Frontiers in Marine Science最新文献

{"title":"Exploring FTAs, seafood exports, and SDGs: a gravity model analysis of Pakistan’s seafood trade with China and regional partners","authors":"Yuxiang Xia, Hengbin Yin, Muhammad Mohsin, Ana Mehak, Cai Yan","doi":"10.3389/fmars.2025.1553780","DOIUrl":"https://doi.org/10.3389/fmars.2025.1553780","url":null,"abstract":"This study examines the effects of Free Trade Agreements (FTAs) on Pakistan’s seafood exports, specifically analyzing the China-Pakistan Free Trade Agreement (CP-FTA) and its stages, CP-FTAI and CP-FTAII. Using the gravity model (GM) of trade, it empirically analyzes the dynamics of seafood trade between Pakistan and its neighboring countries, aiming to provide insights into improving trade balance and export performance. The study employs three econometric approaches—Ordinary Least Squares (OLS), Fixed Effects Model (FEM), and Pseudo Poisson Maximum Likelihood (PPML) to ensure the robustness and reliability of the findings. The results reveal that Pakistan’s seafood exports are significantly influenced by FTAs, particularly with Afghanistan, Sri Lanka, and Malaysia, while CPFTA-I shows a positive impact. However, CPFTA-II exhibit negative and insignificant relationship, indicating that external shocks, like the COVID-19 pandemic, have impacted trade dynamics. The results of this study are significantly relevant to multiple United Nations Sustainable Development Goals (SDGs). Notably, they contribute to SDG 8, which focuses on Decent Work and Economic Growth, by promoting trade-driven economic advancement. Furthermore, they support SDG 9, which pertains to Industry, Innovation, and Infrastructure, by facilitating infrastructure development through the China-Pakistan Economic Corridor (CPEC). Additionally, they align with SDG 12, which emphasizes Responsible Consumption and Production by advocating sustainable trade practices. The study recommends enhancing FTAs, improving infrastructure, and expanding trade with neighboring markets to optimize Pakistan’s seafood export potential. Policymakers should focus on strengthening trade agreements, streamlining logistics, and integrating variables like security and exchange rates to develop more resilient and sustainable trade strategies, contributing to important SDGs.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"2 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143813433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"TCCFNet: a semantic segmentation method for mangrove remote sensing images based on two-channel cross-fusion networks","authors":"Lixiang Fu, Yaoru Wang, Shulei Wu, Jiasen Zhuang, Zhongqiang Wu, Jian Wu, Huandong Chen, Yukai Chen","doi":"10.3389/fmars.2025.1535917","DOIUrl":"https://doi.org/10.3389/fmars.2025.1535917","url":null,"abstract":"Mangrove ecosystems play a crucial role in coastal environments. However, due to the complexity of mangrove distribution and the similarity among different categories in remote sensing images, traditional image segmentation methods struggle to accurately identify mangrove regions. Deep learning techniques, particularly those based on CNNs and Transformers, have demonstrated significant progress in remote sensing image analysis. This study proposes TCCFNet (Two-Channel Cross-Fusion Network) to enhance the accuracy and robustness of mangrove remote sensing image semantic segmentation. This study introduces a dual-backbone network architecture that combines ResNet for fine-grained local feature extraction and Swin Transformer for global context modeling. ResNet improves the identification of small targets, while Swin Transformer enhances the segmentation of large-scale features. Additionally, a Cross Integration Module (CIM) is incorporated to strengthen multi-scale feature fusion and enhance adaptability to complex scenarios. The dataset consists of 230 high-resolution remote sensing images, with 80% used for training and 20% for validation. The experimental setup employs the Adam optimizer with an initial learning rate of 0.0001 and a total of 450 training iterations, using cross-entropy loss for optimization. Experimental results demonstrate that TCCFNet outperforms existing methods in mangrove remote sensing image segmentation. Compared with state-of-the-art models such as MSFANet and DC-Swin, TCCFNet achieves superior performance with a Mean Intersection over Union (MIoU) of 88.34%, Pixel Accuracy (PA) of 97.35%, and F1-score of 93.55%. Particularly, the segmentation accuracy for mangrove categories reaches 99.04%. Furthermore, TCCFNet excels in distinguishing similar categories, handling complex backgrounds, and improving boundary detection. TCCFNet demonstrates outstanding performance in mangrove remote sensing image segmentation, primarily due to its dual-backbone design and CIM module. However, the model still has limitations in computational efficiency and small-target recognition. Future research could focus on developing lightweight Transformer architectures, optimizing data augmentation strategies, and expanding the dataset to diverse remote sensing scenarios to further enhance generalization capabilities. This study presents a novel mangrove remote sensing image segmentation approach—TCCFNet. By integrating ResNet and Swin Transformer with the Cross Integration Module (CIM), the model significantly improves segmentation accuracy, particularly in distinguishing complex categories and large-scale targets. TCCFNet serves as a valuable tool for mangrove remote sensing monitoring, providing more precise data support for ecological conservation efforts.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"183 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143813441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Harnessing the value of near-term actions for achieving climate-ready fishery management","authors":"Michael Drexler, Elizabeth B. Cerny-Chipman, Megan J. Peterson Williams, Meredith Moore, Corey Ridings","doi":"10.3389/fmars.2025.1558251","DOIUrl":"https://doi.org/10.3389/fmars.2025.1558251","url":null,"abstract":"Climate change requires managers to bolster long-term resilience of fisheries and concurrently improve short-term responsiveness of management systems to prevailing ecological conditions, all while avoiding unintended harm to stocks in a highly uncertain context. There has been substantial effort dedicated to developing the scientific information and tools needed to inform climate-ready fisheries, yet implementation of these approaches has been limited in the United States management system. Meanwhile, climate impacts on fisheries are already occurring, making fish and fishing communities highly vulnerable to sudden, and often detrimental, changes. There is a need to accelerate adaptation efforts, and near-term action is critical even without the full complement of information and tools in hand. Here, existing climate-ready approaches were compiled and synthesized to offer a comprehensive and structured perspective on priority actions that can be taken in the next 1-2 years to increase the resilience and adaptability of fish stocks and communities that rely on them. From the review there are three main findings: 1) 45% of the management actions can be implemented in this short timeframe, 2) Nearly all actions identified can be implemented in the current fishery and regulatory framework, and 3) While new approaches are needed, managers should proceed with caution to avoid maladaptation and choose a no- or low- maladaptation risk approach wherever possible.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"108 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143813432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Anchored Argo profiling float experiments in the southern Baltic Sea: Puck Bay and Hel Peninsula","authors":"Małgorzata Merchel, Waldemar Walczowski, Piotr Wieczorek","doi":"10.3389/fmars.2025.1569261","DOIUrl":"https://doi.org/10.3389/fmars.2025.1569261","url":null,"abstract":"This article presents the results of three experiments conducted in 2022–2023 using an Argo autonomous profiling float anchored to the seabed with a thin line. The aim of the study was to prevent the float from drifting in order to perform measurements in a precisely defined location. The experiments were carried out in the Baltic Sea - in Puck Bay and the vicinity of the Hel Peninsula. Puck Bay, a shallow and sheltered body of water with a unique and sensitive ecosystem, provided an excellent location for testing the method under calm conditions. In contrast, the northern areas of the Hel Peninsula, exposed to strong currents and high waves, allowed for the evaluation of the method’s effectiveness in more dynamic conditions. The results of the experiments demonstrated that anchoring the Argo float is effective in shallow and sheltered waters with low wave activity and weak currents, such as Puck Bay. However, in the more challenging environment of the Hel Peninsula, the method proved to be less effective, indicating its limitations in harsher environmental conditions. Standard Argo floats, which are most often deployed in deeper parts of the Baltic Sea, provide limited data from shallow-water areas, particularly those near the coast and in enclosed waters such as lagoons and bays. The introduction of anchored Argo floats could complement the existing network of drifting floats, ensuring better coverage of shallow-water areas and improving the quality of marine environmental monitoring.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"34 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143805831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Deep learning-driven 3D marine nitrate estimation: uncertainty mitigation through underwater signal exploitation and label augmentation","authors":"Xiang Yu, Guodong Fan, Jinjiang Li","doi":"10.3389/fmars.2025.1576558","DOIUrl":"https://doi.org/10.3389/fmars.2025.1576558","url":null,"abstract":"Nitrate is a critical limiting nutrient that significantly influences marine primary productivity and carbon sequestration. However, three-dimensional observation and reconstruction of oceanic nitrate remain constrained by the scarcity of <jats:italic>in-situ</jats:italic> data and limited spatial coverage. To address the challenge of limited observational labels hindering the development of global deep learning models for marine three-dimensional estimation, this study proposes a novel deep learning framework that utilizes underwater signals for label augmentation, thereby reducing the uncertainty in three-dimensional nitrate estimation. Initially, we employ a Bayesian neural network, utilizing multiple subsurface parameters from Biogeochemical-Argo (BGC-Argo) measurements to generate virtual nitrate labels with quantified uncertainty. These augmented labels are then assimilated into a U-Net-based model, greatly expanding the training dataset and further integrating sea surface environmental variables for comprehensive three-dimensional reconstruction. The proposed uncertainty-weighted loss function refines model training, balancing the quality and training impact of both observed and augmented labels. Quantitative evaluations using BGC-Argo and cruise measurement data demonstrate notable improvements in spatial and temporal generalization, with RMSE reductions of approximately 15% and 28%, respectively, particularly in under-sampled areas and complex upper ocean regions. This research framework offers a promising solution for oceanic three-dimensional data reconstruction in the absence of supervised data and has the potential to be coupled with various marine parameters and reconstruction models, providing deeper insights into the spatiotemporal variations of marine environments.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"24 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143805833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of primary production and net ecosystem metabolism on carbon and nutrient cycling at the land-sea interface","authors":"Louise C. V. Rewrie, Burkard Baschek, Justus E. E. van Beusekom, Arne Körtzinger, Wilhelm Petersen, Rüdiger Röttgers, Yoana G. Voynova","doi":"10.3389/fmars.2025.1548463","DOIUrl":"https://doi.org/10.3389/fmars.2025.1548463","url":null,"abstract":"Estuaries are typically net heterotrophic systems and a source of CO<jats:sub>2</jats:sub> to the atmosphere, while continental shelves are net CO<jats:sub>2</jats:sub> sinks. Yet, primary production and net ecosystem metabolism (NEM) are variable, and this has implications for nutrient and carbon processing along the land-sea interface. To resolve this variability, high-frequency dissolved oxygen and ancillary biogeochemical data from a research station (FerryBox) located at the outflow of a temperate estuary into a shelf sea, were used to quantify the gross primary production (GPP) and NEM at the land-sea interface. In early and mid-spring in the outer Elbe Estuary (Germany), we find that low GPP rates (155 ± 46 mg C m<jats:sup>-2</jats:sup> d<jats:sup>-1</jats:sup> in April 2020 and 74 ± 24 mg C m<jats:sup>-2</jats:sup> d<jats:sup>-1</jats:sup> in March to April 2021) were light limited, as a function of elevated turbidity (31 ± 9 NTU and 35 ± 7 NTU) and solar irradiance. When turbidity decreased in late spring (May), we observed elevated GPP rates, and highest GPP rates in summer (June-August), with seasonal averages of 613 ± 89 mg C m<jats:sup>-2</jats:sup> d<jats:sup>-1</jats:sup> in 2020 and 558 ± 77 mg C m<jats:sup>-2</jats:sup> d<jats:sup>-1</jats:sup> in 2021. Primary production in the outer Elbe Estuary waters was not nutrient-limited, since concentrations all year-round exceeded the expected limiting levels of 5 µM Si, 0.5 µM PO<jats:sub>4</jats:sub><jats:sup>3-</jats:sup> and 2 µM NO<jats:sub>3</jats:sub><jats:sup>-</jats:sup>. Despite the high nutrient concentrations and estimated GPP rates, the system was in near trophic balance, with seasonally averaged NEM estimates of -2 ± 49 mg C m<jats:sup>-2</jats:sup> d<jats:sup>-1</jats:sup> and -149 ± 41 mg C m<jats:sup>-2</jats:sup> d<jats:sup>-1</jats:sup>. A significant finding is that a seasonal decrease in dissolved inorganic carbon of 125 – 160 µmol kg<jats:sup>-1</jats:sup> from May to September, and in total alkalinity of 116 – 128 µmol kg<jats:sup>-1</jats:sup> from December to August, was likely driven by the concurrent and significant seasonal uptake of inorganic carbon by primary producers in the upper estuary and upstream regions. This highlights the heterogeneity of inorganic carbon patterns along the land-sea continuum and the continuity of biogeochemical processing in the upstream regions of a temperate estuary to sea.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"183 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143805830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Distribution and biodiversity of benthic macroalgae in the Nanji Islands, China","authors":"Xin Wang, Shangwei Xie, Wandong Chen, Xiaopin Ni, Wantao Xu, Qijun Luo, Haimin Chen","doi":"10.3389/fmars.2025.1563252","DOIUrl":"https://doi.org/10.3389/fmars.2025.1563252","url":null,"abstract":"IntroductionThis study focuses on the benthic macroalgae of the Nanji Islands, China, aiming to assess species diversity and biomass through a combination of qualitative and quantitative approaches using historical data.MethodsWe conducted a comprehensive survey of the benthic macroalgae, employing species identification and biomass estimation techniques across different seasons and tidal zones. Co-occurrence network analysis was used to explore species interactions and ecosystem stability. Historical data were compared to recent monitoring results to evaluate the impacts of marine reserves.ResultsA total of 127 species were identified, with Rhodophyta being the dominant group (57.48%), exhibiting remarkable ecological adaptability. Seasonal variation in biomass showed peaks in spring (1344.31 g·m⁻²) and the lowest in autumn (428.78 g·m⁻²). The mid/low-tide zones supported 2.6 times higher biomass than the high-tide zones. The southern communities demonstrated increased stability, with a co-occurrence network of 129 nodes and 999 edges. Biomass recovery of 61.14% was observed at key monitoring sites since the establishment of protected areas in 1990.DiscussionOur findings emphasize the crucial role of marine reserves in reversing biodiversity loss and maintaining ecosystem health. The observed biomass recovery and species diversity restoration in protected areas underscore the effectiveness of these conservation strategies. The study also provides valuable insights into the distribution patterns of benthic macroalgae, highlighting the significance of seasonal and tidal zone influences on biodiversity and biomass.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"43 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143805832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dual advancement of marine economic growth and environmental governance: an empirical analysis of China’s Marine Economic Development Pilot Zones","authors":"Zhiyong Song, Zechen Li, Yipin Zhang","doi":"10.3389/fmars.2025.1497895","DOIUrl":"https://doi.org/10.3389/fmars.2025.1497895","url":null,"abstract":"IntroductionThis research aims to empirically investigate the dual effects of establishing the Marine Economic Development Pilot Zone (MEDPZ) on marine economic growth and environmental governance. The study focuses on China’s coastal provinces, where MEDPZs have been implemented, to assess their impacts on both economic and environmental aspects.MethodsThe study employs a Time-varying difference-in-differences (DID) model based on panel data from China’s coastal provinces. This method allows for assessing the causal impact of MEDPZ establishment on marine economic growth and environmental governance by comparing pilot provinces with non-pilot provinces over time.ResultsThe establishment of MEDPZ has significantly enhanced marine economic growth and environmental governance in the pilot provinces. Specifically, marine economic growth increased by 1.222 percentage points, while environmental governance improved by 0.748. Additionally, the impact of MEDPZ establishment varied spatially across different marine economic circles. The northern marine economic circle experienced the most substantial economic growth and environmental governance benefits. The southern marine economic circle saw a significant increase in economic growth but a relatively minor improvement in environmental governance. In contrast, the eastern marine economic circle was not substantially affected.DiscussionThe findings suggest that the establishment of MEDPZ has effectively boosted the competitiveness of the marine economy in pilot provinces while mitigating adverse environmental impacts. This is achieved through promoting scientific and technological advancement and strengthening government regulation. The study provides a scientific basis for policymakers to formulate and implement marine economic development strategies that consider regional differences, enhance financial support for marine science and technology R&amp;amp;D, and enforce stricter regulations for marine environmental protection.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"64 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143790103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparison of elemental composition and 87Sr/86Sr-143Nd/144Nd between fossil and modern fish teeth and the significance of the enrichment of REE in deep-sea sediments","authors":"Zhijie Xu, Xiaoyu Zhang, Kongyang Zhu, Mu Huang, Miao Yu, Zheng Li, Zhongrong Qiu, Yanfang Lu","doi":"10.3389/fmars.2025.1534727","DOIUrl":"https://doi.org/10.3389/fmars.2025.1534727","url":null,"abstract":"Fossil fish teeth are important carriers of rare earth elements (REEs) in deep-sea sediments. Meanwhile, <jats:sup>87</jats:sup>Sr/<jats:sup>86</jats:sup>Sr-<jats:sup>143</jats:sup>Nd/<jats:sup>144</jats:sup>Nd in these fossils have been widely used in paleoceanography. However, when and how REEs enter the fish teeth remains ambiguous, which hinders elucidating the enrichment mechanism of REEs in deep-sea sediments, and the effectiveness of <jats:sup>87</jats:sup>Sr/<jats:sup>86</jats:sup>Sr-<jats:sup>143</jats:sup>Nd/<jats:sup>144</jats:sup>Nd in paleoceanography is doubted. This study examined the contents of REEs, major and trace elements, and <jats:sup>87</jats:sup>Sr/<jats:sup>86</jats:sup>Sr-<jats:sup>143</jats:sup>Nd/<jats:sup>144</jats:sup>Nd in modern fish teeth and in fossil fish teeth from deep-sea sediments. The results indicated that elemental geochemical properties and a redox environment are the main factors controlling their enrichment process in fish teeth. At least three categories of trace elements are classified during two different stages (physiological process of living fish and post-deposition of fossils): (1) elements of Type I mainly belong to IA, IIA, IIIA, IVA, and transition group with active chemical properties, entering into the fish teeth during life; (2) Type II represents elements from the IA, VA, transition elements, and Actinides groups, and are enriched uninterruptedly from the living fish teeth to the post-deposition fossils with variable valences under different redox conditions; (3) Type III are elements accumulated only after deposition under oxidizing or suboxidizing and are members of Lanthanides and rare dispersed elements groups with a large atomic radius and strong chemical activity. The distinctly different enrichment processes of Sr and Nd, <jats:sup>87</jats:sup>Sr/<jats:sup>86</jats:sup>Sr, and <jats:sup>143</jats:sup>Nd/<jats:sup>144</jats:sup>Nd in fossil fish teeth may represent different material sources and should be cautiously employed in paleoceanography. The continuous rehabilitation of <jats:sup>87</jats:sup>Sr/<jats:sup>86</jats:sup>Sr in fossil fish teeth after deposition would change the original <jats:sup>87</jats:sup>Sr/<jats:sup>86</jats:sup>Sr of seawater recorded near fish teeth but the content of Sr remains unchanged. As for <jats:sup>143</jats:sup>Nd/<jats:sup>144</jats:sup>Nd, when Nd enters the fossils after deposition, the exchange of 143Nd/144Nd between particles and pore liquid gradually ceases due to the saturation of the isomorphism lattice. <jats:sup>143</jats:sup>Nd/<jats:sup>144</jats:sup>Nd of fossil fish teeth may provide more information about deep seawater at the seawater-sediment interface. This study elucidates the enrichment mechanism of REEs in deep-sea sediments and the cautious utilization of <jats:sup>87</jats:sup>Sr/<jats:sup>86</jats:sup>Sr and <jats:sup>143</jats:sup>Nd/<jats:sup>144</jats:sup>Nd of fossils is a prerequisite.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"18 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143790200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Biogeochemical sulfide mineralization in the volcanic-hosted Tongguan hydrothermal field, southern Mid-Atlantic Ridge","authors":"Bing Li, Xuefa Shi, Chuanshun Li, Sai Wang, Jun Ye, Quanshu Yan, Yuan Dang, Xisheng Fang","doi":"10.3389/fmars.2025.1562763","DOIUrl":"https://doi.org/10.3389/fmars.2025.1562763","url":null,"abstract":"Biogeochemical mineralization is increasingly recognized as a significant factor in the formation of submarine hydrothermal sulfide deposits. While several mechanisms by which hydrothermal organisms may facilitate metal deposition have been documented in many seafloor hydrothermal deposits, the potential involvement of biogenic processes in the mineralization of hydrothermal deposits in the southern Mid-Atlantic Ridge (SMAR) has been largely overlooked until now. In this study, we investigate sulfide chimney sample from the volcanic-hosted Tongguan hydrothermal field on the SMAR and present several lines of evidence for biogeochemical mineralization. Mineralogical analysis infers four types of biogenic pyrite and chalcopyrite structures: macrobiotic-related tube structures, microbial-related quasi-stromatolite, quasi-oncolite and globular structures. These biogenic structures exhibit selective enrichment of elements such as Mn, Pb, and Cu in biogenic pyrite compared to abiotic pyrite. <jats:italic>In-situ</jats:italic> sulfur isotope studies indicate that biogenic minerals possess lower δ<jats:sup>34</jats:sup>S values than abiotic minerals. We identified three biomineralization mechanisms: an “active” mineralization process mediated by macro-organism, a “passive” mineralization process associated with microbial mats, and a microbial assimilatory sulfate reduction process. Our research suggests that the role of biogenic processes in SMAR hydrothermal mineralization should be given further consideration.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"25 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143790201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}