Regional Studies in Marine Science最新文献_第4页

Hydrodynamic control over shallow ferromanganese crust deposits in the West Rio Grande Rise 西里约热内卢大隆起浅层锰铁壳矿床的水动力控制

IF 2.4 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2026-03-01 Epub Date: 2026-02-11 DOI: 10.1016/j.rsma.2026.104833

Pedro W.M. Souza-Neto , Muhammad Bin Hassan , João P.M. Amorim , Milton Borges-Silva , Cesar B. Rocha , Ilson C.A. da Silveira

The West Rio Grande Rise (WRGR), an oceanic elevation in the Southwestern Atlantic, hosts extensive ferromanganese crust deposits that are rich in critical metals and rare earth elements. These crusts are formed under specific environmental conditions, influenced by factors such as nutrients, oxygen levels, biological and hydrodynamic processes. This study investigates the influence of intense hydrodynamic processes occurring between 500–1500 m on the exposure of ferromanganese crusts in the shallower portion of the WRGR. The hydrodynamics in this region is characterized by an intense anticyclonic mean current spanning between 500–1500 m, that is generated by nonlinear interactions between strong tidal currents and the southern branch of the South Equatorial Current with the topography. By integrating results from two complementary approaches, a statistical classification model and a coupled hydrodynamic–sediment transport model, we test the hypothesis that near-seabed currents play a key role in controlling crust exposure and preservation in the shallower region of the WRGR (500–1500 m). Statistical analysis identifies key environmental factors — such as conservative temperature, absolute salinity, mean flow speed, and tidal amplitude — distinguishing ferromanganese crust from carbonate deposits. Hydrodynamic modeling reveals that strong near-seabed currents inhibit sediment deposition over crust areas, maintaining their exposure. Up to 80% of ferromanganese crust areas can be explained by these hydrodynamic patterns. These findings underscore the role of hydrodynamics in maintaining ferromanganese crust exposure and offer important insight into the modern oceanic processes that govern where crusts remain exposed.

西里约热内卢大隆起（WRGR）是西南大西洋的一个海洋高地，拥有大量富含关键金属和稀土元素的锰铁地壳矿床。这些结壳是在特定的环境条件下形成的，受营养物质、氧气水平、生物和水动力过程等因素的影响。本研究探讨了发生在500-1500 m之间的强烈水动力过程对WRGR浅部锰铁结壳暴露的影响。该地区的水动力特征是在500-1500 m之间存在强烈的反气旋平均流，这是由强潮流和南赤道流南支与地形的非线性相互作用产生的。通过整合统计分类模型和水动力-泥沙耦合输运模型两种互补方法的结果，我们验证了近海底流在WRGR较浅区域（500-1500 m）控制地壳暴露和保存中起关键作用的假设。统计分析确定了关键的环境因素——如保守温度、绝对盐度、平均流速和潮汐振幅——将锰铁地壳与碳酸盐矿床区分开来。水动力模拟显示，强烈的近海床洋流抑制了地壳区域的沉积物沉积，保持了它们的暴露。高达80%的锰铁地壳区域可以用这些水动力模式来解释。这些发现强调了流体动力学在维持锰铁地壳暴露中的作用，并为控制地壳暴露位置的现代海洋过程提供了重要的见解。

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引用次数: 0

Projecting climate change impacts on thermal performance and fitness of Octopus maya in the Campeche Bank 气候变化对坎佩切河岸玛雅章鱼热性能和适合度的影响

IF 2.4 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2026-03-01 Epub Date: 2026-01-27 DOI: 10.1016/j.rsma.2026.104809

Ángel Escamilla-Aké , Luis Enrique Angeles-Gonzalez , Ángel Rojo-Cebreros , Alejandro Kurczyn , Carlos Rosas

Climate change poses a significant threat to marine ecosystems with rising sea temperatures, particularly affecting the thermal performance and fitness of marine ectotherms, such as Octopus maya. The present study developed a prospective model to assess the impact of temperature changes on O. maya populations in the Campeche Bank, a key fishing region in the Gulf of Mexico. The model integrates physiological data with thermal gradients estimates across three distinct zones: upwelling (Zone I), transitional (Zone II), and non-upwelling (Zone III), and incorporates the instantaneous effects of temperature on performance and tolerance time. The results indicate that O. maya exhibits optimal fitness within a temperature range of 21°C to 26°C, with a significant decrease in fitness as temperatures exceed 26°C, particularly in warmer Zone III. Continuous bottom temperature monitoring is essential, especially in shallow coastal waters where O. maya is harvested by artisanal fishers to assess long-term viability. The findings highlight the importance of integrating environmental monitoring with adaptive management strategies to mitigate climate change impacts on this valuable species and the coastal communities that depend on it.

随着海水温度的上升，气候变化对海洋生态系统构成了重大威胁，特别是影响了玛雅章鱼等海洋变温动物的热性能和适应性。本研究开发了一个前瞻性模型，以评估温度变化对墨西哥湾坎佩切河岸的玛雅人种群的影响，坎佩切河岸是墨西哥湾的一个重要渔区。该模型将生理数据与三个不同区域的热梯度估计相结合：上升流（区I）、过渡（区II）和非上升流（区III），并结合了温度对性能和耐受时间的瞬时影响。结果表明，玛雅古树在21 ~ 26°C的温度范围内适合度最佳，超过26°C后适合度显著降低，特别是在较温暖的III区。持续的海底温度监测是必不可少的，特别是在沿海浅水地区，手工渔民捕捞玛雅鱼以评估其长期生存能力。研究结果强调了将环境监测与适应性管理策略相结合的重要性，以减轻气候变化对这种珍贵物种和依赖它的沿海社区的影响。

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引用次数: 0

Integration of Azolla filiculoides in wastewater-fed aquaculture: Enhancing water quality, mitigating heavy metals, and promoting Tilapia production 废水养殖中绿藻的整合：改善水质，减少重金属，促进罗非鱼生产

IF 2.4 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2026-03-01 Epub Date: 2026-02-10 DOI: 10.1016/j.rsma.2026.104851

Tarek Saif , Manel Ben Ali , Abeer S.Y. Mohamed , Itrat Zahra , Hatim M. Al-Yasi , Fehmi Boufahja , Ezzeddine Mahmoudi , Hamouda Beyrem , Kamal Shaltout , Ali El-Keblawy , T.M. Galal , Abdel-Moneim M. Yones , Salma K. Shaltout , Amor Hedfi

Freshwater scarcity is intensifying worldwide. Tertiary-treated municipal wastewater offers a low-cost nutrient source for aquaculture yet carries risks of heavy-metal accumulation. We integrated the floating fern Azolla filiculoides with Nile Tilapia to polish five wastewater ratios (0, 25, 50, 75, and 100 %) and supply supplementary feed. Over 90 days, Azolla reduced NH₄-N by 50–70 %, NO₃-N by 60 % and phosphate by 55 %, while raising dissolved oxygen. Azolla biomass accumulated Cd, Pb, Zn, Cu, Mn and Fe up to 96 % more than the control, keeping fish muscle below FAO/WHO thresholds. Growth of Tilapia (2.3 g to 52–61 g) was maintained or improved at 25–50 % effluent with Azolla, whereas 100 % effluent without Azolla depressed yield by 36 %. Fillet protein (15.4 %) and lipid (6.3–6.8 %) were unaffected. Azolla therefore offers a dual-purpose, nature-based solution for safe wastewater reuse in arid-zone aquaculture, aligning with SDG 6 (clean water) and SDG 2 (food security).

全世界的淡水短缺正在加剧。三级处理的城市污水为水产养殖提供了低成本的营养源，但存在重金属积累的风险。我们将漂浮蕨类植物Azolla filiculoides与尼罗罗非鱼（Nile罗非鱼）结合，以优化5种废水比例（0、25、50、75和100 %），并提供补充饲料。在90天的时间里，Azolla将nh4 -N降低了50-70 %，将NO₃-N降低了60 %，将磷酸盐降低了55 %，同时提高了溶解氧。与对照相比，红豆生物量累积Cd、Pb、Zn、Cu、Mn和Fe高达96% %，使鱼类肌肉保持在FAO/WHO阈值以下。罗非鱼的生长（2.3 g至52-61 g）在25 - 50% %的废水中得到维持或促进，而100 %的废水中没有添加Azolla，产量下降了36 %。鱼片蛋白（15.4 %）和脂质（6.3-6.8 %）未受影响。因此，Azolla为干旱地区水产养殖中的安全废水回用提供了一种双重用途、基于自然的解决方案，符合可持续发展目标6（清洁水）和可持续发展目标2（粮食安全）。

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引用次数: 0

DBP metabarcoding pipeline: An integrated tool for eDNA analysis of ONT data using the Indonesian marine fish database DBP元条形码管道：使用印度尼西亚海鱼数据库对ONT数据进行eDNA分析的综合工具

IF 2.4 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2026-03-01 Epub Date: 2026-02-20 DOI: 10.1016/j.rsma.2026.104868

Muhammad Danie Al Malik , Melvie Aulya , Ni Kadek Dita Cahyani

Environmental DNA (eDNA) metabarcoding with ONT Nanopore has been increasingly applied in Indonesia, a global megabiodiversity hotspot, as a complement to traditional biodiversity surveys such as visual census. However, the development of user-friendly bioinformatics pipelines remains an ongoing challenge, particularly for processing and interpreting ONT-based eDNA metabarcoding data. Here, we present the Diponegoro Biodiversity Project (DBP) Metabarcoding Pipeline, designed to streamline the processing of ONT sequence outputs for metabarcoding applications. The pipeline integrates sequential steps of quality filtering with NanoFilt, primer trimming with Cutadapt, OTU clustering and chimera removal with VSEARCH, and taxonomic assignment using BLASTn followed by a Lowest Common Ancestor (LCA) approach. To facilitate application in the context of the Indonesian region, we developed a region-specific reference database (“LocalDB”) comprising 1885 marine fish species, and a combined database (“LocalDB + Pre-made”) covering 2163 marine fish species from the 12S MiFish region, representing Actinopteri and Chondrichthyes. We applied the pipeline with three reference sets (LocalDB, Pre-made, and LocalDB + Pre-made) to eDNA datasets from five marine water samples to evaluate taxonomic resolution and alpha diversity difference. Results showed no significant differences in taxonomic resolution at the genus and species levels, nor in biodiversity metrics across the three databases, indicating that the use of a local database did not alter ecological inferences compared with non–region-specific databases. However, the local database offers the advantage of being curated with native species, reducing misidentifications and false positives. Overall, the DBP pipeline and curated databases provide an integrated protocol for rapid assessment and marine biodiversity monitoring in Indonesia. The resources are available at https://github.com/mdaniealmalik/DBP_Metabarcoding_Pipeline.git

基于ONT纳米孔的环境DNA元条形码技术作为视觉普查等传统生物多样性调查的补充，在全球超级生物多样性热点国家印度尼西亚得到了越来越多的应用。然而，开发用户友好的生物信息学管道仍然是一个持续的挑战，特别是处理和解释基于ont的eDNA元条形码数据。在这里，我们提出了Diponegoro生物多样性项目（DBP）元条形码管道，旨在简化ONT序列输出的处理，用于元条形码应用。该管道集成了NanoFilt的质量过滤，Cutadapt的引物修剪，VSEARCH的OTU聚类和嵌合体去除，以及使用BLASTn和最低共同祖先（LCA）方法进行分类分配的顺序步骤。为了便于在印度尼西亚地区的应用，我们开发了一个包含1885种海洋鱼类的区域特定参考数据库（“LocalDB”），以及一个包含12S MiFish地区2163种海洋鱼类的组合数据库（“LocalDB + Pre-made”），包括放线鱼目和软骨鱼目。我们将三个参考集（LocalDB、Pre-made和LocalDB + Pre-made）的管道应用于来自5个海水样品的eDNA数据集，以评估分类分辨率和α多样性差异。结果显示，3个数据库在属和种水平的分类学分辨率以及生物多样性指标上没有显著差异，表明与非区域特异性数据库相比，使用本地数据库不会改变生态推断。然而，本地数据库提供了与本地物种一起管理的优势，减少了错误识别和误报。总体而言，DBP管道和管理数据库为印度尼西亚的快速评估和海洋生物多样性监测提供了一个综合方案。资源可在https://github.com/mdaniealmalik/DBP_Metabarcoding_Pipeline.git上获得

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引用次数: 0

Geospatial analysis of Cyclone Remal's impact on the Sundarbans Biosphere Reserve: Insights into vegetation loss, shoreline changes, and flooding dynamics 气旋残余对孙德尔本斯生物圈保护区影响的地理空间分析：对植被损失、海岸线变化和洪水动态的见解

IF 2.4 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2026-03-01 Epub Date: 2026-01-28 DOI: 10.1016/j.rsma.2026.104816

Manoranjan Mishra , Debdeep Bhattacharyya , Tamoghna Acharyya , Rajkumar Guria , Suman Paul , Chandra Shekhar Dwivedi , Palash Naiya , Richarde Marques da Silva , Celso Augusto Guimarães Santos

The Sundarbans, the world’s largest mangrove forest located at the confluence of the Ganges, Brahmaputra, and Meghna rivers, is highly vulnerable to tropical cyclones originating in the Bay of Bengal. This study evaluates the immediate ecological and geomorphological impacts of Cyclone Remal (24–27 May 2024) on the Sundarban Biosphere Reserve (SBR), with a focus on vegetation degradation, shoreline dynamics, and flood inundation. A multi-index geospatial approach was employed using NDVI, EVI, the Modified Vegetation Condition Index (mVCI), and the Disaster Vegetation Damage Index (DVDI) to assess vegetation health. Shoreline changes were analyzed using the Digital Shoreline Analysis System (DSAS) and Net Shoreline Movement (NSM), while Sentinel-1 SAR data were used for flood mapping. The results indicate a 38.05% decline in dense vegetation and a 76.25% increase in sparse vegetation, with mVCI and DVDI revealing that 18.01% of the region experienced severe damage. Shoreline erosion was more pronounced in the Indian Sundarbans (mean retreat of 43.16 m) compared to Bangladesh (28.78 m). Approximately 97% of the flood-affected area was in non-mangrove zones, underscoring the protective role of mangroves. The study highlights the effectiveness of multi-index geospatial analysis for rapid post-disaster assessment and underscores the urgent need for adaptive conservation and disaster resilience strategies in climate-sensitive coastal ecosystems like the Sundarbans.

孙德尔本斯是世界上最大的红树林，位于恒河、布拉马普特拉河和梅克纳河的交汇处，极易受到源自孟加拉湾的热带气旋的影响。本研究评估了气旋残余（2024年5月24-27日）对孙德班生物圈保护区（SBR）的直接生态和地貌影响，重点关注植被退化、海岸线动态和洪水淹没。采用NDVI、EVI、改良植被状况指数（mVCI）和灾害植被损害指数（DVDI）等多指标地理空间方法评价植被健康状况。利用数字海岸线分析系统（DSAS）和净海岸线运动（NSM）分析海岸线变化，利用Sentinel-1 SAR数据进行洪水制图。结果表明，密植植被减少38.05%，稀疏植被增加76.25%，mVCI和DVDI显示18.01%的区域遭受严重破坏。与孟加拉国的海岸线侵蚀（28.78 m）相比，印度孙德尔本斯的海岸线侵蚀更为明显（平均后退43.16 m）。约97%的受洪水影响地区位于非红树林地区，突显了红树林的保护作用。该研究强调了多指数地理空间分析在灾后快速评估中的有效性，并强调了孙德尔本斯等气候敏感型沿海生态系统迫切需要适应性保护和灾害恢复战略。

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引用次数: 0

Fish egg assemblages reflect high species richness and spatial heterogeneity of fish spawning in nearshore waters around a tropical island in the northern South China Sea 南海北部热带岛屿近岸水域鱼卵组合反映了鱼类产卵的丰富度和空间异质性

IF 2.4 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2026-03-01 Epub Date: 2026-02-21 DOI: 10.1016/j.rsma.2026.104870

Lu Zhang , Ying Lu , Yanghao Liu , Zhongbo Miao , Wentong Xia , Songguang Xie

Tropical nearshore waters typically harbor diverse and complex ecosystems, supporting abundant fishery resources. Their intricate topographical and hydrological features provide optimal spawning habitats for fish. Investigations into species compositions and distribution of fish eggs yield critical insights into spawning grounds, offering substantial value for conservation efforts. Hainan Island is situated in the northern tropical zone of the South China Sea. In this study, fish eggs were collected from 50 sampling stations in the nearshore waters surrounding Hainan Island in April 2024, the peak spawning season. A total of 84,030 eggs were collected, encompassing 212 taxonomic units across multiple ecological guilds: coral reef-associated (CR) species, other nearshore (CF) species, pelagic-oceanic (PL) species, and deep-sea (DS) species. Three primary spawning hotspots were identified: the northeastern upwelling zone, the Nandu River estuary (Qiongzhou Strait), and the Changhua River estuary (western Hainan). Fish egg assemblages across at the 50 stations clustered into two distinct groups, with water depth as the primary driver of community differentiation. Indicator species of Group 1 primarily consisted of large-bodied CR and PL species, which favored spawning in waters deeper than 70 m; Group 2 was characterized by small-bodied CF and CR species, preferring shallower waters (<60 m). Water depth is the primary environmental factor driving the spatial distribution differences between the two groups. Salinity also strongly influences the distribution of fish egg density, with both groups showing similar patterns. Water temperature, latitude, and chlorophyll-a are also significant environmental factors. Our findings reveal high fish egg species richness, confirming the critical spawning ground function of the nearshore waters; the spatial pattern of egg assemblages offers vital information to inform the conservation and sustainable management of fish resources.

热带近岸水域通常拥有多样化和复杂的生态系统，支持丰富的渔业资源。它们复杂的地形和水文特征为鱼类提供了最佳的产卵栖息地。对鱼卵的种类组成和分布的调查可以对产卵地产生重要的见解，为保护工作提供实质性的价值。海南岛位于南中国海热带北部。本研究于2024年4月的产卵高峰期，在海南岛近岸水域的50个采样站采集了鱼卵。共收集卵84,030个，涵盖多个生态行业的212个分类单位：珊瑚礁相关物种（CR）、其他近岸物种（CF）、远洋物种（PL）和深海物种（DS）。确定了东北上升流区、南渡江口（琼州海峡）和昌华江口（海南西部）3个主要产卵热点。50个站点的鱼卵聚集成两个不同的群体，水深是群落分化的主要驱动因素。第1组指示种主要为大体CR和PL种，偏好在70 m以上的水域产卵；第2组以小体CF和CR种为主，偏好较浅水域（<60 m）。水深是影响两组空间分布差异的主要环境因子。盐度也强烈影响鱼卵密度的分布，两组都显示出相似的模式。水温、纬度和叶绿素a也是重要的环境因子。研究结果表明，近岸水域鱼卵种类丰富，具有重要的产卵地功能；鱼卵组合的空间格局为鱼类资源的保护和可持续管理提供了重要信息。

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引用次数: 0

Effect of grain size on microplastic occurrence and spatial distribution in the Cávado River 粒径对Cávado河微塑性发生及空间分布的影响

IF 2.4 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2026-03-01 Epub Date: 2026-02-18 DOI: 10.1016/j.rsma.2026.104863

Rui Veloso , Luís Gonçalves , Renato Henriques

The exponential growth of plastic production over recent decades has raised increasing concern regarding microplastic (MP) pollution in aquatic ecosystems. Rivers act as major conduits transporting microplastics from inland sources towards marine environments, yet their spatial distribution and accumulation within riverine sediments remain incompletely understood. In particular, the combined influence of riverine structures, sediment characteristics, and anthropogenic pressures on microplastic occurrence is still unclear. This study investigates the spatial distribution of sediment-associated microplastics along the Cávado River (Portugal), with a focus on the potential role of sediment grain size and environmental context. Sediment samples were collected from 14 sites spanning diverse environmental conditions, including urbanised, industrial, and agricultural areas. A subset of samples was subjected to granulometric analysis to assess potential relationships between grain size and microplastic abundance. Samples were processed using density separation and analysed visually under optical microscopy following a less invasive methodological approach. Results indicate a statistically supported downstream increase in microplastic abundance, with localised hotspots observed near wastewater treatment plants, industrial complexes, and urban areas. Although no significant linear relationship was identified between sediment grain size and microplastic abundance, finer sediments, characterised by higher silt and clay fractions, exhibited trends towards greater microplastic retention. These findings highlight the role of riverbed sediments as important accumulation zones for microplastics and underscore the need for spatially targeted mitigation strategies. The study contributes to improving the understanding of microplastic distribution patterns in freshwater systems and provides a basis for future investigations integrating refined sampling designs and complementary analytical approaches.

近几十年来，塑料产量的指数级增长引起了人们对水生生态系统中微塑料污染的日益关注。河流是将微塑料从内陆来源输送到海洋环境的主要管道，但它们在河流沉积物中的空间分布和积累仍不完全清楚。特别是，河流结构、沉积物特征和人为压力对微塑料发生的综合影响尚不清楚。本研究调查了Cávado河（葡萄牙）沿岸沉积物相关微塑料的空间分布，重点研究了沉积物粒度和环境背景的潜在作用。沉积物样本从14个不同环境条件的地点收集，包括城市化、工业和农业地区。样品的一个子集进行了粒度分析，以评估颗粒大小和微塑性丰度之间的潜在关系。样品使用密度分离处理，并在光学显微镜下进行视觉分析，采用侵入性较小的方法。结果表明，统计支持下游微塑料丰度的增加，在废水处理厂、工业园区和城市地区附近观察到局部热点。虽然沉积物粒度与微塑性丰度之间没有明显的线性关系，但泥沙和粘土组分含量较高的细沉积物表现出更大的微塑性滞留趋势。这些发现强调了河床沉积物作为微塑料重要积聚带的作用，并强调了制定有空间针对性的缓解战略的必要性。该研究有助于提高对淡水系统中微塑料分布模式的理解，并为整合精细采样设计和互补分析方法的未来研究提供基础。

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引用次数: 0

Compressed high-spatial-resolution imagery to train and validate seagrass percent cover mapping using sentinel-2 imagery 压缩的高空间分辨率图像，用于训练和验证使用sentinel-2图像绘制的海草覆盖百分比图

IF 2.4 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2026-03-01 Epub Date: 2026-01-27 DOI: 10.1016/j.rsma.2026.104808

Pramaditya Wicaksono , Setiawan Djody Harahap , Safina Rajwaa Ananda , Kevin Oit Benyamin , Rahma Izzatun Nabiha , Valentia Widia Maharsi

Seagrass percent cover (PC) is a key indicator of seagrass ecosystem condition, reflecting habitat quality and levels of degradation. Mapping seagrass PC using remote sensing typically requires field-based reference data for model training and validation, frequently derived from photo-quadrat surveys. An alternative approach involves indirect estimation using high-spatial-resolution imagery, including compressed imagery available through Google Earth platform (hi-res imagery). This study evaluates the effectiveness of using hi-res imagery to generate training and validation data for seagrass PC mapping with Sentinel-2 imagery. Six seagrass meadows representing a range of seagrass densities and species compositions were selected. Reference seagrass PC data were derived by analysing hi-res imagery using ISODATA unsupervised classification within grid cells corresponding to the Sentinel-2 ground sampling distance (GSD). A Random Forest (RF) regression model was then developed to map seagrass PC. Model performance was evaluated using the coefficient of determination (R²), root mean square error (RMSE), and 1:1 scatter plots. The results demonstrate that hi-res imagery can be effectively used to generate seagrass PC reference data for training and validating Sentinel-2–based RF regression models, achieving an RMSE of less than 25 %. This approach produces reference data that are spatially consistent with Sentinel-2 GSD and provides a more efficient and cost-effective alternative to extensive field photo-quadrat surveys or the acquisition of original high-resolution imagery. Integrating medium and high-spatial-resolution imagery is therefore recommended for seagrass PC mapping, as it provides a practical, scalable, and cost-effective framework for long-term seagrass ecosystem monitoring and management.

海草盖度是反映生境质量和退化程度的海草生态系统状况的重要指标。使用遥感测绘海草PC通常需要基于现场的参考数据进行模型训练和验证，这些数据通常来自照片样方调查。另一种方法是使用高空间分辨率图像进行间接估计，包括通过谷歌地球平台提供的压缩图像（高分辨率图像）。本研究评估了使用高分辨率图像生成训练和验证数据的有效性，用于使用Sentinel-2图像进行海草PC映射。选取了代表海草密度和种类组成范围的6个海草草甸。参考海草PC数据是通过对Sentinel-2地面采样距离（GSD）对应网格单元内的高分辨率图像进行ISODATA无监督分类分析得到的。然后建立随机森林（RF）回归模型来绘制海草PC图。使用决定系数（R²）、均方根误差（RMSE）和1:1散点图来评估模型的性能。结果表明，高分辨率图像可以有效地用于生成海草PC参考数据，用于训练和验证基于sentinel -2的RF回归模型，RMSE小于25% %。该方法产生的参考数据在空间上与Sentinel-2 GSD一致，为广泛的现场照片样方调查或原始高分辨率图像的获取提供了更有效和更具成本效益的替代方案。因此，建议将中、高空间分辨率图像集成到海草PC制图中，因为它为长期监测和管理海草生态系统提供了一个实用、可扩展且经济有效的框架。

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引用次数: 0

Heavy metal contamination in the commune of Taltal- Chile: Analysis of soils and sediments in different granulometric fractions 塔尔塔尔-智利公社的重金属污染：不同颗粒级土壤和沉积物的分析

IF 2.4 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2026-03-01 Epub Date: 2026-01-31 DOI: 10.1016/j.rsma.2026.104823

Daimo Villegas-Inostroza, Isabel Pizarro-Veas, Kelly Nuñez-Pérez

Heavy metal contamination in coastal environments represents a significant threat to aquatic ecosystems and human health. Such is the case with the commune of Taltal, a place which has two tailings’ piles within the coastal urban area in a recreational zone and adjacent to a school. This study evaluates the distribution and retention mechanisms of heavy metals in coastal sediments of northern Chile, considering different areas (Cifuncho, Paposo, Playa Atacama and Tierra del Morro) and environmental matrices (sediment and soil), the influence of the granulometric fraction (2000, 250 and 63 µm) and physicochemical parameters. ANOVA, boxplots and Pearson correlation matrices were applied. The results show that the Playa Atacama sector has the highest metal load, with high concentrations of Arsenic (72.15 mg/kg), Copper (4576.36 mg/kg), Lead (1841.17 mg/kg), Zinc (388.31 mg/kg), Ni (107,7 mg/kg), Cr (261 mg/kg) and Mercury (1.94 mg/kg), associated with the presence of mining liabilities in the area. The fine fraction of the sediment (63 µm) concentrated the highest levels of metals in the order of 70,mg/kg for arsenic up to 4500 mg/kg for copper and 1800 mg/kg for lead, standing out as a critical unit for mobility and environmental risk studies. The correlation heat map revealed significant associations (r > 0.90) between metals and parameters such as organic carbon, organic matter, pH and conductivity, suggesting immobilization mechanisms under alkaline and oxidizing conditions. In conclusion, playa Atacama and Paposo showed the highest levels of As, Cu and Pb.

沿海环境中的重金属污染对水生生态系统和人类健康构成重大威胁。塔尔塔尔公社的情况就是这样，这个地方在沿海市区的一个休闲区和一所学校附近有两个尾矿堆。本研究评估了智利北部沿海沉积物中重金属的分布和滞留机制，考虑了不同地区（Cifuncho、Paposo、Playa Atacama和Tierra del Morro）和环境基质（沉积物和土壤），颗粒分数（2000、250和63 µm）和物理化学参数的影响。采用方差分析、箱线图和Pearson相关矩阵。结果表明，Playa Atacama地区的金属负荷最高，砷（72.15 mg/kg）、铜（4576.36 mg/kg）、铅（1841.17 mg/kg）、锌（388.31 mg/kg）、镍（1077 mg/kg）、铬（261 mg/kg）和汞（1.94 mg/kg）的浓度较高，与该地区存在采矿负债有关。沉积物的细碎部分（63 µm）集中了最高水平的金属，砷为70mg /kg，铜为4500 mg/kg，铅为1800 mg/kg，是流动性和环境风险研究的关键单位。相关热图显示，金属与有机碳、有机质、pH和电导率等参数之间存在显著相关性（r >； 0.90），提示了在碱性和氧化条件下的固定机制。综上所述，playa Atacama和Paposo的As、Cu和Pb含量最高。

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引用次数: 0

Personal protective equipment (PPE) pollution assessment after the COVID-19 pandemic along the coast of the Strait of Messina, Italy 意大利墨西拿海峡沿岸2019冠状病毒病大流行后个人防护装备污染评估

IF 2.4 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2026-03-01 Epub Date: 2026-02-05 DOI: 10.1016/j.rsma.2026.104840

Shabab Hussain , Mariachiara Costanzo , Sergio Famulari , Claudio D’Iglio , Nunziacarla Spanò , Serena Savoca

As a result of the COVID-19 pandemic, plastic pollution has increased considerably worldwide due to the discharge of personal protective equipment (PPE) into aquatic environments. The aim of this study is to evaluate the pollution rate caused by PPE along the coasts of the Strait of Messina (Italy). From June 2022 to May 2023, nine sampling sites were inspected using transects to collect PPE, including facemasks, face shields and surgical gloves. A total of 143 PPE was found in an area of 14 545 km² of beach. Face masks were the most commonly found PPE (n = 92, 64.4 %) compared to gloves (n = 51, 35.6 %). The density of PPE was 1.08 × 10⁻² PPE m⁻². The results suggest lack of awareness, negligence in the waste management system, and poor implementation of policies on plastic pollution, with serious impacts on the health of coastal environments.

由于2019冠状病毒病大流行，由于个人防护装备（PPE）排放到水生环境中，全球塑料污染大幅增加。本研究的目的是评估PPE对意大利墨西拿海峡沿岸的污染率。从2022年6月至2023年5月，使用样带检查了9个采样点，收集了包括口罩、面罩和外科手套在内的个人防护装备。在14 545 平方公里的海滩区域共发现143个个人防护装备。口罩是最常见的PPE (n = 92,64.4 %)，手套（n = 51,35.6 %）。PPE密度为1.08 × 10−2 PPE m−2。结果表明，缺乏意识，废物管理系统的疏忽，以及塑料污染政策的执行不力，严重影响了沿海环境的健康。

引用次数: 0