Continental Shelf Research最新文献

Seawater flow attenuation by structurally complex kelp forests in a high-latitude fjord 高纬度峡湾结构复杂的海带森林对海水流动的衰减

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2026-01-13 DOI: 10.1016/j.csr.2026.105646

Klaudia Kosek , Wojciech Artichowicz , Piotr Balazy , Bernabé Moreno , Maciej Chelchowski , Piotr Kuklinski

Kelp forests are integral components of coastal marine ecosystems, significantly enhancing biodiversity, productivity and stability. With their large and complex canopy structures, which often occur in dense groups, they are able to physically modify their surroundings (e.g., flow velocity of currents, chemical composition of water), though the extent of this influence is not fully understood. The primary objective of this investigation was to examine the impact of kelp forests on seawater currents in the rapidly changing Arctic coastal ecosystem. The studied kelp forests along Isfjorden (Spitsbergen, 78° N) were predominantly composed of Alaria esculenta, Saccharina latissima and Laminaria digitata, with an average density of 58.9 ± 18.6 ind/m² and maximum length of individuals up to 206 cm (S. latissima). Through comprehensive analysis of currents velocity, direction and tidal patterns, significant reductions in flow velocities were observed within kelp forests compared to nearby kelp-free areas. Notably, at a depth of 7 m, mean flow speeds varied from 9.89 cm/s at locations with no kelp forest to 3.03 cm/s at locations with dense kelp forest, indicating distinct differences in flow dynamics. This study quantifies the impact of kelp forest composed of above-mentioned species on seawater currents, showing that aggregations of these morphologies generate microhabitats with distinct flow regimes. This knowledge is essential especially for the Arctic, enabling prediction of coastal ecosystem responses to rapid environmental changes and managing potential impacts on biodiversity and ecosystem functioning.

海带林是沿海海洋生态系统的组成部分，可显著提高生物多样性、生产力和稳定性。它们的树冠结构大而复杂，经常密集地聚集在一起，因此能够从物理上改变它们周围的环境（例如，水流的流速、水的化学成分），尽管这种影响的程度尚不完全清楚。这项调查的主要目的是研究在快速变化的北极沿海生态系统中，海带森林对洋流的影响。研究的Isfjorden （Spitsbergen, 78°N）海带林主要由褐藻（Alaria esculenta）、糖藻（Saccharina latissima）和海带（Laminaria digitata）组成，平均密度为58.9±18.6 ind/m2，最大个体长度可达206 cm。通过对水流速度、方向和潮汐模式的综合分析，发现与附近无海带地区相比，海带森林内的水流速度显著降低。值得注意的是，在7 m深度，平均流速从无海带林的9.89 cm/s到海带林茂密的3.03 cm/s不等，表明水流动力学存在明显差异。本研究量化了由上述物种组成的海带森林对海水流的影响，表明这些形态的聚集产生了具有不同流态的微生境。这方面的知识尤其对北极至关重要，可以预测沿海生态系统对快速环境变化的反应，并管理对生物多样性和生态系统功能的潜在影响。

{"title":"Seawater flow attenuation by structurally complex kelp forests in a high-latitude fjord","authors":"Klaudia Kosek , Wojciech Artichowicz , Piotr Balazy , Bernabé Moreno , Maciej Chelchowski , Piotr Kuklinski","doi":"10.1016/j.csr.2026.105646","DOIUrl":"10.1016/j.csr.2026.105646","url":null,"abstract":"<div><div>Kelp forests are integral components of coastal marine ecosystems, significantly enhancing biodiversity, productivity and stability. With their large and complex canopy structures, which often occur in dense groups, they are able to physically modify their surroundings (e.g., flow velocity of currents, chemical composition of water), though the extent of this influence is not fully understood. The primary objective of this investigation was to examine the impact of kelp forests on seawater currents in the rapidly changing Arctic coastal ecosystem. The studied kelp forests along Isfjorden (Spitsbergen, 78° N) were predominantly composed of <em>Alaria esculenta</em>, <em>Saccharina latissima</em> and <em>Laminaria digitata</em>, with an average density of 58.9 ± 18.6 ind/m<sup>2</sup> and maximum length of individuals up to 206 cm (<em>S. latissima</em>). Through comprehensive analysis of currents velocity, direction and tidal patterns, significant reductions in flow velocities were observed within kelp forests compared to nearby kelp-free areas. Notably, at a depth of 7 m, mean flow speeds varied from 9.89 cm/s at locations with no kelp forest to 3.03 cm/s at locations with dense kelp forest, indicating distinct differences in flow dynamics. This study quantifies the impact of kelp forest composed of above-mentioned species on seawater currents, showing that aggregations of these morphologies generate microhabitats with distinct flow regimes. This knowledge is essential especially for the Arctic, enabling prediction of coastal ecosystem responses to rapid environmental changes and managing potential impacts on biodiversity and ecosystem functioning.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"298 ","pages":"Article 105646"},"PeriodicalIF":2.2,"publicationDate":"2026-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146023415","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

High-resolution tidal harmonic reconstruction in the South China sea using ENOPF and a 2D adjoint tidal model 基于ENOPF和2D伴随潮汐模型的南海高分辨率潮汐调和重建

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2026-01-09 DOI: 10.1016/j.csr.2026.105645

Yibo Zhang , Xiaojiang Zhang , Kaijun Ren , Huizan Wang , Weimin Zhang , Xianqing Lv

Accurate reconstruction of tidal harmonic constants in complex marginal seas like the South China Sea (SCS) is critical for understanding regional tidal dynamics and improving coastal ocean forecasting. This study integrates the two-dimensional (2D) adjoint tidal model with the Equidistant Nodes Orthogonal Polynomial Fitting (ENOPF) method to reconstruct high-resolution gridded tidal harmonic constants for four tidal constituents—N₂, K₂, P₁, and Q₁—across the SCS. The study region is divided into five sub-areas, with ENOPF applied in the central basin and a combination of model assimilation and polynomial fitting used in coastal regions. To address discontinuities at subregional boundaries, four smoothing techniques—Savitzky-Golay filter, Gaussian filter, Bilateral filter, and linear distance weighting—are tested. Results show that the linear distance weighting provides the reasonable cotidal charts while maintaining data fidelity, which is selected for final implementation. The reconstructed results are validated against satellite altimetry (X-TRACK) and tide gauge observations, and benchmarked against six global tidal models, including TPXO10, FES2022, and EOT20, etc. Across all constituents, the reconstruction demonstrates superior or comparable accuracy in both amplitude and phase lag, particularly in coastal areas. This study provides an effective and scalable approach for high-precision tidal reconstruction in marginal seas, with implications for operational oceanography, coastal management, and regional climate studies.

准确重建南海等复杂边缘海的潮汐调和常数对了解区域潮汐动态和提高沿海海洋预报水平具有重要意义。本研究将二维伴随潮汐模型与等距节点正交多项式拟合（ENOPF）方法相结合，重建了南海4个潮汐组分（n2、K2、P1和q1）的高分辨率网格化潮汐调和常数。研究区分为5个分区，中部采用ENOPF，沿海采用模式同化与多项式拟合相结合的方法。为了解决分区域边界的不连续问题，测试了四种平滑技术——savitzky - golay滤波器、高斯滤波器、双边滤波器和线性距离加权。结果表明，线性距离加权在保证数据保真度的前提下，提供了合理的共潮图，为最终实现所选择。重建结果与卫星测高（X-TRACK）和验潮仪观测结果进行了验证，并以TPXO10、FES2022和EOT20等6个全球潮汐模型为基准进行了验证。在所有成分中，重建在振幅和相位滞后方面都表现出优越或相当的准确性，特别是在沿海地区。本研究为边缘海高精度潮汐重建提供了一种有效且可扩展的方法，对业务海洋学、海岸管理和区域气候研究具有重要意义。

{"title":"High-resolution tidal harmonic reconstruction in the South China sea using ENOPF and a 2D adjoint tidal model","authors":"Yibo Zhang , Xiaojiang Zhang , Kaijun Ren , Huizan Wang , Weimin Zhang , Xianqing Lv","doi":"10.1016/j.csr.2026.105645","DOIUrl":"10.1016/j.csr.2026.105645","url":null,"abstract":"<div><div>Accurate reconstruction of tidal harmonic constants in complex marginal seas like the South China Sea (SCS) is critical for understanding regional tidal dynamics and improving coastal ocean forecasting. This study integrates the two-dimensional (2D) adjoint tidal model with the Equidistant Nodes Orthogonal Polynomial Fitting (ENOPF) method to reconstruct high-resolution gridded tidal harmonic constants for four tidal constituents—N<sub>2</sub>, K<sub>2</sub>, P<sub>1</sub>, and Q<sub>1</sub>—across the SCS. The study region is divided into five sub-areas, with ENOPF applied in the central basin and a combination of model assimilation and polynomial fitting used in coastal regions. To address discontinuities at subregional boundaries, four smoothing techniques—Savitzky-Golay filter, Gaussian filter, Bilateral filter, and linear distance weighting—are tested. Results show that the linear distance weighting provides the reasonable cotidal charts while maintaining data fidelity, which is selected for final implementation. The reconstructed results are validated against satellite altimetry (X-TRACK) and tide gauge observations, and benchmarked against six global tidal models, including TPXO10, FES2022, and EOT20, etc. Across all constituents, the reconstruction demonstrates superior or comparable accuracy in both amplitude and phase lag, particularly in coastal areas. This study provides an effective and scalable approach for high-precision tidal reconstruction in marginal seas, with implications for operational oceanography, coastal management, and regional climate studies.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"298 ","pages":"Article 105645"},"PeriodicalIF":2.2,"publicationDate":"2026-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146023416","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

Response of high-resolution heavy metals records to human activities after considering the influence of early diagenesis in the East China Sea over the last 70 years 70年来考虑早期成岩作用影响的东海高分辨率重金属记录对人类活动的响应

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2026-01-02 DOI: 10.1016/j.csr.2026.105638

Xiaolin Ren , Dejiang Fan , Judong Mao , Peng Cheng , Xin Zhang , Xueshi Sun

The records of heavy metals in sediments have been widely used as an indicator for reconstructing human activities, whereas whether early diagenesis influenced the heavy metal records remained uncertain. This study was based on the collection of sediment core from the East China Sea to identify the influence of early diagenesis on heavy metals in sediments through a contrast of heavy metals in sediments (HM_sed) and porewater (HM_pw), to explore the response of the heavy metal records to human activities in the last hundred years. The results demonstrated that the physicochemical conditions (grain size, Eh, pH) of the core were relatively stable and that HM_pw were primarily influenced by the degradation of organic matter and the reduction of iron (Fe) and manganese (Mn) oxides. The comparison between HM_pw and HM_sed indicated that the exchange of heavy metals between sediments and porewater was insignificant to HM_sed. The linear regression of aluminum (Al) to heavy metals (zinc, arsenic, and lead) allowed for the quantitative distinction of the contributions of natural and anthropogenic sources. Since 1950, anthropogenic heavy metals have increased rapidly, with significant phased changes. They are closely related to the percentage of secondary industry value in GDP. This study demonstrates that early diagenesis has a negligible effect on HM_sed and the secondary industry percentage is a comprehensive indicator to reflect anthropogenic heavy metals’ release.

沉积物中重金属记录已被广泛用作重建人类活动的指标，但早期成岩作用是否影响重金属记录仍不确定。本研究以东海沉积物岩心采集为基础，通过对比沉积物中重金属（HMsed）和孔隙水（HMpw），确定早期成岩作用对沉积物中重金属的影响，探讨近百年来重金属记录对人类活动的响应。结果表明，岩心的理化条件（粒径、Eh、pH）相对稳定，HMpw主要受有机物降解和铁、锰氧化物还原的影响。HMpw与HMsed的比较表明，沉积物与孔隙水之间的重金属交换对HMsed影响不显著。铝（Al）对重金属（锌、砷和铅）的线性回归允许对自然和人为来源的贡献进行定量区分。自1950年以来，人为重金属快速增加，并有明显的阶段性变化。它们与第二产业产值占GDP的比重密切相关。研究表明，早期成岩作用对重金属释放的影响可以忽略不计，第二产业百分比是反映人为重金属释放的综合指标。

{"title":"Response of high-resolution heavy metals records to human activities after considering the influence of early diagenesis in the East China Sea over the last 70 years","authors":"Xiaolin Ren , Dejiang Fan , Judong Mao , Peng Cheng , Xin Zhang , Xueshi Sun","doi":"10.1016/j.csr.2026.105638","DOIUrl":"10.1016/j.csr.2026.105638","url":null,"abstract":"<div><div>The records of heavy metals in sediments have been widely used as an indicator for reconstructing human activities, whereas whether early diagenesis influenced the heavy metal records remained uncertain. This study was based on the collection of sediment core from the East China Sea to identify the influence of early diagenesis on heavy metals in sediments through a contrast of heavy metals in sediments (HM<sub>sed</sub>) and porewater (HM<sub>pw</sub>), to explore the response of the heavy metal records to human activities in the last hundred years. The results demonstrated that the physicochemical conditions (grain size, Eh, pH) of the core were relatively stable and that HM<sub>pw</sub> were primarily influenced by the degradation of organic matter and the reduction of iron (Fe) and manganese (Mn) oxides. The comparison between HM<sub>pw</sub> and HM<sub>sed</sub> indicated that the exchange of heavy metals between sediments and porewater was insignificant to HM<sub>sed</sub>. The linear regression of aluminum (Al) to heavy metals (zinc, arsenic, and lead) allowed for the quantitative distinction of the contributions of natural and anthropogenic sources. Since 1950, anthropogenic heavy metals have increased rapidly, with significant phased changes. They are closely related to the percentage of secondary industry value in GDP. This study demonstrates that early diagenesis has a negligible effect on HM<sub>sed</sub> and the secondary industry percentage is a comprehensive indicator to reflect anthropogenic heavy metals’ release.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"298 ","pages":"Article 105638"},"PeriodicalIF":2.2,"publicationDate":"2026-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145928052","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

Phytoplankton community structure and harmful species in a North African coastal lagoon: the case of Moulay Bousselham, (Moroccan Atlantic) 北非沿海泻湖浮游植物群落结构和有害物种：以摩洛哥大西洋Moulay Bousselham为例

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2026-01-02 DOI: 10.1016/j.csr.2025.105635

Asia Ben Haddouch , Karima Chaira , Mohammed Loutfi , Samir Benbrahim , Benlahcen Rijal-Leblad , Mohamed Laabir

Phytoplankton is a reliable bioindicator for assessing water quality in aquatic environments. Research on phytoplankton in African coastal ecosystems, remains limited especially concerning toxic phytoplankton species and the accumulation of their associated toxins in mollusks. The Moulay Bousselham Lagoon is one of Morocco's most significant wetlands and ecologically protected areas, designated under the Ramsar convention. Its strategic location, connected to the African Atlantic Ocean, supports a rich and diverse assemblage of flora and fauna. A phytoplankton survey conducted from March 2015 to March 2016 at five sampling sites within the lagoon revealed a dominance of diatoms, followed by dinoflagellates. Among the 49 taxa identified, 47 % of dinoflagellates and 7 % of diatoms were potentially harmful. Dinoflagellates were most abundant during the summer months (June and July 2015), particularly at the lagoon's mouth (the Passe), with species of the genus Scrippsiella being especially abundant. Their presence declined progressively from downstream (the Passe) to upstream areas (Lâacha). In contrast, diatoms dominated in winter and spring and included Chaetoceros, Coscinodiscus, Rhizosolenia, Pseudo-nitzschia, and Nitzschia. During summer and autumn, dinoflagellates such as Ceratium, Scrippsiella and Prorocentrum became more abundant. It seems that the observed succession between diatoms and dinoflagellates may be influenced by seasonal changes in physicochemical parameters and freshwater inputs considering the differences in downstream and upstream stations. Throughout the study period, analysis of marine biotoxins in shellfish collected from the lagoon revealed no contamination by amnesic or paralytic shellfish toxins. However, lipophilic shellfish toxins were detected on a single occasion in farmed mussels at the Palmier site. The seasonal dynamics and spatial distribution of potentially harmful phytoplankton in the Moulay Bousselham Lagoon highlight the need for integrated coastal management strategies in this lagoon, particularly in monitoring toxic species and mitigating risks related to shellfish contamination.

浮游植物是评价水生环境水质的可靠生物指标。对非洲沿海生态系统中浮游植物的研究仍然有限，特别是关于有毒浮游植物物种及其相关毒素在软体动物中的积累。穆莱布塞勒姆泻湖是摩洛哥最重要的湿地和生态保护区之一，是拉姆萨尔公约指定的。它的战略位置与非洲大西洋相连，支持着丰富多样的动植物群。2015年3月至2016年3月在泻湖内的五个采样点进行的浮游植物调查显示，硅藻占主导地位，其次是鞭毛藻。在鉴定的49个分类群中，47%的鞭毛藻和7%的硅藻具有潜在危害。鞭毛藻在夏季（2015年6月和7月）最为丰富，特别是在泻湖口（通道），其中斯克里普斯属的种类尤其丰富。它们的存在从下游（帕斯河）到上游（拉阿恰河）逐渐减少。冬季和春季以硅藻为主，包括毛藻、尾盘藻、根管藻、伪Nitzschia和Nitzschia。夏秋两季，甲藻属Ceratium、Scrippsiella、proocentrum等甲藻种类增多。考虑到上游和下游站点的差异，硅藻和鞭毛藻之间的演替可能受到理化参数和淡水输入的季节变化的影响。在整个研究期间，对从泻湖收集的贝类中的海洋生物毒素进行的分析显示，没有受到健忘或麻痹贝类毒素的污染。然而，在Palmier站点的养殖贻贝中仅检测到一次亲脂性贝类毒素。穆莱布塞勒姆泻湖中潜在有害浮游植物的季节性动态和空间分布突出表明，需要在该泻湖制定综合沿海管理战略，特别是在监测有毒物种和减轻贝类污染相关风险方面。

{"title":"Phytoplankton community structure and harmful species in a North African coastal lagoon: the case of Moulay Bousselham, (Moroccan Atlantic)","authors":"Asia Ben Haddouch , Karima Chaira , Mohammed Loutfi , Samir Benbrahim , Benlahcen Rijal-Leblad , Mohamed Laabir","doi":"10.1016/j.csr.2025.105635","DOIUrl":"10.1016/j.csr.2025.105635","url":null,"abstract":"<div><div>Phytoplankton is a reliable bioindicator for assessing water quality in aquatic environments. Research on phytoplankton in African coastal ecosystems, remains limited especially concerning toxic phytoplankton species and the accumulation of their associated toxins in mollusks. The Moulay Bousselham Lagoon is one of Morocco's most significant wetlands and ecologically protected areas, designated under the Ramsar convention. Its strategic location, connected to the African Atlantic Ocean, supports a rich and diverse assemblage of flora and fauna. A phytoplankton survey conducted from March 2015 to March 2016 at five sampling sites within the lagoon revealed a dominance of diatoms, followed by dinoflagellates. Among the 49 taxa identified, 47 % of dinoflagellates and 7 % of diatoms were potentially harmful. Dinoflagellates were most abundant during the summer months (June and July 2015), particularly at the lagoon's mouth (the Passe), with species of the genus <em>Scrippsiella</em> being especially abundant. Their presence declined progressively from downstream (the Passe) to upstream areas (Lâacha). In contrast, diatoms dominated in winter and spring and included <em>Chaetoceros</em>, <em>Coscinodiscus</em>, <em>Rhizosolenia</em>, <em>Pseudo-nitzschia</em>, and <em>Nitzschia</em>. During summer and autumn, dinoflagellates such as <em>Ceratium</em>, <em>Scrippsiella</em> and <em>Prorocentrum</em> became more abundant. It seems that the observed succession between diatoms and dinoflagellates may be influenced by seasonal changes in physicochemical parameters and freshwater inputs considering the differences in downstream and upstream stations. Throughout the study period, analysis of marine biotoxins in shellfish collected from the lagoon revealed no contamination by amnesic or paralytic shellfish toxins. However, lipophilic shellfish toxins were detected on a single occasion in farmed mussels at the Palmier site. The seasonal dynamics and spatial distribution of potentially harmful phytoplankton in the Moulay Bousselham Lagoon highlight the need for integrated coastal management strategies in this lagoon, particularly in monitoring toxic species and mitigating risks related to shellfish contamination.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"298 ","pages":"Article 105635"},"PeriodicalIF":2.2,"publicationDate":"2026-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145928154","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

Rates and pathways of organic matter remineralisation in different sedimentary environments of the Helgoland Mud Area, North Sea 北海Helgoland泥区不同沉积环境下有机质再矿化速率与途径

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2026-01-01 DOI: 10.1016/j.csr.2025.105632

Daniel Müller , Bo Liu , Moritz Holtappels , Walter Geibert , Susann Henkel , Sabine Kasten

Coastal and shelf-sea sediments are hotspots for organic carbon (OC) remineralisation and burial. Using high-resolution solid-phase and pore-water data and diagenetic modelling, we investigated and quantified early diagenetic processes within sediments of the Helgoland Mud Area, SE German Bight. This included assessing the effects of bottom trawling and dumping of harbour sediments on rates and pathways of OC remineralisation. Our results show that aerobic respiration is the most important pathway of OC remineralisation, followed by sulphate reduction. Surprisingly, we observed no effect of different depositional and geochemical environments on the relative contribution of the different pathways of OC remineralisation in large parts of the study area, despite the wide range of mud contents, sedimentation rates, benthic OC fluxes and average reactivities of the OC reaching the sediment-water interface. This observation indicates that either (1) the variations within these parameters do not significantly influence the relative contribution of aerobic and anaerobic processes, or (2) the differences in these parameters are too insignificant to affect the contribution of the pathways. Exceptions are intensive bottom trawling, resulting in a lower contribution of aerobic respiration, enhanced sulphate reduction and higher overall OC remineralisation, and dumping of harbour sediments showing 7 to 12 times lower OC contents compared to harbour sediments and hence low OC remineralisation rates. This indicates a significant impact of benthic and pelagic remineralisation and ultimately CO₂ formation during dredging and dumping of harbour sediments.

沿海和陆架海沉积物是有机碳再矿化和埋藏的热点。利用高分辨率固相和孔隙水数据以及成岩模拟，研究并量化了德国东南部Helgoland泥区沉积物中的早期成岩过程。这包括评估海底拖网捕捞和倾倒港口沉积物对OC再矿化速率和途径的影响。我们的研究结果表明，有氧呼吸是OC再矿化的最重要途径，其次是硫酸盐还原。令人惊讶的是，尽管沉积物含量、沉积速率、底栖OC通量和到达沉积物-水界面的OC的平均反应性差异很大，但在研究区域的大部分地区，不同的沉积和地球化学环境对OC再矿化不同途径的相对贡献没有影响。这一观察结果表明，要么(1)这些参数的变化不会显著影响好氧和厌氧过程的相对贡献，要么(2)这些参数的差异太微不足道，不会影响途径的贡献。例外情况是密集的海底拖网捕捞，导致有氧呼吸的贡献降低，硫酸盐还原增强，总体OC再矿化程度提高，港口沉积物的OC含量比港口沉积物低7至12倍，因此OC再矿化率低。这表明在疏浚和倾倒港口沉积物过程中，底栖生物和远洋再矿化以及最终形成的二氧化碳产生了重大影响。

{"title":"Rates and pathways of organic matter remineralisation in different sedimentary environments of the Helgoland Mud Area, North Sea","authors":"Daniel Müller , Bo Liu , Moritz Holtappels , Walter Geibert , Susann Henkel , Sabine Kasten","doi":"10.1016/j.csr.2025.105632","DOIUrl":"10.1016/j.csr.2025.105632","url":null,"abstract":"<div><div>Coastal and shelf-sea sediments are hotspots for organic carbon (OC) remineralisation and burial. Using high-resolution solid-phase and pore-water data and diagenetic modelling, we investigated and quantified early diagenetic processes within sediments of the Helgoland Mud Area, SE German Bight. This included assessing the effects of bottom trawling and dumping of harbour sediments on rates and pathways of OC remineralisation. Our results show that aerobic respiration is the most important pathway of OC remineralisation, followed by sulphate reduction. Surprisingly, we observed no effect of different depositional and geochemical environments on the relative contribution of the different pathways of OC remineralisation in large parts of the study area, despite the wide range of mud contents, sedimentation rates, benthic OC fluxes and average reactivities of the OC reaching the sediment-water interface. This observation indicates that either (1) the variations within these parameters do not significantly influence the relative contribution of aerobic and anaerobic processes, or (2) the differences in these parameters are too insignificant to affect the contribution of the pathways. Exceptions are intensive bottom trawling, resulting in a lower contribution of aerobic respiration, enhanced sulphate reduction and higher overall OC remineralisation, and dumping of harbour sediments showing 7 to 12 times lower OC contents compared to harbour sediments and hence low OC remineralisation rates. This indicates a significant impact of benthic and pelagic remineralisation and ultimately CO<sub>2</sub> formation during dredging and dumping of harbour sediments.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"298 ","pages":"Article 105632"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145928053","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

A taxonomic approach to discriminating the ecological quality status under salinity stress in marine ecosystems using protozoa 利用原生动物鉴别盐度胁迫下海洋生态系统生态质量状况的分类学方法

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-12-31 DOI: 10.1016/j.csr.2025.105636

Qiaoling Wang, Awais Ali, Henglong Xu

Due to special statistical property, taxonomic distinctness has proved to be a powerful tool for discriminating ecological quality status. This article combines the taxonomic difference index with protozoa. To evaluate effects of salinity stress on ecological quality of marine ecosystems, periphytic protozoa, as test organisms, were exposed to a salinity gradient of 9, 19, 29 (control), 39 and 49 in temperature-controlled circulation systems (TCCSs) during 21 days. The changes of taxonomic distinctness measures of the test protozoa were detected along the salinity gradient. The taxonomic hierarchy of the test protozoa was significantly shifted with salinity changes compared to the control (29). The average taxonomic distinctness (Δ⁺) and variation in taxonomic distinctness (Λ⁺) were significantly dropped under salinity altering by 20. It suggests that the taxonomic distinctness of protozoa may serve as a robust bioindicator for evaluating the ecological quality of marine ecosystems under global salinity stress.

由于其特殊的统计性质，分类独特性已被证明是鉴别生态质量状况的有力工具。本文将分类差异指数与原生动物相结合。为评价盐度胁迫对海洋生态系统生态质量的影响，在温度控制循环系统（TCCSs）中，以21 d的盐度梯度分别为9、19、29（对照）、39和49的试验生物为实验对象，研究了盐度胁迫对海洋生态系统生态质量的影响。检测了试验原生动物在不同盐度梯度下的分类区别度变化。与对照相比，受试原生动物的分类等级随着盐度的变化而发生显著变化（29）。盐度变化20时，平均分类明显度（Δ+）和分类明显度变异（Λ+）显著下降。这表明原生动物的分类差异性可作为评价全球盐度胁迫下海洋生态系统生态质量的有力生物指标。

引用次数: 0

Assessing spatiotemporal changes in the benthic habitats of the West Gironde Mud Patch through the analyses of surface sediments, benthic macrofauna and sediment profile images 通过表层沉积物、大型底栖动物和沉积物剖面图像分析，评估西吉伦特泥滩底栖生物栖息地的时空变化

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-12-31 DOI: 10.1016/j.csr.2025.105637

Bastien Lamarque , Bruno Deflandre , Sabine Schmidt , Nicolas Lavesque , Guillaume Bernard , Frédéric Garabetian , Christophe Fontanier , Sylvain Rigaud , Florent Grasso , Mélanie Diaz , Aldo Sottolichio , Dominique Poirier , Martin Danilo , Alicia Romero-Ramirez , Antoine Grémare

This work aims to refine the current assessment of spatiotemporal changes in the benthic habitats of the West Gironde Mud Patch. It follows a survey based on the analysis of surface sediment characteristics and benthic macrofauna composition at 5 stations located along a depth gradient, which was achieved between 2010 and 2018. The present work extends this observation period to 2021 and includes the indirect assessment of bioturbation through the analysis of sediment profile image characteristics. Temporal changes in surface sediment characteristics were essentially seasonal with strong increases in chloropigment concentrations in spring. Temporal changes in benthic macrofauna composition were mostly interannual with a major difference between 2010 and 2016–2021 currently attributed to the impact of a major physical disturbance during 2013–2014. In this study, extending the observation period shows that full recovery of benthic macrofauna composition had not yet been achieved by 2021. Sediment profile image characteristics (tube and organisms numbers, area of subsurface structures, oxic void depth and aRPD thickness) showed: (i) clear seasonal changes at the two deepest stations, mostly associated with a spring increase in tube numbers; and (ii) no significant difference between 2010 and 2016–2021, except at the deepest station. The discrepancy between benthic macrofauna composition and sediment profile image characteristics may result from differences in the recovery dynamics of benthic macrofauna composition and functionalities. Overall, results clearly call for a further extension of the WGMP observation period, which could consist in a yearly sampling at only two stations.

本研究旨在完善目前对西吉伦特泥沼底栖生物栖息地时空变化的评估。该研究是在2010年至2018年期间进行的一项调查基础上进行的，该调查基于对沿深度梯度分布的5个站点的地表沉积物特征和底栖大型动物组成的分析。目前的工作将这一观察期延长至2021年，并包括通过分析沉积物剖面图像特征来间接评估生物扰动。表层沉积物特征的时间变化基本上是季节性的，春季叶绿素浓度明显增加。底栖大型动物组成的时间变化主要是年际变化，2010年至2016-2021年之间的主要差异目前归因于2013-2014年主要物理干扰的影响。在本研究中，延长观察期表明，到2021年底栖大型动物组成尚未完全恢复。沉积物剖面图像特征（管和生物数量、地下结构面积、氧空洞深度和aRPD厚度）显示：(1)两个最深站的季节变化明显，主要与管数量的春季增加有关；（ii）除最深站外，2010年与2016-2021年无显著差异。底栖动物组成和沉积物剖面图像特征的差异可能是由于底栖动物组成和功能恢复动态的差异。总体而言，结果明确要求进一步延长WGMP观察期，可能包括每年只在两个站点采样。

{"title":"Assessing spatiotemporal changes in the benthic habitats of the West Gironde Mud Patch through the analyses of surface sediments, benthic macrofauna and sediment profile images","authors":"Bastien Lamarque , Bruno Deflandre , Sabine Schmidt , Nicolas Lavesque , Guillaume Bernard , Frédéric Garabetian , Christophe Fontanier , Sylvain Rigaud , Florent Grasso , Mélanie Diaz , Aldo Sottolichio , Dominique Poirier , Martin Danilo , Alicia Romero-Ramirez , Antoine Grémare","doi":"10.1016/j.csr.2025.105637","DOIUrl":"10.1016/j.csr.2025.105637","url":null,"abstract":"<div><div>This work aims to refine the current assessment of spatiotemporal changes in the benthic habitats of the West Gironde Mud Patch. It follows a survey based on the analysis of surface sediment characteristics and benthic macrofauna composition at 5 stations located along a depth gradient, which was achieved between 2010 and 2018. The present work extends this observation period to 2021 and includes the indirect assessment of bioturbation through the analysis of sediment profile image characteristics. Temporal changes in surface sediment characteristics were essentially seasonal with strong increases in chloropigment concentrations in spring. Temporal changes in benthic macrofauna composition were mostly interannual with a major difference between 2010 and 2016–2021 currently attributed to the impact of a major physical disturbance during 2013–2014. In this study, extending the observation period shows that full recovery of benthic macrofauna composition had not yet been achieved by 2021. Sediment profile image characteristics (tube and organisms numbers, area of subsurface structures, oxic void depth and aRPD thickness) showed: (i) clear seasonal changes at the two deepest stations, mostly associated with a spring increase in tube numbers; and (ii) no significant difference between 2010 and 2016–2021, except at the deepest station. The discrepancy between benthic macrofauna composition and sediment profile image characteristics may result from differences in the recovery dynamics of benthic macrofauna composition and functionalities. Overall, results clearly call for a further extension of the WGMP observation period, which could consist in a yearly sampling at only two stations.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"298 ","pages":"Article 105637"},"PeriodicalIF":2.2,"publicationDate":"2025-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145928153","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

Distribution, aggregation and feeding habit promote coexistence among four sympatric species of stomatopods living in tropical mud substrates 热带泥质基质中四种同域口足类动物的分布、聚集和摄食习性促进了它们的共存

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-12-30 DOI: 10.1016/j.csr.2025.105634

Ying Pei Ng , Ving Ching Chong , Peter K.L. Ng

Burrowing stomatopods or mantis shrimps, that live on subtidal soft substrates are poorly studied in mangrove-mudflat ecosystems, as in Matang (Malaysia), a major feeding and nursery area for penaeid shrimps and fishes. Since stomatopods are known to be variably predacious, sedentary, territorial, and sometimes gregarious, it is of interest to study how sympatric species live and coexist in such substrates, including their trophic requirements. Bottom trawl samplings in Matang waters over 18 months revealed four species of squillid stomatopods: Clorodopsis scorpio in estuaries, Miyakella nepa and Oratosquillina perpensa in inshore waters, and Harpiosquilla raphidea in offshore waters. Their consistent size ranges and means across nearshore and offshore habitats showed no clear indication of ontogenetic migration. All species display contagious distributions with higher intraspecific than interspecific aggregation, fulfilling the coexistence criterion. Relative prey taxa consumptions are quite similar among conspecifics but vary among heterospecifics. Penaeid shrimp is the main prey for all species except H. raphidea. It is an abundant resource that acts as a hedge against possible prey shortage, allowing prey specialization in H. raphidea (fish feeder), plausibly in C. scorpio (shrimp feeder), and alternative prey choices for M. nepa and O. perpensa (shelled mollusc and crab feeders). The study's findings, despite the methodological constraints, have important implications for fishery management and habitat conservation in that stomatopods and penaeid shrimps are commercially exploited, the former depend on the latter as food, and the latter depend on coastal mangroves and mudflats as nursery areas.

生活在潮下软基质上的穴居口足类或螳螂虾在红树林-泥滩生态系统中很少被研究，如在马唐（马来西亚），一个对虾和鱼类的主要喂养和育苗区。由于已知口足类动物具有多种捕食性、定居性、领地性和有时群居性，因此研究同域物种如何在这些基质中生存和共存，包括它们的营养需求，是很有意义的。在马塘水域18个月的底拖网取样中发现4种鱿鱼口足类，分别是河口的天蝎座鱿鱼，近岸的Miyakella nepa和Oratosquillina perpensa，近海的Harpiosquilla raphidea。它们在近岸和近海栖息地的一致的大小范围和平均值表明没有明确的个体发生迁移迹象。所有种均表现出种内聚集性高于种间聚集性的传染分布，满足共存标准。同种种的相对食用量相似，异种种的相对食用量不同。对虾是除拉氏对虾外所有虾种的主要猎物。这是一种丰富的资源，可以防止可能出现的猎物短缺，允许H. raphidea（鱼类捕食者）的猎物专业化，C. scorpio（虾捕食者）的猎物专业化，以及M. nepa和O. perpensa（有壳软体动物和螃蟹捕食者）的猎物选择。这项研究的结果，尽管有方法上的限制，对渔业管理和生境保护具有重要意义，因为口足类和对虾被商业开发，前者依赖后者作为食物，后者依赖沿海红树林和泥滩作为苗圃。

{"title":"Distribution, aggregation and feeding habit promote coexistence among four sympatric species of stomatopods living in tropical mud substrates","authors":"Ying Pei Ng , Ving Ching Chong , Peter K.L. Ng","doi":"10.1016/j.csr.2025.105634","DOIUrl":"10.1016/j.csr.2025.105634","url":null,"abstract":"<div><div>Burrowing stomatopods or mantis shrimps, that live on subtidal soft substrates are poorly studied in mangrove-mudflat ecosystems, as in Matang (Malaysia), a major feeding and nursery area for penaeid shrimps and fishes. Since stomatopods are known to be variably predacious, sedentary, territorial, and sometimes gregarious, it is of interest to study how sympatric species live and coexist in such substrates, including their trophic requirements. Bottom trawl samplings in Matang waters over 18 months revealed four species of squillid stomatopods: <em>Clorodopsis scorpio</em> in estuaries, <em>Miyakella nepa</em> and <em>Oratosquillina perpensa</em> in inshore waters, and <em>Harpiosquilla raphidea</em> in offshore waters. Their consistent size ranges and means across nearshore and offshore habitats showed no clear indication of ontogenetic migration. All species display contagious distributions with higher intraspecific than interspecific aggregation, fulfilling the coexistence criterion. Relative prey taxa consumptions are quite similar among conspecifics but vary among heterospecifics. Penaeid shrimp is the main prey for all species except <em>H. raphidea</em>. It is an abundant resource that acts as a hedge against possible prey shortage, allowing prey specialization in <em>H. raphidea</em> (fish feeder), plausibly in <em>C. scorpio</em> (shrimp feeder), and alternative prey choices for <em>M. nepa</em> and <em>O. perpensa</em> (shelled mollusc and crab feeders). The study's findings, despite the methodological constraints, have important implications for fishery management and habitat conservation in that stomatopods and penaeid shrimps are commercially exploited, the former depend on the latter as food, and the latter depend on coastal mangroves and mudflats as nursery areas.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"298 ","pages":"Article 105634"},"PeriodicalIF":2.2,"publicationDate":"2025-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145928152","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

Spring-summer temporal dynamics of the zooplankton community in a flooded inlet of a sub-Antarctic river (Tierra del Fuego National Park) 亚南极河流淹没入口浮游动物群落的春夏时间动态（火地岛国家公园）

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-12-25 DOI: 10.1016/j.csr.2025.105633

Canela Chaparro-Godoy , Clara M. Iachetti , Soledad L. Diodato , Sarah L. Friesen , Daniel O. Bruno

Understanding the dynamics of zooplankton communities is essential given their key role in aquatic food webs and their value as indicators of ecosystem health. This study examined the temporal variation of micro- and mesozooplankton communities in a flooded estuarine area influenced by glacial meltwater, during the spring-summer period, considering both temporal and diel scales. Physical, chemical, biological, and meteorological parameters were measured, and their relationships with zooplankton composition were analysed. Three microzooplankton and fourteen mesozooplankton taxa were identified. The dominant groups were copepod nauplii and adults and the cladoceran Podon leuckarti. Zooplankton composition varied among periods and between daytime and nighttime, with Podon leuckarti and Oithona similis contributing most to diel differences. Zooplankton composition was influenced by water temperature, salinity, microphytoplankton biomass, wind intensity, and time of day, with seasonal effects explaining the largest share of variability. Our results provide insights into zooplankton dynamics in a sub-Antarctic estuarine ecosystem across two temporal scales. We propose a possible mechanism in which zooplankton are transported into this shallow floodplain mainly by tidal advection and subsequently benefit from the favourable environmental conditions present during the season of highest diversity (spring-summer). This area may also function as an important feeding habitat for other aquatic organisms.

考虑到浮游动物群落在水生食物网中的关键作用及其作为生态系统健康指标的价值，了解浮游动物群落的动态是至关重要的。本研究考察了受冰川融水影响的洪水河口地区在春夏期的微浮游动物和中浮游动物群落的时间变化，考虑了时间和昼夜尺度。测量了物理、化学、生物和气象参数，并分析了它们与浮游动物组成的关系。鉴定出3个微型浮游动物群和14个中浮游动物群。优势类群为桡足类鹦鹉螺和成虫，支大洋类鹦鹉螺。浮游动物的组成在不同的时期和白天和夜间都有变化，其中对浮游动物的差异贡献最大的是白鳍波顿（Podon leuckarti）和伊索纳（Oithona similis）。浮游动物组成受水温、盐度、微小浮游植物生物量、风强度和时间的影响，其中季节性影响最大。我们的研究结果提供了跨两个时间尺度的亚南极河口生态系统浮游动物动力学的见解。我们提出了一种可能的机制，即浮游动物主要通过潮汐平流进入浅水泛滥平原，并随后受益于多样性最高的季节（春夏）存在的有利环境条件。该地区也可能是其他水生生物的重要觅食栖息地。

{"title":"Spring-summer temporal dynamics of the zooplankton community in a flooded inlet of a sub-Antarctic river (Tierra del Fuego National Park)","authors":"Canela Chaparro-Godoy , Clara M. Iachetti , Soledad L. Diodato , Sarah L. Friesen , Daniel O. Bruno","doi":"10.1016/j.csr.2025.105633","DOIUrl":"10.1016/j.csr.2025.105633","url":null,"abstract":"<div><div>Understanding the dynamics of zooplankton communities is essential given their key role in aquatic food webs and their value as indicators of ecosystem health. This study examined the temporal variation of micro- and mesozooplankton communities in a flooded estuarine area influenced by glacial meltwater, during the spring-summer period, considering both temporal and diel scales. Physical, chemical, biological, and meteorological parameters were measured, and their relationships with zooplankton composition were analysed. Three microzooplankton and fourteen mesozooplankton taxa were identified. The dominant groups were copepod nauplii and adults and the cladoceran <em>Podon leuckarti</em>. Zooplankton composition varied among periods and between daytime and nighttime, with <em>Podon leuckarti</em> and <em>Oithona similis</em> contributing most to diel differences. Zooplankton composition was influenced by water temperature, salinity, microphytoplankton biomass, wind intensity, and time of day, with seasonal effects explaining the largest share of variability. Our results provide insights into zooplankton dynamics in a sub-Antarctic estuarine ecosystem across two temporal scales. We propose a possible mechanism in which zooplankton are transported into this shallow floodplain mainly by tidal advection and subsequently benefit from the favourable environmental conditions present during the season of highest diversity (spring-summer). This area may also function as an important feeding habitat for other aquatic organisms.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"297 ","pages":"Article 105633"},"PeriodicalIF":2.2,"publicationDate":"2025-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145840262","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

Interplay of habitat heterogeneity and sampling gear in structuring nekton communities: Insights from niche overlap and biomass spectra in a mangrove estuary 生境异质性和采样装置在构建浮游生物群落中的相互作用：来自红树林河口生态位重叠和生物量光谱的见解

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-12-24 DOI: 10.1016/j.csr.2025.105629

Yuming Wang , Xinyi Gao , Jiakang Liu , Yutong Ma , Miaozhi Lin , Tuohui Ye , Jianxiang Feng

To obtain the relationship between mangrove habitats and fisheries production, a seasonal investigation of the status of nekton communities in the Zhangjiang estuary was conducted using gillnet and unbaited centipede cage from September 2020 to May 2021. The index of relative importance (IRI), Shannon-Wiener diversity index (H′), Pielou evenness index (J’), and Margalef richness index (D) were used to study the dominant species and species diversity of the nekton community. A total of 83 species of nektons were identified in the survey, including 55 species of fish belonging to 11 orders and 22 families, mainly warm-water demersal fishes, accounting for 66.27 % of the total species, and 28 species of crustaceans belonging to 2 orders and 9 families, accounting for 33.73 % of the total species. The results of the NMDS analysis revealed that catches varied seasonally, that the BPUE of catches per unit effort in autumn was significantly higher than in other seasons. The spatial niche overlaps of nekton were generally high and seasonal variations in the biomass size spectra were noticeable. The species pairs with niche overlap over 0.3 (Qik>0.3) caught by gill nets and cages represented 73.3 % and 86.81 % of the total pairs, respectively. In general, the resources of nektons in Zhangjiang Estuary were relatively low, and the spatial distribution was uniform. The season was the main factor affecting the resources and community structure of nektons.

为了解红树林生境与渔业生产的关系，于2020年9月至2021年5月，采用刺网和无饵蜈蚣笼对张江口红树林浮游生物群落进行了季节性调查。采用相对重要性指数（IRI）、Shannon-Wiener多样性指数（H’）、Pielou均匀度指数（J’）和Margalef丰富度指数(D)研究了浮游生物群落的优势种和物种多样性。调查共发现浮游动物83种，其中鱼类55种，隶属于11目22科，以温水底栖鱼类为主，占总种数的66.27%；甲壳类28种，隶属于2目9科，占总种数的33.73%。NMDS分析结果显示，渔获量存在季节差异，秋季单位努力渔获量的BPUE显著高于其他季节。浮游生物的空间生态位重叠度普遍较高，生物量大小谱的季节变化明显。刺网和网箱捕获的生态位重叠度大于0.3 （Qik>0.3）的种对分别占73.3%和86.81%。总体而言，张江口内浮游生物资源相对较少，空间分布较为均匀。季节是影响线虫资源和群落结构的主要因素。

{"title":"Interplay of habitat heterogeneity and sampling gear in structuring nekton communities: Insights from niche overlap and biomass spectra in a mangrove estuary","authors":"Yuming Wang , Xinyi Gao , Jiakang Liu , Yutong Ma , Miaozhi Lin , Tuohui Ye , Jianxiang Feng","doi":"10.1016/j.csr.2025.105629","DOIUrl":"10.1016/j.csr.2025.105629","url":null,"abstract":"<div><div>To obtain the relationship between mangrove habitats and fisheries production, a seasonal investigation of the status of nekton communities in the Zhangjiang estuary was conducted using gillnet and unbaited centipede cage from September 2020 to May 2021. The index of relative importance (IRI), Shannon-Wiener diversity index (H′), Pielou evenness index (J’), and Margalef richness index (D) were used to study the dominant species and species diversity of the nekton community. A total of 83 species of nektons were identified in the survey, including 55 species of fish belonging to 11 orders and 22 families, mainly warm-water demersal fishes, accounting for 66.27 % of the total species, and 28 species of crustaceans belonging to 2 orders and 9 families, accounting for 33.73 % of the total species. The results of the NMDS analysis revealed that catches varied seasonally, that the BPUE of catches per unit effort in autumn was significantly higher than in other seasons. The spatial niche overlaps of nekton were generally high and seasonal variations in the biomass size spectra were noticeable. The species pairs with niche overlap over 0.3 (Qik>0.3) caught by gill nets and cages represented 73.3 % and 86.81 % of the total pairs, respectively. In general, the resources of nektons in Zhangjiang Estuary were relatively low, and the spatial distribution was uniform. The season was the main factor affecting the resources and community structure of nektons.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"297 ","pages":"Article 105629"},"PeriodicalIF":2.2,"publicationDate":"2025-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145840265","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