Adeline Tauran, Xavier de Montaudouin, Danaé Dubrasquet, Lucille Zaragosi, Benoit Gouillieux, Nicolas Lavesque, Hugues Blanchet
{"title":"Ecological consequences of seagrass decline on macrozoobenthic communities: a case study of a Zostera noltii meadow in Arcachon Bay, France","authors":"Adeline Tauran, Xavier de Montaudouin, Danaé Dubrasquet, Lucille Zaragosi, Benoit Gouillieux, Nicolas Lavesque, Hugues Blanchet","doi":"10.1016/j.marenvres.2026.107857","DOIUrl":"10.1016/j.marenvres.2026.107857","url":null,"abstract":"<div><div>Seagrasses form critical coastal habitats that are experiencing worldwide decline, often resulting in reduced abundance and diversity of associated macrofauna. This study focuses on Arcachon Bay (SW France), a coastal lagoon characterised by an extensive <em>Zostera noltii</em> meadow (40 km<sup>2</sup> in 2019) that has declined by 44 % since 1989. This work aimed to characterise benthic community responses to environmental changes, including seagrass loss, using uni and multivariate analyses of two broad-scale surveys (49 stations) conducted in 2002 and 2023, supplemented by a biennial survey at a single station over 22 years. Results reveal significantly different benthic communities in 2002 and 2023 associated with a significant loss in macrofauna densities, while diversity remained similar. Temporal β-diversity (β<sub>SOR</sub> = 0.65) was primarily due to turnover (species replacement) rather than nestedness (species loss/gain). Five distinct benthic communities were identified, mainly influenced by seagrass biomass, elevation, distance to the ocean and sediment characteristics. The biennial surveys offered additional insights into the temporality of these changes at one station. The combined effect of these modifications and habitat fragmentation on the ecosystem functioning remains to be addressed more specifically.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"215 ","pages":"Article 107857"},"PeriodicalIF":3.2,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146010818","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}
Ning Guo , Wenquan Zhang , Tingting Li , Huameng Ge , Zepeng Zhang , Weizhe Li , Dewi Seswita Zilda , Ocky Karna Radjasa , Bailin Cong , Chengcheng Li , Shenghao Liu
{"title":"Environmental drivers and ecological processes underlying microbial community zonation in deep-sea polymetallic nodule sediments","authors":"Ning Guo , Wenquan Zhang , Tingting Li , Huameng Ge , Zepeng Zhang , Weizhe Li , Dewi Seswita Zilda , Ocky Karna Radjasa , Bailin Cong , Chengcheng Li , Shenghao Liu","doi":"10.1016/j.marenvres.2025.107790","DOIUrl":"10.1016/j.marenvres.2025.107790","url":null,"abstract":"<div><div>Microbial communities are key drivers of ecosystem processes and biodiversity in the deep-sea. However, the mechanisms sustaining the composition and function of microbial communities remain poorly understood in deep-sea polymetallic nodule sediments. Here, we investigated the microbial populations, vertical distribution pattern, and environmental determinants at different depth of sediment cores from the Western Pacific polymetallic nodule region. 16S rRNA gene amplicon sequencing revealed a pronounced vertical stratification in prokaryotic diversity. Alpha diversity is highest in surface sediments and exhibited a marked decline with increasing depth, while significant differences in beta diversity were observed between distinct sediment layers. Surface sediments contained the greatest number of biomarkers and specialized taxa, and also exhibited more complex co-occurrence networks, with a higher proportion of negative associations (15.6%) compared to middle (2.7%) and deep layers (0.5%). Depth was the primary factor structuring prokaryotic communities, followed by TOC, TN, and heavy metals. Interestingly, a small core microbiota, dominated by Chloroflexi, Proteobacteria, Patescibacteria, and Acidobacteriota, was ubiquitous across all layers and constituted the majority (76.4%) of the total community, underscoring the vertical dominance of a few ubiquitous taxa. With increasing depth, microbial systems shift adaptively: their co-occurrence networks become more cooperative and modular while their assembly mechanisms transition from deterministic to stochastic dominance, highlighting a profound ecological shift along the depth gradient. Our findings offer critical baseline insights into microbial communities in polymetallic nodule sediments, informing future environmental impact assessment and ecological restoration of deep-sea mining.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"215 ","pages":"Article 107790"},"PeriodicalIF":3.2,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145789354","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 , Zuofang Yao , Yuanle Pan , 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 > 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 > 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":"2026-03-01","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}
Laxman Pujari , Sujata Nilajkar , Min Wang , Jun Sun
{"title":"The depth code: Deconstructing the molecular architecture of marine protists in a tropical marginal sea","authors":"Laxman Pujari , Sujata Nilajkar , Min Wang , Jun Sun","doi":"10.1016/j.marenvres.2025.107820","DOIUrl":"10.1016/j.marenvres.2025.107820","url":null,"abstract":"<div><div>The Bay of Bengal (BoB) is one of the most stratified and dynamic marginal seas, influenced by monsoonal forcing, riverine freshwater input, and complex hydrography. While the region's physicochemical variability is well studied, the diversity and depth-related structure of marine protist communities remain underexplored, especially in offshore and subsurface waters. In this study, we used high-throughput sequencing of the 18S rRNA V4 region to investigate marine protist diversity across three depths: surface (30m and 75m), mid (100m and 150m), and bottom (300m) at stations spanning northern and southern BoB. Multivariate analyses (RDA and NMDS) revealed distinct vertical community structuring driven by key environmental variables such as temperature, Chl-<em>a</em>, nitrate, salinity, and silicate. Surface communities were dominated by <em>Pelagomonas</em>, <em>Ostreococcus</em>, <em>Bathycoccus</em>, and <em>Chloropicon</em>, associated with warm, high-chlorophyll, oligotrophic surface waters. Mid-depth layers were characterized by a more heterogeneous assemblage, including <em>Cafeteria</em>, <em>Cladococcus</em>, and <em>Caecitellus</em>, indicative of microbial loop activity and particle-associated niches. Bottom depths showed a shift toward functionally distinct taxa such as <em>Chromidina</em>, <em>Icthyodinium</em>, and <em>Auloscena</em>, associated with silicate-rich, low-oxygen, and detritus-rich environments. Network analyses revealed a decrease in co-occurrence complexity with depth but an increase in modularity, reflecting environmental filtering and niche specialization. This study presents one of the first comprehensive vertical profiles of marine protists in the offshore BoB and underscores the importance of integrating molecular and ecological analyses to understand microbial diversity and biogeochemical functioning in tropical stratified oceans.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"215 ","pages":"Article 107820"},"PeriodicalIF":3.2,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145889401","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}
Linping Xie , Yutong Yan , Min Wang , Guangang Hu , Xia Sun , Jianbu Wang , Ming Xin , Qinsheng Wei , Baodong Wang
{"title":"Effect of plant litter burial on soil dissolved organic matter in the Yellow River Delta wetland, China","authors":"Linping Xie , Yutong Yan , Min Wang , Guangang Hu , Xia Sun , Jianbu Wang , Ming Xin , Qinsheng Wei , 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":"2026-03-01","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}
Hyun Soo Choi , Sang Uk Kang , Na Yun Park , Seong-Jun Chun , An Suk Lim
{"title":"Coupling between environmental drivers and microbial networks in shaping marine plankton dynamics","authors":"Hyun Soo Choi , Sang Uk Kang , Na Yun Park , Seong-Jun Chun , An Suk Lim","doi":"10.1016/j.marenvres.2025.107816","DOIUrl":"10.1016/j.marenvres.2025.107816","url":null,"abstract":"<div><div>Marine plankton are ecologically crucial, as they contribute to biogeochemical cycles and food web structure. This study investigated the structure and dynamics of marine plankton communities in relation to local environmental conditions and seasonal changes over 2 years in the coastal regions of Busan, Jinhae, and Masan in South Korea. The results revealed significant variations in the plankton community composition between Jinhae/Masan and Busan, driven by freshwater inputs, temperature fluctuations, and salinity changes. Dinoflagellates predominated the plankton communities of Jinhae and Masan, whereas high abundances of diatoms, cyanobacteria, and cryptophytes were found in Busan. In addition, seasonal dynamics were observed in microbial abundances, with cyanobacteria and diatoms predominating during summer when water temperatures were elevated, and two distinct blooms occurring in winter. The plankton community correlated with environmental variables and organisms, resulting in either co-clustering or niche segregation. Additionally, bacterioplankton and phytoplankton formed complex networks with each other. Our findings emphasize the interplay between abiotic and biotic factors in shaping plankton community structures and underscore the need for comprehensive studies integrating environmental monitoring with analyses of interspecies interactions. This research enhances our understanding of the dynamic changes in marine plankton communities and provides a valuable basis for future marine ecosystem management.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"215 ","pages":"Article 107816"},"PeriodicalIF":3.2,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145842065","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}
Fernanda C. de Oliveira-Carlos , Pedro Augusto dos Santos Longo , Jorge L. Gutiérrez , Cinthya Simone Gomes Santos , Andre R. Senna , Guilherme H. Pereira-Filho
{"title":"The rolling stones' legacy: Rhodoliths retain their habitat function after algal death","authors":"Fernanda C. de Oliveira-Carlos , Pedro Augusto dos Santos Longo , Jorge L. Gutiérrez , Cinthya Simone Gomes Santos , Andre R. Senna , Guilherme H. Pereira-Filho","doi":"10.1016/j.marenvres.2025.107809","DOIUrl":"10.1016/j.marenvres.2025.107809","url":null,"abstract":"<div><div>Rhodoliths - unattached calcareous nodules formed by coralline red algae - can persist on the seafloor long after algal death, creating structural legacies that shape benthic communities. To test whether dead rhodoliths differ from living ones in their habitat function for macroinvertebrates, we conducted a 35-day recolonization experiment using living rhodoliths cleared of macroinvertebrates (“living” treatment), rhodoliths experimentally killed and cleared by boiling (“dead” treatment), and unmanipulated living rhodoliths as controls. Across treatments, 122 macroinvertebrate taxa were recorded. Overall density, richness, and diversity did not differ significantly among treatments. Assemblages in living and dead rhodoliths were statistically indistinguishable, while both differed slightly from controls, although such differences accounted for less than 9 % of total variation. Taxon-specific contrasts contributed little to dissimilarities, with no single species explaining more than 3 % of variation. These findings indicate that the calcareous structure of rhodoliths provides a lasting habitat function, sustaining macroinvertebrate communities even after algal death. Recognition of the ecological role of dead rhodoliths emphasizes that rhodolith beds should not be considered “dead systems,” even when dominated by non-living nodules. Their likely centennial - to millennial - scale persistence highlights their long-term contributions to habitat complexity and biodiversity support, while also underscoring their vulnerability to destructive human activities such as trawling and seabed mining.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"215 ","pages":"Article 107809"},"PeriodicalIF":3.2,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145827790","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}
Yuanqin Xu , Ping Li , Jie Liu , Wei Gao , Wenjie Yu , Yao Zhang , Somkiat Khokiattiwong , Narumol Kornkanitnan
{"title":"Corrigendum to “Sources of organic carbon and environmental response characteristics in the mangrove region of Trat Province, Thailand, over the past 1,019 years” [Mar. Environ. Res. 213 (2026) 107628]","authors":"Yuanqin Xu , Ping Li , Jie Liu , Wei Gao , Wenjie Yu , Yao Zhang , Somkiat Khokiattiwong , Narumol Kornkanitnan","doi":"10.1016/j.marenvres.2025.107772","DOIUrl":"10.1016/j.marenvres.2025.107772","url":null,"abstract":"","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"215 ","pages":"Article 107772"},"PeriodicalIF":3.2,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145774965","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}
Weinan Li , Edward A. Laws , Luping Song , Yichong Wang , Zengchao Xu , Chao Xu , Yibin Huang , Feipeng Xu , Lizhen Lin , Wupeng Xiao , Xin Liu , Haili Wang , Bangqin Huang
{"title":"Driving mechanisms of distinct seasonal phytoplankton dynamics in a low-latitude basin revealed by multi-platform observations","authors":"Weinan Li , Edward A. Laws , Luping Song , Yichong Wang , Zengchao Xu , Chao Xu , Yibin Huang , Feipeng Xu , Lizhen Lin , Wupeng Xiao , Xin Liu , Haili Wang , Bangqin Huang","doi":"10.1016/j.marenvres.2025.107785","DOIUrl":"10.1016/j.marenvres.2025.107785","url":null,"abstract":"<div><div>Phytoplankton forms the foundation of marine food webs, and their seasonal dynamics shape ocean ecosystem functioning and carbon cycling. In low-latitude basins such as the South China Sea (SCS), these dynamics have traditionally been regarded as stable and primarily controlled by warm-cold seasonal oscillations, often evaluated using single metrics such as chlorophyll-<em>a</em> concentration. However, this paradigm fails to capture the significant regional heterogeneity within a single basin and the complex, sometimes contradictory, responses of different phytoplankton community parameters. To address this, we conducted a comprehensive analysis of a 20-year multi-platform dataset (remote sensing, ship-based, and Biogeochemical-Argo) to reveal how regional physical processes drive the seasonal dynamics of phytoplankton chlorophyll-<em>a</em>, community composition, and primary production in the basin of SCS. In the northern basin, winter monsoon coupling with strong Kuroshio intrusion elevated surface chlorophyll-<em>a</em> by 200 % compared to summer, yet contributed only 31.2 % to the annual primary production, revealing a significant decoupling driven by light limitation and low-temperature suppression of photosynthesis. In the southwestern basin, summer upwelling stimulated diatom blooms and sustained primary production comparable to its winter levels. Niche models confirmed that regional physical processes (Kuroshio intrusion vs. upwelling) select for distinct phytoplankton assemblages within the basin. We conclude that regional physical forcing, rather than basin-wide monsoon seasonality alone, is the primary driver of phytoplankton dynamics and carbon cycling in this low-latitude basin, supplementing the traditional seasonal oscillation paradigm for such systems.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"215 ","pages":"Article 107785"},"PeriodicalIF":3.2,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145789269","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}
Junhui Wu , Ruixue Cao , Qibin Lao , Guangzhe Jin , Xuan Lu , Chunqing Chen , Fajin Chen , Shuwen Zhang
{"title":"Hydrodynamic processes and their impact on eutrophication in two distinct types of bays near the Beibu Gulf coast: insight from dual water isotopes","authors":"Junhui Wu , Ruixue Cao , Qibin Lao , Guangzhe Jin , Xuan Lu , Chunqing Chen , Fajin Chen , Shuwen Zhang","doi":"10.1016/j.marenvres.2026.107840","DOIUrl":"10.1016/j.marenvres.2026.107840","url":null,"abstract":"<div><div>Quantitative understanding of hydrodynamic processes and nutrient supply in different types of small bays remains limited. By combining water isotopes, hydrological parameters, and nutrient analysis, our findings revealed that Qinzhou Bay (a bay with multiple riverine inputs) is significantly influenced by coastal diluted water (49 %), while Tieshangang Bay (a bay without riverine input) is mainly influenced by high-salinity seawater outside the bay (61 %) during the early rainy season. However, despite these differences, Tieshangang Bay receives a greater proportion of nutrient supply from diluted water (69–95 %) compared to Qinzhou Bay (58–87 %). This disparity is related with the higher seawater intrusion into the Tieshangang Bay, which creates an internal salinity front that inhibits nutrient diffusion outside the bay. The barrier effect of the front hinders the expansion of terrestrial nutrients out of the bay, and accumulates in the bay, exacerbating the seawater eutrophication in the inner Tieshangang bay. This results in a significantly higher degree of eutrophication in Tieshangang Bay compared to Qinzhou Bay. Our study provides valuable insights into the hydrodynamic processes and their impact on eutrophication in different types of bays, emphasizing the importance of the existence of rivers for nutrient transport in small bays.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"215 ","pages":"Article 107840"},"PeriodicalIF":3.2,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145926686","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}