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Combined effects of high-fat diet feeding and Streptococcus agalactiae infection on lipid metabolism, antioxidant status, and immune response in tilapia (Oreochromis niloticus). 高脂饲料饲养和无乳链球菌感染对罗非鱼脂质代谢、抗氧化状态和免疫反应的联合影响
IF 4.3 3区 环境科学与生态学
Comparative Biochemistry and Physiology C-toxicology & Pharmacology Pub Date : 2025-12-01 Epub Date: 2025-08-07 DOI: 10.1016/j.cbpc.2025.110321
Rui Jia, Yiran Hou, Linjun Zhou, Chengfeng Zhang, Bing Li, Jian Zhu
{"title":"Combined effects of high-fat diet feeding and Streptococcus agalactiae infection on lipid metabolism, antioxidant status, and immune response in tilapia (Oreochromis niloticus).","authors":"Rui Jia, Yiran Hou, Linjun Zhou, Chengfeng Zhang, Bing Li, Jian Zhu","doi":"10.1016/j.cbpc.2025.110321","DOIUrl":"10.1016/j.cbpc.2025.110321","url":null,"abstract":"<p><p>High-fat diet (HFD) and Streptococcus agalactiae are common pathogenic factors affecting tilapia health, yet their combined effects and underlying mechanisms are not well understood. To address this, we conducted a comprehensive evaluation of the potential response mechanisms in tilapia subjected to both factors. Tilapia were fed normal (NC) or high-fat diet (HFD) for 90 days, then challenged with S. agalactiae. At 48 h post-infection, blood, liver, and spleen samples were collected for biochemical parameter analysis and gene expression profiling. The results indicated that the combined treatment upregulated the expression of peroxisome proliferator-activated receptor α (pparα) and fatty acid transport protein 1 (fatp1). Concurrently, it increased 3-hydroxy-3-methylglutaryl-CoA reductase (hmgcr) expression, while decreasing cholesterol 7α-hydroxylase (cyp7a1) expression compared to HFD alone. Antioxidant status analysis revealed that the combined treatment decreased glutathione (GSH) content, total antioxidant capacity (T-AOC), and mRNA levels of nuclear factor erythroid 2-related factor 2 (nrf2), NAD(P)H quinone dehydrogenase 1 (nqo1), and glutathione peroxidase 3 (gpx3). Intriguingly, while both individual stressors upregulated inflammatory and immune-related genes, their combination suppressed interleukin-1β (il-1β), il-8, and immunoglobulin M (igm) expression compared to infection alone. The apoptotic response triggered by S. agalactiae infection, characterized by elevated caspase-3 (cas3), cas9, and cytochrome c (cytc), was inhibited in the liver of combined treatment group. Moreover, all experimental groups showed elevated expression of endoplasmic reticulum stress-related genes: inositol-requiring enzyme 1 (ire1), eukaryotic translation initiation factor 2 alpha kinase 3 (eif2ak3), activating transcription factor 6 (atf6), and binding immunoglobulin protein (bip). These findings collectively demonstrated that HFD exacerbated the pathogenic effects of S. agalactiae through multiple mechanisms, including metabolic dysregulation, oxidative stress potentiation, and complex immunomodulation. Furthermore, the Nrf2 and NF-kB signaling pathways may be implicated in mediating these adverse effects.</p>","PeriodicalId":10602,"journal":{"name":"Comparative Biochemistry and Physiology C-toxicology & Pharmacology","volume":" ","pages":"110321"},"PeriodicalIF":4.3,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144811914","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
Mitochondrial function and energy metabolism response of Megalobrama amblycephala under heat and hypoxia. 热缺氧条件下双头巨鲷线粒体功能及能量代谢反应。
IF 4.3 3区 环境科学与生态学
Comparative Biochemistry and Physiology C-toxicology & Pharmacology Pub Date : 2025-12-01 Epub Date: 2025-08-05 DOI: 10.1016/j.cbpc.2025.110306
Kang Chen, Zheng He, Peiyu Xie, Yihui Jia, Hong Liu, Zexia Gao, Huanling Wang
{"title":"Mitochondrial function and energy metabolism response of Megalobrama amblycephala under heat and hypoxia.","authors":"Kang Chen, Zheng He, Peiyu Xie, Yihui Jia, Hong Liu, Zexia Gao, Huanling Wang","doi":"10.1016/j.cbpc.2025.110306","DOIUrl":"10.1016/j.cbpc.2025.110306","url":null,"abstract":"<p><p>Ongoing global climate change and anthropogenic activities are increasingly subjecting aquatic animals to heat and hypoxia stress. These environmental perturbations can profoundly impact mitochondrial function and energy metabolism. The current study aimed to delineate the adaptive mechanisms of mitochondrial dynamics and energy metabolism in the blunt snout bream (Megalobrama amblycephala) under three experimental conditions: heat stress (HT group, 35 °C of temperature), hypoxia stress (LO group, 2 mg/L of dissolved oxygen), and combined heat plus hypoxia stress (HL group, 35 °C and 2 mg/L). The results demonstrated that heat and/or hypoxia stresses damaged mitochondrial structure and disrupted fusion-fission balance. The activities of key TCA cycle enzymes (e.g. SDH, CS) were significantly decreased. Conversely, energy metabolism was regulated through an increased AMP/ATP ratio and activation of AMPKα1/AMPKα2 proteins. The expression of glycolytic enzymes (PK, PFK, HK and LDH) was up-regulated. However, heat and/or hypoxia stresses resulted in severe consumption of serum glucose and liver glycogen, with the most pronounced consumption in the HL group. Other saccharides such as mannose and lactose were also significantly reduced in HT and HL groups. The decomposition and metabolism of amino acids was an important auxiliary mechanism. Regarding lipid metabolism, the expression of lipolysis and lipogenesis related genes was down-regulated, while glycerophospholipids accumulation contributed to maintaining membrane integrity. These findings benefit the understanding of environmental adaptive characteristics in aquatic animals and provide effective strategies for aquaculture management.</p>","PeriodicalId":10602,"journal":{"name":"Comparative Biochemistry and Physiology C-toxicology & Pharmacology","volume":" ","pages":"110306"},"PeriodicalIF":4.3,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144788452","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
Human mitochondrial CYP2E1-mediated styrene metabolism increases oxidative stress and impairs antioxidant rescue in Caenorhabditis elegans. 人线粒体cyp2e1介导的苯乙烯代谢增加秀丽隐杆线虫的氧化应激并损害抗氧化修复。
IF 4.3 3区 环境科学与生态学
Comparative Biochemistry and Physiology C-toxicology & Pharmacology Pub Date : 2025-12-01 Epub Date: 2025-08-06 DOI: 10.1016/j.cbpc.2025.110319
Amanda Ameyaa-Sakyi, Todd R Harris, Colleen E Clarke, David R McMullin, Kacy L Gordon, David Sherwood, Jessica H Hartman, Amy A Rand
{"title":"Human mitochondrial CYP2E1-mediated styrene metabolism increases oxidative stress and impairs antioxidant rescue in Caenorhabditis elegans.","authors":"Amanda Ameyaa-Sakyi, Todd R Harris, Colleen E Clarke, David R McMullin, Kacy L Gordon, David Sherwood, Jessica H Hartman, Amy A Rand","doi":"10.1016/j.cbpc.2025.110319","DOIUrl":"10.1016/j.cbpc.2025.110319","url":null,"abstract":"<p><p>Styrene is an environmental toxicant metabolized by cytochrome P450 2E1 (CYP2E1) to styrene oxide, a reactive intermediate product linked to oxidative stress. While the role of CYP2E1 in xenobiotic metabolism is well established, the influence of subcellular enzyme localization on styrene-induced toxicity remains unclear. This study used transgenic Caenorhabditis elegans (C. elegans) strains expressing CYP2E1 in different compartments, mitochondrial-derived (mtCYP2E1) and endoplasmic reticulum-derived (erCYP2E1), to investigate the impact of CYP2E1-mediated styrene metabolism on survival and oxidative stress. CYP2E1 containing C. elegans strains were also compared to a wildtype strain (N2) lacking CYP2E1. Styrene exposure significantly decreased survival across all strains. Antioxidant rescue assays revealed that Trolox and N-acetyl cysteine (NAC) improved survival in the N2 and erCYP2E1 C. elegans strains but not in mtCYP2E1, indicating a distinct oxidative stress mechanism in mitochondrial CYP2E1 metabolism. Fluorescent microscopy confirmed that ROS levels increased with styrene exposure, particularly in mtCYP2E1 C. elegans, where ROS levels were up to two-fold higher than in other strains. GC-MS analysis detected elevated styrene glycol production in styrene-exposed mtCYP2E1 C. elegans relative to N2 and erCYP2E1 strains. Given styrene oxide is a known cytotoxic intermediate, its accumulation in the mtCYP2E1 strain likely contributes to the observed oxidative stress and decreased survival. These findings suggest that CYP2E1 subcellular localization influences styrene metabolism and toxicity, with mitochondrial CYP2E1 potentially promoting higher oxidative stress and reduced detoxification efficiency. A better understanding of these mechanisms could provide insight into xenobiotic metabolism, environmental toxicology, and disease pathogenesis associated with CYP2E1-mediated oxidative stress.</p>","PeriodicalId":10602,"journal":{"name":"Comparative Biochemistry and Physiology C-toxicology & Pharmacology","volume":" ","pages":"110319"},"PeriodicalIF":4.3,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144803825","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
Molecular markers of stress in the sea urchin embryo test: Analysing the effect of climate change and pollutant mixtures on Paracentrotus lividus larvae. 海胆胚胎试验中胁迫的分子标记:分析气候变化和污染物混合对lividus副中央螺幼虫的影响。
IF 4.3 3区 环境科学与生态学
Comparative Biochemistry and Physiology C-toxicology & Pharmacology Pub Date : 2025-12-01 Epub Date: 2025-08-06 DOI: 10.1016/j.cbpc.2025.110320
Juan Ignacio Bertucci, Angie Blanco Osorio, Leticia Vidal-Liñán, Juan Bellas
{"title":"Molecular markers of stress in the sea urchin embryo test: Analysing the effect of climate change and pollutant mixtures on Paracentrotus lividus larvae.","authors":"Juan Ignacio Bertucci, Angie Blanco Osorio, Leticia Vidal-Liñán, Juan Bellas","doi":"10.1016/j.cbpc.2025.110320","DOIUrl":"10.1016/j.cbpc.2025.110320","url":null,"abstract":"<p><p>Climate change and pollution represent critical stressors for marine ecosystems, particularly for calcifying organisms such as the sea urchin Paracentrotus lividus. This study examines the combined effects of ocean acidification (OA), ocean warming (OW), and microplastics (MP) loaded with chlorpyrifos (CPF), a broad-spectrum organophosphate insecticide, on sea urchin larvae, evaluating growth and molecular endpoints. Experimental treatments simulated future ocean conditions predicted for 2100, exposing larvae to varying temperature and pH levels, alongside CPF-contaminated MP. RNA sequencing (RNA-seq) was utilized to assess gene expression changes, revealing significant transcriptional shifts in metabolic, cellular, and developmental pathways. Morphological responses showed reduced larval growth, exacerbated under OA and OW conditions. Molecular analyses identified key upregulated pathways associated with stress response, including nitrogen metabolism and extracellular matrix remodelling, while downregulated genes involved DNA stability, cell cycle regulation, and enzymatic activities. These findings suggest a dual compensatory and deleterious response to combined stressors. Notably, temperature acted as a modulator of stressor effects, amplifying oxidative stress and metabolic costs at higher temperatures. Potential biomarkers, such as genes involved in actin regulation and embryonic development, were identified, offering possible tools for early detection of environmental stress. This study highlights the compounded impacts of anthropogenic and climate-induced stressors on marine invertebrates, emphasizing the need for integrative molecular approaches in ecotoxicology. Our findings contribute to the understanding of organismal adaptation and vulnerability in the face of global climate change and pollution, informing conservation strategies for marine ecosystems.</p>","PeriodicalId":10602,"journal":{"name":"Comparative Biochemistry and Physiology C-toxicology & Pharmacology","volume":" ","pages":"110320"},"PeriodicalIF":4.3,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144803826","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
Corrigendum to "Assessing CO₂ sources and sinks in and around Taiwan: Implication for achieving regional carbon neutrality by 2050" [Mar. Pollut. Bull. 206 (2024) 116664]. 《评估台湾及周边地区的二氧化碳源汇:2050年实现区域碳中和的意义》的勘误表[3月污染。牛报。206(2024)116664]。
IF 4.9 3区 环境科学与生态学
Marine pollution bulletin Pub Date : 2025-11-01 Epub Date: 2025-08-06 DOI: 10.1016/j.marpolbul.2025.118543
Chin-Chang Hung, Hsueh-Han Hsieh, Wen-Chen Chou, En-Chi Liu, Chun Hoe Chow, Yi Chang, Tse-Min Lee, Peter Hans Santsch, R R M K P Ranatunga, Hernando P Bacosa, Yung-Yen Shih
{"title":"Corrigendum to \"Assessing CO₂ sources and sinks in and around Taiwan: Implication for achieving regional carbon neutrality by 2050\" [Mar. Pollut. Bull. 206 (2024) 116664].","authors":"Chin-Chang Hung, Hsueh-Han Hsieh, Wen-Chen Chou, En-Chi Liu, Chun Hoe Chow, Yi Chang, Tse-Min Lee, Peter Hans Santsch, R R M K P Ranatunga, Hernando P Bacosa, Yung-Yen Shih","doi":"10.1016/j.marpolbul.2025.118543","DOIUrl":"10.1016/j.marpolbul.2025.118543","url":null,"abstract":"","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":" ","pages":"118543"},"PeriodicalIF":4.9,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144799554","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
Removal efficiency and microbial community shifts in full-scale versus laboratory-scale bank filtration systems using horizontal collector wells. 在使用水平收集井的全面和实验室规模的银行过滤系统中,去除效率和微生物群落发生了变化。
IF 4.4 3区 环境科学与生态学
Journal of contaminant hydrology Pub Date : 2025-11-01 Epub Date: 2025-07-31 DOI: 10.1016/j.jconhyd.2025.104689
Sang Yeob Kim, Jin Hyung Noh, Minjoo Lee, Joonhong Park, Young Joo Lee, Jeong Joo Park, Heejong Son, Woorim Lee, Feifei Wang, Sung Kyu Maeng
{"title":"Removal efficiency and microbial community shifts in full-scale versus laboratory-scale bank filtration systems using horizontal collector wells.","authors":"Sang Yeob Kim, Jin Hyung Noh, Minjoo Lee, Joonhong Park, Young Joo Lee, Jeong Joo Park, Heejong Son, Woorim Lee, Feifei Wang, Sung Kyu Maeng","doi":"10.1016/j.jconhyd.2025.104689","DOIUrl":"10.1016/j.jconhyd.2025.104689","url":null,"abstract":"<p><p>Climate-induced changes in dissolved organic matter (DOM) and trace organic contaminants (TrOCs) present growing challenges for drinking water treatment, particularly in surface water-dependent regions. Bank filtration (BF), a natural subsurface treatment process, offers a sustainable solution, but its performance and scalability require further validation. This study simultaneously assesses the performance of laboratory-scale and full-scale BF systems using a horizontal collector well (HCW), both receiving the same source water and aquifer materials, to remove DOM and TrOCs, and to investigate changes in microbial communities under equivalent residence times (20 days). The full-scale HCW system achieved a 63.0 % DOM removal rate compared to 37.0 % in laboratory-scale columns, effectively reducing biopolymers and humic substances through soil passage. Microbial analysis revealed distinct shifts, with Proteobacteria comprising 80.1 % of the full-scale filtrate compared to 59.1 % in the laboratory-scale. Total cell counts and microbial activity decreased by 85.0 % and 90.4 % in the full-scale system, respectively. The removal efficiency for 60 selected TrOCs varied by their properties: hydrophobic ionic compounds achieved high removal (91.2 %), while hydrophilic and neutral compounds, including perfluoroalkyl substances (PFAS), showed lower removal rates (37.3 % and 24.5 %, respectively). Pharmaceuticals, steroid hormones, and pesticides were effectively removed, with some exceeding 99.9 %. This study is the first to directly compare full-scale HCW and laboratory-scale BF systems under controlled conditions. These findings highlight BF's effectiveness and the need for integrating complementary technologies to improve water quality and sustainability.</p>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"275 ","pages":"104689"},"PeriodicalIF":4.4,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144816833","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
Field and laboratory-based evidence of microplastic ingestion by the Asian green mussel, Perna viridis from the northern Malabar coast of India. 来自印度北部马拉巴尔海岸的亚洲绿贻贝(Perna viridis)摄入微塑料的现场和实验室证据。
IF 4.9 3区 环境科学与生态学
Marine pollution bulletin Pub Date : 2025-11-01 Epub Date: 2025-07-23 DOI: 10.1016/j.marpolbul.2025.118468
Chinnu Remanan, Pramila Sahadevan, K V Anju, C S Ankitha, Melbin Lal, V N Sanjeevan
{"title":"Field and laboratory-based evidence of microplastic ingestion by the Asian green mussel, Perna viridis from the northern Malabar coast of India.","authors":"Chinnu Remanan, Pramila Sahadevan, K V Anju, C S Ankitha, Melbin Lal, V N Sanjeevan","doi":"10.1016/j.marpolbul.2025.118468","DOIUrl":"10.1016/j.marpolbul.2025.118468","url":null,"abstract":"<p><p>Microplastic contamination of aquatic fauna, particularly the filter feeding bivalves, is gaining global attention. Ingestion of microplastics by the commercially important Asian green mussel, Perna viridis (Linnaeus, 1758), from a natural mussel bed situated in the northern part of Kerala (southwest coast of India) and the results of experimental ingestion studies using polystyrene microparticles are discussed. Mussel samples from the inter-tidal zones were severely contaminated by microplastics, mainly constituted by fibre/filament, thin films and beads. Polypropylene was identified as the predominant particle type by Fourier transform infrared (FT-IR) spectroscopy. To confirm the ingestion and to track the fate of microplastics in the digestive tract, organisms were fed with orange fluorescent polystyrene beads of 10 μm size along with algal feed at two different experimental concentrations. Short term impacts of exposure in controlled conditions led to abnormal feeding behavior in mussels. Substantial reduction in algal clearance rate and presence of microplastics in faeces and pseudofaeces confirmed the ingestion. Absence of significant differences in microplastic count in soft tissues post depuration implies possible retention of smaller sized particles. Therefore, ingestion experiments involving environmentally relevant concentrations followed by depuration trials, across a range of mariculture species using particles of various types and dimensions may be necessary to establish safety standards for microplastic contamination in seafood.</p>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"220 ","pages":"118468"},"PeriodicalIF":4.9,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144707975","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
Dissolved organic phosphorus utilization and composition under different water regimes of a river-dominated estuary. 河流主导型河口不同水态下溶解有机磷的利用与组成
IF 4.9 3区 环境科学与生态学
Marine pollution bulletin Pub Date : 2025-11-01 Epub Date: 2025-07-23 DOI: 10.1016/j.marpolbul.2025.118481
Xia Zhang, Lijun Cui, Songlin Liu, Yunchao Wu, Jinlong Li, Xiaoping Huang
{"title":"Dissolved organic phosphorus utilization and composition under different water regimes of a river-dominated estuary.","authors":"Xia Zhang, Lijun Cui, Songlin Liu, Yunchao Wu, Jinlong Li, Xiaoping Huang","doi":"10.1016/j.marpolbul.2025.118481","DOIUrl":"10.1016/j.marpolbul.2025.118481","url":null,"abstract":"<p><p>Dissolved organic phosphorus (DOP) has been closely linked to microbial alkaline phosphatases (AP) whose affiliation and diversity is largely unknown in coastal waters. Here we assessed genetic diversity and abundance of bacterial alkaline phosphatases phoD and phosphate transporter phoD and explored how AP activity interacting with them along the salinity gradient of Pearl River Estuary (PRE), which was under heavy anthropogenic pressures. Partial least squares path modeling (PLS-PM) revealed the pathway from environmental variables (pH and salinity) to phoD-harboring bacterial taxa in particle-attached fraction and then to phoD gene copies was the determinant process for AP activity; while AP activity in free-living fraction was mainly controlled by the pathway from dissolved inorganic phosphorus (DIP) to phoD encoding community structure and its gene abundance. Our study highlighted the importance of diverse phoD phosphorus mineralizers, such as some members from Actinobacteria (Actinomadura), Alphaproteobacteria (unclassified Rhodobacteraceae, Roseovarius, Mesorhizobium) and Betaproteobacteria (Ralstonia), while pstS-harboring community was composed of picocyanobacteria. In the outer estuary with the lowest DIP concentration, AP level was activated substantially herein, which corresponded well with the spatial distribution of phoD and pstS gene abundance. High number of phosphatase and transporter genes potentially implied effective hydrolyzation rate of DOP to supplement inorganic phosphorus in the estuary. Researches on the characterization and transformation of DOP are insufficient owing to their complex composition and extraction difficulty. In the recent study, we applied Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) to present a preliminary feature of DOP molecular composition in the PRE. The phosphoesters represented more than 95 % of total DOP, and CHOP compounds (mainly lipids) was a potential substrate for bacterial AP. Our study unveils the key biogeochemical role of AP for mineralizing specific DOP to support more phytoplankton biomass and emphasizes the supervision and management of both DOP and DIP entering the estuaries from land-based sources.</p>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"220 ","pages":"118481"},"PeriodicalIF":4.9,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144707974","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
Chlorophyll a and photosynthetic carbon fixation in a tropical coral reef bay (Sanya Bay) of the northern South China Sea, with special reference to the effects of solar ultraviolet radiation B. 南海北部热带珊瑚礁湾(三亚湾)叶绿素a与光合固碳作用,特别参考太阳紫外线辐射B的影响
IF 4.9 3区 环境科学与生态学
Marine pollution bulletin Pub Date : 2025-11-01 Epub Date: 2025-07-23 DOI: 10.1016/j.marpolbul.2025.118473
Yukun Yao, Yingxin Li, Weihua Zhou, Aimin Long, Xiangcheng Yuan, Tao Li, Sheng Liu, Hui Huang
{"title":"Chlorophyll a and photosynthetic carbon fixation in a tropical coral reef bay (Sanya Bay) of the northern South China Sea, with special reference to the effects of solar ultraviolet radiation B.","authors":"Yukun Yao, Yingxin Li, Weihua Zhou, Aimin Long, Xiangcheng Yuan, Tao Li, Sheng Liu, Hui Huang","doi":"10.1016/j.marpolbul.2025.118473","DOIUrl":"10.1016/j.marpolbul.2025.118473","url":null,"abstract":"<p><p>Sanya Bay is a typical tropical coral reef bay with high water transparency. Solar Ultraviolet Radiation B (UVB) radiation exposure affects phytoplankton primary production, but the understanding of its underlying mechanism is still limited. This study investigated the responses of spatial and seasonal changes of chlorophyll a (Chl a) and phytoplankton photosynthetic carbon fixation to solar UVB in Sanya Bay in 2011. Results showed that Chl a was the highest in autumn and lowest in spring. Surface phytoplankton photosynthetic carbon fixation (SPP) was higher in winter and lower in summer, while water column integrated primary production (IPP) showed little variation among seasons except spring. Overall, Chl a, SPP and IPP all decreased with increasing distance from the shore. UVB inhibited both SPP and IPP throughout the year, with the inhibition ratios (IR) ranging from 32.01 % to 38.88 %. Chl a, SPP and IPP could be affected by the interaction between UVB, nutrient levels, water column stability and light availability. The study highlighted the importance of long-term observation to establish a more comprehensive understanding of the driving mechanism of Chl a and primary productivity in Sanya Bay.</p>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"220 ","pages":"118473"},"PeriodicalIF":4.9,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144707972","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
Corrigendum to "A novel method to assess the dilution of complex mixtures in the marine environment: Application to marine scrubber water effluents" [Mar. Pollut. Bull. (2025) 117956]. “评估海洋环境中复杂混合物稀释的新方法:应用于海洋洗涤器出水”的勘误表[3月污染]。公牛。(2025) 117956)。
IF 4.9 3区 环境科学与生态学
Marine pollution bulletin Pub Date : 2025-11-01 Epub Date: 2025-08-06 DOI: 10.1016/j.marpolbul.2025.118541
Vassilis Zervakis, Vassilis Kolovoyiannis, Loris Calgaro, Elisa Giubilato, Antonio Marcomini, Aikaterini-Anna Mazioti, Christian Ferrarin, Elisa Majamäki, Manos Potiris, Evangelia Krasakopoulou, Elina Tragou, Jaakko Kukkonen, Jukka-Pekka Jalkanen
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