Estuarine Coastal and Shelf Science最新文献_第10页

Seascape connectivity has low influence on seagrass blue carbon in tropical oligotrophic Islands 热带低营养岛屿海景连通性对海草蓝碳的影响较小

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

Estuarine Coastal and Shelf Science

Pub Date : 2025-10-17 DOI: 10.1016/j.ecss.2025.109587

Amrit Kumar Mishra , Syed Hilal Farooq

Seagrass meadows are important blue carbon sinks, yet significant knowledge gaps exist in understanding the role of seascape connectivity in influencing carbon (C) and nitrogen (N) stocks. This study addressed this existing knowledge gap, by quantifying the sediment and seagrass (Thalassia hemprichii) biomass C and N stocks, and utilized stable isotope non-connected modelling to assess the contribution of various sources to the sediment C pool in non-connected (with other seagrass) and connected (with mangroves) meadows in the Andaman and Nicobar Islands, India. We observed that non-connected meadows sediment contained 3.7-fold higher total N, and enriched δ¹³C and δ¹⁵N values compared to connected meadows. Contrastingly, the sediment in connected meadows exhibited higher organic matter, total C, and more depleted δ¹³C and δ¹⁵N. Surficial sediment C stocks (3.50 ± 1.78 Mg C ha⁻¹) were higher in connected meadows, while N stocks (1.21 ± 0.71 Mg N ha⁻¹) were higher in non-connected meadows. Higher N availability could be led to higher density and biomass N stocks in non-connected meadows. Stable isotope mixing modelling indicated that the average contribution of T. hemprichii biomass was highest (0.69 ± 0.13 %) to the sediment C pool, followed by other seagrass biomass in non-connected meadows. In connected meadows, the mean contribution of T. hemprichii biomass (0.68 ± 0.10 %) was also higher than mangrove C sources. This study highlights that the influence of seascape connectivity for cross habitat subsidies of C and organic matter is lower than connected seagrass meadows in intertidal oligotrophic island ecosystems of the Indian Ocean region.

海草草甸是重要的蓝碳汇，但在了解海景连通性对碳(C)和氮(N)储量的影响方面存在重大知识空白。本研究通过量化沉积物和海草（Thalassia hemprichii）的生物量C和N储量，并利用稳定同位素非连接模型来评估印度安达曼和尼科巴群岛非连接（与其他海草）和连接（与红树林）草甸中各种来源对沉积物C库的贡献，解决了这一现有知识空白。研究发现，与连通草甸相比，非连通草甸沉积物中总氮含量高3.7倍，δ13C和δ15N值富集。连片草甸沉积物有机质、总碳含量较高，δ13C和δ15N的耗竭程度较高。连通草甸表层沉积物C储量（3.50±1.78 Mg C ha−1）高于非连通草甸表层沉积物N储量（1.21±0.71 Mg N ha−1）。氮有效度越高，非连通草甸的密度和生物量氮储量越高。稳定同位素混合模型表明，在非连接草甸中，麻氏体对沉积物C库的平均生物量贡献最大（0.69±0.13%），其次是其他海草。在连片草甸中，麻氏滴虫生物量的平均贡献（0.68±0.10%）也高于红树林碳源。本研究强调，在印度洋地区潮间带寡营养岛屿生态系统中，海景连通性对碳和有机质跨生境补贴的影响低于连通的海草草甸。

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引用次数: 0

Decomposition of mangrove leaf litter with different quality and its effects on the organic carbon components and sources in sediments 不同质量红树林凋落叶的分解及其对沉积物中有机碳组分和来源的影响

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

Estuarine Coastal and Shelf Science

Pub Date : 2025-10-17 DOI: 10.1016/j.ecss.2025.109586

Jianxiang Feng , Lixia You , Long Wei , Yilai You , Zhengzheng Sun , Zhenxiong Yang

Litter decomposition is the process through which organic matter produced by mangroves is transferred to the sediment, with the stabilization of leaf litter carbon in sediment organic matter being crucial for mitigating climate change. This study analyzed the dynamics of carbon and nutrient release during litter decomposition through indoor ex situ controlled experiments and further traced the flow of litter carbon using carbon isotope labeling to quantify the proportion of litter carbon contributing to sediment carbon. Sediment organic carbon (SOC) content exhibited no significant change following short-term litter decomposition, indicating that respiration loss and water dissolution accompanied decomposition, and high-quality leaf litter input may balance sediment carbon loss. During short-term decomposition, 49.8 %–83.5 % of leaf litter carbon was decomposed, with 7.4 %–27.8 % of litter carbon fixed in sediment organic matter as mineral-associated organic carbon (MAOC), and 6.4 %–54.0 % as particulate organic carbon (POC), influenced by litter quality. High-quality leaf litter resulted in greater accumulation of both POC and MAOC, with higher MAOC transfer efficiency. Litter input promoted the production of ‘new carbon’ but did not significantly affect the total sediment MAOC, suggesting that new carbon formation may be accompanied by the loss of native carbon. The results provide important data on the key destinations of mangrove leaf litter carbon, highlight the importance of quantifying litter-derived carbon stabilization in mangrove sediments. Future research should prioritize quantifying lateral carbon exports (e.g., particulate and dissolved forms) and respiratory losses to fully understand mangrove blue carbon budgets.

凋落物分解是红树林产生的有机物向沉积物转移的过程，而稳定凋落物中沉积物有机质中的碳对减缓气候变化至关重要。本研究通过室内非原位控制实验分析凋落物分解过程中碳和养分释放的动态，并利用碳同位素标记进一步追踪凋落物碳的流动，量化凋落物碳对沉积物碳的贡献比例。短期凋落叶分解后沉积物有机碳（SOC）含量变化不显著，说明分解过程中伴随着呼吸损失和水分溶解，而优质凋落叶的输入可以平衡沉积物碳损失。在短期分解过程中，凋落叶碳被分解的比例为49.8% ~ 83.5%，其中7.4% ~ 27.8%的凋落叶碳以矿物伴生有机碳（MAOC）形式固定在沉积物有机质中，6.4% ~ 54.0%的凋落叶碳以颗粒有机碳（POC）形式固定在沉积物有机质中。高质量凋落叶对POC和MAOC的积累都有较大的影响，MAOC的转移效率也较高。凋落物输入促进了“新碳”的产生，但对沉积物总MAOC的影响不显著，表明新碳的形成可能伴随着原生碳的损失。研究结果为红树林凋落叶碳的主要目的地提供了重要数据，强调了红树林沉积物中凋落叶碳稳定量化的重要性。未来的研究应优先量化横向碳输出（如颗粒和溶解形式）和呼吸损失，以充分了解红树林蓝碳预算。

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引用次数: 0

Geomorphological control on mangrove height and factors arresting their development 地貌对红树林高度的控制及阻碍其发育的因素

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

Estuarine Coastal and Shelf Science

Pub Date : 2025-10-16 DOI: 10.1016/j.ecss.2025.109565

E.F. Asbridge , R. Lucas , C.D. Woodroffe , K. Rogers

Mangroves reach maximum height when substrate conditions are optimal for extended periods. A sudden change in canopy height along a shore normal profile can create a ‘wall-like’ feature, where tall forest is bounded by what is known as a ‘height discontinuity.’ Considering mangrove forests at a national scale, this study uses LiDAR-derived canopy height models to identify height discontinuities across Australia, the species responsible and potential causes. Notable height discontinuities were identified at the West Alligator, Leichhardt and Starcke Rivers and Port Douglas, where tall mangrove zones dominated by Rhizophora were located at the highest elevations of the intertidal slope and tree heights decreased sharply by ∼15 m at the landward margin. Shorter landward forests, dominated by Avicennia and Ceriops, were at the highest intertidal positions. This discontinuity marks a boundary in forest structure and a shift in substrate elevation and tidal inundation. Progradation occurred at some sites seaward of the tall forest suggesting ample lateral accommodation space. Analyses of normalized difference vegetation index (NDVI) across 36 years revealed highest NDVI in tall Rhizophora zones. Dead Rhizophora or sparse mangroves were observed at the landward margin of the height discontinuity. Our findings highlight that height discontinuities mark zones of maximum biomass storage, with transition to shorter trees, sparse forests and dieback zones likely due to sub-optimal conditions driven by sedimentation and tidal inundation patterns. These results underscore the complex interplay between species, sedimentation rates, long-phase tidal cycles and climatic events in influencing mangrove growth, dieback, and carbon sequestration.

当基质条件长时间处于最佳状态时，红树林的高度达到最大值。沿着海岸正常轮廓的树冠高度的突然变化可以创造出“墙状”的特征，在那里，高大的森林被所谓的“高度不连续”所包围。“考虑到全国范围内的红树林，这项研究使用激光雷达衍生的树冠高度模型来识别澳大利亚各地的高度不连续性，负责的物种和潜在原因。”在西鳄鱼河、Leichhardt河和Starcke河以及道格拉斯港发现了明显的高度不连续性，其中以根藻为主的高大红树林区位于潮间带斜坡的最高海拔，树木高度在向陆边缘急剧下降了约15 m。在潮间带的最高位置有较短的陆生森林，主要是Avicennia和ceriiops。这种不连续性标志着森林结构的边界以及基岩高程和潮汐淹没的变化。在高大森林向海的一些地点发生了递进，表明有充足的横向容纳空间。36年的归一化植被指数（NDVI）分析显示，高根霉带NDVI最高。在高度不连续的向陆缘处观察到枯死的根茎或稀疏的红树林。我们的研究结果强调，高度不连续标志着最大生物量储存区，由于沉积和潮汐淹没模式驱动的次优条件，可能会过渡到矮树，稀疏森林和枯死区。这些结果强调了物种、沉积速率、长阶段潮汐循环和气候事件之间复杂的相互作用，这些相互作用会影响红树林的生长、枯死和碳封存。

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引用次数: 0

Urbanization outweighs morphodynamics in shaping macrobenthic biodiversity on tropical island sandy beaches 城市化对热带岛屿沙滩大型底栖生物多样性的影响大于形态动力学

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

Estuarine Coastal and Shelf Science

Pub Date : 2025-10-15 DOI: 10.1016/j.ecss.2025.109581

Guilherme N. Corte , Kianna Pattengale

Ecological understanding of sandy beach ecosystems has advanced considerably in recent decades, with studies demonstrating the roles of morphodynamic factors (e.g., waves, sediment, slope) and anthropogenic activities in shaping biodiversity. Yet, knowledge gaps persist for tropical island beaches, ecosystems of disproportionate ecological, cultural, and economic importance but constrained by distinctive geomorphological and oceanographic conditions. We investigated how natural drivers and human disturbance interact to structure macrobenthic diversity across 16 beaches in the U.S. Virgin Islands (USVI), spanning a gradient from minimally disturbed to highly urbanized sites. Given the limited natural variability of local beaches, we hypothesized that morphodynamic characteristics would exert a minor influence compared to anthropogenic pressures, and that adjacent seagrass meadows would enhance macrobenthic richness and abundance on neighboring beaches through food subsidy. Our results support the first hypothesis: urbanization was the dominant predictor of macrobenthic biodiversity, with significant declines in both richness and abundance along the urbanization gradient, while morphodynamic effects were comparatively weak. Macrobenthic assemblages were dominated by annelids and arthropods, with urbanization effects most pronounced in submerged zones. Contrary to expectations, proximity to seagrass meadows was not significantly associated with higher richness or abundance, likely due to the influx of macroalgal wrack on local sandy beaches. These findings provide a critical baseline for conservation and management of tropical island sandy beaches and suggest that their limited morphodynamic variability diminishes its ecological role, while anthropogenic disturbance emerges as the primary driver of biodiversity patterns.

近几十年来，对沙滩生态系统的生态学理解取得了长足的进步，研究表明形态动力学因素（如波浪、沉积物、坡度）和人为活动在形成生物多样性方面的作用。然而，热带岛屿海滩的知识差距仍然存在，这些生态系统具有不成比例的生态、文化和经济重要性，但受到独特的地貌和海洋学条件的限制。本文研究了美属维尔京群岛（USVI） 16个海滩的大型底栖生物多样性结构的自然驱动力和人为干扰是如何相互作用的，这些海滩从受干扰最小到高度城市化。考虑到当地海滩有限的自然变异性，我们假设与人为压力相比，形态动力学特征的影响较小，邻近的海草草甸将通过食物补贴提高邻近海滩的大型底栖动物丰富度和丰度。研究结果支持第一个假设：城市化是大型底栖生物多样性的主要预测因子，其丰富度和丰度沿城市化梯度显著下降，而形态动力学效应相对较弱。大型底栖动物群落以环节动物和节肢动物为主，城市化效应在淹没区最为明显。与预期相反，靠近海草草甸与更高的丰富度或丰度没有显著关联，这可能是由于大型藻类残骸涌入当地的沙滩。这些发现为热带岛屿沙滩的保护和管理提供了关键的基线，并表明其有限的形态动力学变异性削弱了其生态作用，而人为干扰成为生物多样性模式的主要驱动因素。

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引用次数: 0

Ecosystem-level effects of filter-feeding bivalves enhancement in Bohai Bay: An ecopath modeling approach 渤海湾滤食性双壳类增强的生态系统效应：一种生态模型方法

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

Estuarine Coastal and Shelf Science

Pub Date : 2025-10-15 DOI: 10.1016/j.ecss.2025.109584

Xinye Zhao , Zhaohui Sun , Xiangping Xue , Jiangwei Zan , Xinjing Xu , Xia Liu , Gao Meng , Fei Si

Stock enhancement and release represent critical strategies for inshore habitat restoration and fishery resource recovery. To quantify their ecological effects, this study developed an Ecopath-based energy flow model using fishery resource and environmental survey data from background investigation and post-release monitoring in the Tangshan nearshore waters (2023–2024). The model was employed to assess the impacts of filter-feeding bivalves proliferation on trophic structure, energy flux, and overall ecosystem functioning. Results demonstrated that primary producer trophic levels (phytoplankton and detritus) remained stable, whereas those of mid- and high-trophic groups—such as Oratosquilla oratoria and gobies—increased, elevating the system's mean trophic level from 2.794 to 2.808. Filter-feeding bivalves biomass rose markedly to 237.123 t/km², boosting energy transfer efficiency from 7.55 % to 10.94 % and refining energy flow composition. Total system throughput increased from 20384.6 to 25657.6 t/(km²·a), accompanied by a rise in energy conversion efficiency from 7.75 % to 11.23 %. Finn's cycling index rose from 5.98 % to 12.83 %, while the mean path length of energy flow extended from 2.53 to 3.19. The total primary production to respiration (TPP/TR) ratio approached unity, reflecting improved material cycling and ecosystem maturity. Those results suggest that well-planned filter-feeding shellfish stock enhancement can significantly support resource recovery and enhance ecosystem stability, offering a robust quantitative foundation for nearshore ecological management and the sustainable development of fishery resources in Bohai Bay.

鱼类的增加和释放是近岸生境恢复和渔业资源恢复的重要策略。为了量化其生态效应，本研究利用2023-2024年唐山近岸水域渔业资源环境调查数据和放生后监测数据，建立了基于ecpath的能量流模型。采用该模型评估了滤食性双壳类繁殖对营养结构、能量通量和整体生态系统功能的影响。结果表明：初级生产者的营养水平（浮游植物和碎屑）保持稳定，而中高营养群体的营养水平（如Oratosquilla oratoria和gobi）增加，系统的平均营养水平从2.794提高到2.808。滤食双壳类生物量显著增加，达到237.123 t/km2，能量传递效率从7.55%提高到10.94%，能量流组成得到改善。系统总吞吐量从20384.6增加到25657.6 t/(km2·a)，能量转换效率从7.75%提高到11.23%。芬兰的骑行指数从5.98%上升到12.83%，能量流平均路径长度从2.53增加到3.19。总初级生产与呼吸（TPP/TR）之比趋于一致，反映了物质循环和生态系统成熟度的提高。这些结果表明，有计划地增加滤食性贝类种群可以显著地支持资源恢复和增强生态系统的稳定性，为渤海湾近岸生态管理和渔业资源的可持续发展提供坚实的定量基础。

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引用次数: 0

Mid-to late holocene paleoenvironmental evolution of the bottom water layer in the semi-enclosed Amvrakikos Gulf Amvrakikos海湾半封闭底水层中-晚全新世古环境演化

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

Estuarine Coastal and Shelf Science

Pub Date : 2025-10-14 DOI: 10.1016/j.ecss.2025.109583

Amalia Prandekou , Maria Geraga , Elisavet Dotsika , Spyros Sergiou , Dimitris Christodoulou , George Ferentinos , Constantin Koutsikopoulos , George Papatheodorou

The Amvrakikos Gulf, a semi-enclosed marine basin in western Greece, has undergone substantial environmental changes over the past 6000 years due to geomorphological evolution, climatic variability, and human influences. This study aims to reconstruct the paleoenvironmental evolution of the bottom water layer of the gulf during the Mid-to Late Holocene. To achieve this, two sediment cores from the western and eastern basins were analyzed using an interdisciplinary approach, including foraminiferal and geochemical proxies.

The cores comprise fine-grained sediments while the foraminifera fauna exhibited high abundances with low diversity, primarily dominated by species commonly associated with eutrophic seafloors throughout the examined period especially in the inner parts of the gulf. Furthermore, foraminifera and geochemical proxies indicate that the inner gulf (east basin) presents lower salinity and higher environmental stress than the west basin indicating higher influence of the rivers than the Ionian water intrusions.

The results delineate three distinct phases in the environmental evolution of the Amvrakikos Gulf. From 6 to 3.8ka BP, the gulf exhibited relative oligotrophic conditions with high salinity and frequent marine intrusions from the Ionian Sea, facilitating enhanced oxygenation in bottom waters. Between 3.8 and 2.5ka BP, increased humidity and higher riverine input led to reduced salinity and higher eutrophication, particularly in the eastern basin. At that time, foraminifera proxies indicated that a low-energy environment has begun to establish, marking the onset of the hypoxic environment that is observed today. From 2.5ka BP to the present, the gulf has experienced escalating environmental degradation, with a general trend toward reduced salinity and oxygen depletion with several anoxic events especially in the eastern basin accelerating in humid periods.

Amvrakikos海湾是希腊西部的一个半封闭海盆，在过去的6000年里，由于地貌演变、气候变化和人类的影响，经历了实质性的环境变化。本研究旨在重建全新世中晚期海湾底水层的古环境演化。为了实现这一目标，采用跨学科的方法分析了西部和东部盆地的两个沉积物岩心，包括有孔虫和地球化学指标。岩心由细粒沉积物组成，而有孔虫动物群表现出高丰度和低多样性，主要是与富营养化海底有关的物种，在整个研究期间，特别是在海湾内部。此外，有孔虫和地球化学指标表明，内湾（东部盆地）比西部盆地盐度更低，环境压力更大，表明河流的影响比伊奥尼亚水入侵的影响更大。研究结果描绘了阿姆拉基科斯湾环境演化的三个不同阶段。在6 ~ 3.8ka BP期间，该海湾呈现出高盐度和频繁来自爱奥尼亚海的海洋入侵的相对少营养条件，促进了底部水的氧合增强。在3.8 ~ 2.5ka BP之间，湿度增加和河流输入增加导致盐度降低和富营养化加剧，特别是在盆地东部。那时，有孔虫的代用物表明低能环境已经开始建立，标志着今天观察到的缺氧环境的开始。2.5ka BP至今，渤海湾环境退化不断加剧，总体呈盐度降低和缺氧的趋势，特别是盆地东部的缺氧事件在湿润期加速发生。

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引用次数: 0

Impact of large events on microplastic pollution on sandy beaches: a case study of Carnival in Rio de Janeiro, Brazil 大型活动对沙滩微塑料污染的影响：以巴西里约热内卢狂欢节为例

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

Estuarine Coastal and Shelf Science

Pub Date : 2025-10-14 DOI: 10.1016/j.ecss.2025.109582

G.I. Sodré , G. Martins , M.G. Lopes , R.R.S. Abude , M. Augusto , M.M. Cunha , C.W.C. Branco , S.G.M. Portugal , T.M.B. Cabrini

Large-scale public events can significantly influence coastal pollution, particularly through short-term increases of microplastics (MPs). This study assessed temporal and spatial variations in MP concentrations (fragments, fibers, and pellets) at Flamengo Beach, Rio de Janeiro, before, during, and after Carnival, with an additional control sampling eight months later. Results revealed sharp increases in all categories during Carnival, followed by stable post-event levels and subsequent reductions in the control period. Fragments constituted the dominant category (66.3 %), followed by fibers (26.2 %) and pellets (7.5 %). Within the fragment group, visually recognizable items, such as glitter, which is intensively used during Carnival festivities, were notable. No significant spatial variation was detected between mesolittoral and supralittoral zones, suggesting that intense human activities uniformly affect these areas. By linking mass recreational events with spatiotemporal patterns of MP accumulation, this study provides novel evidence of how urban festivities act as acute drivers of microplastic contamination in sandy beaches. These findings underscore the need for improved beach management practices and effective measures to mitigate single-use plastic pollutants and non-essential items, with glitter serving as a notable example due to its widespread use, high visibility, and increasing recognition in regulatory frameworks. These insights underscore the need to integrate pollution mitigation into sustainable event planning and coastal governance.

大型公共活动可以显著影响沿海污染，特别是通过微塑料（MPs）的短期增加。本研究评估了里约热内卢弗拉门戈海滩在狂欢节之前、期间和之后的MP浓度（碎片、纤维和颗粒）的时空变化，并在8个月后进行了额外的对照采样。结果显示，在狂欢节期间，所有类别都急剧增加，随后是稳定的活动后水平，随后在控制期间减少。碎片是主要类型（66.3%），其次是纤维（26.2%）和颗粒（7.5%）。在碎片组中，视觉上可识别的物品，如在狂欢节庆祝活动中大量使用的闪光，是值得注意的。中滨海和上滨海区域间没有明显的空间差异，表明强烈的人类活动对这些区域的影响是一致的。通过将大众娱乐活动与微塑料积累的时空模式联系起来，本研究为城市庆祝活动如何成为沙滩微塑料污染的急性驱动因素提供了新的证据。这些发现强调了改善海滩管理实践和有效措施的必要性，以减少一次性塑料污染物和非必需物品，闪光是一个值得注意的例子，因为它的广泛使用，高可见度，并在监管框架中得到越来越多的认可。这些见解强调了将污染缓解纳入可持续活动规划和沿海治理的必要性。

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引用次数: 0

Environmental influence on the phenology of Mustelus schmitti and seasonal availability for small-scale fisheries 环境对施米提木螺物候和小规模渔业季节可利用性的影响

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

Estuarine Coastal and Shelf Science

Pub Date : 2025-10-13 DOI: 10.1016/j.ecss.2025.109568

Andrés Javier Jaureguizar , Martina Daniela Camiolo , Sebastian Moriggia , Juan Manuel Molina , Andrés Conrado Milessi

This study investigates how environmental factors (temperature, chlorophyll, turbidity, wind, freshwater discharge) and time (month) influence life history stage availability of M. schmitti in a reproductive aggregation area, San Antonio Cape. Based on the landing of a gill net fishery, this research was conducted during 18 months covering two austral reproductive periods. A total of 13,633 individuals (TL 38–95 cm) were examined, and both sexes showed a multimodal length distribution with three main size assemblages (TL < 50 cm, 50–70 cm, TL > 72 cm) showing monthly occurrence differences, ocurring all size assemblages, two or just one. Both sexes showed higher densities from September to November (spring), albeit with strong differences between both spring periods, and lower densities during summer and winter. The MRT analysis showed that main size/sex-classes segregation was associated to shallow inshore vs. deeper waters (16.32 %), followed by turbidity (8.01 %, Kd490) within inshore waters and SST/freshwater discharge (∼13.96 °C/∼21,369 m3s-1, equal improve, 5.05 %) at the deeper waters; and the subsequent to SST values. The intra-annual environmental variation associated to size/sex-classes suggests that the occurrence of seasonal life cycle events could be explained by the species's size/sex-classes sensitivity to changes in the spatial extent of environmental conditions (i.e., temperature and freshwater discharge). The timing of these events appears to be driven more by environmental shifts than by other factors in this coastal habitat. Small-scale fishery landings offered a useful context to infer how environmental factors influence the timing of availability of different shark life stages.

本研究探讨了环境因子（温度、叶绿素、浊度、风、淡水流量）和时间（月）对圣安东尼奥角生殖聚集区施米蒂m.s hmitti生活史阶段有效性的影响。本研究以刺网渔场登陆为基础，历时18个月，涵盖两个南方繁殖期。共有13633只个体（全长38 ~ 95 cm）被检测，两性均呈现多模态长度分布，3个主要尺寸组合（全长50 cm、50 ~ 70 cm、全长72 cm）出现月差异，出现所有尺寸组合，两个或只有一个。两性在9 - 11月（春季）密度较高，但春季差异较大；夏、冬密度较低。MRT分析显示，主要的尺寸/性别类别分离与浅海近岸水域和深水水域（16.32%）有关，其次是近岸水域的浊度（8.01%,Kd490）和深水水域的SST/淡水排放量（~ 13.96°C/ ~ 21,369 m3 -1，同等改善，5.05%）；以及随后的海温值。与大小/性别分类相关的年内环境变化表明，季节性生命周期事件的发生可以用物种大小/性别分类对环境条件（即温度和淡水流量）空间范围变化的敏感性来解释。这些事件发生的时间似乎更多地受到环境变化的影响，而不是这个沿海栖息地的其他因素。小规模渔业登陆提供了一个有用的背景来推断环境因素如何影响不同鲨鱼生命阶段的可用时间。

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引用次数: 0

Trophic ecology of marine migratory fishes in Mediterranean coastal lagoons 地中海沿岸泻湖海洋洄游鱼类的营养生态学

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

Estuarine Coastal and Shelf Science

Pub Date : 2025-10-13 DOI: 10.1016/j.ecss.2025.109580

A. Marguin , T. Blasco , Q. Garemi , M. Montanes , F. Rossi

Fish trophic ecology may change among coastal lagoons because of their natural characteristics and the intensity and type of human activities, which can alter the eutrophication level. The diet, trophic niche and position of the Sparidae Sparus aurata and Diplodus sargus and of Mugilidae were investigated during their residence in 3 lagoons along the French Mediterranean coast. These lagoons differ in environmental characteristics and degrees of human activities. Analyses of bulk δ13C and δ15N were done on both fish muscle and bone collagen because these tissues have different turnover rates and inform of diet changes within a different time frame. For S. aurata we also analysed δ13C and δ15N of amino acids in bone collagen to further explore the origin of baseline food sources and the trophic position without an external baseline. In the least impacted of the 3 lagoons, fishes occupied a higher trophic position. Sparidae showed the most specialised diet and Mugilidae the most generalist one. Bone collagen showed, instead, no variation in trophic position or diet, likely because it integrates signals over fish growth and is more conservative than muscle. However, the similar δ¹⁵N patterns observed between tissues across the three lagoons indicate that eutrophication imprints both short- and long-term dietary signals, highlighting the potential of fish bone collagen as a proxy for reconstructing long-term eutrophication patterns in coastal lagoons.

海岸带泻湖的自然特性和人类活动的强度和类型会改变其富营养化程度，从而导致鱼类营养生态发生变化。调查了法国地中海沿岸3个泻湖中野sparidus Sparus aurata和Diplodus sargus以及Mugilidae的食性、营养生态位和生境。这些泻湖的环境特征和人类活动程度各不相同。对鱼肌肉和骨胶原的δ13C和δ15N进行了分析，因为这些组织具有不同的周转率，并在不同的时间框架内通知饮食变化。对于aurata，我们还分析了骨胶原中氨基酸的δ13C和δ15N，以进一步探索基线食物来源的来源和在没有外部基线的情况下的营养地位。在受影响最小的3个泻湖中，鱼类的营养地位较高。散文科表现出最特化的食性，Mugilidae表现出最通用性的食性。相反，骨胶原没有显示出营养位置或饮食的变化，可能是因为它整合了鱼类生长的信号，比肌肉更保守。然而，在三个泻湖的组织中观察到的相似的δ15N模式表明，富营养化在短期和长期的饮食信号中都有印记，这突出了鱼骨胶原蛋白作为重建沿海泻湖长期富营养化模式的代理的潜力。

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引用次数: 0

Summary reply to ‘Discussion: Tidal variation and flow dynamics in Indian Sundarban based on field observation and numerical models’ by Das et al. (2025). DOI: https://doi.org/10.1016/j.ecss.2025.109526’. 对Das et al.（2025）的“讨论：基于野外观测和数值模型的印度孙德班潮汐变化和流动动力学”的总结回复。DOI: https://doi.org/10.1016/j.ecss.2025.109526”。

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

Estuarine Coastal and Shelf Science

Pub Date : 2025-10-11 DOI: 10.1016/j.ecss.2025.109575

Swapan Paul , Chandan Surabhi Das , Subhamita Chaudhuri

This short communication provides a formal response to the discussion by Das et al. (2025) concerning Paul et al. (2024a), “Tidal variation and flow dynamics in the Indian Sundarban based on field observation and numerical models.” Several critiques arose from the abbreviated methodological descriptions in the original article, which were constrained by the journal's word limits. As such, the complete procedures for tide-pole construction, installation, and operation across seven tide monitoring stations are clarified, emphasizing robust, reproducible, and field-appropriate techniques. Clarification is provided on water-level adjustment, which was achieved through a MIKE 21-based model to ensure consistency with Mean Sea Level despite logistical constraints. Further clarification addresses misinterpretations related to temporal resolution, positional accuracy, and data integrity. The modelling framework—comprising tidal harmonic analysis, bathymetric setup, boundary conditions, and validation—was conducted in accordance with standard hydrodynamic practices and supported by relevant literature. Apparent anomalies identified by Das et al. (2025) are explained as a misunderstanding of methodological scope or data usage. Overall, this reply reinforces the transparency and scientific rigor of Paul et al. (2024a) and demonstrates that the findings remain methodologically sound, internally coherent, and consistent with accepted estuarine modelling standards.

这篇简短的通讯对Das et al.（2025）关于Paul et al. （2024a）“基于野外观测和数值模型的印度孙德班潮汐变化和流动动力学”的讨论提供了正式回应。由于期刊的字数限制，原文中对方法的描述被缩短了，这引起了一些批评。因此，阐明了七个潮汐监测站的潮汐极建设、安装和操作的完整程序，强调了稳健、可重复和适合现场的技术。澄清了水位调整，这是通过基于MIKE 21的模型实现的，以确保在后勤限制下与平均海平面保持一致。进一步的澄清解决了与时间分辨率、位置精度和数据完整性相关的误解。建模框架——包括潮汐谐波分析、水深设置、边界条件和验证——按照标准的水动力实践进行，并得到相关文献的支持。Das等人（2025）发现的明显异常被解释为对方法范围或数据使用的误解。总的来说，这一答复加强了Paul等人（2024a）的透明度和科学严谨性，并表明这些发现在方法上是合理的，内部连贯的，并且与公认的河口建模标准一致。

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引用次数: 0