Marine environmental research最新文献

{"title":"Spatial variability of sediment geochemistry and meiofaunal communities in hydrothermal vent fields along the Central Indian ridge","authors":"Ki-Young Choi ,&nbsp;Jun-Mo Jung ,&nbsp;Je-Hyeok Oh ,&nbsp;Hye-Eun Kim ,&nbsp;Hae-San Gu ,&nbsp;A-young Shin ,&nbsp;Dongsung Kim ,&nbsp;Dokyun Kim ,&nbsp;Yeon-Su Kim ,&nbsp;Chang-Joon Kim","doi":"10.1016/j.marenvres.2025.107371","DOIUrl":"10.1016/j.marenvres.2025.107371","url":null,"abstract":"<div><div>This study investigates the geochemical composition and meiofaunal communities in deep-sea hydrothermal vent sediments along the Central Indian Ridge (CIR). Our analysis focused on five vent fields: Onnuri, Onnare, Onbada, Invent E, and Kairei. Sediment analysis revealed spatial variation in heavy metal concentrations, with Onnare and Onbada exhibiting particularly high levels of As, Cd, Pb, Hg, Cu, and Zn. Meiofaunal abundance was highest at Invent E and was dominated by nematodes, whereas lower abundance was associated with sites exhibiting elevated metal concentrations. Principal component analysis and hierarchical cluster analysis identified Fe, Zn, As, Cd, Hg, and Co as key factors affecting the meiofaunal distribution and grouped stations based on their geochemical profiles. These findings demonstrate that sediment geochemistry plays a critical role in structuring benthic communities in deep-sea vent systems. They provide a crucial foundation for understanding ecological responses to natural geochemical gradients along the CIR and offer insights to guide future monitoring of hydrothermal ecosystems under environmental change.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"211 ","pages":"Article 107371"},"PeriodicalIF":3.0,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144680470","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 persistent high-chlorophyll turbid zone off the west coast of Hainan Island, China","authors":"Peng Bai ,&nbsp;Yan Pan ,&nbsp;Jianbo Guo ,&nbsp;Bo Li ,&nbsp;Qiong Wu ,&nbsp;Qiying Wang ,&nbsp;Ying Gao","doi":"10.1016/j.marenvres.2025.107369","DOIUrl":"10.1016/j.marenvres.2025.107369","url":null,"abstract":"<div><div>Chlorophyll-a (Chl-a) and total suspended sediments (TSS) are globally critical tracers in marine biogeochemistry, decoding ecological health, carbon dynamics, and planetary-scale material fluxes. This study investigates the persistent high-chlorophyll turbid zone off the west coast of Hainan Island, China, integrating satellite observations and high-resolution numerical modeling. Results reveal a year-round high Chl-a (1.49–2.53 mg/m³) and TSS (2.45–6.32 mg/L) zone within the 50 m isobath, contrasting sharply with the oligotrophic central Beibu Gulf. Tidal mixing, quantified by the Simpson parameter log (h/u³), drives vertical entrainment of nutrient-rich bottom waters and resuspension of coarse sediments, sustaining phytoplankton productivity and turbidity. Seasonal variability in TSS exhibits a “W-shaped” pattern, characterized by peak concentrations in winter, followed by secondary elevated levels in summer, with the lowest values observed during spring and autumn, aligning with wave mixing intensity modulated by monsoon winds. Enhanced winter mixing coincides with peak Chl-a and TSS, while summer coastal upwelling, previously attributed to tidal front-induced secondary circulation, is re-evaluated as a direct outcome of tidal mixing. Furthermore, ENSO phases regulate TSS anomalies via wind-wave interactions: anti-cyclonic wind stress curl anomaly over the South China Sea during El Niño weakens northeasterly winds, reducing wave energy and TSS, while cyclonic wind anomaly during La Niña enhances both. This work highlights tidal mixing as the primary driver of the persistent high-chlorophyll turbid zone, while wave mixing plays a significant modulating role, with implications for understanding coastal productivity and sediment dynamics under climatic oscillations.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"211 ","pages":"Article 107369"},"PeriodicalIF":3.0,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144655885","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":"Effects of water mass dynamics on the structure and distribution of fish egg community in Daya bay","authors":"Sifan Wang ,&nbsp;Fengxia Wu ,&nbsp;Xiuyu Gong ,&nbsp;Huaxue Liu ,&nbsp;Yiyong Rao ,&nbsp;Shufei Zhang ,&nbsp;Gang Hou ,&nbsp;Honghui Huang","doi":"10.1016/j.marenvres.2025.107339","DOIUrl":"10.1016/j.marenvres.2025.107339","url":null,"abstract":"<div><div>Hydrographic characteristics and water mass changes are essential for understanding fish egg distribution and for the protection and management of marine ecosystems. In this study, four cruises were conducted in May (spring), July (summer), September (fall), and December (winter) of 2022 to investigate early fish resources and environmental characteristics in Daya Bay waters. The K-means clustering algorithm was employed to classify water masses in Daya Bay, and the distribution patterns of temperature and salinity, along with their seasonal variations, were systematically analyzed. Additionally, based on the classification of water masses, we compared fish egg communities between seasons and water mass regions to examine the structure of fish egg communities under different hydrographic conditions. The main findings of this study were as follows: in the present study, 51 fish egg species were identified, belonging to six orders, 22 families and 35 genera. The number of fish egg species ranged from high to low was spring, summer, autumn and winter, while the average abundance ranged from high to low was spring, summer, winter and autumn. The K-means clustering method was utilized to classify Daya Bay into coastal water mass (CWM), nuclear power plant warming water mass (NWWM), high salinity water mass (HSW) outside Daya Bay, mixed water mass (MWM) and Pearl River dilution water mass (PRDWM). By integrating salinity and water temperature data, we identified associations between fish eggs and specific water masses. The mean abundance of fish eggs was highest in thermal discharge from nuclear power plants during spring and autumn; in seasonally mixed water during summer; and in littoral water of the Bay during winter. These results indicate that the thermal discharge from nuclear power plants has had specific effects on the water masses in the adjacent sea areas, forming a distinct oceanic water temperature fronts. This may played a positive impact on the spawning and nursing of some fish species, facilitating the recruitment of fish resources in Daya Bay.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"211 ","pages":"Article 107339"},"PeriodicalIF":3.0,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144680468","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":"Pre-existing seawater drives CO2 sources in reef-building coral habitats—a case study in Dongshan coral nature reserve, China","authors":"Xu Dong ,&nbsp;Baohong Chen ,&nbsp;Weili Wang ,&nbsp;Jianjia Wang ,&nbsp;Xinqing Zheng","doi":"10.1016/j.marenvres.2025.107361","DOIUrl":"10.1016/j.marenvres.2025.107361","url":null,"abstract":"<div><div>In reef-building coral habitats, the balance of community organic and inorganic carbon metabolisms can either create an oceanic sink or source of atmospheric CO₂. However, researchers often overlook how pre-existing seawater—oceanic water that may be out of equilibrium with atmospheric CO₂ before entering the reef system—affects reef system carbon pattern assessments. This study shows that the Dongshan coral habitat acts as an atmospheric CO₂ source during our observations in the summers of 2022 and 2024. Through quantitative analysis of CO₂ source drivers, we found that this primarily results from pre-existing seawater already releasing CO₂, potentially amplified by external biological processes before reaching the reef system. In contrast, the balance of reef community metabolism has less impact on this dynamic and functions primarily as a carbon sink. Additionally, we found that major environmental changes—such as increased seawater turbidity or decreased chlorophyll levels—could transform this balance from a carbon sink into a source, leading to increased CO₂ evasion. Our study highlights that pre-existing seawater plays a crucial role in shaping the CO₂ source characteristics of Dongshan coral habitats, largely masking whether the reef system itself functions as a sink or source of CO₂.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"210 ","pages":"Article 107361"},"PeriodicalIF":3.0,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144633263","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":"Chronic LDPE microplastic ingestion: oxidative stress and mutagenicity in reef fish Stegastes fuscus","authors":"Thalles da Silva-Pinto ,&nbsp;Bruna Beatriz Ferreira ,&nbsp;Jessica Ferreira de Souza ,&nbsp;Augusto Monteiro de Souza ,&nbsp;Marie-Laure Bégout ,&nbsp;Xavier Cousin ,&nbsp;Ana Carolina Luchiari","doi":"10.1016/j.marenvres.2025.107362","DOIUrl":"10.1016/j.marenvres.2025.107362","url":null,"abstract":"<div><div>Plastic waste is a global concern, with annual plastic production expected to surpass 600 megatons by 2030 if current trends persist. Despite being produced on land, most plastic and microplastics (MP) debris ultimately accumulates in aquatic environments, where reef ecosystems are particularly vulnerable. Here, we investigated the consequences of chronic Low-Density Polyethylene (LDPE) MPs ingestion by the damselfish <em>Stegastes fuscus</em>, a key reef species that shapes habitat structure and community dynamics. Fish were fed a diet containing 1 % (w/w) spherical LDPE-MPs (4–6 μm) (n = 12) or plain food (control, n = 12) for 4 months. Behavioural endpoints (locomotion and aggressiveness) were) unaffected by LPDE-MPs. However, MP ingestion increased the frequency of nuclear abnormalities in erythrocytes, and elevated reactive oxygen species (ROS) levels as well as superoxide dismutase (SOD) and catalase (CAT) activity in brain. Our results indicated that chronic ingestion of LDPE-MPs induces genotoxicity and oxidative stress in <em>S. fuscus</em>. These findings underscore that chronic LDPE-MP ingestion directly threatens the survival and welfare of reef fish, with potential cascading effects on reef ecosystem stability. In nature, MPs can adsorb additional contaminants, further amplifying the toxic effects, disrupting reef fish population and ecosystem balance. Thus, urgent strategies to reduce marine plastic pollution are critical to safeguarding coral reef ecosystems.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"211 ","pages":"Article 107362"},"PeriodicalIF":3.0,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144655883","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":"Assembly processes of fish communities on estuarine and oceanic beaches along the Brazilian coast using taxonomic and functional ß-diversity","authors":"Francisco Gerson Araújo,&nbsp;Wagner Uehara,&nbsp;Márcia Cristina Costa de Azevedo,&nbsp;Gustavo Henrique Soares Guedes","doi":"10.1016/j.marenvres.2025.107360","DOIUrl":"10.1016/j.marenvres.2025.107360","url":null,"abstract":"<div><div>Understanding how deterministic niche (traits and environment-driven) and stochastic neutral (randomness and dispersal-driven) processes shape communities is essential for predicting biodiversity. We investigated taxonomic and functional β-diversity in fish assemblages from oceanic and estuarine beaches along the Brazilian coast to test assembly processes. We hypothesized that: (H1) Community assembly varies latitudinally, influenced by temperature, regional factors, and beach type. Niche processes are expected to dominate in estuarine beaches due to environmental gradients, while neutral processes should prevail on oceanic beaches where physical and chemical conditions are more stable and connectivity with the sea is higher; <strong>(</strong>H2) Niche processes dominate in the Transition and Warm Temperate regions, where steeper environmental gradients are present. In contrast, neutral processes prevail in the Tropical region, driven by temperature stability and greater species dispersal. Using Mantel tests and null model simulations, we found that niche-based processes predominated at latitudinal scale in both beach types, partially rejecting H1. High taxonomic turnover and functional nestedness indicate species replacement with reduced functional diversity. Oceanic beaches, characterized by high water dynamism, showed niche-driven patterns based on β-diversity components. In estuarine beaches, strong local environmental gradients drove niche-based turnover, although nestedness suggested some neutral influence. At regional scale, niche processes were stronger in oceanic beaches of the Transition and Warm Temperate regions, while neutral dynamics dominated in the Tropical region, supporting H2. In estuarine beaches, niche-based processes predominated regionally, though less intensely. These findings show that niche and neutral processes jointly shape fish communities, varying by region and habitat, and underscore the need for region-specific conservation strategies. Estuarine beaches require protection for disturbance-sensitive species, while oceanic beaches benefit from maintaining connectivity. Niche-driven communities are more vulnerable to local impacts, whereas neutral-driven ones are more resilient but still rely on dispersal. Effective coastal management should prioritize connectivity in tropical regions and focus on local conditions and habitat diversity in temperate and transitional zones, supporting targeted, evidence-based conservation under climate and human pressures.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"210 ","pages":"Article 107360"},"PeriodicalIF":3.0,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144633265","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":"Habitat distribution and driving mechanisms of Portunus trituberculatus across different life history stages in the southern Bohai Sea","authors":"Jilong Chen ,&nbsp;Xiangshi Shao ,&nbsp;Fan Li ,&nbsp;Xiaomin Zhang","doi":"10.1016/j.marenvres.2025.107347","DOIUrl":"10.1016/j.marenvres.2025.107347","url":null,"abstract":"<div><div>Globally, sustainable management of economically important marine species necessitates a comprehensive understanding of their habitat requirements across all life stages. The swimming crab, <em>Portunus trituberculatus</em>, a vital fishery resource in East Asian coastal waters (e.g., the Bohai Sea), exemplifies species facing intense exploitation and environmental change. This study aimed to elucidate the ontogenetic shifts in habitat suitability for <em>P. trituberculatus</em> and to identify the key environmental drivers influencing its distribution across larval, juvenile, adult, and ovigerous stages. Integrating extensive trawl survey data (2011–2024) with multi-source environmental variables, we utilized an ensemble species distribution modeling approach. Our findings reveal distinct ecological niches: larval distribution was primarily governed by phosphate concentration and water velocity, aligning high-suitability zones with nutrient-rich estuarine areas. Adult habitats shifted towards preferences for specific salinity-velocity synergies, while large adults aggregated in areas with stable thermohaline conditions in central Laizhou Bay. Notably, ovigerous females exhibited strong thermal constraints, resulting in a substantial contraction (e.g., 53.2 % reduction compared to non-ovigerous individuals) of their suitable habitat. This study elucidates the ecological basis of spatial resource heterogeneity in <em>P. trituberculatus</em> from a habitat suitability perspective. The results provide critical scientific foundations for optimizing stock enhancement programs and designing dynamic conservation strategies for this species and offer transferable insights for the adaptive management of other heavily utilized bay ecosystems globally.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"210 ","pages":"Article 107347"},"PeriodicalIF":3.0,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144611783","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":"Turning up the heat: Differential responses of blue mussels (Mytilus edulis) in Atlantic Canada to thermal stress","authors":"Shelby B. Clarke ,&nbsp;Eric H. Ignatz ,&nbsp;Tiago S. Hori ,&nbsp;Luc A. Comeau ,&nbsp;Ramón Filgueira","doi":"10.1016/j.marenvres.2025.107356","DOIUrl":"10.1016/j.marenvres.2025.107356","url":null,"abstract":"<div><div>As waters warm with climate change, it is important to comprehend the risk that mussels will face from exposure to elevated temperatures and understand the traits that enhance their fitness and survival under such conditions. Sober Island Pond in Nova Scotia (NS), Canada, is a shallow inlet that experiences limited water exchange between the pond and the open ocean, exposing mussels to anomalously high summer temperatures. Comparatively, St. Peter's Bay in Prince Edward Island (PEI) is a larger coastal inlet with stronger water exchange with the ocean, and mussels are exposed to relatively cooler temperatures. The objective of this study was to compare the thermal biology of two sources of mussels from Atlantic Canada, Sober Island Pond, NS and St. Peter's Bay, PEI. Mussels were held under three temperatures (20, 25, and 30 °C), and four metrics were used to characterize their thermal biology: (1) lethal thermal threshold (LT₅₀), (2) oxygen consumption rate, (3) valve gaping behaviour, and (4) RNA sequencing (RNA-seq). Results showed differences in the physiological, behavioural, and genomic responses between mussel sources, with individuals from Sober Island Pond, NS, outperforming individuals from St. Peter's Bay, PEI, under elevated temperatures. The RNA-seq identified putative biomarkers of temperature resilience and generated lists of thousands of differentially expressed transcripts to characterize the response to heat stress, which has applications to the development of selective breeding programs. This study highlights the potential for diverse responses to future climatic scenarios in mussels from different thermal environments, which could have ecological and socio-economic implications.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"211 ","pages":"Article 107356"},"PeriodicalIF":3.0,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144672544","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":"Environmental effects on cephalopod community structure and distribution on the eastern Bering Sea upper continental slope","authors":"Shengyu Xiang ,&nbsp;Pengchao Jin ,&nbsp;Jie Cao ,&nbsp;Wei Yu","doi":"10.1016/j.marenvres.2025.107353","DOIUrl":"10.1016/j.marenvres.2025.107353","url":null,"abstract":"<div><div>The eastern Bering Sea upper continental slope (EBSS) is highly productive and abundant in fishery resources, and it is also a key sensitive area to climate change. Cephalopods are widely distributed in this region, but there is still a significant lack of research on their species in EBSS, especially in terms of the impact of climate driven changes in the marine environment on their spatiotemporal distribution. As a key component of the marine food web and a valuable fisheries resource, cephalopods are highly sensitive to environmental changes. Utilizing survey data from the Alaska Fisheries Science Center (AFSC), we investigated the community structure and spatial and temporal distributions of three cephalopod species on the EBSS, and the relationship between catch-per-unit-effort (CPUE) and depth, sea bottom temperature (SBT), and sea surface temperature (SST) using a generalized additive model (GAM). Furthermore, a habitat suitability index (HSI) model was used to evaluate the effects of regional environmental variations on the habitat distribution of dominant cephalopod species during marine heatwaves (MHWs). The results revealed a diverse cephalopod community on the EBSS comprising 20 species (3 orders, 9 families, and 15 genera) including 12 species of Teuthoidea, 7 species of Octopoda, and 1 species of Sepioidea. Depth had the greatest influence on the three dominant species (<em>Berryteuthis magister</em>, <em>Enteroctopus dofleini</em>, and <em>Opisthoteuthis californiana</em>), followed by SBT and SST. MHWs contributed to marine environmental changes, which, in turn, affected the CPUE of the dominant cephalopod species. Compared to the 2010 MHW, the anomalous warming of the seawater during 2016 caused a reduction in the suitable habitat distribution for <em>B. magister</em>, while increasing suitable habitats for <em>E. dofleini</em> and <em>O. californiana</em>, and thus, increasing cephalopod abundance.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"210 ","pages":"Article 107353"},"PeriodicalIF":3.0,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144604418","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":"Combined effects of ocean acidification and warming on phytoplankton productivity and community structure in the coastal water of Southern East","authors":"Yukun Zhang ,&nbsp;John Beardall ,&nbsp;Kunshan Gao","doi":"10.1016/j.marenvres.2025.107352","DOIUrl":"10.1016/j.marenvres.2025.107352","url":null,"abstract":"<div><div>Progressive global ocean changes, including ocean acidification and warming, are expected to impact ecosystems differentially due to regional environmental differences that govern biogeochemical and ecological processes. In this study, we investigated the impacts of ocean acidification and warming on the phytoplankton community and primary productivity in the southern coastal water of the East China Sea by running land-based mesocosms controlled under current atmospheric <em>p</em>CO₂ (∼430 μatm) and projected levels for the year 2100 (∼1000 μatm, HC, High CO₂) at 27 °C (ambient) and 30 °C (warming, HT, High Temperature). Our results indicate that warming, acidification, and their combined effects (HCHT) initially enhanced community biomass as determined by chl <em>a</em> concentration; however, this effect diminished over time, ultimately resulting in lower biomass density compared to the control in later stages. Primary productivity per volume of seawater in the HT and HCHT treatments was initially suppressed but increased in the later stages compared to the control group, whereas the HC treatment appeared to suppress it consistently. While higher effective photochemical efficiency and non-photochemical quenching coincided with higher photosynthetic carbon fixation per chlorophyll <em>an</em> under the HT and HCHT treatments, their decline under the HC after the acclimation was concurrent with decreased photosynthetic carbon fixation. Analysis of 18S rDNA revealed that diatoms and dinoflagellates dominated under the treatments of HC, HT, and HCHT, but compared to the control, the proportion of diatoms decreased by 23 %, 14 %, and 6 %, while that of dinoflagellates increased by 19 %, 9 %, and 11 %, respectively, under the corresponding treatments. Plankton richness increased under warming, while diversity declined, particularly with combined warming and acidification, highlighting community sensitivity to the stressors. With reference to heterotrophic microbes, the relative abundance of <em>Basidiomycota</em> increased by 16 %–18 % under HT or HCHT, along with insignificant impacts on prokaryotic communities based on 16S rDNA analysis. In conclusion, the combination of ocean acidification and warming treatment during the experimental period ultimately reduced the phytoplankton biomass density and altered the microbial community structure.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"210 ","pages":"Article 107352"},"PeriodicalIF":3.0,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144614641","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}