Estuarine Coastal and Shelf Science最新文献_第9页

Microplastics in the surface water of three Egyptian northern lakes 埃及北部三个湖泊地表水中的微塑料

IF 2.6 3区地球科学 Q1 MARINE & FRESHWATER BIOLOGY

Estuarine Coastal and Shelf Science

Pub Date : 2026-02-01 Epub Date: 2025-12-10 DOI: 10.1016/j.ecss.2025.109661

Soha H. Shabaka, Abeer A.M. El-Sayed, Safaa A. Abdel Ghani, Aida H. Shobier, Mohamed A. Shreadah

Microplastics (MPs) are widespread pollutants, yet limited data exist on their distribution in coastal lagoon systems. This study aimed to evaluate MPs pollution in surface water of three Egyptian northern lakes: Manzala, Edku, which are linked to the Mediterranean Sea and inland Mariout Lake. Water samples were collected using a 300 μm manta trawl, and MPs were quantified and characterized. The results showed average concentrations of 0.82 ± 0.70, 0.09 ± 0.06, 0.33 ± 0.19 particles/m³ for Manzala, Edku and Mariout lakes, respectively. The dominant MPs shapes included transparent films (46.10 % in Manzala and 36.35 % in Mariout) and red fibers (69.19 % in Edku). Fourier-transform infrared spectroscopy (FTIR-ATR) identified polypropylene (PP), polystyrene (PS) and polyethylene (PE) as the predominant polymers. The high abundance of PP reflects the role of anthropogenic sources, such as domestic sewage, fishing waste, and agricultural runoff. Differential Scanning Calorimetry (DSC) analysis detected other polymer types in smaller proportions. The Pollution Load Index (PLI) indicated low-risk levels (mean values < 10) across all lakes. However, the Polymer Hazard Index (PHI) revealed that Edku Lake (PHI >10, Category II) posed a higher risk, while Manzala and Mariout Lakes fell into a lower-risk category. As the first study to document MPs pollution in these lakes, our work establishes a critical baseline for future monitoring and highlights the potential for these ecosystems to act as conduits for MPs entering the Mediterranean. Targeted management strategies to mitigate MPs inputs into these interconnected aquatic systems are urgently needed.

微塑料（MPs）是一种广泛存在的污染物，但关于其在沿海泻湖系统中的分布数据有限。这项研究旨在评估埃及北部三个湖泊地表水中的MPs污染：Manzala， Edku，这三个湖泊与地中海和内陆的Mariout湖相连。采用300 μm蝠鲼拖网采集水样，对MPs进行定量和表征。结果表明，Manzala湖、Edku湖和Mariout湖的平均浓度分别为0.82±0.70、0.09±0.06、0.33±0.19颗粒/m3。MPs的主要形态包括透明膜（Manzala为46.10%，Mariout为36.35%）和红色纤维（Edku为69.19%）。傅里叶变换红外光谱（FTIR-ATR）鉴定聚丙烯（PP）、聚苯乙烯（PS）和聚乙烯（PE）为主要聚合物。PP的高丰度反映了人为来源的作用，如生活污水、渔业废物和农业径流。差示扫描量热法（DSC）分析检测到其他类型的聚合物在较小的比例。污染负荷指数（PLI）显示所有湖泊的低风险水平（平均值<； 10）。然而，聚合物危害指数（PHI）显示，Edku湖（PHI >10， II类）具有较高的风险，而Manzala和Mariout湖属于较低的风险类别。作为第一个记录这些湖泊中MPs污染的研究，我们的工作为未来的监测建立了一个关键的基线，并强调了这些生态系统作为MPs进入地中海通道的潜力。迫切需要有针对性的管理战略，以减少MPs对这些相互关联的水生系统的投入。

{"title":"Microplastics in the surface water of three Egyptian northern lakes","authors":"Soha H. Shabaka, Abeer A.M. El-Sayed, Safaa A. Abdel Ghani, Aida H. Shobier, Mohamed A. Shreadah","doi":"10.1016/j.ecss.2025.109661","DOIUrl":"10.1016/j.ecss.2025.109661","url":null,"abstract":"<div><div>Microplastics (MPs) are widespread pollutants, yet limited data exist on their distribution in coastal lagoon systems. This study aimed to evaluate MPs pollution in surface water of three Egyptian northern lakes: Manzala, Edku, which are linked to the Mediterranean Sea and inland Mariout Lake. Water samples were collected using a 300 μm manta trawl, and MPs were quantified and characterized. The results showed average concentrations of 0.82 ± 0.70, 0.09 ± 0.06, 0.33 ± 0.19 particles/m<sup>3</sup> for Manzala, Edku and Mariout lakes, respectively. The dominant MPs shapes included transparent films (46.10 % in Manzala and 36.35 % in Mariout) and red fibers (69.19 % in Edku). Fourier-transform infrared spectroscopy (FTIR-ATR) identified polypropylene (PP), polystyrene (PS) and polyethylene (PE) as the predominant polymers. The high abundance of PP reflects the role of anthropogenic sources, such as domestic sewage, fishing waste, and agricultural runoff. Differential Scanning Calorimetry (DSC) analysis detected other polymer types in smaller proportions. The Pollution Load Index (PLI) indicated low-risk levels (mean values < 10) across all lakes. However, the Polymer Hazard Index (PHI) revealed that Edku Lake (PHI >10, Category II) posed a higher risk, while Manzala and Mariout Lakes fell into a lower-risk category. As the first study to document MPs pollution in these lakes, our work establishes a critical baseline for future monitoring and highlights the potential for these ecosystems to act as conduits for MPs entering the Mediterranean. Targeted management strategies to mitigate MPs inputs into these interconnected aquatic systems are urgently needed.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"329 ","pages":"Article 109661"},"PeriodicalIF":2.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145737151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Linking the trophodynamics of the ghost crab Ocypode quadrata (Fabricius, 1787) to natural habitat modification on sandy beaches 鬼蟹（fabicius, 1787）滋养动力学与沙地自然生境改造的关系

IF 2.6 3区地球科学 Q1 MARINE & FRESHWATER BIOLOGY

Estuarine Coastal and Shelf Science

Pub Date : 2026-01-01 Epub Date: 2025-11-10 DOI: 10.1016/j.ecss.2025.109608

Ligia Salgado Bechara , Rafael Duarte Monteiro , Gustavo Mattos , Arthur Bauer , Pedro Vianna Gatts , Maurício Mussi Molisani , Luciano Gomes Fischer , Carlos Eduardo Rezende , Yasmina Esmaeili , Patrícia Luciano Mancini , Carlos Alberto Barboza

The ghost crab species Ocypode quadrata is a key crustacean inhabitant of sandy beaches along the Western Atlantic coast, playing a crucial role in beach food webs. In this study, we describe and compare the trophic ecology of O. quadrata on beaches with varying levels of urbanization in Rio de Janeiro, Brazil. We utilized a combination of stomach content analysis (frequency of occurrence, FO%) and stable isotope analysis of δ¹⁵N and δ¹³C (isotopic niche and mixing models) in O. quadrata and their primary prey sources. Our results indicated that both marine and terrestrial sources play key roles in the trophic ecology of the ghost crab Ocypode quadrata, highlighting its function in energy transfer across coastal ecosystems. Although no differences were found in assimilated food proportions between urbanized and non-urbanized beaches, broader isotopic niches on less urbanized areas suggest that natural habitat modification may constrain the species’ trophic niche. Isotopic niche breadths indicated similar dietary patterns and habitat use across beaches, though individuals from low urbanized areas exhibited broader niches, suggesting greater resource diversity use. We observed high isotopic niche overlap (>50 %), with a nested pattern where the low urbanized sector encompassed the dietary niches of urbanized ones. Conversely, mixing models highlighted a greater assimilation of Emerita brasiliensis across all beaches, emphasizing a preference for high-calorie food sources when available. Higher δ¹³C values further supported an association with marine-derived resources. The trophic ecology of O. quadrata offers valuable insights into the connectivity between biological complexes and adjacent ecosystems, contributing to a landscape approach.

鬼蟹是西大西洋海岸沙滩上的一种重要的甲壳类动物，在海滩食物网中起着至关重要的作用。在这项研究中，我们描述并比较了巴西巴西里约热内卢不同城市化水平的海滩上的O. quadrata的营养生态。采用胃内容物分析（出现频率，FO%）和δ15N和δ13C稳定同位素分析（同位素生态位和混合模型）相结合的方法，分析了方腹圆齿圆齿及其主要猎物来源的δ15N和δ13C。我们的研究结果表明，海洋和陆地源在鬼蟹的营养生态学中都起着关键作用，突出了其在沿海生态系统中能量转移的功能。虽然城市化海滩和非城市化海滩在同化食物比例上没有发现差异，但在城市化程度较低的地区，更广泛的同位素生态位表明，自然栖息地的改变可能限制了物种的营养生态位。同位素生态位宽度表明不同海滩的饮食模式和栖息地利用相似，尽管低城市化地区的个体表现出更广泛的生态位，表明更大的资源多样性利用。我们观察到高同位素生态位重叠（> 50%），具有嵌套模式，即低城市化部门包含城市化部门的饮食生态位。相反，混合模型强调了在所有海滩上对巴西Emerita brasiliensis的更大同化，强调了它们对高热量食物来源的偏好。较高的δ13C值进一步支持了与海源资源的关联。方形草的营养生态学为研究生物复合体和邻近生态系统之间的连通性提供了有价值的见解，有助于景观研究。

{"title":"Linking the trophodynamics of the ghost crab Ocypode quadrata (Fabricius, 1787) to natural habitat modification on sandy beaches","authors":"Ligia Salgado Bechara , Rafael Duarte Monteiro , Gustavo Mattos , Arthur Bauer , Pedro Vianna Gatts , Maurício Mussi Molisani , Luciano Gomes Fischer , Carlos Eduardo Rezende , Yasmina Esmaeili , Patrícia Luciano Mancini , Carlos Alberto Barboza","doi":"10.1016/j.ecss.2025.109608","DOIUrl":"10.1016/j.ecss.2025.109608","url":null,"abstract":"<div><div>The ghost crab species <em>Ocypode quadrata</em> is a key crustacean inhabitant of sandy beaches along the Western Atlantic coast, playing a crucial role in beach food webs. In this study, we describe and compare the trophic ecology of <em>O. quadrata</em> on beaches with varying levels of urbanization in Rio de Janeiro, Brazil. We utilized a combination of stomach content analysis (frequency of occurrence, FO%) and stable isotope analysis of <em>δ</em><sup>15</sup>N and <em>δ</em><sup>13</sup>C (isotopic niche and mixing models) in <em>O. quadrata</em> and their primary prey sources. Our results indicated that both marine and terrestrial sources play key roles in the trophic ecology of the ghost crab <em>Ocypode quadrata</em>, highlighting its function in energy transfer across coastal ecosystems. Although no differences were found in assimilated food proportions between urbanized and non-urbanized beaches, broader isotopic niches on less urbanized areas suggest that natural habitat modification may constrain the species’ trophic niche. Isotopic niche breadths indicated similar dietary patterns and habitat use across beaches, though individuals from low urbanized areas exhibited broader niches, suggesting greater resource diversity use. We observed high isotopic niche overlap (>50 %), with a nested pattern where the low urbanized sector encompassed the dietary niches of urbanized ones. Conversely, mixing models highlighted a greater assimilation of <em>Emerita brasiliensis</em> across all beaches, emphasizing a preference for high-calorie food sources when available. Higher <em>δ</em><sup>13</sup>C values further supported an association with marine-derived resources. The trophic ecology of <em>O. quadrata</em> offers valuable insights into the connectivity between biological complexes and adjacent ecosystems, contributing to a landscape approach.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"328 ","pages":"Article 109608"},"PeriodicalIF":2.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145579986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Eulerian–Lagrangian simulation of wave-induced microplastic dispersion in nearshore zones: Processes and implications 欧拉-拉格朗日模拟近岸区波浪引起的微塑性色散：过程和意义

IF 2.6 3区地球科学 Q1 MARINE & FRESHWATER BIOLOGY

Estuarine Coastal and Shelf Science

Pub Date : 2026-01-01 Epub Date: 2025-11-21 DOI: 10.1016/j.ecss.2025.109626

Abbasali Rahmani , Alessandro Stocchino

Microplastics are a pervasive marine pollutant, threatening coastal ecosystems and biodiversity. Understanding nearshore transport and dispersion is crucial for predicting microplastics’ fate and mitigating impacts. This study employs an Eulerian–Lagrangian model to simulate spherical microplastics, accounting for inertia and buoyancy, under regular and irregular waves in the nearshore region. Using realistic size–density distributions, the simulated particles range from non-buoyant to buoyant and from weakly to highly inertial. The shear layer, formed by Stokes drift and undertow, drives buoyant microplastics shoreward, controlling non-buoyant trajectories. The breaking region acts as a natural barrier, with few low-density, inertial particles passing through and potentially settling above the swash zone, while non-passing particles accumulate in the shoaling zone. Particle–wave characteristics are linked through dimensionless parameters, and we propose applicable dimensionless diffusive coefficients of

K_{h}^{(1)} T / L_{0}^{2} \approx O (1 0^{- 4})

and

K_{v}^{(1)} T / L_{0}^{2} \approx O (1 0^{- 5})

. Dispersion regimes transit from initial ballistic to subdiffusive within 10 wave periods. The subsequent superdiffusive regime is governed primarily by wave steepness and weakly by depth, particle density, and size. However, the absence of a sustained diffusive regime indicates diffusion coefficients may misestimate nearshore microplastic concentrations.

微塑料是一种普遍存在的海洋污染物，威胁着沿海生态系统和生物多样性。了解近岸运输和扩散对于预测微塑料的命运和减轻影响至关重要。本研究采用欧拉-拉格朗日模型模拟了近岸地区规则波和不规则波作用下的球形微塑料，考虑了惯性和浮力。使用真实的尺寸-密度分布，模拟的颗粒范围从无浮力到浮力，从弱惯性到高惯性。由斯托克斯漂流和底流形成的剪切层驱动浮力微塑料向岸边移动，控制非浮力轨迹。破碎区是一个天然屏障，很少有低密度的惯性粒子通过，并可能在冲刷带上方沉降，而未通过的粒子则聚集在浅滩带。粒子波特性通过无量纲参数联系起来，提出了适用的无量纲扩散系数Kh(1)T/L02≈O（10−4）和Kv(1)T/L02≈O（10−5）。色散状态在10个波周期内从初始弹道过渡到次扩散。随后的超扩散状态主要受波浪陡度的影响，而受深度、粒子密度和大小的影响较小。然而，缺乏持续扩散状态表明扩散系数可能会错误估计近岸微塑料浓度。

{"title":"Eulerian–Lagrangian simulation of wave-induced microplastic dispersion in nearshore zones: Processes and implications","authors":"Abbasali Rahmani , Alessandro Stocchino","doi":"10.1016/j.ecss.2025.109626","DOIUrl":"10.1016/j.ecss.2025.109626","url":null,"abstract":"<div><div>Microplastics are a pervasive marine pollutant, threatening coastal ecosystems and biodiversity. Understanding nearshore transport and dispersion is crucial for predicting microplastics’ fate and mitigating impacts. This study employs an Eulerian–Lagrangian model to simulate spherical microplastics, accounting for inertia and buoyancy, under regular and irregular waves in the nearshore region. Using realistic size–density distributions, the simulated particles range from non-buoyant to buoyant and from weakly to highly inertial. The shear layer, formed by Stokes drift and undertow, drives buoyant microplastics shoreward, controlling non-buoyant trajectories. The breaking region acts as a natural barrier, with few low-density, inertial particles passing through and potentially settling above the swash zone, while non-passing particles accumulate in the shoaling zone. Particle–wave characteristics are linked through dimensionless parameters, and we propose applicable dimensionless diffusive coefficients of <span><math><mrow><msubsup><mrow><mi>K</mi></mrow><mrow><mi>h</mi></mrow><mrow><mrow><mo>(</mo><mn>1</mn><mo>)</mo></mrow></mrow></msubsup><mi>T</mi><mo>/</mo><msubsup><mrow><mi>L</mi></mrow><mrow><mn>0</mn></mrow><mrow><mn>2</mn></mrow></msubsup><mo>≈</mo><mi>O</mi><mrow><mo>(</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>4</mn></mrow></msup><mo>)</mo></mrow></mrow></math></span> and <span><math><mrow><msubsup><mrow><mi>K</mi></mrow><mrow><mi>v</mi></mrow><mrow><mrow><mo>(</mo><mn>1</mn><mo>)</mo></mrow></mrow></msubsup><mi>T</mi><mo>/</mo><msubsup><mrow><mi>L</mi></mrow><mrow><mn>0</mn></mrow><mrow><mn>2</mn></mrow></msubsup><mo>≈</mo><mi>O</mi><mrow><mo>(</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>5</mn></mrow></msup><mo>)</mo></mrow></mrow></math></span>. Dispersion regimes transit from initial ballistic to subdiffusive within 10 wave periods. The subsequent superdiffusive regime is governed primarily by wave steepness and weakly by depth, particle density, and size. However, the absence of a sustained diffusive regime indicates diffusion coefficients may misestimate nearshore microplastic concentrations.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"328 ","pages":"Article 109626"},"PeriodicalIF":2.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145579988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Seasonal modulation of the spring-neap response of Yangtze Estuary turbidity maximum: Movement, amplitude, and phase lag via remote sensing 长江口浊度最大值春小潮响应的季节调节：运动、幅度和相位滞后的遥感分析

IF 2.6 3区地球科学 Q1 MARINE & FRESHWATER BIOLOGY

Estuarine Coastal and Shelf Science

Pub Date : 2026-01-01 Epub Date: 2025-11-14 DOI: 10.1016/j.ecss.2025.109624

Jie Feng , Qian Yu , Shiyi Cao , Zhiyun Du , Hangjie Lin , Ya Ping Wang , Yunwei Wang

Estuarine turbidity maximum zones (ETMs) exhibit significant spring-neap and seasonal variations. Quantifying these dynamics from sparse, long-term remote sensing data is crucial for understanding ETM evolution. Using hourly GOCI satellite imagery (2011–2021) from the Yangtze Estuary, we applied Lomb-Scargle periodogram and phase-folded methods to extract the horizontal movement characteristics (amplitude and phase) of the ETM, tracked via 150, 100, and 50 mg/L SSC isolines. We found that the ETM extent has obvious spring-neap variations that lag the tidal cycle. Notably, high-SSC regions showed heightened sensitivity to tidal forcing: the 150 mg/L isoline had a larger amplitude (5.05 km) and shorter lag (1.42 days) compared to the 50 mg/L isoline (4.29 km amplitude, 1.99-day lag). Both amplitude and phase also exhibited significant seasonality. The phase lag proved highly sensitive to these seasonal changes: it was most pronounced in summer (a 2.44-day lag), decreased in spring (1.32 days) and autumn (0.65 days), and became a slight phase lead in winter (−0.13 days). These seasonal dynamics are linked to variations in sediment supply, waves, and river discharge. This study's approach provides a robust framework for extracting ETM spring-neap characteristics from sparse satellite data, clarifying multi-timescale ETM responses for similar estuarine studies.

河口浊度最大值带（ETMs）表现出明显的春季小潮和季节变化。从稀疏的长期遥感数据中量化这些动态对于理解ETM的演变至关重要。利用2011-2021年长江口逐时GOCI卫星影像，采用Lomb-Scargle周期图和相位折叠方法提取了150、100和50 mg/L SSC等值线追踪的ETM水平运动特征（振幅和相位）。研究发现，东海道ETM范围存在明显的春季-小潮变化，滞后于潮汐周期。值得注意的是，高ssc区域对潮汐强迫表现出更高的敏感性：与50 mg/L等值线（振幅4.29 km，滞后1.99 d）相比，150 mg/L等值线的振幅更大（5.05 km），滞后时间更短（1.42 d）。振幅和相位也表现出明显的季节性。相位滞后对这些季节变化非常敏感，夏季最明显（滞后2.44 d），春季（滞后1.32 d）和秋季（滞后0.65 d）减弱，冬季（滞后- 0.13 d）略有领先。这些季节性动态与泥沙供应、波浪和河流流量的变化有关。该方法为从稀疏的卫星数据中提取ETM春季小潮特征提供了一个强大的框架，为类似的河口研究阐明了多时间尺度的ETM响应。

{"title":"Seasonal modulation of the spring-neap response of Yangtze Estuary turbidity maximum: Movement, amplitude, and phase lag via remote sensing","authors":"Jie Feng , Qian Yu , Shiyi Cao , Zhiyun Du , Hangjie Lin , Ya Ping Wang , Yunwei Wang","doi":"10.1016/j.ecss.2025.109624","DOIUrl":"10.1016/j.ecss.2025.109624","url":null,"abstract":"<div><div>Estuarine turbidity maximum zones (ETMs) exhibit significant spring-neap and seasonal variations. Quantifying these dynamics from sparse, long-term remote sensing data is crucial for understanding ETM evolution. Using hourly GOCI satellite imagery (2011–2021) from the Yangtze Estuary, we applied Lomb-Scargle periodogram and phase-folded methods to extract the horizontal movement characteristics (amplitude and phase) of the ETM, tracked via 150, 100, and 50 mg/L SSC isolines. We found that the ETM extent has obvious spring-neap variations that lag the tidal cycle. Notably, high-SSC regions showed heightened sensitivity to tidal forcing: the 150 mg/L isoline had a larger amplitude (5.05 km) and shorter lag (1.42 days) compared to the 50 mg/L isoline (4.29 km amplitude, 1.99-day lag). Both amplitude and phase also exhibited significant seasonality. The phase lag proved highly sensitive to these seasonal changes: it was most pronounced in summer (a 2.44-day lag), decreased in spring (1.32 days) and autumn (0.65 days), and became a slight phase lead in winter (−0.13 days). These seasonal dynamics are linked to variations in sediment supply, waves, and river discharge. This study's approach provides a robust framework for extracting ETM spring-neap characteristics from sparse satellite data, clarifying multi-timescale ETM responses for similar estuarine studies.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"328 ","pages":"Article 109624"},"PeriodicalIF":2.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145579985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Soft-sediment surrogacy: acoustic remote sensing relates more strongly to marine sediment eDNA than to infauna 软沉积物替代：声学遥感与海洋沉积物eDNA的关系比与动物的关系更强

IF 2.6 3区地球科学 Q1 MARINE & FRESHWATER BIOLOGY

Estuarine Coastal and Shelf Science

Pub Date : 2026-01-01 Epub Date: 2025-11-04 DOI: 10.1016/j.ecss.2025.109592

Raphael F. Burkart-Radtke , Emma L. Johnston , Tim Ingleton , Charlotte Beloe , Sebastian Vadillo Gonzalez , Graeme F. Clark

Predicting sediment infaunal biodiversity at ecologically relevant scales remains a major challenge for marine biomonitoring due to the costly and time-intensive nature of direct point sampling. This study evaluates the potential of remotely sensed acoustic variables as surrogates for infaunal biodiversity by modelling abiotic-biotic relationships. Critically, it compares the performance of traditional morphological identification with genomic (eDNA metabarcoding) techniques as an advancement to biological data collection in this context. Sediment grab samples and co-located multibeam acoustic data were collected from Sydney Harbour, Australia, to model biodiversity patterns using both taxonomic approaches. Modelling of the morphological data showed limited relationships with acoustic variables across standard diversity metrics (species richness, Shannon diversity, total abundance), and models were highly driven by sediment grain size. In contrast, diversity metrics from eDNA data revealed more consistent correlations with acoustic variables, particularly, topographic position index, slope, and planar curvature. These findings demonstrate that eDNA methods can improve the detection of abiotic-biotic relationships, likely due to greater taxonomic resolution and sensitivity. The integration of genomic tools with remote sensing offers the potential for a scalable, cost-effective pathway for mapping and monitoring infaunal biodiversity in heterogeneous benthic sedimentary systems. This combined approach enhances our ability to detect ecological patterns and supports more effective environmental assessment and management in estuarine and coastal ecosystems.

由于直接点采样的成本高、耗时长，在生态相关尺度上预测沉积物和动物的生物多样性仍然是海洋生物监测的一个主要挑战。本研究通过模拟非生物-生物关系来评估遥感声学变量作为动物生物多样性替代品的潜力。关键的是，它比较了传统形态学鉴定与基因组（eDNA元条形码）技术的性能，作为在这种情况下生物数据收集的进步。从澳大利亚悉尼港收集沉积物样本和同位置的多波束声学数据，使用这两种分类方法来模拟生物多样性模式。形态学数据的建模显示，在标准多样性指标（物种丰富度、香农多样性、总丰度）中，声学变量与形态学数据的关系有限，模型高度受沉积物粒度驱动。相比之下，来自eDNA数据的多样性指标显示与声学变量，特别是地形位置指数、坡度和面曲率的相关性更为一致。这些发现表明，eDNA方法可以提高非生物-生物关系的检测，可能是由于更高的分类分辨率和灵敏度。基因组工具与遥感的结合为绘制和监测非均质底栖沉积系统中的动物生物多样性提供了一种可扩展的、具有成本效益的途径。这种综合方法提高了我们探测生态格局的能力，并支持对河口和沿海生态系统进行更有效的环境评估和管理。

{"title":"Soft-sediment surrogacy: acoustic remote sensing relates more strongly to marine sediment eDNA than to infauna","authors":"Raphael F. Burkart-Radtke , Emma L. Johnston , Tim Ingleton , Charlotte Beloe , Sebastian Vadillo Gonzalez , Graeme F. Clark","doi":"10.1016/j.ecss.2025.109592","DOIUrl":"10.1016/j.ecss.2025.109592","url":null,"abstract":"<div><div>Predicting sediment infaunal biodiversity at ecologically relevant scales remains a major challenge for marine biomonitoring due to the costly and time-intensive nature of direct point sampling. This study evaluates the potential of remotely sensed acoustic variables as surrogates for infaunal biodiversity by modelling abiotic-biotic relationships. Critically, it compares the performance of traditional morphological identification with genomic (eDNA metabarcoding) techniques as an advancement to biological data collection in this context. Sediment grab samples and co-located multibeam acoustic data were collected from Sydney Harbour, Australia, to model biodiversity patterns using both taxonomic approaches. Modelling of the morphological data showed limited relationships with acoustic variables across standard diversity metrics (species richness, Shannon diversity, total abundance), and models were highly driven by sediment grain size. In contrast, diversity metrics from eDNA data revealed more consistent correlations with acoustic variables, particularly, topographic position index, slope, and planar curvature. These findings demonstrate that eDNA methods can improve the detection of abiotic-biotic relationships, likely due to greater taxonomic resolution and sensitivity. The integration of genomic tools with remote sensing offers the potential for a scalable, cost-effective pathway for mapping and monitoring infaunal biodiversity in heterogeneous benthic sedimentary systems. This combined approach enhances our ability to detect ecological patterns and supports more effective environmental assessment and management in estuarine and coastal ecosystems.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"328 ","pages":"Article 109592"},"PeriodicalIF":2.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145624790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The combined effects of salinity and inundation on bryophyte coverage and species distribution, a tidal mesocosm experiment 盐度和淹没对苔藓植物盖度和物种分布的联合影响——潮汐中生态试验

IF 2.6 3区地球科学 Q1 MARINE & FRESHWATER BIOLOGY

Estuarine Coastal and Shelf Science

Pub Date : 2026-01-01 Epub Date: 2025-11-25 DOI: 10.1016/j.ecss.2025.109630

Roy Münstermann , Katharina Wilfert , Dirk De Beer , Stijn Baeten , Tom Maris , Jonas Schoelynck

Freshwater tidal marshes are dynamic and productive ecosystems that provide habitats to a variety of plant communities. Bryophytes are one of these communities that can play an important role in colonization as pioneers in newly developing tidal nature. This study aimed to discover the effect of inundation, salinity, and soil texture on bryophyte diversity and abundance in a controlled mesocosm setting. In contrast to our hypothesis, we found that bryophyte coverage and diversity were highest under saline circumstances with a low inundation frequency. Additionally, we found that silty loam soils had increased bryophyte coverage compared to silty loam soils mixed with gravel. These results indicate that multiple environmental factors can be important drivers of bryophyte community characteristics in tidal ecosystems. Lastly, this study successfully estimated vegetation cover using machine learning based image classification, proving the usefulness of this technique for mesoscale setups.

淡水潮汐沼泽是充满活力和生产力的生态系统，为各种植物群落提供栖息地。苔藓植物是这些群落中的一员，在新发展的潮汐自然中可以作为拓荒者在定植中发挥重要作用。本研究旨在探讨在受控的中生态环境下，淹没、盐度和土壤质地对苔藓植物多样性和丰度的影响。与我们的假设相反，我们发现苔藓植物盖度和多样性在低淹没频率的盐水环境下最高。此外，我们发现粉质壤土的苔藓盖度比粉质壤土混合砾石的苔藓盖度更高。这些结果表明，多种环境因素可能是潮汐生态系统苔藓植物群落特征的重要驱动因素。最后，本研究使用基于机器学习的图像分类成功估计了植被覆盖，证明了该技术对中尺度设置的有用性。

{"title":"The combined effects of salinity and inundation on bryophyte coverage and species distribution, a tidal mesocosm experiment","authors":"Roy Münstermann , Katharina Wilfert , Dirk De Beer , Stijn Baeten , Tom Maris , Jonas Schoelynck","doi":"10.1016/j.ecss.2025.109630","DOIUrl":"10.1016/j.ecss.2025.109630","url":null,"abstract":"<div><div>Freshwater tidal marshes are dynamic and productive ecosystems that provide habitats to a variety of plant communities. Bryophytes are one of these communities that can play an important role in colonization as pioneers in newly developing tidal nature. This study aimed to discover the effect of inundation, salinity, and soil texture on bryophyte diversity and abundance in a controlled mesocosm setting. In contrast to our hypothesis, we found that bryophyte coverage and diversity were highest under saline circumstances with a low inundation frequency. Additionally, we found that silty loam soils had increased bryophyte coverage compared to silty loam soils mixed with gravel. These results indicate that multiple environmental factors can be important drivers of bryophyte community characteristics in tidal ecosystems. Lastly, this study successfully estimated vegetation cover using machine learning based image classification, proving the usefulness of this technique for mesoscale setups.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"328 ","pages":"Article 109630"},"PeriodicalIF":2.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145624793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spatial and temporal modelling of seagrass distribution in Moreton Bay, Australia, based on long-term citizen science data 基于长期公民科学数据的澳大利亚摩顿湾海草分布时空模拟

IF 2.6 3区地球科学 Q1 MARINE & FRESHWATER BIOLOGY

Estuarine Coastal and Shelf Science

Pub Date : 2026-01-01 Epub Date: 2025-11-12 DOI: 10.1016/j.ecss.2025.109611

E. Ovsyanikova , W.N. Venables , J.W. Udy

Seagrasses are essential for coastal carbon sequestration and the survival of marine fauna worldwide. Regular seagrass monitoring is essential for coastal conservation as such areas are susceptible to rapid decline usually due to anthropogenic influence. We used long-term (2015–2021) supervised citizen science data collected in Moreton Bay (Quandamooka), Australia, to investigate temporal change over a seven-year period and developed a random forest seagrass distribution model, using depth, water quality, and other predictor variables. We used hierarchical clustering to define seagrass groupings, which resulted in five clusters, named after the dominant seagrass species: ‘OS’ (Oceana serrulata), ‘ZM’ (Zostera muelleri), ‘HS’ (Halophila spinulosa), ‘HO’ (Halophila ovalis), and ‘Sparse’, the cluster with little or no seagrass present. To investigate temporal change in seagrass meadows during our study period, we conducted a longitudinal analysis of overall seagrass cover and seagrass cluster dominance using areas that had a sufficient number of samples in at least three consecutive time periods.

The predictive model produced a probability map of seagrass occurrence in Moreton Bay, explaining 86.7 % of the variability. It highlighted areas of the bay that would suffer from continuing water quality decline. Longitudinal analysis showed a decrease in seagrass presence in shallow water areas, of several areas of the bay across the study period (2015–2021), and changes in seagrass community composition across the bay.

Our results demonstrate the effective use of citizen science-collected data and statistical modelling techniques to understand the spatial and temporal variability of seagrass communities.

海草对沿海固碳和全球海洋动物的生存至关重要。定期监测海草对海岸保护至关重要，因为这些地区通常由于人为影响而容易迅速减少。我们使用在澳大利亚莫顿湾（Quandamooka）收集的长期（2015-2021）监督公民科学数据，研究了7年期间的时间变化，并使用深度、水质和其他预测变量开发了随机森林海草分布模型。我们使用分层聚类来定义海草群，结果得到了五个以优势海草物种命名的群集：‘ OS ’ （Oceana serrulata）， ‘ ZM ’ （Zostera muelleri）， ‘ HS ’ （Halophila spinulosa）， ‘ HO ’ （Halophila ovalis）和‘ Sparse ’（很少或没有海草存在的群集）。为了调查研究期间海草草甸的时间变化，我们对总体海草覆盖和海草集群优势度进行了纵向分析，使用至少连续三个时间段的样本数量足够的区域。该预测模型生成了莫尔顿湾海草发生的概率图，解释了86.7%的变异性。它强调了海湾地区将遭受水质持续下降的影响。纵向分析显示，在研究期间（2015-2021年），海湾几个地区的浅水区海草数量减少，整个海湾的海草群落组成发生了变化。我们的研究结果展示了公民科学收集数据和统计建模技术的有效使用，以了解海草群落的时空变化。

{"title":"Spatial and temporal modelling of seagrass distribution in Moreton Bay, Australia, based on long-term citizen science data","authors":"E. Ovsyanikova , W.N. Venables , J.W. Udy","doi":"10.1016/j.ecss.2025.109611","DOIUrl":"10.1016/j.ecss.2025.109611","url":null,"abstract":"<div><div>Seagrasses are essential for coastal carbon sequestration and the survival of marine fauna worldwide. Regular seagrass monitoring is essential for coastal conservation as such areas are susceptible to rapid decline usually due to anthropogenic influence. We used long-term (2015–2021) supervised citizen science data collected in Moreton Bay (Quandamooka), Australia, to investigate temporal change over a seven-year period and developed a random forest seagrass distribution model, using depth, water quality, and other predictor variables. We used hierarchical clustering to define seagrass groupings, which resulted in five clusters, named after the dominant seagrass species: ‘OS’ (<em>Oceana serrulata</em>), ‘ZM’ (<em>Zostera muelleri</em>), ‘HS’ (<em>Halophila spinulosa</em>), ‘HO’ (<em>Halophila ovalis</em>), and ‘Sparse’, the cluster with little or no seagrass present. To investigate temporal change in seagrass meadows during our study period, we conducted a longitudinal analysis of overall seagrass cover and seagrass cluster dominance using areas that had a sufficient number of samples in at least three consecutive time periods.</div><div>The predictive model produced a probability map of seagrass occurrence in Moreton Bay, explaining 86.7 % of the variability. It highlighted areas of the bay that would suffer from continuing water quality decline. Longitudinal analysis showed a decrease in seagrass presence in shallow water areas, of several areas of the bay across the study period (2015–2021), and changes in seagrass community composition across the bay.</div><div>Our results demonstrate the effective use of citizen science-collected data and statistical modelling techniques to understand the spatial and temporal variability of seagrass communities.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"328 ","pages":"Article 109611"},"PeriodicalIF":2.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145579987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reproductive dynamics of Scoletoma laurentiana (Polychaeta: Lumbrineridae) in NW Spain: Temperature-driven seasonal trends 西班牙西北部laurentiana（多毛纲：蚓科）的繁殖动态：温度驱动的季节趋势

IF 2.6 3区地球科学 Q1 MARINE & FRESHWATER BIOLOGY

Estuarine Coastal and Shelf Science

Pub Date : 2026-01-01 Epub Date: 2025-11-19 DOI: 10.1016/j.ecss.2025.109612

D. Escobar-Ortega , L. Couceiro , A. Fernández-Piñeiro , P. Seoane , D. Fernández-Márquez , R. Muíño , N. Fernández

Understanding reproductive cycles is essential for the sustainable management of marine resources, particularly those of exploited yet understudied invertebrates such as the polychaete Scoletoma laurentiana, a key bait species in Galicia (NW Spain). This study provides the first detailed description of its reproductive cycle in temperate Atlantic waters, focusing on seasonal dynamics and environmental drivers. Monthly samples collected during 2021 and 2023 at three coastal sites were analyzed through image-based quantification of oocyte size in relation to seawater temperature and photoperiod. The results revealed synchronous oogenic development at the individual level but asynchronous at the population scale, indicating extended spawning periods. Oogenesis began in late autumn, peaked in spring, and ceased completely during summer. Overall mean oocyte diameter was 172.27 μm ± 22.52, with significant spatial and interannual differences indicating reproductive plasticity. A strong inverse correlation between seawater temperature and the proportion of ovigerous females confirmed temperature as the main driver of spawning initiation, whereas photoperiod showed no significant effect. These findings provide the first comprehensive evidence of temperature-mediated reproductive seasonality in S. laurentiana, offering critical baseline knowledge for the sustainable management of this species in the northeastern Atlantic. Furthermore, the results indicate that the species productivity may be subject to alteration in response to climate change.

了解生殖周期对于海洋资源的可持续管理至关重要，特别是对于那些被开发但研究不足的无脊椎动物，如加利西亚（西班牙西北部）的一种关键饵料物种——多毛鱼Scoletoma laurentiana。本研究首次详细描述了其在温带大西洋水域的繁殖周期，重点关注季节动态和环境驱动因素。通过基于图像的定量分析卵母细胞大小与海水温度和光周期的关系，分析了2021年和2023年在三个沿海站点采集的每月样本。结果表明，在个体水平上卵源发育同步，而在种群尺度上卵源发育不同步，表明产卵周期延长。卵发生开始于深秋，在春季达到顶峰，在夏季完全停止。总体平均卵母细胞直径为172.27 μm±22.52，具有显著的空间和年际差异，表明生殖可塑性。海水温度与卵生雌鱼比例呈显著负相关，表明温度是雌鱼产卵启动的主要驱动因素，而光周期对雌鱼产卵启动的影响不显著。这些发现首次提供了温度介导的劳伦提纳（S. laurentiana）繁殖季节性的综合证据，为大西洋东北部该物种的可持续管理提供了关键的基线知识。此外，研究结果表明，物种生产力可能会随着气候变化而发生变化。

{"title":"Reproductive dynamics of Scoletoma laurentiana (Polychaeta: Lumbrineridae) in NW Spain: Temperature-driven seasonal trends","authors":"D. Escobar-Ortega , L. Couceiro , A. Fernández-Piñeiro , P. Seoane , D. Fernández-Márquez , R. Muíño , N. Fernández","doi":"10.1016/j.ecss.2025.109612","DOIUrl":"10.1016/j.ecss.2025.109612","url":null,"abstract":"<div><div>Understanding reproductive cycles is essential for the sustainable management of marine resources, particularly those of exploited yet understudied invertebrates such as the polychaete <em>Scoletoma laurentiana</em>, a key bait species in Galicia (NW Spain). This study provides the first detailed description of its reproductive cycle in temperate Atlantic waters, focusing on seasonal dynamics and environmental drivers. Monthly samples collected during 2021 and 2023 at three coastal sites were analyzed through image-based quantification of oocyte size in relation to seawater temperature and photoperiod. The results revealed synchronous oogenic development at the individual level but asynchronous at the population scale, indicating extended spawning periods. Oogenesis began in late autumn, peaked in spring, and ceased completely during summer. Overall mean oocyte diameter was 172.27 μm ± 22.52, with significant spatial and interannual differences indicating reproductive plasticity. A strong inverse correlation between seawater temperature and the proportion of ovigerous females confirmed temperature as the main driver of spawning initiation, whereas photoperiod showed no significant effect. These findings provide the first comprehensive evidence of temperature-mediated reproductive seasonality in <em>S. laurentiana,</em> offering critical baseline knowledge for the sustainable management of this species in the northeastern Atlantic. Furthermore, the results indicate that the species productivity may be subject to alteration in response to climate change.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"328 ","pages":"Article 109612"},"PeriodicalIF":2.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145624716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

How vegetation of Aninga (Montrichardia linifera) shapes meiofauna and nematoda in an urban Amazonian estuary? 在亚马逊河口的城市中，阿尼加（Montrichardia linifera）的植被是如何塑造小型动物和线虫的？

IF 2.6 3区地球科学 Q1 MARINE & FRESHWATER BIOLOGY

Estuarine Coastal and Shelf Science

Pub Date : 2026-01-01 Epub Date: 2025-11-14 DOI: 10.1016/j.ecss.2025.109597

Ana Beatriz Moreira Ferreira-Ramos , Virág Venekey , Thuareag Monteiro Trindade dos Santos

This study compares, for the first time, the temporal variations in the structure of meiofauna community, with emphasis in nematodes, between areas with or without presence of the Aninga macrophyte (M. linifera) in an urban Amazonian estuary. For this purpose, monthly samplings were carried during one year, divided into four climatic periods (Transition 1, Dry, Transition 2 and Rainy), in areas with and without vegetation in the Guajará River estuary, North Brazil. The two environments showed a similar granulometric composition comparing periods, mainly composed by fine sediments. Organic matter showed similar values throughout periods, with the highest concentration during Transition 1 (T1). Meiofauna was represented by 12 groups, with Nematoda as the most abundant group during all study. Density showed highest values during T1, while richness was highest during the dry and T2 periods. Nematoda was composed by 89 genera belonging to 39 families, with Zygonemella as the most abundant genus, belonging to Xyalidae, the most abundant and richest family. The highest density and richness of genera occurred during the T2 period in the vegetated environment. Overall, this study showed that both meiofauna and nematodes were influenced by the seasonality of rainfall, the amount of nutrients available in the sediment and also by the presence of vegetation.

本研究首次比较了亚马逊河口地区有或没有大型植物（M. linifera）存在的地区，以线虫为重点的小型动物群落结构的时间变化。为此，在巴西北部瓜哈尔河口有植被和没有植被的地区，在一年的时间里每月进行采样，分为四个气候期（过渡1、干旱、过渡2和多雨）。两种环境的粒度组成相似，主要由细粒沉积物组成。有机质在各时期的含量基本一致，在过渡1 （T1）期间浓度最高。在所有研究中，以线虫为最丰富的类群。密度在T1期最高，丰富度在干燥期和T2期最高。线虫由39科89属组成，其中线虫属数量最多，属数最多，属数最多，属数最多。植被环境中植物密度和丰富度在T2期最高。总的来说，这项研究表明，小动物和线虫都受到降雨季节性、沉积物中可用营养物质数量以及植被存在的影响。

{"title":"How vegetation of Aninga (Montrichardia linifera) shapes meiofauna and nematoda in an urban Amazonian estuary?","authors":"Ana Beatriz Moreira Ferreira-Ramos , Virág Venekey , Thuareag Monteiro Trindade dos Santos","doi":"10.1016/j.ecss.2025.109597","DOIUrl":"10.1016/j.ecss.2025.109597","url":null,"abstract":"<div><div>This study compares, for the first time, the temporal variations in the structure of meiofauna community, with emphasis in nematodes, between areas with or without presence of the Aninga macrophyte (<em>M. linifera</em>) in an urban Amazonian estuary. For this purpose, monthly samplings were carried during one year, divided into four climatic periods (Transition 1, Dry, Transition 2 and Rainy), in areas with and without vegetation in the Guajará River estuary, North Brazil. The two environments showed a similar granulometric composition comparing periods, mainly composed by fine sediments. Organic matter showed similar values throughout periods, with the highest concentration during Transition 1 (T1). Meiofauna was represented by 12 groups, with Nematoda as the most abundant group during all study. Density showed highest values during T1, while richness was highest during the dry and T2 periods. Nematoda was composed by 89 genera belonging to 39 families, with <em>Zygonemella</em> as the most abundant genus, belonging to Xyalidae, the most abundant and richest family. The highest density and richness of genera occurred during the T2 period in the vegetated environment. Overall, this study showed that both meiofauna and nematodes were influenced by the seasonality of rainfall, the amount of nutrients available in the sediment and also by the presence of vegetation.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"328 ","pages":"Article 109597"},"PeriodicalIF":2.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145624792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reproductive biology of Trematomus hansoni (Nototheniidae) in the West Antarctic Peninsula reveals inshore spawning 南极半岛西部南极吸蝗科的繁殖生物学揭示了近岸产卵

IF 2.6 3区地球科学 Q1 MARINE & FRESHWATER BIOLOGY

Estuarine Coastal and Shelf Science

Pub Date : 2026-01-01 Epub Date: 2025-11-02 DOI: 10.1016/j.ecss.2025.109598

Manuel Novillo , Eugenia Moreira , Mario La Mesa , Gustavo Macchi , Esteban Barrera-Oro

Understanding the reproductive strategies of Antarctic notothenioids is essential for assessing their vulnerability to environmental change. This study provides evidence of inshore spawning in the striped notothen Trematomus hansoni off the West Antarctic Peninsula (WAP), based on macroscopic and histological analyses of gonads from specimens collected in Paradise Bay during austral summer 2019, 2023 and 2025. Gravid females display a group-synchronous ovarian development organization and a total spawning strategy, releasing large yolked oocytes (2.1–4.7 mm) in a single event during the spawning season. Post-ovulatory follicles and hydrated oocyte expulsion confirm that spawning occurs in late January–February in shallow coastal waters. The simultaneous presence of ripe males with mature spermatozoa indicates a synchronous reproductive period. The positive allometric growth observed in T. hansoni suggests a capital breeding strategy, consistent with ecological adaptations to the highly seasonal polar environment. Reproductive traits closely matched values from other Antarctic populations, although regional differences were observed in fecundity and gonadal investment. Our results align with documented evidence that several notothenioids species use nearshore habitats for reproduction. Given the WAP status as one of the fastest-warming regions on Earth, these findings highlight the ecological significance and vulnerability of inshore habitats. As temperature-driven changes may disrupt spawning timing and success, long-term monitoring of reproductive patterns is essential. The present study also underscores the need to consider inshore ecosystems in Antarctic fish population's conservation and management efforts.

了解南极notothenioids的生殖策略是至关重要的评估环境变化对它们的影响。本研究基于2019年、2023年和2025年南部夏季在天堂湾收集的标本的性腺宏观和组织学分析，为南极西部半岛（WAP）附近的条纹notothen Trematomus hansoni近海产卵提供了证据。妊娠雌鱼表现出群体同步卵巢发育组织和整体产卵策略，在产卵季节一次释放大的蛋黄卵母细胞（2.1-4.7 mm）。排卵后卵泡和水合卵母细胞排出证实产卵发生在1月下旬至2月的浅海沿岸水域。成熟的雄性和成熟的精子同时出现表明有一个同步的生殖期。观察到的正异速生长表明了一种资本繁殖策略，与对高度季节性的极地环境的生态适应一致。尽管在繁殖力和性腺投资方面存在区域差异，但生殖性状与其他南极种群的值密切匹配。我们的研究结果与文献证据一致，表明一些南极鱼物种使用近岸栖息地进行繁殖。考虑到WAP是地球上变暖最快的地区之一，这些发现突出了近海栖息地的生态重要性和脆弱性。由于温度驱动的变化可能会扰乱产卵时间和成功，因此对繁殖模式的长期监测至关重要。本研究还强调需要在南极鱼类种群的养护和管理工作中考虑近岸生态系统。

{"title":"Reproductive biology of Trematomus hansoni (Nototheniidae) in the West Antarctic Peninsula reveals inshore spawning","authors":"Manuel Novillo , Eugenia Moreira , Mario La Mesa , Gustavo Macchi , Esteban Barrera-Oro","doi":"10.1016/j.ecss.2025.109598","DOIUrl":"10.1016/j.ecss.2025.109598","url":null,"abstract":"<div><div>Understanding the reproductive strategies of Antarctic notothenioids is essential for assessing their vulnerability to environmental change. This study provides evidence of inshore spawning in the striped notothen <em>Trematomus hansoni</em> off the West Antarctic Peninsula (WAP), based on macroscopic and histological analyses of gonads from specimens collected in Paradise Bay during austral summer 2019, 2023 and 2025. Gravid females display a group-synchronous ovarian development organization and a total spawning strategy, releasing large yolked oocytes (2.1–4.7 mm) in a single event during the spawning season. Post-ovulatory follicles and hydrated oocyte expulsion confirm that spawning occurs in late January–February in shallow coastal waters. The simultaneous presence of ripe males with mature spermatozoa indicates a synchronous reproductive period. The positive allometric growth observed in <em>T. hansoni</em> suggests a capital breeding strategy, consistent with ecological adaptations to the highly seasonal polar environment. Reproductive traits closely matched values from other Antarctic populations, although regional differences were observed in fecundity and gonadal investment. Our results align with documented evidence that several notothenioids species use nearshore habitats for reproduction. Given the WAP status as one of the fastest-warming regions on Earth, these findings highlight the ecological significance and vulnerability of inshore habitats. As temperature-driven changes may disrupt spawning timing and success, long-term monitoring of reproductive patterns is essential. The present study also underscores the need to consider inshore ecosystems in Antarctic fish population's conservation and management efforts.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"328 ","pages":"Article 109598"},"PeriodicalIF":2.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145529339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0