的相互作用，这些因素推动了海洋系统中种群的恢复力和结构。

{"title":"Genomic resilience to sequential environmental perturbations in two sympatric costal fish species","authors":"Maribet Gamboa , Florence Tellier , Constanza Millán-Medina , Diego Silva , Eduardo Hernández-Miranda","doi":"10.1016/j.marenvres.2026.107893","DOIUrl":"10.1016/j.marenvres.2026.107893","url":null,"abstract":"<div><div>Natural disasters impose acute environmental stressors that can drastically reshape marine populations. Abrupt changes in habitat, resulting from hypoxia due to upwelling and seismic-induced tsunamis, are known chronic events, but their effects on marine taxa are poorly studied. This study investigates the genomic and mitochondrial responses of two coastal fish species, <em>Aphos porosus</em> and <em>Normanichthys crockeri</em>, to two sequential disturbances: a hypoxic upwelling event in 2008 and a seismic-induced tsunami in 2010 in Coliumo Bay, Chile. Whole-genome and mitochondrial DNA analyses may reveal strong genetic differentiation and reduced genetic diversity in <em>N. crockeri</em>, indicating a demographic bottleneck and adaptive shifts. While <em>A. porosus</em> could exhibited genomic resilience, likely due to parental care and sex-biased dispersal, with moderate mitochondrial divergence and increased matrilineal diversity post-disturbance. Functional annotations highlighted possible signatures of stress response, metabolic adaptation, and mitochondrial plasticity. These findings may underscore the complex interplay of ecological traits, environmental stressors, and genetic mechanisms driving population resilience and structuring in marine systems.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"216 ","pages":"Article 107893"},"PeriodicalIF":3.2,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146080430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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 : 2026-04-01 Epub 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。

{"title":"Nickel and cobalt disrupt the microbiome and metabolic function of the photosymbiotic sea slug Berghia stephanieae (Á. Valdés, 2005)","authors":"Corinna Sickinger , Alicia Thiel , Julia Bornhorst , Gregor Christa , Angelika Preisfeld","doi":"10.1016/j.marenvres.2026.107845","DOIUrl":"10.1016/j.marenvres.2026.107845","url":null,"abstract":"<div><div>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 <em>Berghia stephanieae</em>. 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 <em>Mycoplasma</em> sp. and an increase in Pseudofulvibacter and <em>Endozoicomonas</em> sp. At 3 mg/L, <em>Shewanella</em> 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.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"216 ","pages":"Article 107845"},"PeriodicalIF":3.2,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146006819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Membrane fingerprints and morphotype shifts in Phaeodactylum tricornutum co-exposed to cadmium and PBAT macroplastics as ecotoxicological indicators 三角褐指藻（Phaeodactylum tricornutum）共暴露于镉和PBAT巨塑的膜指纹图谱和形态变化作为生态毒理学指标

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

Marine environmental research

Pub Date : 2026-04-01 Epub Date: 2026-01-29 DOI: 10.1016/j.marenvres.2026.107890

Oumaima Salhi , Bernard Lasserre , Adélaïde Le Grand , Philippe Douzenel , Mikaël Kedzierski , Anthony Magueresse , Monia Trabelsi , Lazhar Mhadhbi , Olivier Sire , Véronique Le Tilly

This study investigates the individual and combined effects of cadmium (Cd²⁺) and poly (butylene adipate-co-terephthalate) (PBAT), a biodegradable macroplastic, on the marine diatom Phaeodactylum tricornutum (P. tricornutum). Interestingly, co-exposure with PBAT mitigates Cd²⁺ toxicity, except at high Cd²⁺ concentrations. Using a non-invasive Fourier-transform infrared (FTIR) spectroscopy protocol with robust acquisition parameters and principal component analysis, specific biochemical changes in membrane composition were monitored, with notable decreases in carbohydrate and lipid contents, while protein levels remained unaltered. Morphological observations revealed a shift toward the oval morphotype under exposure to Cd²⁺ and PBAT, alone and in combination, featuring a stress response. Additionally, the light-harvesting pigments, chlorophyll-a and fucoxanthin, increased in a dose-dependent manner upon Cd²⁺ exposure, while no significant β-carotene changes were observed, except at high Cd²⁺ concentrations in the presence of PBAT. This effect is further amplified under co-exposure conditions, the presence of PBAT leading to a marked increase in all three pigments, β-carotene included. The experimental protocol, which involved the aging of PBAT macroplastics in seawater for a short period, suggests that the degradation products of PBAT themselves are responsible for these observed biological effects. It is worth noting that morphotype shifts occur at lower Cd²⁺ concentrations than those affecting photosynthesis and photoprotective systems. These findings highlight the potential of P. tricornutum membrane fingerprints and morphotype shifts as sensitive ecotoxicological indicators of metal and plastic pollution, particularly in relation to degradation by-products in marine environments.

本文研究了镉（Cd2+）和可生物降解巨塑料聚己二酸丁二酯（PBAT）对海洋硅藻三角藻（P. tricornutum）的单独和联合作用。有趣的是，除了高Cd2+浓度外，与PBAT共暴露可减轻Cd2+毒性。采用具有鲁棒采集参数和主成分分析的非侵入性傅里叶变换红外（FTIR）光谱协议，监测膜组成的特定生化变化，碳水化合物和脂质含量显著降低，而蛋白质水平保持不变。形态学观察显示，在Cd2+和PBAT单独或联合作用下，细胞向椭圆形形态转变，具有应激反应。此外，捕光色素叶绿素-a和岩藻黄质在Cd2+暴露下呈剂量依赖性增加，而β-胡萝卜素没有显著变化，除非在PBAT存在的高Cd2+浓度下。这种效应在共暴露条件下被进一步放大，PBAT的存在导致所有三种色素（包括β-胡萝卜素）的显著增加。该实验方案涉及PBAT宏观塑料在海水中的短时间老化，表明PBAT的降解产物本身是这些观察到的生物效应的原因。值得注意的是，与影响光合作用和光保护系统的Cd2+浓度相比，形态变化发生在较低的Cd2+浓度下。这些发现突出了三角藻膜指纹图谱和形态变化作为金属和塑料污染的敏感生态毒理学指标的潜力，特别是与海洋环境中降解副产物有关。

{"title":"Membrane fingerprints and morphotype shifts in Phaeodactylum tricornutum co-exposed to cadmium and PBAT macroplastics as ecotoxicological indicators","authors":"Oumaima Salhi , Bernard Lasserre , Adélaïde Le Grand , Philippe Douzenel , Mikaël Kedzierski , Anthony Magueresse , Monia Trabelsi , Lazhar Mhadhbi , Olivier Sire , Véronique Le Tilly","doi":"10.1016/j.marenvres.2026.107890","DOIUrl":"10.1016/j.marenvres.2026.107890","url":null,"abstract":"<div><div>This study investigates the individual and combined effects of cadmium (Cd<sup>2+</sup>) and poly (butylene adipate-co-terephthalate) (PBAT), a biodegradable macroplastic, on the marine diatom <em>Phaeodactylum tricornutum (P. tricornutum)</em>. Interestingly, co-exposure with PBAT mitigates Cd<sup>2+</sup> toxicity, except at high Cd<sup>2+</sup> concentrations. Using a non-invasive Fourier-transform infrared (FTIR) spectroscopy protocol with robust acquisition parameters and principal component analysis, specific biochemical changes in membrane composition were monitored, with notable decreases in carbohydrate and lipid contents, while protein levels remained unaltered. Morphological observations revealed a shift toward the oval morphotype under exposure to Cd<sup>2+</sup> and PBAT, alone and in combination, featuring a stress response. Additionally, the light-harvesting pigments, chlorophyll-a and fucoxanthin, increased in a dose-dependent manner upon Cd<sup>2+</sup> exposure, while no significant β-carotene changes were observed, except at high Cd<sup>2+</sup> concentrations in the presence of PBAT. This effect is further amplified under co-exposure conditions, the presence of PBAT leading to a marked increase in all three pigments, β-carotene included. The experimental protocol, which involved the aging of PBAT macroplastics in seawater for a short period, suggests that the degradation products of PBAT themselves are responsible for these observed biological effects. It is worth noting that morphotype shifts occur at lower Cd<sup>2+</sup> concentrations than those affecting photosynthesis and photoprotective systems. These findings highlight the potential of <em>P. tricornutum</em> membrane fingerprints and morphotype shifts as sensitive ecotoxicological indicators of metal and plastic pollution, particularly in relation to degradation by-products in marine environments.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"216 ","pages":"Article 107890"},"PeriodicalIF":3.2,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146113589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Carbon concentration mechanisms in Canary Islands macroalgae and their implications for future benthic community structure under ocean acidification 加那利群岛大型藻类的碳浓度机制及其对海洋酸化下未来底栖生物群落结构的影响。

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

Marine environmental research

Pub Date : 2026-04-01 Epub Date: 2026-02-02 DOI: 10.1016/j.marenvres.2026.107898

Celso A. Hernández , Beatriz Alfonso , Carla Pérez , José Carlos Hernández

In recent decades, due to the anthropogenic CO₂ concentration increase in the atmosphere, the chemistry of seawater has been seriously altered, producing the phenomenon known as Ocean Acidification (OA). Of all the dissolved inorganic carbon (DIC) present in seawater, only 1% is in the form of CO₂. However, if anthropogenic CO₂ emissions to the atmosphere continue, it will no longer be a limiting resource. Part of the response of marine photosynthetic organisms to these changes depends on their carbon physiology. The presence and effectiveness of carbon concentration mechanisms (CCM) can define the production and growth of macroalgae under OA conditions. Although CCMs are not essential when the seawater concentration of inorganic carbon is high, species that do not use them can see their performance improved. Our goal was to determine the presence or absence of CCMs in a total of 19 species of common macroalgae in the Canary Islands through a pH drift experiment and to establish their primary production rates through incubations and measurements of the O₂ variation. Samples of each species were incubated during 8, 24 and 32 h in isolated containers and under controlled lighting and temperature conditions. Of the 19 species studied, 11 presented CCM and 8 did not present CCM. Five of the eight species that did not show the presence of CCMs in the present study are present in the CO₂ seeps of Fuencaliente and one of them, H. scoparia is a dominant species.

近几十年来，由于大气中二氧化碳浓度的人为增加，海水的化学性质发生了严重改变，产生了海洋酸化（OA）现象。在海水中所有溶解的无机碳（DIC）中，只有1%以二氧化碳的形式存在。然而，如果人类向大气排放的二氧化碳继续下去，它将不再是一种有限的资源。海洋光合生物对这些变化的部分反应取决于它们的碳生理。碳浓度机制（CCM）的存在和有效性决定了OA条件下大型藻类的生产和生长。虽然当海水中无机碳浓度较高时，ccm不是必需的，但不使用它们的物种可以看到它们的性能有所改善。我们的目标是通过pH漂移实验确定加那利群岛19种常见大型藻类中CCMs的存在与否，并通过孵育和测量O2变化来确定它们的初级生产速率。在控制光照和温度的条件下，分别在隔离容器中孵育8、24和32 h。在研究的19个物种中，11个存在CCM， 8个不存在CCM。在本研究中未显示CCMs存在的8个物种中，有5个存在于Fuencaliente的CO2渗漏中，其中一个优势种是scoparia。

{"title":"Carbon concentration mechanisms in Canary Islands macroalgae and their implications for future benthic community structure under ocean acidification","authors":"Celso A. Hernández , Beatriz Alfonso , Carla Pérez , José Carlos Hernández","doi":"10.1016/j.marenvres.2026.107898","DOIUrl":"10.1016/j.marenvres.2026.107898","url":null,"abstract":"<div><div>In recent decades, due to the anthropogenic CO<sub>2</sub> concentration increase in the atmosphere, the chemistry of seawater has been seriously altered, producing the phenomenon known as Ocean Acidification (OA). Of all the dissolved inorganic carbon (DIC) present in seawater, only 1% is in the form of CO<sub>2</sub>. However, if anthropogenic CO<sub>2</sub> emissions to the atmosphere continue, it will no longer be a limiting resource. Part of the response of marine photosynthetic organisms to these changes depends on their carbon physiology. The presence and effectiveness of carbon concentration mechanisms (CCM) can define the production and growth of macroalgae under OA conditions. Although CCMs are not essential when the seawater concentration of inorganic carbon is high, species that do not use them can see their performance improved. Our goal was to determine the presence or absence of CCMs in a total of 19 species of common macroalgae in the Canary Islands through a pH drift experiment and to establish their primary production rates through incubations and measurements of the O<sub>2</sub> variation. Samples of each species were incubated during 8, 24 and 32 h in isolated containers and under controlled lighting and temperature conditions. Of the 19 species studied, 11 presented CCM and 8 did not present CCM. Five of the eight species that did not show the presence of CCMs in the present study are present in the CO<sub>2</sub> seeps of Fuencaliente and one of them, <em>H. scoparia</em> is a dominant species.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"216 ","pages":"Article 107898"},"PeriodicalIF":3.2,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146119463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A phycospheric bacteria perspective: Preliminary investigation into the differential formation of sporangial branchlets in Pyropia haitanensis under varied temperatures and light intensities 藻球细菌视角：不同温度和光照条件下海地焦皮藻孢子囊小枝差异形成的初步研究

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

Marine environmental research

Pub Date : 2026-04-01 Epub Date: 2026-01-22 DOI: 10.1016/j.marenvres.2026.107848

Rui Zhao , Rui Chai , Qingli Gong , Ningning Xu , Wenjie Yan , Xu Gao

Temperature and light intensity are two important abiotic factors influencing the growth and development of marine macroalgae. In this study, we investigated the differences in the sporangial branchlets formation of Pyropia haitanensis under different temperatures and light intensities. The physiological profiling and phycospheric bacterial community changes were examined. We observed that the increasing temperature group (Group A: 29 °C, 60 μmol m⁻² s⁻¹, and Group C: 29 °C, 20 μmol m⁻² s⁻¹) exhibited extensive formation of sporangial branchlets, whereas the decreasing light intensity group (Group B: 21 °C, 60 μmol m⁻² s⁻¹) rarely formed sporangial branchlets. Conchocelis of P. haitanensis adapted to temperature and light intensity shifts by altering chlorophyll fluorescence, pigment proteins and oxidative damage indicator (malondialdehyde). The 16S rRNA gene sequencing revealed significant differences in the relative abundance of phycospheric bacteria among the 4 treatments. The relative abundance of 7 bacteria was significantly increased in Group A and Group C, while that of 4 bacteria was increased in the Group B. Notably, Bacillus and Pseudonocardia were common dominant phycospheric bacteria in the increasing temperature group. Correlation heatmap analyses revealed that the phycospheric bacteria were closely associated with the environmental factors and physiological data. However, the underlying mechanism of this association remains to be further investigated. This study contributes to understanding how environmental changes and microorganisms are linked in the artificial seedling cultivation of P. haitanensis.

温度和光强是影响海洋巨藻生长发育的两个重要的非生物因素。本研究研究了不同温度和光照条件下海檀焦皮（Pyropia haitanensis）孢子小枝形成的差异。研究了生理特征和藻球细菌群落的变化。结果表明，温度升高组（A: 29℃，60 μmol m−2 s−1）和温度升高组（C: 29℃，20 μmol m−2 s−1）孢子小枝大量形成，而温度降低组（B: 21℃，60 μmol m−2 s−1）孢子小枝很少形成。海棠螺通过改变叶绿素荧光、色素蛋白和氧化损伤指标（丙二醛）来适应温度和光强的变化。16S rRNA基因测序结果显示，4个处理间藻球菌相对丰度差异显著。A组和C组有7种细菌的相对丰度显著增加，b组有4种细菌的相对丰度显著增加。值得注意的是，在温度升高组，芽孢杆菌和假心杆菌是常见的优势藻球细菌。相关热图分析表明，藻球细菌与环境因素和生理数据密切相关。然而，这种关联的潜在机制仍有待进一步研究。本研究有助于了解海棠人工育苗过程中环境变化与微生物的关系。

{"title":"A phycospheric bacteria perspective: Preliminary investigation into the differential formation of sporangial branchlets in Pyropia haitanensis under varied temperatures and light intensities","authors":"Rui Zhao , Rui Chai , Qingli Gong , Ningning Xu , Wenjie Yan , Xu Gao","doi":"10.1016/j.marenvres.2026.107848","DOIUrl":"10.1016/j.marenvres.2026.107848","url":null,"abstract":"<div><div>Temperature and light intensity are two important abiotic factors influencing the growth and development of marine macroalgae. In this study, we investigated the differences in the sporangial branchlets formation of <em>Pyropia haitanensis</em> under different temperatures and light intensities. The physiological profiling and phycospheric bacterial community changes were examined. We observed that the increasing temperature group (Group A: 29 °C, 60 μmol m<sup>−2</sup> s<sup>−1</sup>, and Group C: 29 °C, 20 μmol m<sup>−2</sup> s<sup>−1</sup>) exhibited extensive formation of sporangial branchlets, whereas the decreasing light intensity group (Group B: 21 °C, 60 μmol m<sup>−2</sup> s<sup>−1</sup>) rarely formed sporangial branchlets. Conchocelis of <em>P. haitanensis</em> adapted to temperature and light intensity shifts by altering chlorophyll fluorescence, pigment proteins and oxidative damage indicator (malondialdehyde). The 16S rRNA gene sequencing revealed significant differences in the relative abundance of phycospheric bacteria among the 4 treatments. The relative abundance of 7 bacteria was significantly increased in Group A and Group C, while that of 4 bacteria was increased in the Group B. Notably, <em>Bacillus</em> and <em>Pseudonocardia</em> were common dominant phycospheric bacteria in the increasing temperature group. Correlation heatmap analyses revealed that the phycospheric bacteria were closely associated with the environmental factors and physiological data. However, the underlying mechanism of this association remains to be further investigated. This study contributes to understanding how environmental changes and microorganisms are linked in the artificial seedling cultivation of <em>P. haitanensis</em>.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"216 ","pages":"Article 107848"},"PeriodicalIF":3.2,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146080432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bio-invasion and decadal changes in the trophic dynamics of a temporarily closed estuary: An Ecopath model from Veli-Akkulam Estuary, Kerala, India 临时封闭河口营养动态的生物入侵和年代际变化：来自印度喀拉拉邦Veli-Akkulam河口的生态模型

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

Marine environmental research

Pub Date : 2026-04-01 Epub Date: 2026-01-29 DOI: 10.1016/j.marenvres.2026.107895

Regi Syamala Ramachandrannair , Kiranya Bella , Sreekanth Giri Bhavan , Smrithy Raj , Appukuttannair Biju Kumar

Temporarily closed estuarine ecosystems (TCEs) are ecologically sensitive environments increasingly impacted by anthropogenic pressures and biological invasions. This study employs a mass-balanced trophic model using the Ecopath with Ecosim (EwE) framework to evaluate long-term changes in the structure and function of the Veli-Akkulam Estuary, a small TCE on the southwest coast of India. Based on field data from 2022 to 2023, the model integrates 17 functional groups, including invasive alien species such as Oreochromis mossambicus, O. niloticus, and Pterygoplichthys pardalis. Model outputs were compared with historical assessments from 1993 to 2008–2010 to examine decadal-scale shifts in ecosystem properties and dynamics.

Key ecological indicators such as mean trophic level of the catch (2.69), transfer efficiency (7.69 %), and Finn's Cycling Index (2.64 %) point to a simplified, detritus-dominated food web with reduced energy cycling and declining trophic maturity. Biomass is concentrated at lower trophic levels, while apex predators and native piscivores have markedly declined. Mixed Trophic Impact analysis revealed strong negative interactions between invasive species, particularly O. mossambicus, and native fish groups, suggesting competitive displacement and altered trophic relationships. High niche overlap further supports the hypothesis of dietary competition between invasive and native taxa, contributing to trophic reorganization.

System-level metrics, including a relative ascendancy of 37.42% and system overhead of 62.58%, indicate reduced ecosystem organization and rising instability. These trends reflect a transition from a functionally complex system to one increasingly dominated by opportunistic and invasive species. The study underscores the utility of Ecopath with Ecosim-based modelling in diagnosing trophic degradation and informing adaptive management. This study provides the first decadal Ecopath model demonstrating invasion-driven trophic simplification in a temporarily closed tropical estuary, and offers a replicable framework for assessing cumulative ecological impacts in tropical estuarine systems impacted by invasive species.

暂时封闭河口生态系统是受人为压力和生物入侵影响日益严重的生态敏感环境。本研究采用了一个质量平衡的营养模型，使用Ecopath with Ecosim （EwE）框架来评估印度西南海岸的一个小型TCE——Veli-Akkulam河口的结构和功能的长期变化。该模型基于2022年至2023年的野外数据，整合了17个功能群，包括入侵外来物种如Oreochromis mossambicus、O. niloticus和Pterygoplichthys pardalis。将模型输出与1993年至2008-2010年的历史评估结果进行比较，以检验生态系统特性和动态的年代际变化。关键的生态指标，如渔获物的平均营养水平（2.69）、转移效率（7.69%）和芬恩循环指数（2.64%）表明，这是一个简化的、以碎屑为主的食物网，能量循环减少，营养成熟度下降。生物量集中在低营养层，而顶端捕食者和本地鱼食性动物明显减少。混合营养影响分析显示，入侵物种（尤其是莫sambicus）与本地鱼类之间存在强烈的负相互作用，表明竞争位移和营养关系的改变。高生态位重叠进一步支持了入侵和本地类群之间的饮食竞争假说，有助于营养重组。系统级指标，包括37.42%的相对优势和62.58%的系统开销，表明生态系统组织减少，不稳定性上升。这些趋势反映了从一个功能复杂的系统向一个日益由机会主义和入侵物种主导的系统的转变。该研究强调了基于ecosim模型的Ecopath在诊断营养退化和告知适应性管理方面的效用。本研究提供了第一个十年代际生态模型，展示了暂时关闭的热带河口入侵驱动的营养简化，并为评估入侵物种对热带河口系统的累积生态影响提供了一个可复制的框架。

{"title":"Bio-invasion and decadal changes in the trophic dynamics of a temporarily closed estuary: An Ecopath model from Veli-Akkulam Estuary, Kerala, India","authors":"Regi Syamala Ramachandrannair , Kiranya Bella , Sreekanth Giri Bhavan , Smrithy Raj , Appukuttannair Biju Kumar","doi":"10.1016/j.marenvres.2026.107895","DOIUrl":"10.1016/j.marenvres.2026.107895","url":null,"abstract":"<div><div>Temporarily closed estuarine ecosystems (TCEs) are ecologically sensitive environments increasingly impacted by anthropogenic pressures and biological invasions. This study employs a mass-balanced trophic model using the Ecopath with Ecosim (EwE) framework to evaluate long-term changes in the structure and function of the Veli-Akkulam Estuary, a small TCE on the southwest coast of India. Based on field data from 2022 to 2023, the model integrates 17 functional groups, including invasive alien species such as <em>Oreochromis mossambicus</em>, <em>O. niloticus</em>, and <em>Pterygoplichthys pardalis</em>. Model outputs were compared with historical assessments from 1993 to 2008–2010 to examine decadal-scale shifts in ecosystem properties and dynamics.</div><div>Key ecological indicators such as mean trophic level of the catch (2.69), transfer efficiency (7.69 %), and Finn's Cycling Index (2.64 %) point to a simplified, detritus-dominated food web with reduced energy cycling and declining trophic maturity. Biomass is concentrated at lower trophic levels, while apex predators and native piscivores have markedly declined. Mixed Trophic Impact analysis revealed strong negative interactions between invasive species, particularly <em>O. mossambicus</em>, and native fish groups, suggesting competitive displacement and altered trophic relationships. High niche overlap further supports the hypothesis of dietary competition between invasive and native taxa, contributing to trophic reorganization.</div><div>System-level metrics, including a relative ascendancy of 37.42% and system overhead of 62.58%, indicate reduced ecosystem organization and rising instability. These trends reflect a transition from a functionally complex system to one increasingly dominated by opportunistic and invasive species. The study underscores the utility of Ecopath with Ecosim-based modelling in diagnosing trophic degradation and informing adaptive management. This study provides the first decadal Ecopath model demonstrating invasion-driven trophic simplification in a temporarily closed tropical estuary, and offers a replicable framework for assessing cumulative ecological impacts in tropical estuarine systems impacted by invasive species.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"216 ","pages":"Article 107895"},"PeriodicalIF":3.2,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ocean acidification modifies site fidelity and patterns of seagrass habitat use by a herbivorous fish 海洋酸化改变了草食性鱼类使用海草栖息地的地点保真度和模式

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

Marine environmental research

Pub Date : 2026-04-01 Epub Date: 2026-02-10 DOI: 10.1016/j.marenvres.2026.107914

Alice Mirasole , Antonio Di Franco , Cristina Andolina , Maria Cristina Gambi , Bronwyn May Gillanders , Giovannella Pecoraino , Patrick Reis-Santos , Giovanna Scopelliti , Emanuele Somma , Salvatrice Vizzini , Nuria Teixidó

Ocean acidification (OA), characterized by changes in seawater chemistry and a concomitant decline of pH due to the uptake by seawater of the atmospheric CO₂, will profoundly shape marine ecosystems. The lower pH/higher pCO₂ can act negatively (as a stressor for organisms with a calcareous exoskeleton) or positively (as a direct resource for primary producers like macrophytes). Consequently, herbivores may indirectly benefit from OA counteracting the direct negative effects of living under high pCO₂/low pH conditions. Here, we investigated how OA may influence site fidelity, habitat use, and trophic behaviour patterns of Sarpa salpa, the main herbivorous fish associated with Posidonia oceanica meadows in the north-western Mediterranean Sea. We assessed if and how OA influences the habitat use of S. salpa by comparing natural tags, in otoliths and muscle tissues, between CO₂ vents and reference pH sites. We did not find differences in otolith elemental composition and shape among fish exposed to different pH conditions (CO₂ vent vs ambient pH sites). However, otolith isotopic signatures differed between life stages (young vs sub-adults), consistent with the variations observed in seawater-dissolved inorganic carbon across sites. Finally, comparisons of the nutritional value marine vegetation (macroalgae, P. oceanica, epiphytes) showed that P. oceanica and epiphytes were more nutritious at CO₂ vents, along with increased consumption by S. salpa. This trophic separation indicates that S. salpa spent more time exploiting the trophic resources in the CO₂ vents. Together, our findings shed new light on plant–herbivore interactions within P. oceanica meadows under future OA scenarios.

海洋酸化（OA）的特征是海水化学变化以及海水吸收大气CO2导致的pH值下降，这将深刻地影响海洋生态系统。较低的pH/较高的二氧化碳分压可以起到消极的作用（作为具有钙质外骨骼的生物体的压力源）或积极的作用（作为大型植物等初级生产者的直接资源）。因此，草食动物可能间接受益于OA抵消生活在高pCO2/低pH条件下的直接负面影响。在这里，我们研究了OA如何影响萨尔帕（salpa salpa）的场地保真度、栖息地利用和营养行为模式。萨尔帕是地中海西北部海洋波西多尼亚草甸上的主要草食性鱼类。我们通过比较耳石和肌肉组织中的天然标签，在CO2排放点和参考pH值之间，评估OA是否以及如何影响S. salpa的栖息地利用。我们没有发现暴露在不同pH条件下的鱼耳石元素组成和形状的差异（二氧化碳排放口与环境pH值）。然而，耳石同位素特征在不同的生命阶段（年轻与亚成年）有所不同，这与在不同地点观察到的海水溶解无机碳的变化一致。最后，对海洋植被（大型藻类、大洋藻和附生植物）的营养价值进行了比较，结果表明大洋藻和附生植物在CO2排放口的营养价值更高，同时也增加了salpa的消耗。这种营养分离表明萨尔巴花了更多的时间来利用CO2喷口中的营养资源。总之，我们的发现为未来OA情景下海洋草甸植物-食草动物的相互作用提供了新的视角。

{"title":"Ocean acidification modifies site fidelity and patterns of seagrass habitat use by a herbivorous fish","authors":"Alice Mirasole , Antonio Di Franco , Cristina Andolina , Maria Cristina Gambi , Bronwyn May Gillanders , Giovannella Pecoraino , Patrick Reis-Santos , Giovanna Scopelliti , Emanuele Somma , Salvatrice Vizzini , Nuria Teixidó","doi":"10.1016/j.marenvres.2026.107914","DOIUrl":"10.1016/j.marenvres.2026.107914","url":null,"abstract":"<div><div>Ocean acidification (OA), characterized by changes in seawater chemistry and a concomitant decline of pH due to the uptake by seawater of the atmospheric CO<sub>2</sub>, will profoundly shape marine ecosystems. The lower pH/higher <em>p</em>CO<sub>2</sub> can act negatively (as a stressor for organisms with a calcareous exoskeleton) or positively (as a direct resource for primary producers like macrophytes). Consequently, herbivores may indirectly benefit from OA counteracting the direct negative effects of living under high <em>p</em>CO<sub>2</sub>/low pH conditions. Here, we investigated how OA may influence site fidelity, habitat use, and trophic behaviour patterns of <em>Sarpa salpa,</em> the main herbivorous fish associated with <em>Posidonia oceanica</em> meadows in the north-western Mediterranean Sea. We assessed if and how OA influences the habitat use of <em>S. salpa</em> by comparing natural tags, in otoliths and muscle tissues, between CO<sub>2</sub> vents and reference pH sites. We did not find differences in otolith elemental composition and shape among fish exposed to different pH conditions (CO<sub>2</sub> vent <em>vs</em> ambient pH sites). However, otolith isotopic signatures differed between life stages (young <em>vs</em> sub-adults), consistent with the variations observed in seawater-dissolved inorganic carbon across sites. Finally, comparisons of the nutritional value marine vegetation (macroalgae, <em>P. oceanica</em>, epiphytes) showed that <em>P. oceanica</em> and epiphytes were more nutritious at CO<sub>2</sub> vents, along with increased consumption by <em>S. salpa</em>. This trophic separation indicates that <em>S. salpa</em> spent more time exploiting the trophic resources in the CO<sub>2</sub> vents. Together, our findings shed new light on plant–herbivore interactions within <em>P. oceanica</em> meadows under future OA scenarios.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"216 ","pages":"Article 107914"},"PeriodicalIF":3.2,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impacts of co-exposure to nanoplastics and ofloxacin on marine planktonic microbial communities and DMSP dynamics 纳米塑料和氧氟沙星共暴露对海洋浮游微生物群落和DMSP动态的影响

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

Marine environmental research

Pub Date : 2026-04-01 Epub Date: 2026-02-05 DOI: 10.1016/j.marenvres.2026.107908

Yurou Jiang , Wangxinze Shu , Jiyuan Wan , Jinke Yan , Qian Liu , Yong Jiang

Dimethylsulfoniopropionate (DMSP) is a key organic sulfur compound in marine food webs and the main precursor of the climate-active gas dimethyl sulfide (DMS), yet its water-column cycling under the joint influence of emerging pollutants remains poorly constrained. A 19-day microcosm experiment was conducted to examine the long-term effects of single and combined exposure to nanoplastics (NPs) and the antibiotic ofloxacin on planktonic microbial communities and DMSP cycling in coastal seawater. Combined exposure induced much stronger inhibitory effects than either single pollutant, markedly weakening the late-phase biomass recovery observed under the antibiotic-only treatment. DMSP dynamics exhibited a biphasic disruption pattern: an initial transient accumulation was followed by persistently low concentrations later in the experiment, coinciding with pronounced declines in microeukaryotic and total biomass. Combined metagenomic and flow cytometric analyses revealed a “functional decoupling” scenario, in which the surviving community displayed elevated relative abundances of DMSP biosynthesis- and degradation-related genes, while the sharp reduction in microeukaryotic biomass and overall community size constrained the maintenance and renewal of the water-column DMSP pool. Co-occurrence network analysis further showed that co-exposure simplified the microbial network from a more distributed, complex structure to a highly centralized one, with fewer nodes and keystone taxa and decreased robustness indices along the pollution gradient. Together, these findings indicate that the co-occurrence of nanoplastics and antibiotics can disturb DMSP-related functions by eroding community structural stability and functional redundancy, providing experimental evidence for the vulnerability of coastal DMSP cycling to mixed-pollutant stress.

二甲基磺丙酸酯（DMSP）是海洋食物网中重要的有机硫化合物，也是气候活性气体二甲基硫化物（DMS）的主要前体，但其水柱循环在新出现的污染物的共同影响下仍然缺乏约束。通过一项为期19天的微观实验，研究了纳米塑料（NPs）和抗生素氧氟沙星对沿海海水浮游微生物群落和DMSP循环的长期影响。联合暴露诱导的抑制效果比任何一种单一污染物都要强得多，明显削弱了仅抗生素处理下观察到的后期生物量恢复。DMSP动力学表现出两相中断模式：最初的短暂积累随后是实验后期持续的低浓度，与微真核生物和总生物量的显着下降相一致。宏基因组和流式细胞分析的结合揭示了一种“功能解耦”的情况，在这种情况下，存活的群落显示出DMSP生物合成和降解相关基因的相对丰度升高，而微真核生物生物量和总体群落规模的急剧减少限制了水柱DMSP池的维持和更新。共现网络分析进一步表明，共暴露使微生物网络从一个较为分散、复杂的结构简化为一个高度集中的网络，节点和关键类群减少，沿污染梯度稳健性指数下降。综上所述，纳米塑料和抗生素的共存可以通过破坏群落结构稳定性和功能冗余来干扰DMSP相关功能，为沿海DMSP循环在混合污染物胁迫下的脆弱性提供了实验证据。

{"title":"Impacts of co-exposure to nanoplastics and ofloxacin on marine planktonic microbial communities and DMSP dynamics","authors":"Yurou Jiang , Wangxinze Shu , Jiyuan Wan , Jinke Yan , Qian Liu , Yong Jiang","doi":"10.1016/j.marenvres.2026.107908","DOIUrl":"10.1016/j.marenvres.2026.107908","url":null,"abstract":"<div><div>Dimethylsulfoniopropionate (DMSP) is a key organic sulfur compound in marine food webs and the main precursor of the climate-active gas dimethyl sulfide (DMS), yet its water-column cycling under the joint influence of emerging pollutants remains poorly constrained. A 19-day microcosm experiment was conducted to examine the long-term effects of single and combined exposure to nanoplastics (NPs) and the antibiotic ofloxacin on planktonic microbial communities and DMSP cycling in coastal seawater. Combined exposure induced much stronger inhibitory effects than either single pollutant, markedly weakening the late-phase biomass recovery observed under the antibiotic-only treatment. DMSP dynamics exhibited a biphasic disruption pattern: an initial transient accumulation was followed by persistently low concentrations later in the experiment, coinciding with pronounced declines in microeukaryotic and total biomass. Combined metagenomic and flow cytometric analyses revealed a “functional decoupling” scenario, in which the surviving community displayed elevated relative abundances of DMSP biosynthesis- and degradation-related genes, while the sharp reduction in microeukaryotic biomass and overall community size constrained the maintenance and renewal of the water-column DMSP pool. Co-occurrence network analysis further showed that co-exposure simplified the microbial network from a more distributed, complex structure to a highly centralized one, with fewer nodes and keystone taxa and decreased robustness indices along the pollution gradient. Together, these findings indicate that the co-occurrence of nanoplastics and antibiotics can disturb DMSP-related functions by eroding community structural stability and functional redundancy, providing experimental evidence for the vulnerability of coastal DMSP cycling to mixed-pollutant stress.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"216 ","pages":"Article 107908"},"PeriodicalIF":3.2,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146170833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0