Marine environmental research最新文献

{"title":"Long-term trends and anthropogenic forcing of surface ocean carbon storage and acidification.","authors":"Wei-Bo Chen","doi":"10.1016/j.marenvres.2025.107606","DOIUrl":"https://doi.org/10.1016/j.marenvres.2025.107606","url":null,"abstract":"<p><p>This study investigates long-term trends and anthropogenic influences on surface ocean carbon storage and acidification across the global ocean during 1985-2022, using a high-resolution (0.25° × 0.25°) product reconstructed by a neural-network framework from the Copernicus Marine Service. Global and regional trends in dissolved inorganic carbon (DIC), total alkalinity (TA), pH, surface partial pressure of CO₂ (spCO₂), and air-sea CO₂ flux (fgCO₂) were quantified using linear regression, Mann-Kendall tests, and Sen's slope estimator. Results reveal a significant global DIC increase of 0.75 ± 0.015 μmol kg^-1 yr^-1, corresponding to an annual carbon sink of ∼2.0 PgC yr^-1, alongside a pH decline of -0.00164 ± 0.000034 units yr^-1, indicating intensified acidification. The fgCO₂ rose from 0.32 to 0.72 mol C m^-2 yr^-1, reflecting a strengthened carbon sink (from 1.2 to 2.6 PgC yr^-1), with a temporary decline during 2021-2022 linked to reduced emissions during the COVID-19 pandemic. Spatial analyses highlight pronounced DIC and fgCO₂ increases in the North Atlantic and Southern Ocean, contrasted by persistent CO₂ outgassing in equatorial regions. Spearman's rank correlations and Bai-Perron breakpoint analyses identify structural shifts in carbon dynamics, particularly in 1997-1998 and 2012-2013, associated with accelerated anthropogenic forcing. Declining TA:DIC ratios signal a weakening of oceanic buffering capacity, raising concerns about the future efficiency of marine carbon sequestration. These findings underscore the ocean's critical role in mitigating atmospheric CO₂, while revealing its increasing vulnerability to sustained anthropogenic pressures.</p>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"107606"},"PeriodicalIF":3.2,"publicationDate":"2025-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145280318","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":"Intensive mariculture shifts microbial communities and life-history strategies in the semi-enclosed bay: Case study in Sansha Bay, China","authors":"Haizhou Li ,&nbsp;Hui Gao ,&nbsp;Shuo Chen ,&nbsp;Xinran Li ,&nbsp;Jin Zhou","doi":"10.1016/j.marenvres.2025.107607","DOIUrl":"10.1016/j.marenvres.2025.107607","url":null,"abstract":"<div><div>Coastal bays often experience significant disturbances from various mariculture activities, frequently leading to severe eutrophication. Yet, the ecological consequences of nutrient inputs derived from mariculture on bay-associated microbial communities remain insufficiently understood. Sansha Bay, known as the world's largest cage mariculture site for <em>Larimichthys crocea</em>, represents a characteristic semi-enclosed bay commonly utilized for studying the environmental impacts of intensive mariculture. In this study, we compared the highly eutrophic Sansha Bay with the relatively undisturbed natural East China Sea to investigate how intensive mariculture influences the bay microbial biosphere, focusing on community composition, assembly mechanisms, functional profiles, and life-history strategies. Amplicon sequencing and metagenomic analyses showed that Sansha Bay had a greater proportion of fast-growing microorganisms, nitrogen and carbon cycling microbes, and antibiotic-resistant bacteria. Null model analysis indicated that while natural coastal microbial assemblages were predominantly shaped by stochastic processes, deterministic selection became increasingly prominent as mariculture activities intensified. Correspondingly, microbial life-history traits, including 16S rRNA gene copy number, codon usage bias, predicted maximum growth rates, genome size, guanine-cytosine content, transposase abundance, and niche breadth, were consistently elevated in the eutrophic bay. These results suggest that eutrophication associated with mariculture drives a shift in life-history strategies from oligotrophs (<em>K</em>-strategists) to copiotrophs (<em>r</em>-strategists). Collectively, this study yields novel mechanistic understanding of how intensive mariculture reshapes microbial community structures, laying the groundwork for forecasting changes in coastal ecosystems subjected to ongoing human disturbances.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"213 ","pages":"Article 107607"},"PeriodicalIF":3.2,"publicationDate":"2025-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145271466","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":"Seawater quality criteria derivation and ecological risk assessment for tris (2-chloroisopropyl) phosphate in China","authors":"Yanxin Qiao ,&nbsp;Zhengyan Li ,&nbsp;Teng Wang ,&nbsp;Xiaoying Cui","doi":"10.1016/j.marenvres.2025.107610","DOIUrl":"10.1016/j.marenvres.2025.107610","url":null,"abstract":"<div><div>Tris(2-chloroisopropyl) phosphate (TCIPP), a widely used organophosphorus flame retardant, is being increasingly detected in coastal marine environment. However, its ecological risk assessment is rarely conducted due to insufficient toxicity data. To address this gap, this study screened existing marine toxicity values of TCIPP and supplemented toxicity tests on eight marine species to enrich the dataset. Short-term and long-term seawater quality criteria (WQC) were consequently derived as 0.731 mg/L and 0.0330 mg/L, respectively, through the species sensitivity distribution (SSD) methodology. Ecological risk of TCIPP was assessed with both the hazard quotient (HQ) and joint probability curve (JPC) methods. Both approaches indicated a currently low ecological risk of TCIPP in marine environment, with the HQ values of below 0.01 and the overall risk probability (ORP) of below 2 %. This study provides scientific basis for the water quality standards and ecological risk management of this emerging pollutant.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"213 ","pages":"Article 107610"},"PeriodicalIF":3.2,"publicationDate":"2025-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145271461","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":"Monothalamous foraminifera are useful bioindicators for DNA-based benthic monitoring of North Sea offshore platforms","authors":"Ngoc-Loi Nguyen ,&nbsp;Fabrizio Frontalini ,&nbsp;Vincent M.P. Bouchet ,&nbsp;Kristina Cermakova ,&nbsp;Thomas Merzi ,&nbsp;Jan Pawłowski","doi":"10.1016/j.marenvres.2025.107608","DOIUrl":"10.1016/j.marenvres.2025.107608","url":null,"abstract":"<div><div>Benthic foraminifera are widely recognized as excellent bioindicators for assessing the Ecological Quality Status (EcoQS) of marine environments. However, most of the current foraminiferal biomonitoring is based on hard-shelled taxa. Here, we analyze soft-walled monothalamous foraminifera in sedimentary environmental DNA metabarcoding data to assess the EcoQS and the response of the benthic community to impacts associated with the activity of an offshore platform in the North Sea, based on two-year sampling campaigns. Our results confirm the dominance of monothalamids in the metabarcoding data and indicate that their diversity tends to increase with distance from the platform. We also calibrated and tested an ecological index based on foraminiferal ecological indices, foram-gAMBI, to assess the EcoQS. The foram-gAMBI is significantly and strongly correlated to most metals, hydrocarbons (r = 0.74–0.92, <em>p</em> &lt; 0.05), and moderately correlated with organic matter (r = 0.48–0.55, <em>p</em> &lt; 0.05). The correlation values are higher than those found for the macrofauna-based AMBI and nematode-gAMBI, supporting the higher sensitivity of foram-gAMBI to environmental stress. The EcoQS assignment based on four ecological indices shows a very high agreement and consistency among them. The classification of stations into three impact classes according to selected environmental variables (Ba, Zn, Cu, THC) allows the identification of some monothalamids as indicators of high or low impact. Our study provides new evidence of the usefulness of foraminiferal metabarcoding for monitoring anthropogenic impacts and highlights the need to include monothalamids among foraminiferal bioindicators.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"213 ","pages":"Article 107608"},"PeriodicalIF":3.2,"publicationDate":"2025-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145271465","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":"Remote sensing technologies for monitoring coral reef health under climate change.","authors":"Ricky Anak Kemarau, Wee Hin Boo, Nurul Asyiqin Abu Bakar, Zulfaqar Sa'adi, Zaini Sakawi, Muhammad Ammar Fakhry Norzin, Wan Shafrina Wan Mohd Jaafar, Stanley Anak Suab, Oliver Valentine Eboy, Noorashikin Md Noor","doi":"10.1016/j.marenvres.2025.107599","DOIUrl":"https://doi.org/10.1016/j.marenvres.2025.107599","url":null,"abstract":"<p><p>Climate change-driven coral bleaching is the most acute and visible threat to coral reefs, which support biodiversity, coastal protection, and human livelihoods. Yet monitoring remains uneven across space, depth, and time. This review evaluates the performance and limitations of satellite- and UAV-based remote sensing for bleaching detection and outlines pathways toward operational, management-ready monitoring. Using a PRISMA-guided synthesis of 1995-2024 peer-reviewed studies, we compare multispectral platforms (Sentinel-2, Landsat, MODIS) with hyperspectral and UAV systems in terms of spectral sensitivity, spatial resolution, revisit frequency, and validation practices. Sentinel-2 and Landsat enable basin-to regional-scale assessments, while MODIS provides essential thermal context but limited habitat detail. Hyperspectral and UAV approaches can detect early and sublethal bleaching signals but remain underutilized, appearing in fewer than 15 % of studies. Persistent geographic biases-particularly the underrepresentation of Southeast Asia, mesophotic reefs, and high-latitude systems-restrict global understanding, while weak standardization hampers comparability across studies. Multi-sensor fusion of thermal and optical data, coupled with water-column correction and machine learning, substantially improves attribution between heat exposure and benthic change but requires coordinated protocols and robust ground-truthing. Future progress will depend on targeted deployment of UAV and hyperspectral assets, standardized validation, and open, interoperable monitoring pipelines that connect near-real-time thermal alerts with fine-scale benthic diagnostics.</p>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"107599"},"PeriodicalIF":3.2,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145280518","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":"Fate analysis of heavy metals and hydrophobic organic pollutants in tidal flow wetlands: Insights for pollution-specific ecological remediation strategies","authors":"Yang Yu ,&nbsp;Juan-Ying Li ,&nbsp;Si-Xiu Long ,&nbsp;Yan-Hong Cai ,&nbsp;Bang-Ping Deng ,&nbsp;Chun-Yi Zhong ,&nbsp;Qian Wang","doi":"10.1016/j.marenvres.2025.107602","DOIUrl":"10.1016/j.marenvres.2025.107602","url":null,"abstract":"<div><div>Coastal wetlands play a critical role in modulating biogeochemical cycles and attenuating anthropogenic pollutants. However, limited attention has been paid to quantifying the efficacy of wetlands in intercepting upstream pollutants. In this study, lab-scale tidal flow wetlands (TFWs) simulating the hydrodynamic conditions of the Shanghai Nanhui Dongtan Wetland (NDW) were established to evaluate the synergistic removal efficiency of diverse contaminants. Results indicated exceptional composite pollutant removal capacities: chemical oxygen demand (COD_Mn: 0.45 g/m²/d), total nitrogen (TN: 0.38 g/m²/d), total phosphorus (TP: 0.051 g/m²/d), lead (Pb: 3.50 mg/m²/d), cadmium (Cd: 0.71 mg/m²/d), Σpolycyclic aromatic hydrocarbons (ΣPAHs: 1023.64 μg/m²/d), and Σbisphenol analogs (ΣBPs: 404.60 μg/m²/d). Behavior analysis demonstrated that substrate adsorption (63.18 %) dominated the removal of heavy metals (HMs), while biodegradation (62.15–70.86 %) was identified as the primary pathway for the removal of hydrophobic organic compound (HOCs). The introduction of iron-modified biochar significantly increased the abundance of <em>Altericroceibacterium</em>, <em>Arcobacter</em>, and <em>Methylophaga</em>, with these genera exhibiting specific degradation capabilities for HOCs in TFWs. Meanwhile, plant uptake (7.58–11.94 %) and benthic bioaccumulation (4.07–5.21 %) emerged as non-negligible pathways for HMs and HOCs. Therefore, substrate modification should be prioritized for HM-dominated scenarios in NDW remediation, while substrate modification could be coupled with <em>Scirpus mariqueter</em> planting in HOC-dominated scenarios. The Level IV fugacity model can accurately predict the partitioning of different pollutants across sediment-water-plant-biota phases. However, the amendment of iron-modified biochar elevated sediment-water partition coefficients (Ks), thereby underestimating the substrate-associated HMs. Similarly, root-induced “iron plaques” increased aquatic plant bioaccumulation factors (K_G), resulting in underestimated concentrations of HOCs in aquatic plants. These discrepancies emphasized the need for parameter optimization in hydrodynamic-ecological coupled models.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"213 ","pages":"Article 107602"},"PeriodicalIF":3.2,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145271464","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":"Biochemistry of Arctic kelp specimens is conditioned by the local environment.","authors":"Sarina Niedzwiedz, Clara Voigt, Sebastian Andersen, Nora Diehl, Raphaëlle Descôteaux, Børge Damsgård, Kai Bischof","doi":"10.1016/j.marenvres.2025.107604","DOIUrl":"https://doi.org/10.1016/j.marenvres.2025.107604","url":null,"abstract":"<p><p>Climate change causes temperature and light to change drastically in Arctic fjords, being the main drivers for ecosystem-engineering seaweeds (kelps; Laminariales, Phaeophyceae). Climate projections on kelps are often based on static performance curves, treating species as one homogenous unit with similar tolerances within their entire biogeographical range. This might lead to mis-extrapolations. We assessed how Arctic kelp specimens are conditioned by their specific in-situ environment. Therefore, we sampled Saccharina latissima sporophytes from eight fjords along the west coast of Svalbard, Norway. Analysing their biochemical response variables (pigment content and composition; antioxidative activity; total carbon and nitrogen content), we found a distinct clustering of the biochemical composition of S. latissima, which correlated significantly with their environment. S. latissima responded strongly to changes in run-off induced turbidity, i.e., light availability. High light availability correlated with a significant reduction of photosynthetic pigments indicating high light protection. Nevertheless, the kelps' total carbon content increased. The kelps' total nitrogen content increased with increasing turbidity, which might be a response to nutrients being washed into the fjord by run-off. We found no stress response to suboptimal temperatures (3 °C vs. 7 °C). This is a further indication of the importance of light as a driver for high-latitude kelp populations, and the necessity to include it in climate projections. In conclusion, we found a high site-specific plasticity of Arctic S. latissima sporophytes. This has to be considered when projecting the responses of kelps towards climatic changes and local management activities.</p>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"107604"},"PeriodicalIF":3.2,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145275143","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":"Characterisation of the gut microbiome and surveillance of antibiotic resistance genes in green sea turtles (Chelonia mydas).","authors":"Dawood Ghafoor, Orachun Hayakijkosol, Noppadol Prasetsincharoen, Carla C M Chen, Muhammad Noman, Poommate Chomchat, Robert Kinobe","doi":"10.1016/j.marenvres.2025.107605","DOIUrl":"https://doi.org/10.1016/j.marenvres.2025.107605","url":null,"abstract":"<p><p>Green sea turtles (Chelonia mydas) are globally endangered marine herbivores that maintain the health of seagrass and coastal ecosystems. Their populations are declining due to human activities, including environmental pollution, which can disrupt gut microbial communities and compromise nutrition, immunity, and overall health. In this study, cloacal swabs from 139 green sea turtles categorised as captive juveniles, captive adults and wild stranded animals in the Gulf of Thailand, were analysed via shotgun metagenomic sequencing to elucidate bacterial taxonomic diversity and ARG profiles. In captive juveniles, Pseudomonadota was the most abundant phylum, followed by Ascomycota and Basidiomycota. In captive adults, Pseudomonadota exhibited an even greater predominance, with only minor contributions from unclassified bacteria and other taxa. In wild stranded green sea turtles, Pseudomonadota was dominant in their gut microbiome, but this was accompanied by notable levels of Actinomycetota, Bacteroidota, and Bacillota. Stranded turtles exhibited highest microbial diversity and variability, while captive adult turtles showed the lowest. Resistome profiling also revealed significant differences in the relative abundance of antibiotic resistance genes across all three groups. MacB (macrolide resistance) was the most abundant gene overall, with the highest abundance observed in juveniles (4.8 %). Stranded turtles exhibited elevated levels of TetA(58) (tetracycline resistance, 2.6 %) and msbA (nitroimidazole resistance, 2.2 %), while adults showed the greatest enrichment of Ecol_fabG_TRC (triclosan resistance, 3.8 %) and TxR (tetracycline resistance, 3.6 %). These data demonstrate that marked variability existed in the gut microbiome and resistome of green sea turtles across different life stages in captive or wild environments. This offers critical insights for the development of targeted conservation strategies and health management practices for both wild and captive green sea turtles. Strategies to mitigate the spread of antibiotic resistance should be developed.</p>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"107605"},"PeriodicalIF":3.2,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145274911","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":"Distinct adaptation strategies and functional potentials of abundant and rare prokaryotes across seasonal dynamics and long-term eutrophication in Xiangshan Bay.","authors":"Hongjing Luo, Kunpeng Xie, Fengyuan Zhang, Zhen Bao, Shuo Ren, Qingxi Han, Dandi Hou, Demin Zhang, Zheng Gong, Huajun Zhang","doi":"10.1016/j.marenvres.2025.107600","DOIUrl":"https://doi.org/10.1016/j.marenvres.2025.107600","url":null,"abstract":"<p><p>Effects of coastal water eutrophication on prokaryotic communities have been intensively elucidated. However, an adaptation of abundant taxa (AT) and rare taxa (RT) of prokaryotes to long-term eutrophic conditions remains unclear. In this study, community compositions, co-occurrence patterns, assembly mechanisms, and functional potentials of AT and RT in a eutrophic bay were compared across four seasons. Alpha diversity indices of AT and RT exhibited opposite correlations with the eutrophication index. The community compositions of both AT and RT were significantly influenced by environmental factors, particularly temperature and nutrient availability. RT were observed to be more sensitive to eutrophication and showed stronger correlations with biotic factors. Both the assembly mechanisms of AT and RT were more strongly influenced by stochastic processes, but deterministic processes increased progressively in AT from spring to winter. The roles of AT and RT varied significantly in co-occurrence networks, with AT playing a more crucial role in spring and RT being more significant in winter. The functional potential of RT showed clearer seasonal patterns than AT, suggesting a more significant contribution of RT to functional redundancy. These findings highlight the divergence between AT and RT prokaryotes in response to eutrophication, enhancing our understanding of the mechanisms underlying microbial community succession in long-term eutrophic waters.</p>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"107600"},"PeriodicalIF":3.2,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145274936","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":"Marine biofilm microbial communities on deep-sea moorings as indicators of a changing environment.","authors":"Lidita Khandeparker, Niyati Hede, Dattesh V Desai, Roshan D'Souza, Kaushal Mapari","doi":"10.1016/j.marenvres.2025.107598","DOIUrl":"https://doi.org/10.1016/j.marenvres.2025.107598","url":null,"abstract":"<p><p>Marine biofilms developed on buoys encasing Acoustic Doppler Current Profilers (ADCPs), deployed on deep-sea moorings for current measurements, were characterized for the first time along the continental slope of the west coast (Off Okha, Goa, Kollam) and east coast (Off Vishakhapatnam - Vizag) of India at a depth of ∼150 m over three years. The biofilm community structure and functions were elucidated using next-generation sequencing. High-throughput sequencing revealed spatio-temporal variations in the biofilm communities with site-specific microbial signatures and metabolic functions. Moreover, biofilms from the Bay of Bengal were significantly different from those in the Arabian Sea. Interestingly, Kollam biofilms were characterized by photoautotrophic carbon cycling and dominated by several cyanobacterial communities and purple non-sulfur bacterium, and is the first report of such taxa in marine biofilms at a depth of 150 m. Functional predictions indicated enhanced expression of stress-related pathways in the Vizag and Goa biofilms. Additionally, biofilms from all sites actively contributed to the degradation of carbon, nitrogen, sulfur, and hydrocarbons, highlighting their importance in marine biogeochemical processes. Notably, certain biofilm-forming genera were consistently present across all 3 years at specific sites, indicating ecological resilience and serving as bioindicators of long-term biofilm dynamics. Moreover, the presence of plastic-associated genera (Amphritea, Crocinitomix, Ulvibacter, and Oleiphilus) across several sites reflects the widespread occurrence of plastics in the surrounding marine environment. Emergence of Desulfobacterota post-lockdown in Okha biofilms suggests anthropogenic influence from increased petroleum activity and their role as markers of hydrocarbon contamination. The detection of sulfur-cycling and corrosion-associated taxa (Sulfurovum, Sedimenticola, Photobacterium, Tenacibaculum) suggests a persistent risk of microbially induced corrosion (MIC), potentially compromising the durability of oceanographic instruments/installations. These findings on deep ocean biofilm-forming bacteria not only provide valuable insights into the ecological and biogeochemical capabilities of microbes but also highlight their relevance as site-specific microbial signatures of marine pollution. This research can also aid in developing effective strategies to mitigate biofouling and bio-corrosion on oceanographic instruments.</p>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"107598"},"PeriodicalIF":3.2,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145258653","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}