Marine environmental research最新文献

{"title":"Temporal shifts in diversity and functional traits of free-living nematode associated to Cystoseira","authors":"Amel Hannachi ,&nbsp;Mohamed Allouche ,&nbsp;Ahmed Nasri ,&nbsp;Badreddine Sellami ,&nbsp;Hamouda Beyrem ,&nbsp;Ezzeddine Mahmoudi ,&nbsp;Cristina Gambi ,&nbsp;Roberto Danovaro","doi":"10.1016/j.marenvres.2026.107846","DOIUrl":"10.1016/j.marenvres.2026.107846","url":null,"abstract":"<div><div>This study presents the first comprehensive, year-long assessment of free-living marine nematode assemblages inhabiting Cystoseira-dominated rocky substrates along the Rimel coast (Bizerte, Tunisia). Monthly sampling was conducted from March 2021 to February 2022 to explore both the taxonomic composition and functional trait dynamics of nematodes in response to temporal changes of the environmental conditions. A total of 50 species belonging to 38 genera and 18 families were identified, with <em>Chromadoridae</em> and <em>Linhomoeidae</em> being the most species-rich families. Despite the persistence of a core nematode assemblage, notable temporal changes were observed in both species-rich families and trait composition, particularly during spring (March–May) and summer (June–September) months. Multivariate analyses (nMDS, cluster analysis, and SIMPER) revealed distinct seasonal groupings, with brief periods of ecological turnover detected in April–May and June–July corresponding to short temporal windows during which nematode assemblages undergo rapid compositional and functional change. Functional traits, including feeding groups, tail and amphidial shapes, adult size, and c–p life-history strategies, exhibited significant temporal reorganization, corresponding to seasonally shifts, emergence, or decline of specific traits over time. Opportunistic traits (e.g., cp-2, non-selective deposit (1B) feeders, elongated tails, pocket and spiral amphids) were dominant during spring (April–May) and early autumn (September). In contrast, long-lived, stress-sensitive groups (cp-5) were not present. Although abiotic variables such as temperature, salinity, and oxygen displayed a strong temporal variability, no direct linear correlations with nematode diversity were observed, suggesting that assemblages’ dynamics are shaped by other and complex factors such as macroalgae structure, food sources availability, and colonization processes.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"215 ","pages":"Article 107846"},"PeriodicalIF":3.2,"publicationDate":"2026-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145966457","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}

{"title":"Factors affecting spatial variability in organic carbon storage and sources in an intertidal Halophila beccarii seagrass meadow of the Yifengxi Estuary, Southern China","authors":"Xiaomei Shen ,&nbsp;Yiguo Hong ,&nbsp;Fei Ye ,&nbsp;Jiapeng Wu ,&nbsp;Yu Wang ,&nbsp;Fen Guo ,&nbsp;Hang Wan ,&nbsp;Hongbin Liu","doi":"10.1016/j.marenvres.2026.107841","DOIUrl":"10.1016/j.marenvres.2026.107841","url":null,"abstract":"<div><div>Seagrass meadows are crucial in marine blue carbon storage. However, in subtropical estuaries dominated by small-sized species, their carbon storage capacity tends to be underestimated, and the key drivers of organic carbon (C_org) variability remain poorly understood. To address these issues, we investigated the spatial patterns of blue carbon storage and sediment C_org sources in a subtropical estuarine meadow dominated by the small seagrass Halophila beccarii in the Yifengxi Estuary, China, and identified the primary environmental factors governing its spatial heterogeneity. Our results showed that although the living biomass carbon stock was relatively low (0.028 ± 0.017 Mg C ha⁻¹), consistent with the pioneer traits of Halophila beccarii, the sediment carbon stock in the upper 1 m was substantial (82.41 ± 29.99 Mg C ha⁻¹), with considerable spatial variability (33.57–125.29 Mg C ha⁻¹). Sediment C_org served as a robust indicator of carbon storage, showing positive correlations with multiple carbon metrics. The observed positive correlation with higher salinity and moisture suggests that sediment C_org preferentially accumulates in low-energy, waterlogged environments. Stable carbon isotope analysis and Bayesian mixing model results showed that terrestrial sources constituted the largest proportion of sediment C_org (49.84 ± 23.57 %), followed by seagrass (26.83 ± 21.43 %) and phytoplankton-derived carbon (23.33 ± 19.98 %), with clear spatial and vertical variations. These patterns reflect the combined influence of terrestrial inputs and intrinsic ecological dynamics on the carbon sink function of the meadow. Our findings provide critical biogeochemical insights into the carbon sequestration role of this ecosystem and underscore the need for management strategies that mitigate terrestrial pressures, enhance autochthonous carbon, implement zonal management, and sustain long-term monitoring.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"215 ","pages":"Article 107841"},"PeriodicalIF":3.2,"publicationDate":"2026-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146010821","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}

{"title":"The influence of algae habitat refuge complexity on juvenile fish growth, condition, and survival under the presence or absence of predators","authors":"Hilmar Hinz ,&nbsp;Maria del Mar Gil ,&nbsp;Paula Anglada ,&nbsp;José Maria Disdier ,&nbsp;Olga Reñones ,&nbsp;Gaetano Catanese ,&nbsp;Julia Castro-Fernández ,&nbsp;Antoni Sureda ,&nbsp;Amalia Grau ,&nbsp;Adam Gouraguine ,&nbsp;Joan Moranta","doi":"10.1016/j.marenvres.2026.107844","DOIUrl":"10.1016/j.marenvres.2026.107844","url":null,"abstract":"<div><div>Macrophyte habitats are key for juvenile fish survival in coastal littoral zones, yet they are increasingly degraded by human activities. While macrophytes offer both shelter and food, their protective function may be context-dependent, particularly in relation to predator abundance, which varies with fishing pressure and protection. In protected areas, where predator densities are higher, juvenile fish may face increased risk and rely more on complex habitats for refuge. Despite the potential benefits of structural complexity, studies on its effects on juvenile fish growth, condition, stress, and mortality remain limited.</div><div>This study tested the influence of macrophyte complexity on two Mediterranean fish, <em>Symphodus ocellatus</em> and <em>Diplodus vulgaris</em>, selected for their contrasting habitat preferences, under laboratory conditions. We hypothesized that juveniles would show improved growth, condition, and survival in complex habitats, especially under predator presence.</div><div>Results revealed species-specific responses. <em>S. ocellatus</em>, contrary to expectations, exhibited a slight reduction in body size, likely due to stress-induced physiological changes. However, this size loss was mitigated in structurally complex habitats. Mortality was also lowest in the highest complexity treatment. In contrast, <em>D. vulgaris</em> showed consistent fast growth across treatments, with only tentative effects of habitat complexity. For this species predator presence had a significant negative effect on weight gain in the unvegetated control treatment compared to the high complexity habitat treatment. Biochemical stress indicators supported these patterns. Elevated catalase activity in structurally complex habitats under predator presence, observed in both species, suggests a habitat-mediated physiological stress response. In contrast, the absence of significant differences in superoxide dismutase activity or RNA:DNA ratios across simpler habitats may indicate that stress levels exceeded physiological response limits, resulting in dampened or exhausted enzymatic responses. Circumstantial evidence for this interpretation is provided by the elevated mortality observed in <em>S. ocellatus</em> in no-habitat control treatments and the reduced weight gain in <em>D. vulgaris</em> under predator presence in the same habitat.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"215 ","pages":"Article 107844"},"PeriodicalIF":3.2,"publicationDate":"2026-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145952361","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}

{"title":"Zooplankton trophic dynamics in response to upwelling phases in the eastern arabian sea: Insights from stable isotopes","authors":"Prachi Marathe ,&nbsp;Anil Kumar Vijayan ,&nbsp;B. Bikram Reddy ,&nbsp;C.K. Sherin ,&nbsp;V. Sudheesh","doi":"10.1016/j.marenvres.2026.107838","DOIUrl":"10.1016/j.marenvres.2026.107838","url":null,"abstract":"<div><div>The study investigated the influence of upwelling-driven changes in physicochemical conditions and phytoplankton structure on the carbon (δ¹³C) and nitrogen (δ¹⁵N) stable isotope composition of particulate organic matter (POM) and major zooplankton groups (crustaceans, chaetognaths, and fish larvae) in the eastern Arabian Sea (EAS) during the 2018 summer monsoon (SM). Enhanced upwelling in the early and peak phases stimulated diatom-dominated blooms (73–91 %) resulting in elevated Chl<em>a</em> concentrations (1.39 ± 1.09 and 3.94 ± 3.38 μg L⁻¹). In contrast late-phase upwelling conditions were characterised by a deeper nitracline, leading to a shift towards smaller phytoplankton and dinoflagellates. The δ¹³C of POM (−21.8 ± 1.9 ‰) remained relatively enriched throughout, reflecting a sustained contribution from micro-phytoplankton. In contrast, δ¹⁵N of POM increased during late-monsoon (9.0 ± 2.5 ‰), consistent with nitrogen loss processes under low-oxygen conditions. Zooplankton δ¹³C and δ¹⁵N values exhibited similar phase-dependent pattern, indicating strong coupling with POM. Group-level isotopic signatures and trophic positions (TPs) revealed distinct feeding strategies: crustaceans exhibited herbivorous diets and lower TPs, whereas chaetognaths, and fish larvae occupied higher TPs indicative of carnivory. These findings underscore the dominant role of micro-phytoplankton (diatoms and dinoflagellates) in sustaining a shorter, classical food-chain during upwelling. This study provides the first regional-scale isotopic baseline for the EAS SM, with implications for isoscape development and trophodynamic modelling.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"215 ","pages":"Article 107838"},"PeriodicalIF":3.2,"publicationDate":"2026-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145966454","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}

{"title":"A novel split aptamer–gold nanoparticle colorimetric assay for the rapid detection of Phaeocystis globosa","authors":"Xueyang Tian,&nbsp;Qianyu Liu,&nbsp;Siqi Cheng,&nbsp;Wenqing Chen,&nbsp;Chunyun Zhang,&nbsp;Yuanyuan Wang,&nbsp;Changlu Guo,&nbsp;Guofu Chen","doi":"10.1016/j.marenvres.2026.107835","DOIUrl":"10.1016/j.marenvres.2026.107835","url":null,"abstract":"<div><div><em>Phaeocystis globosa-</em>forming blooms pose serious ecological and economic risks by releasing hemolytic toxins, inducing hypoxia, threatening fisheries, and even obstructing seawater intake in nuclear power plants. Rapid and reliable detection of this alga is therefore critical. Here, a rapid, sensitive, and quantitative visual detection method that is referred to as split aptamer–gold nanoparticle colorimetric assay (SAGCA) was established for <em>P. globosa</em>. For this purpose, a parent aptamer (PAP) (Pg-TA1) against <em>P. globosa</em> was first split into two segments (Pg-SP1 and Pg-SP2) followed by analyzing their synergistic binding efficiency. The results demonstrated that neither Pg-SP1 nor Pg-SP2 alone could recognize target cells. By contrast, Pg-SP1 and Pg-SP2 restored the binding ability comparable to the PAP when they were combined. Subsequently, the binding conditions of the split aptamers were optimized, and a SAGCA detection system based on the split aptamers was established. The detection limit of SAGCA was 2 cells mL⁻¹, with a linear range of 1 × 10¹ cells mL⁻¹–1 × 10⁸ cells mL⁻¹ (<em>R</em>^<em>2</em> = 0.965). SAGCA demonstrated good specificity and strong anti-interference effectiveness. The quantification results of SAGCA were substantially consistent with those from microscopic examination. SAGCA may be used as a good alternative to the microscopy-based detection method for <em>P. globosa</em>, and thus offers an efficient, low-cost way for monitoring other hazardous microalgae.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"215 ","pages":"Article 107835"},"PeriodicalIF":3.2,"publicationDate":"2026-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145977940","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}

{"title":"Impact of Holocene marine transgression and climatic changes on the Moros marsh (western Mediterranean, Spain)","authors":"A.M. Blázquez ,&nbsp;A. Rodríguez-Pérez ,&nbsp;J. Caicedo-Rodríguez ,&nbsp;I. Montoya-Blázquez ,&nbsp;J. Guillem","doi":"10.1016/j.marenvres.2026.107832","DOIUrl":"10.1016/j.marenvres.2026.107832","url":null,"abstract":"<div><div>Coastal wetlands are the most common environments in the Spanish Mediterranean. They provide valuable information about past interactions between sea level fluctuations, climate variability and sediment dynamics, which could enable us to predict the future response of coastal systems to global climate change.</div><div>This study analyses the palaeoenvironmental evolution of the Moros Marsh (Western Mediterranean) during the Holocene, with the aim of assessing the impact of the MIS 1 marine transgression and climate change on the configuration of the wetland during this period. To achieve this goal, 347 samples extracted from four boreholes were studied from a sedimentological, micropalaeontological and chronological perspective.</div><div>The results show a thick alluvial unit at the base of all the boreholes, dated as Middle Holocene, on which brackish marsh facies developed, which later became freshwater. A barrier facies has been detected in the most coastal borehole (Moro 2), with a maximum Holocene transgression (MIS 1) dated around 5200 cal yr BP. The first flooding evidence appears in the innermost borehole (Moro 1) around 3562-3440 cal yr BP and continues to the present day, with episodes of oscillation in the water table related to climatic changes in the Northern Hemisphere. A low-salinity, low-energy environment is determined, with little marine influence and a powerful supply of fresh water from the aquifer.</div><div>This environment is the result of the interaction between eustatic and climatic factors. The former account for the formation of the lagoon system, and the latter are the main controllers of its subsequent evolution.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"215 ","pages":"Article 107832"},"PeriodicalIF":3.2,"publicationDate":"2026-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145966441","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}

{"title":"Quantification of marine cooling effect and driving mechanism along Beibu Gulf coastal areas","authors":"Zhengyu Qin ,&nbsp;Zuofang Yao ,&nbsp;Yuanle Pan ,&nbsp;Fei Yang","doi":"10.1016/j.marenvres.2026.107836","DOIUrl":"10.1016/j.marenvres.2026.107836","url":null,"abstract":"<div><div>Global warming and urbanization have greatly intensified the heat threats to urban residents. Marine cooling effect (MCE) is essential for mitigating urban heat threats in coastal cities, yet there is still big gap of understanding its seasonal dynamics and underlying drivers in subtropical nearshore zones. Taking the Guangxi Beibu Gulf as a case, this study combined multi-temporal Landsat 8 land surface temperature datasets with Spearman correlation, local spatial autocorrelation (LISA), and optimal-parameter geographical detector (OPGD) analyses to quantify MCE, which is indicated by marine cooling intensity (MCI) and marine cooling distance (MCD), and to dissect their spatiotemporal heterogeneity and driving mechanisms. Results reveal distinct seasonal changes regimes. MCI peaked in summer (up to 23.75 °C) and was lowest in autumn, while MCD reached its maximum inland extent in spring (750m). High intensity cooling consistently clustered around coastal port areas and dense gray-space urban core zones, whereas blue-space and green-space-rich zones exhibited weaker cooling. Gray space exerted a persistent positive influence on MCI across seasons (summer q &gt; 0.55), while blue space extended MCD only in spring and green space generally shortened it. Landscape fragmentation (ED, LSI) weakened cooling in most seasons, underscoring the role of spatial continuity in facilitating MCE. Driver interactions varied by season. Blue-gray synergy produced the strongest nonlinear enhancement of MCI year-round (q &gt; 0.60), indicating that mixed land-water configurations sharpen cooling contrasts at the land-sea interface. MCD propagation was governed in spring by blue-building coupling interactions (AI_BS × ABH, q = 0.34), in summer by gray-green coupling interactions (AI_IS × LPI_GS, q = 0.26), and in autumn by more and weaker balanced multi-factor effects. These findings highlight the seasonal shifts in how gray, blue, and green spaces individually and interactively regulate coastal thermal environments. The framework provides transferable metrics for diagnosing and optimizing blue-green-gray spatial patterns in climate adaptive coastal urban planning, with potential to maximize cooling benefits for densely built port cities in subtropical regions.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"215 ","pages":"Article 107836"},"PeriodicalIF":3.2,"publicationDate":"2026-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145978532","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}

{"title":"Multi-omics and stable isotopic reveal coordinated carbon-nitrogen metabolic reprogramming sustaining diatom cellular homeostasis under CO2 limitation","authors":"Haiyue Chen ,&nbsp;Yu Liu ,&nbsp;Guoguang Wang ,&nbsp;Weijia Fan ,&nbsp;Guangzhi Rong ,&nbsp;Haixia Wang","doi":"10.1016/j.marenvres.2026.107843","DOIUrl":"10.1016/j.marenvres.2026.107843","url":null,"abstract":"<div><div>Algal blooms frequently trigger CO₂ limitation, under which diatoms not only survive but dominate. However, the cellular metabolic adaptations underlying this ecological phenomenon remain poorly understood. This study systematically investigated the coordinated carbon-nitrogen metabolic response of the typical diatom <em>Skeletonema costatum</em> (<em>S</em>. <em>costatum</em>) to CO₂ limitation (300 ppm, 100 ppm) via stable isotope and multi-omics analysis. CO₂ limitation triggered the carbon concentrating mechanism (CCM) and attenuated nitrogen isotope fractionation, redirecting carbon flux towards amino acid biosynthesis rather than fatty acid biopathway. Integrated transcriptomic and metabolomic profiling revealed that carbon fixation and the tricarboxylic acid (TCA) cycle were activated, while fatty acid synthesis was inhibited. This redirected carbon skeletons from acetyl-CoA into the TCA cycle to support amino acid production. Concurrent upregulation of nitrogen assimilation genes, particularly those involved in glutamine/glutamate synthesis, facilitated ammonium incorporation. The alanine-aspartate-glutamate pathway served as a central hub, integrating carbon skeletons and amino groups to drive amino acid synthesis and maintain cellular homeostasis. These findings systematically delineate the metabolic reprogramming that enables diatoms to adapt to CO₂ limitation, providing key insights into their dominance during algal blooms.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"215 ","pages":"Article 107843"},"PeriodicalIF":3.2,"publicationDate":"2026-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145926685","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}

{"title":"Atmospheric wet deposition acts as a critical pathway for bioavailable dissolved organic carbon in the Haizhou Bay, South Yellow Sea","authors":"Lei Xie ,&nbsp;Ruotong Yan ,&nbsp;Wei Fang ,&nbsp;Bin Yang ,&nbsp;Renming Jia ,&nbsp;Dongliang Lu ,&nbsp;Bo Yang ,&nbsp;Yuru Yan ,&nbsp;Jiahu Xia ,&nbsp;Jiaodi Zhou ,&nbsp;Haifang Huang ,&nbsp;Zhenjun Kang","doi":"10.1016/j.marenvres.2026.107837","DOIUrl":"10.1016/j.marenvres.2026.107837","url":null,"abstract":"<div><div>Riverine input and atmospheric wet deposition represent significant external sources of dissolved organic matter (DOM) in coastal waters. However, the transformation and fate of these allochthonous DOM following their entry into the marine environment remain poorly understood. To address this knowledge gap, rainwater samples were collected from the Haizhou Bay (HZB), South Yellow Sea, and riverine samples were obtained from the Linhong River, the largest river discharging into the HZB, during summer 2024. The concentrations of dissolved organic carbon (DOC) and the optical properties of DOM in rainwater and river samples were analyzed. Additionally, microbial incubation experiments were performed to assess the bioavailability of DOM originating from different sources in the HZB. The results indicated that the concentrations of DOC, chromophoric DOM (CDOM), and humic-like fluorescent DOM (FDOM) in the river samples were significantly higher than those in the rainwater samples (<em>P</em> &lt; 0.05). Riverine DOM exhibited greater aromaticity, higher humification levels, and larger molecular weight, whereas rainwater DOM showed opposite characteristics. Furthermore, the proportion of bioavailable DOC (BDOC) in rainwater ranging from 40.18 % to 69.77 % (average 53.93 ± 11.48 %), approximately 7.3 times that in river water (7.36 ± 2.55 %). The estimated wet deposition flux of DOC into the HZB in summer was 1662 tons, significantly lower than the river input flux (18821 tons). In contrast, the wet deposition loading of BDOC (896 tons) in summer reached 64.7 % of the riverine input (1385 tons), suggesting that atmospheric wet deposition constitutes a crucial pathway for BDOC in the HZB.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"215 ","pages":"Article 107837"},"PeriodicalIF":3.2,"publicationDate":"2026-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145926687","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}

{"title":"Effect of plant litter burial on soil dissolved organic matter in the Yellow River Delta wetland, China","authors":"Linping Xie ,&nbsp;Yutong Yan ,&nbsp;Min Wang ,&nbsp;Guangang Hu ,&nbsp;Xia Sun ,&nbsp;Jianbu Wang ,&nbsp;Ming Xin ,&nbsp;Qinsheng Wei ,&nbsp;Baodong Wang","doi":"10.1016/j.marenvres.2026.107839","DOIUrl":"10.1016/j.marenvres.2026.107839","url":null,"abstract":"<div><div>Dissolved organic matter (DOM) derived from plant litter frequently regulates the generation and migration of carbon in coastal wetlands and its transport to adjacent waters. To understand the role of salt marsh in regulating organic carbon cycling in coastal wetlands, laboratory incubation was conducted on litter from one woody plant (<em>Tamarix chinensis</em>) and two herbaceous plants (<em>Phragmites australis, Suaeda salsa</em>) from the Yellow River Delta wetland. The net increment of dissolved organic carbon (ΔDOC) and the net total fluorescence intensity (ΔFt) in soil DOM rapidly peaked within 1 week after burial of the plant litter, and then quickly decreased to much lower values and fluctuated with a slightly increasing trend. A large percentage of tryptophan-like proteins in soil DOM were detected in the early stage of incubation, whereas a high percentage of humic-acid-like organics was observed after litter decomposition for 3 months. Leaf litter of <em>T. chinensis</em> with the higher initial quality (e.g., low carbon/nitrogen (N), cellulose/N, and lignin/N ratios), released the maximum amount of DOM, suggesting that woody plant leaf litter has greater potential for releasing organic matter than herbaceous plant litter. This study highlights the significant impacts of salt marsh plant litter decomposition on soil DOM characteristics and its potential contribution to coastal ecosystem.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"215 ","pages":"Article 107839"},"PeriodicalIF":3.2,"publicationDate":"2026-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145917450","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}