Ocean & Coastal Management最新文献

Habitat mosaics of mangroves and reefs support fisheries sustainability for Traditional Owners 红树林和珊瑚礁的栖息地马赛克支持传统所有者的渔业可持续性

IF 5.4 2区环境科学与生态学 Q1 OCEANOGRAPHY

Ocean & Coastal Management

Pub Date : 2026-02-04 DOI: 10.1016/j.ocecoaman.2026.108110

Katherine Cure , Martial Depczynski , Ben Radford , Azton Howard , Phillip McCarthy , Damon Pyke , Sharyn Hickey , Brendan Ford , Diego R. Barneche , Bardi Jawi and Oorany Rangers , Bardi Jawi Traditional Owners

Effective marine conservation planning that supports long-term food security for Indigenous peoples requires a clear understanding of how fish populations use coastal seascapes and interact with local fisheries. Mangroves provide sheltered, accessible fishing grounds that support abundant culturally and commercially important fish. Their ecological connectivity with adjacent reefs, shaped by local tidal regimes, determines how fish use these habitats for food and shelter. We investigated these dynamics in the Bardi Jawi Indigenous Protected Area in the Kimberley region of northwest Australia, an area exposed to extreme tidal ranges (∼12 m). Fish populations were sampled using baited video surveys at mangrove and reef habitats over five years. Satellite-derived habitat models quantified habitat metrics (e.g. area) at local scales. Data were combined to quantify fish population metrics and their relationship to habitat and other environmental variables. Species richness and total fish abundance were higher on reefs, particularly in areas with higher water clarity and greater structural complexity. However, for ten culturally important fisheries species, abundance and biomass were similar in mangrove and reefs and positively associated with the number of available habitat patches regardless of type. Notably, mangroves supported a higher proportion of larger individuals in four of the ten cultural fisheries targets. Bardi Jawi Traditional Ecological Knowledge has long recognised the importance of mangrove-reef connectivity for sustaining fisheries and has informed the design of local spatial protection boundaries that include both habitats. Conservation strategies that integrate knowledge systems to protect mangrove-reef mosaics are essential for sustaining fish populations across coastal seascapes.

支持土著人民长期粮食安全的有效海洋保护规划需要清楚地了解鱼类种群如何利用沿海海景并与当地渔业相互作用。红树林提供了受保护的、可进入的渔场，为丰富的具有重要文化和商业价值的鱼类提供了支持。它们与邻近珊瑚礁的生态连通性，由当地潮汐形成，决定了鱼类如何利用这些栖息地作为食物和庇护所。我们在澳大利亚西北部金伯利地区的Bardi Jawi土著保护区调查了这些动态，该地区暴露于极端潮差（~ 12米）。在五年的时间里，研究人员在红树林和珊瑚礁栖息地进行了鱼饵视频调查，对鱼类种群进行了取样。卫星衍生的生境模式在局部尺度上量化了生境指标（如面积）。将数据结合起来量化鱼类种群指标及其与栖息地和其他环境变量的关系。物种丰富度和鱼类总丰度在珊瑚礁上较高，特别是在水清澈度高、结构复杂的地区。然而，对于10种文化上重要的渔业物种，红树林和珊瑚礁的丰度和生物量相似，并且与可用栖息地斑块的数量呈正相关，无论其类型如何。值得注意的是，在10个文化渔业目标中的4个中，红树林支持较大个体的比例较高。Bardi javi传统生态知识早就认识到红树林-珊瑚礁连通性对维持渔业的重要性，并为包括这两个栖息地的当地空间保护边界的设计提供了信息。整合知识系统以保护红树林-珊瑚礁马赛克的保护战略对于维持沿海海景的鱼类种群至关重要。

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引用次数: 0

Croaker aquaculture to offset declining fisheries in Lagos State, Nigeria 在尼日利亚拉各斯州，鱼养殖抵消了渔业的下降

IF 5.4 2区环境科学与生态学 Q1 OCEANOGRAPHY

Ocean & Coastal Management

Pub Date : 2026-01-31 DOI: 10.1016/j.ocecoaman.2026.108109

Igbodiegwu Gloria Chinwendu , Markus Leibrecht , Okoli Moses Ugochukwu , Benedict Okeke Ebuka , Zhengyong Yang

This study assesses stakeholders' perspectives on barriers and development priorities for croaker (Pseudotolithus spp.) aquaculture in Lagos State, Nigeria, and identifies key attributes of a viable implementation strategy. Primary data were collected between June and August 2024 via surveys and interviews with stakeholders, including fisheries scientists (34 %), policymakers (16 %), fishers (20 %), and fish farmers (30 %). Using Q-methodology, SWOT analysis, and the Quantitative Strategic Planning Matrix (QSPM), we identified distinct stakeholder viewpoints and strategic priorities. Q-methodology revealed two stakeholder perspectives: (i) a Capacity-Building perspective prioritising training programmes, government subsidies, and public–private collaboration, alongside concerns about low consumer purchasing power; and (ii) a Regulatory-Practical perspective emphasising government subsidies, training, and regulatory frameworks, with elevated concern for institutional corruption and biodiversity threats. SWOT analysis revealed strengths in Lagos State's natural conditions and market potential, offset by internal weaknesses owing to infrastructure deficits, financial constraints, and external threats from climate change and economic instability. QSPM prioritised a strategy based on institutional support, regulation, and public awareness over infrastructure-focused approaches. The findings underscore the necessity of policies focused on institutional capacity building, regulatory enforcement, public awareness, and technology adoption to promote sustainable croaker aquaculture in Lagos State, Nigeria.

本研究评估了利益相关者对尼日利亚拉各斯州黄花鱼（Pseudotolithus spp.）水产养殖的障碍和发展重点的看法，并确定了可行实施战略的关键属性。主要数据是在2024年6月至8月期间通过对利益相关者的调查和访谈收集的，包括渔业科学家（34%）、政策制定者（16%）、渔民（20%）和养鱼户（30%）。使用q -方法论、SWOT分析和定量战略规划矩阵（QSPM），我们确定了不同的利益相关者观点和战略优先级。q -方法学揭示了两种利益相关者视角：(i)能力建设视角，优先考虑培训方案、政府补贴和公私合作，同时关注消费者购买力低下；（ii）监管-实践视角，强调政府补贴、培训和监管框架，高度关注机构腐败和生物多样性威胁。SWOT分析揭示了拉各斯州的自然条件和市场潜力的优势，抵消了基础设施不足、财政限制以及气候变化和经济不稳定等外部威胁所造成的内部弱点。QSPM优先考虑基于机构支持、监管和公众意识的战略，而不是以基础设施为重点的方法。调查结果强调，在尼日利亚拉各斯州，有必要制定侧重于机构能力建设、监管执法、公众意识和技术采用的政策，以促进可持续的鱼养殖。

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引用次数: 0

Spatiotemporal dynamics of heavy metal transport and biogeochemical self-purification across the estuary-coast continuum: Insights from field incubation experiments and modeling 重金属运输和生物地球化学自净化的时空动态跨越河口-海岸连续体：来自现场孵化实验和建模的见解

IF 5.4 2区环境科学与生态学 Q1 OCEANOGRAPHY

Ocean & Coastal Management

Pub Date : 2026-01-25 DOI: 10.1016/j.ocecoaman.2026.108108

Demeng Peng , Jibiao Zhang , Peng Zhang

Global industrialization has intensified heavy metal pollution in coastal ecosystems, necessitating a better understanding of their transport and self-purification mechanisms for effective environmental protection. However, the transport of heavy metals across the estuary-coastal continuum remains unclear. This study systematically examined the transport and biogeochemical self-purification of heavy metals in Zhanjiang Bay using seasonal field incubation experiments, numerical model and interpretable machine learning. Results showed scavenging rates of Pb (0.161 d⁻¹) > Cu (0.138 d⁻¹) > Ni (0.136 d⁻¹) > Zn (0.136 d⁻¹) > Cr (0.088 d⁻¹) > Cd (0.081 d⁻¹), with the highest rates in the areas of salinity 5–15 and significant seasonal influence. The bay's complex shoreline caused varying pollutant transport capacities among the inner bay, middle bay, and bay mouth. Hydrodynamic modeling showed water residence times reached up to 65 days in the north of Techeng Island and east of Donghai Dam during the dry season, but were less than 10 days at the bay mouth. However, incorporating the biochemical process accelerated heavy metal self-purification, the water residence time in the north of Techeng Island and the east of Donghai Dam was shortened to within 20 days. After terrestrial heavy metals enter Zhanjiang Bay, from the Suixi River estuary to the bay mouth, the self-purification process alternates between being dominated by physical self-purification and biochemical self-purification. Temperature, suspended particulate matter, and chlorophyll-a were identified as key factors regulating biochemical self-purification, which were strongly modulated by seasonal changes. This study provided important data for coastal management and conservation strategies.

全球工业化加剧了沿海生态系统的重金属污染，需要更好地了解其运输和自净化机制，以有效地保护环境。然而，重金属在河口-海岸连续体上的运输仍不清楚。本研究采用季节性野外孵化实验、数值模型和可解释机器学习等方法，系统研究了湛江湾重金属的迁移和生物地球化学自净化。结果表明：Pb （0.161 d−1）、Cu （0.138 d−1）、Ni （0.136 d−1）、Zn （0.136 d−1）、Cr （0.088 d−1）、Cd （0.081 d−1）的清除率在盐度5 ~ 15的区域最高，且季节影响显著。海湾复杂的海岸线导致了内湾、中湾和湾口之间不同的污染物输送能力。水动力模拟显示，旱季德城岛北部和东海坝以东的水停留时间可达65天，而海湾口的水停留时间不到10天。而加入生化过程加速重金属自净化后，德城岛北部和东海大坝东部水体停留时间缩短至20天以内。陆源重金属进入湛江湾后，从绥溪江河口到海湾河口，自净化过程交替以物理自净化和生化自净化为主。温度、悬浮颗粒物和叶绿素-a是调节生物化学自净化的关键因子，季节变化对其有强烈的调节作用。该研究为海岸管理和保护策略提供了重要数据。

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引用次数: 0

Scaling up surveys: Optimizing sampling scale for monitoring juvenile Asian horseshoe crabs in intertidal habitats 扩大调查规模：优化监测潮间带生境亚洲马蹄蟹幼蟹的抽样规模

IF 5.4 2区环境科学与生态学 Q1 OCEANOGRAPHY

Ocean & Coastal Management

Pub Date : 2026-01-22 DOI: 10.1016/j.ocecoaman.2026.108097

Kit Yue Kwan , Hongtao Dai , Zhenglong Ma , Xin Yang , Yuanjia Wu , Xiang Zhou , Xingquan Wei , Cong Luo , Guanggu Lei , Zexin Li , Ruifang Chen , Lanfang Dong , Haijuan Liu , Zhaohong Weng , Kai Liu , Chun-Chieh Wang

Detecting shifts in population baselines is essential for assessing ecological responses to anthropogenic and climate-related stressors. Long-term monitoring of juvenile Asian horseshoe crabs is necessary in regions where adult populations have declined to the extent that direct surveys are no longer viable. However, inconsistencies in sampling design, effort and geographic coverage hinder cross-regional comparisons and reduce the reliability of findings for informing conservation and management strategies. In this study, populations of juvenile Tachypleus tridentatus and Carcinoscorpius rotundicauda were surveyed at five nursery shores along the northern Beibu Gulf, China, to assess the effects of three components of sampling scale—quadrat size, sampling extent and sampling interval—on population estimates. The results showed that smaller quadrats yielded significantly higher density estimates for both species, whereas occupancy and Lloyd's patchiness indices remained relatively unaffected by quadrat size. Juvenile abundance and density increased with sampling extent, particularly within the first horizontal transects where aggregations occurred near the fringes of mangrove forests. Density estimates and their coefficients of variation (CVs) were more sensitive than abundance, with distinct peaks and troughs in density and CV values respectively, aligning with observed aggregations. While density estimates were generally stable across different sampling intervals, larger quadrat sizes were more effective in detecting fine-scale spatial heterogeneity. We recommend the use of density interpolation maps to more accurately depict the pattern of patchy distribution patterns with minimal influence from sampling scale. These findings underscore the value of moderately larger quadrats in providing relatively reliable and comparable assessments of juvenile horseshoe crab populations and other patchily distributed intertidal species.

检测人口基线的变化对于评估对人为和气候相关压力源的生态反应至关重要。在成年马蹄蟹数量减少到无法进行直接调查的程度的地区，有必要对幼年马蹄蟹进行长期监测。然而，抽样设计、努力和地理覆盖范围的不一致性阻碍了跨区域比较，降低了为保护和管理战略提供信息的调查结果的可靠性。本研究在北部湾北部的5个苗圃海岸对三叉戟速鳗（Tachypleus tridentatus）和圆尾癌蛾（Carcinoscorpius rotundicauda）幼鱼种群进行了调查，探讨了采样尺度、样方大小、采样范围和采样间隔3个组成部分对种群估计的影响。结果表明，样方面积越小，两种物种的密度估计值越高，而占用率和劳埃德斑块指数相对不受样方面积大小的影响。幼鱼的丰度和密度随采样范围的增加而增加，特别是在靠近红树林边缘聚集的第一个水平样带内。密度估计及其变异系数（CV）比丰度更敏感，密度和CV值分别有明显的波峰和波谷，与观测到的聚集一致。虽然密度估计值在不同的采样间隔内通常是稳定的，但更大的样方尺寸在检测精细尺度的空间异质性方面更有效。我们建议使用密度插值图，以更准确地描绘斑块分布模式的模式，而采样规模的影响最小。这些发现强调了适度大的样方在提供相对可靠和可比较的幼年马蹄蟹种群和其他斑驳分布的潮间带物种评估方面的价值。

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引用次数: 0

Ecosystem trophic status during Nemopilema nomurai bloom and non-bloom periods in a temperate Marginal Sea: Insights from ecological network analysis 温带边缘海野线虫华、非华期生态系统营养状况：来自生态网络分析的见解

IF 5.4 2区环境科学与生态学 Q1 OCEANOGRAPHY

Ocean & Coastal Management

Pub Date : 2026-01-21 DOI: 10.1016/j.ocecoaman.2026.108105

Dongjie Guo , Fang Zhang , Wenxiao Zang , Xu Wang , Ling Zhu , Song Sun

Nemopilema nomurai Kishinouye, 1922, has emerged as a dominant large jellyfish species in the East Asian Marginal Seas over recent decades, posing increasing ecological and management challenges. To elucidate its ecological role, two Ecopath models representing N. nomurai bloom (2012–2013) and non-bloom (2014) periods in the northern East China Sea and southern Yellow Sea were developed. Ecological network analysis was employed to assess variations in ecosystem trophic status between these two periods. Results from keystone index and mixed trophic impact analysis revealed that N. nomurai occupied a more pivotal ecological role during bloom period, exerting widespread negative effects on multiple functional groups and thereby disrupting energy transfer within the food web. During bloom period, there were notable increases in total system throughput, total biomass, total primary production, and ascendency, indicating an expansion in ecosystem scale. Conversely, declines in Finn's cycling index and average path length suggested weakened recycling processes and shortened trophic linkages. Furthermore, decreased average mutual information, along with modified constraint efficiency, reflected a less organized and more structurally constrained energy pathway. Generally, these shifts depicted an ecosystem status characterized by high scale but reduced efficiency, disrupted trophic organization, and diminished ecosystem maturity during N. nomurai bloom period. These findings enhance our understanding of the ecological impacts of N. nomurai within marine food webs and emphasize the importance of integrating jellyfish dynamics into ecosystem-based management strategies and ecosystem health assessments.

Nemopilema nomurai Kishinouye, 1922，近几十年来已成为东亚边缘海的优势大型水母物种，对生态和管理提出了越来越大的挑战。为了阐明其生态作用，本文在东海北部和黄海南部建立了代表野藻华（2012-2013）期和非华（2014）期的Ecopath模型。采用生态网络分析方法评价两个时期生态系统营养状况的变化。keystone指数和混合营养影响分析结果表明，野乳草在开花期的生态作用更为关键，对多个官能团产生广泛的负面影响，从而破坏了食物网内的能量传递。在水华期，系统总吞吐量、总生物量、总初级生产量和优势度显著增加，表明生态系统规模扩大。相反，芬兰的循环指数和平均路径长度的下降表明循环过程减弱，营养联系缩短。此外，平均互信息的减少和约束效率的提高，反映了一个更少的组织和更多的结构约束的能量路径。总体而言，这些变化表现为高规模但效率低下，营养组织被破坏，生态系统成熟度降低的生态系统状态。这些研究结果增强了我们对野水母在海洋食物网中的生态影响的理解，并强调了将水母动力学纳入基于生态系统的管理策略和生态系统健康评估的重要性。

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引用次数: 0

The role of the marine new infrastructure in the low-carbon development of marine fisheries--micro-level evidence from China 海洋新基础设施在海洋渔业低碳发展中的作用——来自中国的微观证据

IF 5.4 2区环境科学与生态学 Q1 OCEANOGRAPHY

Ocean & Coastal Management

Pub Date : 2026-01-21 DOI: 10.1016/j.ocecoaman.2026.108106

Li Zhang , Hui Zheng , Ning Yu , Hairong Mu

Marine new infrastructure (MNI) is playing an increasingly important role in supporting marine fisheries, yet its impact on carbon mitigation remains insufficiently understood. The objective of this study was to develop and empirically test a conceptual framework linking MNI to low-carbon development in marine fisheries. We proposed a tripartite framework for MNI, comprising integration infrastructure, innovation infrastructure, and information infrastructure. Based on the measurement of marine fishery carbon emission efficiency (MFCEE) using a Super-EBM model across China's 11 coastal provinces from 2006 to 2021, the impact of MNI was evaluated. Results yielded three main findings: First, MNI significantly improved carbon efficiency, with integration infrastructure exhibiting the strongest effect, followed by innovation and information infrastructures; Second, the improvement in MFCEE was driven primarily by industrial structure optimization, aquaculture technology promotion, and production scale expansion; and Third, the effects of MNI were moderated by environmental regulation, for which command-and-control regulation showed a single-threshold effect, while market-based regulation presented a double-threshold effect. These regulatory thresholds helped explain regional disparities, with significant efficiency gains observed in the Northern and Southern Marine Economic Circles but efficiency losses in the Eastern Circle. Overall, this study provided a theoretical foundation for understanding MNI's role in low-carbon fisheries development and offered practical insights for spatial planning and regulatory design.

海洋新基础设施（MNI）在支持海洋渔业方面发挥着越来越重要的作用，但其对碳减排的影响仍未得到充分认识。本研究的目的是开发并实证检验一个将海洋渔业低碳发展与MNI联系起来的概念框架。我们提出了一个由集成基础设施、创新基础设施和信息基础设施组成的三方框架。利用Super-EBM模型对2006 - 2021年中国11个沿海省份的海洋渔业碳排放效率（MFCEE）进行测量，评价了MNI的影响。结果表明：第一，MNI显著提高了碳效率，其中整合基础设施的影响最大，其次是创新和信息基础设施；二是产业结构优化、养殖技术推广、生产规模扩大等主要驱动因素；环境规制对MNI的影响有调节作用，其中命令控制型规制表现为单门槛效应，市场化规制表现为双门槛效应。这些监管门槛有助于解释区域差异，北部和南部海洋经济圈的效率显著提高，但东部海洋经济圈的效率下降。总体而言，本研究为理解MNI在低碳渔业发展中的作用提供了理论基础，并为空间规划和监管设计提供了实践见解。

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引用次数: 0

Spatiotemporal heterogeneity of human footprint across China's coastal zone: Integrating geomorphic and policy drivers 中国沿海地区人类足迹的时空异质性：整合地貌和政策驱动因素

IF 5.4 2区环境科学与生态学 Q1 OCEANOGRAPHY

Ocean & Coastal Management

Pub Date : 2026-01-20 DOI: 10.1016/j.ocecoaman.2026.108094

Dan Meng , Xiaomei Yang , Yueming Liu , Zhihua Wang , Guo Yu , Ku Gao

Human activities and resource exploitation are increasingly concentrated in coastal zones, highlighting the need for objective quantification of human activity intensity and long-term trends to inform sustainable management. This study develops a thirty-year (1990–2020) human footprint map for China's coastal zone at a 1km² resolution, integrating multi-source anthropogenic pressure data with coastal-specific indicators. The analysis reveals distinct spatial patterns across coastal geomorphological units and functional zoning categories. Results show that coastal-adapted indicators effectively capture spatiotemporal heterogeneity in human pressure. Overall, human activity intensity has increased along China's coastline, with higher pressure observed on muddy coasts north of Shanghai compared to the bedrock coasts of the south. Biological and sandy coasts exhibit slower intensification rates. Among functional zones, urban coastal areas display the highest cumulative growth in human footprint, while ecological conservation zones demonstrate effectiveness in limiting anthropogenic impact. This study provides a spatially explicit foundation for integrated land-sea management and supports the design of development and conservation strategies tailored to China's dynamic coastal systems.

人类活动和资源开发日益集中在沿海地区，突出表明需要客观量化人类活动强度和长期趋势，以便为可持续管理提供信息。本研究将多源人为压力数据与沿海特定指标相结合，以1km2分辨率绘制了中国海岸带30年（1990-2020年）人类足迹地图。分析揭示了不同的沿海地貌单元和功能区划类型的空间格局。结果表明，沿海适应指标有效地反映了人类压力的时空异质性。总体而言，中国沿海地区的人类活动强度有所增加，与南部基岩海岸相比，上海北部泥泞海岸的压力更高。生物海岸和沙质海岸的强化速度较慢。在功能区中，城市沿海地区的人类足迹累积增长最高，而生态保护区在限制人为影响方面表现出有效性。该研究为陆地-海洋综合管理提供了明确的空间基础，并支持设计适合中国动态沿海系统的开发和保护策略。

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引用次数: 0

Digital technologies and the study of adaptation in small-scale fisheries 数字技术和小型渔业适应研究

IF 5.4 2区环境科学与生态学 Q1 OCEANOGRAPHY

Ocean & Coastal Management

Pub Date : 2026-01-20 DOI: 10.1016/j.ocecoaman.2025.108071

Juan Carlos Villaseñor-Derbez , Rebeca Fernández , Stuart Fulton , Arturo Hernández-Velasco , Tamara Hernández , C. Brock Woodson , Juan Camilo Cárdenas , Giulio A. DeLeo , Jorge Torre , Fiorenza Micheli

Economic experiments have led to important advances in our understanding of human adaptation in coupled social-environmental systems. However, these experiments may be costly, which limits their scale and even the external validity of their results. Digital technologies offer great potential to deploy economic experiments at scale, but this approach remains largely untested. Here, we evaluate the feasibility of using mobile computing platforms (smartphones, tablets, and computers) to deploy digital economic experiments that collect players’ response to environmental shocks. To do so, we developed a digital version of a well-studied natural resource harvesting game characterized by a renewable common-pool resource harvested in repeated iterations. We recorded a total of 3369 interactions with the outreach material, which led to a total of 740 rounds played; Only 11 players participated in the baseline and treatment games. We show that players’ behavior during digital experiments was qualitatively similar to responses observed during in-person games with fishers reported in the literature. Additionally, our exploratory analysis suggests that information about the risk of a shock is not enough to induce adaptation by players and that experiencing the shock is needed. Digital experiments provide an alternative path to study adaptation, but the approach presents its own limitations. Addressing the current limitations, particularly through strategies for engaging players, presents an opportunity for broad application of this approach to understand and inform adaptation to change.

经济实验使我们对人类适应耦合社会环境系统的理解取得了重要进展。然而，这些实验可能是昂贵的，这限制了他们的规模，甚至他们的结果的外部有效性。数字技术为大规模部署经济实验提供了巨大的潜力，但这种方法在很大程度上仍未经检验。在这里，我们评估了使用移动计算平台（智能手机、平板电脑和电脑）部署数字经济实验的可行性，这些实验收集玩家对环境冲击的反应。为此，我们开发了一款经过充分研究的自然资源收集游戏的数字版本，其特点是在重复迭代中收集可再生的公共资源。我们总共记录了3369次与外联材料的互动，总共进行了740轮；只有11名球员参加了基线和治疗游戏。我们发现，玩家在数字实验中的行为在性质上与文献中报道的与渔民面对面游戏中观察到的反应相似。此外，我们的探索性分析表明，关于冲击风险的信息不足以诱导玩家适应，体验冲击是必要的。数字实验为研究适应性提供了另一种途径，但这种方法也有其局限性。解决当前的限制，特别是通过吸引玩家的策略，为广泛应用这一方法提供了机会，以理解和告知适应变化。

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引用次数: 0

Occurrence, morphology and ecological risk of microplastics in water and sediments along the Huangpu River 黄浦江沿岸水体和沉积物中微塑料的存在、形态及生态风险

IF 5.4 2区环境科学与生态学 Q1 OCEANOGRAPHY

Ocean & Coastal Management

Pub Date : 2026-01-17 DOI: 10.1016/j.ocecoaman.2026.108098

Zhiyin Zhang , Siyuan Ling , Xiaoyong Qian , Cheng Peng , Wei Zhang

This study systematically examined microplastics (MPs) pollution in water and sediment samples from 17 sites along the Huangpu River during the wet season in August 2022. MPs were analyzed for abundance, morphology, color, polymer type, and particle size using digestion, flotation, microscopy, and Fourier transform infrared spectroscopy. Ecological risk was assessed via the risk characterization ratio (RCR) based on polymer hazard factors. The results showed that average MPs abundances were 239.01 ± 168.31 particles/L in surface water and 2063.9 ± 1362.59 particles/kg in sediments, with 100 % detection rates. Surface water MPs were mainly fragment-shaped (99.7 %), transparent (99.85 %), and <0.5 mm (97.46 %), dominated by low-density polyethylene (51.80 %). Sediment MPs were mostly fragment-shaped (63.68 %), transparent (73.54 %), and <1 mm (82.06 %), primarily polyethylene (50.22 %). Ecological risk assessment revealed RCR values were below 1 in surface water, indicating no significant risk. One sediment site exceeded a RCR of 10, indicating medium risk due to accumulation of high-risk polymers (polyamide and polymethyl methacrylate) from industrial areas. Compared to other river basins domestically and internationally, MPs pollution in the Huangpu River is moderate, with spatial heterogeneity influenced by human activities (domestic sewage, industrial distribution) and hydraulic migration. This study provides essential data for the prevention and control of MPs pollution in urban river environment.

本研究系统地检测了2022年8月黄浦江沿岸17个地点的水和沉积物样本中的微塑料污染。通过溶出、浮选、显微镜和傅里叶变换红外光谱分析MPs的丰度、形态、颜色、聚合物类型和粒度。采用基于聚合物危害因子的风险表征比（RCR）对生态风险进行评价。结果表明，地表水和沉积物中MPs的平均丰度分别为239.01±168.31颗粒/L和2063.9±1362.59颗粒/kg，检出率均为100%。地表水MPs主要为块状（99.7%）、透明（99.85%）和<；0.5 mm(97.46%)，以低密度聚乙烯（51.80%）为主。沉积物MPs主要为块状（63.68%）、透明（73.54%）和1 mm(82.06%)，主要为聚乙烯（50.22%）。生态风险评价显示，地表水RCR值小于1，无显著风险。一个沉积物地点的RCR超过了10，表明由于来自工业区的高风险聚合物（聚酰胺和聚甲基丙烯酸甲酯）的积累，存在中等风险。与国内外其他流域相比，黄浦江MPs污染较为中度，受人类活动（生活污水、工业分布）和水力迁移的影响存在空间异质性。本研究为城市河流环境中MPs污染的防治提供了必要的数据。

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引用次数: 0

Shallow gas accumulation shaped by morphological evolution in the Changjiang subaqueous delta: Implications for seabed instability and geohazard management 长江水下三角洲形态演化形成的浅层天然气成藏：对海底不稳定和地质灾害管理的启示

IF 5.4 2区环境科学与生态学 Q1 OCEANOGRAPHY

Ocean & Coastal Management

Pub Date : 2026-01-14 DOI: 10.1016/j.ocecoaman.2026.108096

Shihao Liu , Yufeng Chen , Wei Feng

River deltas are crucial repositories of organic carbon, particularly in their coastal regions from the river mouth to the delta front. Although these regions are influenced by a range of physical and biogeochemical processes, the impact of such processes on shallow gas, a vital form of organic carbon storage, remains poorly understood. Here, we integrate ∼2700 km of high-resolution seismic profiles with sedimentological and geomorphological datasets to investigate how the morphological evolution of the Changjiang (Yangtze River) Estuary, especially the progradation of mouth-bar shoals and their recent retreat, has shaped the accumulation, migration, and release potential of shallow gas. Our results delineate three distinct zones from the subaqueous river mouth to the delta front, each displaying contrasting gas accumulation patterns governed by morphodynamic processes. In the northern subaqueous delta, rapid sediment accretion and high organic-carbon burial enhance methane generation, causing pronounced gas-front surges over 5 m in height, accompanied by irregular or jagged front morphologies and dense gas chimneys. We attribute these features to combined deep-sourced methane migration and in-situ methanogenesis, modulated by variations in sediment thickness and sealing bed properties associated with shoal progradation and retreat. In contrast, the southern sector exhibits thinner cap beds and stronger hydrodynamic forcing, which promote gas release and near-equilibrium gas fronts. We document large gas-related pockmarks (up to 150–200 m wide) and active venting features, suggesting that methane migration contributes to localized seabed instability. These venting structures are located near major engineering corridors and ecologically sensitive areas, highlighting their relevance for infrastructure safety and environmental management. These findings have broader implications for understanding methane behavior in deltaic systems and emphasize the importance of incorporating shallow gas mapping into coastal geohazard assessments, marine spatial planning, and coastal infrastructure design in gas-bearing deltaic environment.

河流三角洲是有机碳的重要储存库，特别是在河口到三角洲前缘的沿海地区。尽管这些地区受到一系列物理和生物地球化学过程的影响，但这些过程对浅层气体（有机碳储存的重要形式）的影响仍然知之甚少。在这里，我们将约2700公里的高分辨率地震剖面与沉积学和地貌学数据集相结合，研究长江口（长江）口的形态演化，特别是河口滩的进淤及其近期的退缩，如何塑造了浅层天然气的聚集、运移和释放潜力。我们的研究结果描绘了从水下河口到三角洲前缘三个不同的区域，每个区域都显示出由形态动力学过程控制的不同的天然气聚集模式。在北部水下三角洲，快速的沉积物增生和较高的有机碳埋藏促进了甲烷的生成，导致5 m以上高度的气锋涌动明显，并伴有不规则或锯齿状的前缘形态和密集的气烟囱。我们将这些特征归因于深层甲烷迁移和原位甲烷生成的结合，并受到与浅滩进退相关的沉积物厚度变化和密封层性质的调节。南段盖层较薄，水动力强迫较强，有利于气体释放和接近平衡的气锋。我们记录了与气体有关的大麻子（高达150-200米宽）和活跃的喷口特征，表明甲烷迁移有助于局部海底不稳定。这些通风结构位于主要工程走廊和生态敏感区附近，突出了它们与基础设施安全和环境管理的相关性。这些发现对理解三角洲系统中的甲烷行为具有更广泛的意义，并强调了在含气三角洲环境中将浅层天然气测绘纳入沿海地质灾害评估、海洋空间规划和沿海基础设施设计的重要性。

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