Continental Shelf Research最新文献_第10页

Tidal and wind-driven spatiotemporal variability in the residual displacement and dispersion of Lagrangian particles in a system of intertidal basins 潮间带盆地系统中拉格朗日粒子残余位移和弥散的潮汐和风力驱动时空变异性

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-11-01 DOI: 10.1016/j.csr.2025.105602

Jeancarlo M. Fajardo-Urbina , Ulf Gräwe , Herman J.H. Clercx , Theo Gerkema , Matias Duran-Matute

This study identifies and quantifies the distinct contributions of wind and tides to the variability of Lagrangian residual transport in the Dutch Wadden Sea (DWS), a mesotidal system of interconnected tidal basins of high ecological relevance. A three-dimensional hydrodynamic model and offline particle tracking were used to simulate the transport of particle patches over individual tidal periods of the record 1980-2015 using depth-averaged currents. This transport was decomposed into the net displacement of their center of mass (advection) and the tidally averaged rate of change of dispersion from their center of mass (the dispersion coefficient). The results reveal that advection is predominantly wind-driven on the temporal scale of events. Strong winds from the North Sea aligned with the topographical orientation of the system trigger advection comparable to the width of the basins. Although the role of tides in advection is secondary, they induce residual circulation cells near the inlets, particularly evident during weak wind conditions. In contrast, dispersion is controlled by the tides and exhibits filamentous structures with large values around all the DWS inlets. The strength of these structures has a linear correlation with the tidal amplitude, which is mainly modulated by the spring-neap cycle. However, the location of these structures changes predominantly from shallow areas surrounding the channels when particles are released at high tide to within the channels when released at low tide. These findings underscore the distinct separable roles of wind and tides in Lagrangian residual transport within event-driven, multi-inlet coastal systems such as the DWS.

本研究确定并量化了风和潮汐对荷兰瓦登海（DWS）拉格朗日残余输运变异性的独特贡献，这是一个具有高度生态相关性的相互关联潮汐盆地的中潮系统。采用三维水动力模型和离线粒子跟踪方法，利用深度平均流模拟了1980-2015年记录的单个潮汐期粒子斑块的输运。这种输运被分解为它们质心的净位移（平流）和离质心色散的潮汐平均变化率（色散系数）。结果表明，在事件的时间尺度上，平流主要由风驱动。来自北海的强风与该系统的地形方向一致，引发了与盆地宽度相当的平流。虽然潮汐在平流中的作用是次要的，但它们在入海口附近引起残留环流细胞，在弱风条件下尤其明显。相反，色散受潮汐控制，在所有DWS入口周围呈现丝状结构，其值都很大。这些结构的强度与潮幅呈线性相关，潮幅主要受春小潮周期的调制。然而，当颗粒在涨潮时释放时，这些结构的位置主要从通道周围的浅水区域变化到退潮时释放的通道内。这些发现强调了在事件驱动的多入口海岸系统（如DWS）中，风和潮汐在拉格朗日残余运输中的独特可分离作用。

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引用次数: 0

Ecosystem function: Trait diversity, bioturbation, and bio-irrigation potentials of macrobenthic invertebrate communities in the Red Sea 生态系统功能：红海大型底栖无脊椎动物群落的性状多样性、生物扰动和生物灌溉潜力

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-10-29 DOI: 10.1016/j.csr.2025.105593

Seerangan Manokaran , Thadickal V. Joydas , Paravanparambil Rajakumar Jayachandran , Jayanath Gopi , Omer Reshi , Karuppasamy P. Manikandan , Mohamed A. Qurban

The ecosystem functions of macrobenthic invertebrates were studied in the Red Sea. In total, 193 taxa were recorded. The functional traits of biomass (B) and density (D), such as infauna with internal irrigation (B - 53.4 %), blind-ended burrows, no burrow systems (D - 44.5 %), surface filter (B - 41.5 %), and surface deposit feeders (D - 50.8 %) were dominant attributes with significant regional and depth differences. However, irrigation depth 0 to 2 – 5 cm (B - 50 %, D - 45 %); movements through the sediment matrix mobility pattern (B - 68.3 %, D - 47.2 %), and reworking superficial modifiers (B - 54.2 %, D - 45.2 %) also significantly dominated. The functional individuals, biomass, richness, density, and diversity were 11 ± 1 (Mean ± SE) species m⁻², 1.25 ± 0.26 g m⁻², 1.70 ± 0.13 Fd’, 361 ± 57 ind. m⁻², and 2.76 ± 0.11FH' (log²). These indices decreased with increased depth and were higher in the north compared to the central region. The composition of bioturbation potential community index (BPc) and bio-irrigation potential community index (IPc) values was significantly (P < 0.05) higher in the north (29.46 ± 5.48, and 42.12 ± 10.33) and shallower (55.32 ± 12.79, and 83.76 ± 26.93) depth zones. The taxa Aglaophamus dibranchis, holothuria, sand dollar, and Glycinde sp.1 were responsible for higher BPc, and the taxa sand dollar, Spionidae indet. Notomastus latericeus, Glycinde sp.1, and Prionospio spp. contributed higher to IPc. The environmental variables MGS, silt/clay, depth, latitude (region), As, and Fe influenced functional density (P = 0.191) and biomass (P = 0.182), and MGS, depth, latitude, As, Mn, and Pb also influenced bioturbation (P = 0.224) and bio-irrigation (P = 0.218) of the macrobenthic community. Generally, the functional attributes influence deep-sea nutrient cycling by enhancing benthic and pelagic coupling processes on the Red Sea coast, particularly in relation to coastal developmental activities.

对红海大型底栖无脊椎动物的生态系统功能进行了研究。共记录到193个分类群。生物量(B)和密度(D)为优势属性，包括有内灌（B - 53.4%）、盲端穴居、无穴居系统（D - 44.5%）、地表过滤（B - 41.5%）和地表沉积物取食（D - 50.8%），且区域和深度差异显著。然而，灌溉深度0 ~ 2 ~ 5cm (B ~ 50%, D ~ 45%)；通过沉积物基质迁移模式的运动（B - 68.3%, D - 47.2%）和改造表面改性剂（B - 54.2%, D - 45.2%）也显著占主导地位。功能个体、生物量、丰富度、密度和多样性分别为11±1 （Mean±SE）种m−2、1.25±0.26 g m−2、1.70±0.13 Fd′、361±57 ind. m−2和2.76±0.11FH′（log2）。这些指数随深度的增加而降低，北部高于中部。生物扰动潜力群落指数（BPc）和生物灌溉潜力群落指数（IPc）的组成在北部（29.46±5.48,42.12±10.33）和较浅（55.32±12.79,83.76±26.93）深度区显著（P < 0.05）较高。其中，Aglaophamus dibranchis、holothuria、sand dollar和Glycinde sp.1类群的BPc较高，而Spionidae indet类群的BPc较高。Notomastus latericeus、Glycinde sp.1和Prionospio sp.对IPc贡献较大。环境变量MGS、淤泥/粘土、深度、纬度（地区）、As和Fe影响了大型底栖生物群落的功能密度（P = 0.191）和生物量（P = 0.182）， MGS、深度、纬度、As、Mn和Pb也影响了大型底栖生物群落的生物扰动（P = 0.224）和生物灌溉（P = 0.218）。一般来说，功能属性通过加强红海沿岸的底栖生物和中上层生物耦合过程，特别是与沿海发展活动有关的过程，影响深海营养循环。

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引用次数: 0

Early Pleistocene fossil seagrass assemblages on Rhodes Island – a proof of allochthonous origin 罗德岛上的早更新世海草化石组合-异域起源的证据

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-10-27 DOI: 10.1016/j.csr.2025.105594

Katarína Holcová , Martina Havelcová , Sanah Shaikh , Markéta Chroustová , Katarína Šarinová , Filip Scheiner , Petr Kraft , Ivana Sýkorová , Rastislav Milovský

This study investigates fossil seagrass accumulations in the Pliocene–Pleistocene Kritika Formation on Rhodes Island using geochemical, organic petrology and palaeobiological proxies. The studied section can be correlated with the lower Calabrian (1.7–1.6 Ma). Inorganic geochemistry revealed fluctuations between freshwater and marine environments, suggesting a dynamic estuarine environment, as supported by the analysed δ¹³C_org values, which varied from −25.0 to −23.5 ‰. High concentrations of terrestrial organic matter indicate significant riverine input to the coastal area under warm and humid climatic conditions. Further, elevated Ni (720–1100 ppm) and Co (41–60 ppm) concentrations in the sediments indicate a basic/ultrabasic (ophiolitic) sediment source in the catchment area. The absence of marine organisms in these accumulations and reduced estuarine salinity suggest that Posidonia leaves were transported within the estuary rather than deposited in situ. Organic geochemical analyses revealed minor peaks of submerged plant-specific n-alkanes (C₂₁, C₂₃, C₂₅) similar to modern dead Posidonia accumulations. Abundant short even n-alkanes (C₁₆, C₁₈) associated with heterotrophic bacteria and fungi are also present, indicating microbial decomposition. Identical geochemical signatures in samples without Posidonia body fossils confirmed the presence of amorphous organic matter of seagrass origin, further demonstrating that organic geochemical proxies can identify ancient seagrass meadows even in the absence of body fossils.

本文采用地球化学、有机岩石学和古生物学等方法对罗德岛上新世-更新世Kritika组海草化石聚集进行了研究。研究剖面可与下卡拉布里亚（1.7 ~ 1.6 Ma）相对应。无机地球化学显示淡水和海洋环境之间存在波动，表明河口环境是动态的，δ13Corg值在- 25.0 ~ - 23.5‰之间变化。高浓度的陆源有机质表明，在温暖湿润的气候条件下，有大量的河流输入到沿海地区。此外，沉积物中Ni （720 - 1100ppm）和Co （41 - 60ppm）浓度的升高表明该流域的沉积物来源为基性/超基性（蛇绿质）沉积物。这些沉积物中没有海洋生物，并且河口盐度降低，这表明波西多尼叶片在河口内运输，而不是在原地沉积。有机地球化学分析显示，淹没植物特有的正构烷烃（C21, C23, C25）的小峰与现代死Posidonia聚集物相似。与异养细菌和真菌相关的大量短连正构烷烃（C16, C18）也存在，表明微生物分解。未发现Posidonia体化石的样品具有相同的地球化学特征，证实了海草来源的无定形有机物的存在，进一步证明了有机地球化学指标可以在没有体化石的情况下识别古海草草甸。

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引用次数: 0

Thermal fronts variability in the Pacific off Mexico and their impact on chlorophyll 墨西哥外太平洋的热锋变化及其对叶绿素的影响

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-10-25 DOI: 10.1016/j.csr.2025.105600

Erick D. Ruvalcaba-Aroche , Emilio Beier , Laura Sánchez-Velasco

The tropical branch of the California Current (TBCC) converges with tropical waters in the Pacific off Mexico, generating thermal fronts whose hydrographic structure and ecological implications remain poorly understood. Using satellite-derived sea surface temperature (SST) data (2003–2021) and in situ measurements from four oceanographic cruises, this study examines the spatiotemporal variability of thermal fronts and their relationship with chlorophyll-a (CHL) as a proxy for productivity. Fronts were persistent along the peninsular coast, driven by coastal upwelling, with seasonal shifts in distribution: spring showed the highest frontal prevalence south of 24 °N, while summer activity shifted northward (26–28 °N). Autumn and winter exhibited minimal frontal activity. Seasonal variability explained 20–50 % of frontal occurrence in coastal zones and the oceanic zone south of 23 °N but was negligible offshore. The cold phase of ENSO (La Niña) correlated with enhanced frontal activity and elevated CHL, particularly south of 24 °N. A significant positive correlation between frontal probability and mesoscale CHL anomalies highlighted two key oceanic regions where fronts likely boost productivity: near Punta Eugenia (25–29 °N) and Cabo San Lucas (20–24 °N), especially in spring and summer. In situ data revealed that spring fronts featured steep thermocline slopes and coincided with CHL gradients, whereas autumn fronts lacked vertical structure and ecological influence. These findings underscore the role of thermal fronts in modulating productivity in the TBCC, particularly during spring and summer, while emphasizing the limited ecological impact of density-compensated fronts in autumn.

加利福尼亚流（TBCC）的热带分支在墨西哥附近的太平洋与热带水域汇合，产生热锋，其水文结构和生态影响仍然知之甚少。利用2003-2021年卫星海表温度（SST）数据和4次海洋巡航的现场测量数据，研究了热锋的时空变化及其与叶绿素-a （CHL）的关系，并以此作为生产力的代表。在海岸上升流的驱动下，锋面沿半岛海岸持续存在，其分布具有季节变化特征：春季锋面盛行度在24°N以南最高，夏季锋面活动向北移动（26-28°N）。秋季和冬季的锋面活动最小。季节变化解释了沿海带和23°N以南海域锋面发生的20 - 50%，但近海可以忽略不计。ENSO的冷期（La Niña）与锋面活动增强和CHL升高相关，特别是在24°N以南。锋面概率与中尺度CHL异常之间的显著正相关突出了锋面可能提高生产力的两个关键海洋区域：Punta Eugenia（25-29°N）和Cabo San Lucas（20-24°N）附近，特别是在春季和夏季。原位资料显示春季锋面具有陡峭的温跃层坡度，与CHL梯度一致，而秋季锋面缺乏垂直结构和生态影响。这些发现强调了热锋在调节TBCC生产力方面的作用，特别是在春季和夏季，同时强调了秋季密度补偿锋的生态影响有限。

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引用次数: 0

Corrigendum to “A three-year survey of hatched elasmobranch egg capsules on Santa Catarina Island, Southern Brazil” [Cont. Shelf Res. 293 (2025) 105528] “对巴西南部圣卡塔琳娜岛孵化的依拉斯莫科卵壳的三年调查”的勘误[参见Shelf Res. 293 (2025) 105528]

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-10-24 DOI: 10.1016/j.csr.2025.105568

Carlos Alberto da Silva Junior , Guilherme Burg Mayer , Áthila Andrade Bertoncini , Rafael de Lima , Renato Hajenius Aché de Freitas

引用次数: 0

Taming turbulence closure in tidally driven simulations of coastal oceans and estuaries 沿海海洋和河口潮汐驱动模拟中的驯服湍流闭合

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-10-22 DOI: 10.1016/j.csr.2025.105596

Ramsey R. Harcourt, John B. Mickett, K. Ravi Prakash

A widespread prevalence of subsurface acoustic ducts impacting mid-frequency sound propagation was observed over the outer shelf and the continental slope during a field experiment in July–August 2022 in the Pacific Northwest coastal ocean of North America. Simulations of the coastal shelf ocean using LiveOcean, a tidally driven operational model (MacCready et al., 2021), based upon a widely used variant of the Regional Ocean Modeling System (ROMS), were compared with observations of the thermohaline stratification layers responsible for the ducts, and found to have a nearly complete absence of these acoustic features due to excessive parametrized mixing. After implementing additional realistic constraints in the ‘k-ε’ second moment closure (SMC) to control instabilities in the turbulence mixing model with low background mixing, the source of instabilities was identified in a coding error for the default, third-order upstream advection of the turbulence parameters for TKE k and its dissipation ε, a longstanding and significant bug impacting mixing parametrization, and one also found in the older SMC ‘Mellor-Yamada 2.5’ mixing parametrization option in ROMS. With code improvements, LiveOcean was able to successfully simulate the production of observed subsurface acoustic ducts. The primary process for generating the ducts along the outer shelf involves the southward transport of low sound speed water during upwelling, combined with the cross-shelf displacement of higher sound speed water from offshore beneath this layer in bottom-driven Ekman transport.

2022年7 - 8月，在北美太平洋西北沿海海域进行的一次野外实验中，观察到外大陆架和大陆斜坡上广泛存在影响中频声传播的地下声管道。基于广泛使用的区域海洋模拟系统（ROMS）的变体，使用潮汐驱动的操作模型LiveOcean （MacCready等人，2021年）对沿海大陆架海洋进行了模拟，并将其与负责管道的热盐层的观测结果进行了比较，发现由于过度的参数化混合，几乎完全没有这些声学特征。在“k-ε”二阶矩闭包（SMC）中加入额外的现实约束以控制低背景混合的湍流混合模型的不稳定性后，不稳定性的来源是TKE k的湍流参数默认的三阶上游平流及其耗散ε的编码错误，这是一个长期存在且影响混合参数化的重要错误。在ROMS中的旧SMC“Mellor-Yamada 2.5”混合参数化选项中也发现了一个。通过对代码的改进，LiveOcean能够成功地模拟观测到的地下声学管道的生产。沿外大陆架形成风道的主要过程包括上升流期间低声速水的向南输送，以及该层下方海上高声速水在底部驱动的Ekman输送中跨大陆架位移。

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引用次数: 0

Ebb-tidal delta and sand bar construction offshore Shell Island, Florida 滩涂三角洲和沙洲建设近海贝壳岛，佛罗里达州

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-10-22 DOI: 10.1016/j.csr.2025.105597

John A. Goff

The shoreface is a highly dynamic sedimentary environment, and also a challenging one to obtain stratigraphic data due to shallow depths and surf zone condition. A pole-mounted chirp subbottom profiler survey was conducted in May 2021 along the shoreface of Shell Island, Florida. These data are investigated with the aim characterizing sediment dynamics of an underwater unexploded ordinance test bed location. The Shell Island shoreface consists of three principal sedimentary units in the shallow subsurface. The substrate consists of the MAFLA marine sand sheet, which is organized into oblique-to-shore sand ridges, and which merges with the barrier island sands of Shell Island. Along the lower shoreface/inner shelf, this substrate is overlain by an ebb-tidal delta unit associated with sands exiting through St. Andrews Pass, the 1930's-era ship channel constructed by the US-Amy Corps of Engineers for access to Saint Andrews Bay, and transported to the SE. The ebb-tidal delta is prograding alongshore to the SE, as evidenced by the internal dipping reflectors, and consistent with the measured sediment transport direction. I calculate that the ebb-tidal delta has grown by ∼0.92x10⁶ m³/yr since the opening of the Pass. Along the upper shoreface, the substrate is overlain by the nearshore sandbar, organized into crescentic morphology of alternating highs and lows with a spacing of ∼750 m alongshore. The sand bars are underlain by a strong seaward-dipping reflector, inferred to be the basal surface for mobile sands. The sand bars overlie the ebb-tidal delta unit, indicating a prograding shoreline.

岸面是一个高度动态的沉积环境，由于深度较浅和冲浪带条件的限制，也给地层资料的获取带来了挑战。2021年5月，沿着佛罗里达州Shell岛的海岸进行了一项杆式啁啾海底剖面仪调查。对这些数据进行了研究，目的是表征水下未爆弹药试验台位置的泥沙动力学。贝岛岸面由浅层地下的三个主要沉积单元组成。基底由MAFLA海相砂片组成，形成斜向海岸的砂脊，并与贝壳岛堰洲岛砂相融合。沿着较低的滨面/内层陆架，基底上覆盖着一个与圣安德鲁斯山口（St. Andrews Pass）出沙有关的退潮三角洲单元，圣安德鲁斯山口是20世纪30年代由美国工程兵团建造的通往圣安德鲁斯湾的船舶通道，并被运输到东南部。内部倾斜反射体表明，潮退三角洲沿海岸向东南推进，与实测输沙方向一致。我计算出，自关口开放以来，退潮三角洲以每年0.92 × 106立方米的速度增长。沿着上岸面，基底被近岸沙洲覆盖，形成月牙形的高低交替形态，岸面间距约750米。砂坝下部有一个强烈的向海倾斜反射面，推断为流动砂的基面。沙洲覆盖在潮退三角洲单元上，表明海岸线在向前推进。

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引用次数: 0

Characterisation of the eddy-driven variability inshore of the Agulhas Current using sea surface temperature observations 利用海面温度观测表征阿古拉斯海流近岸涡旋驱动的变率

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-10-22 DOI: 10.1016/j.csr.2025.105598

N. Burgher , L. Braby , S. Herbette , JC Hermes , MJ Roberts

Off the east coast of South Africa, coastal waters inshore of the Agulhas Current are largely affected by oceanic mesoscale turbulence, primarily in the form of meanders such as Natal Pulses and Durban Eddies. This study utilises forty years of modern, high-resolution satellite sea surface temperature (SST) data, offering both improved spatial detail and a longer time series than previous products, to characterise these eddies using an automated meander detection algorithm. Notably, automated detection has never before been applied to Durban Eddies, and Natal Pulses have not been analysed using such a high-resolution, long-term SST dataset. The algorithm successfully estimated the daily position of the inshore edge and core of the Agulhas Current and the “first occurrence” of Agulhas waters for the period of the study —the latter defined as the initial emergence of Agulhas Current waters in a filament or plume associated with Natal Pulses. The analysis reveals that the inshore edge of the Agulhas Current is not subject to seasonal variation but is significantly influenced by the presence of Natal Pulses and Durban Eddies. The first occurrence of Agulhas Current waters was only detected during the passage of Natal Pulses. Results indicate increased variability in regions south of 29.8°S, with Natal Pulses showing an increase in size and surface lifespan in the southern region. Conversely, Durban Eddies exhibit a decrease in size and surface lifespan as they propagate southward. Furthermore, seasonal SST anomalies are generally small, with cold events more frequent; Natal Pulses cause higher variability, while Durban Eddies maintain relative stability.

在南非东海岸外，阿古拉斯洋流近岸的沿海水域很大程度上受到海洋中尺度湍流的影响，主要以曲流的形式出现，如纳塔尔脉冲和德班涡流。这项研究利用了四十年的现代高分辨率卫星海面温度（SST）数据，提供了比以前产品更好的空间细节和更长的时间序列，使用自动曲流检测算法来表征这些漩涡。值得注意的是，自动化检测以前从未应用于德班涡旋，而纳塔尔脉冲也没有使用如此高分辨率的长期海温数据集进行分析。该算法成功地估计了阿古拉斯洋流近岸边缘和核心的每日位置，以及研究期间阿古拉斯洋流的“首次出现”——后者被定义为阿古拉斯洋流在与纳塔尔脉冲相关的细丝或羽状物中首次出现。分析表明，阿古拉斯海流的近岸边缘不受季节变化的影响，但受到纳塔尔脉冲和德班涡流的显著影响。阿古拉斯洋流的第一次出现是在纳塔尔脉冲通过期间才发现的。结果表明，29.8°S以南地区的变异性增加，Natal脉冲显示南部地区的大小和表面寿命增加。相反，德班涡旋在向南传播的过程中，其大小和表面寿命都在减少。此外，季节海温异常一般较小，冷事件更频繁；纳塔尔脉冲引起较高的变异性，而德班涡流保持相对稳定。

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引用次数: 0

Elevated meroplankton abundance in surface slicks during internal wave forcing at three coastal sites in Mexico 在墨西哥三个沿海地点的内波强迫下，浮油表面浮游生物丰度升高

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-10-22 DOI: 10.1016/j.csr.2025.105599

Lydia B. Ladah , Andrea Lievana Mactavish , María del Refugio Barba López , James J. Leichter , Fabian J. Tapia , Anatoliy Filonov

The supply of meroplanktonic larvae to coastal habitats by physical transport mechanisms is important for the persistence of benthic marine invertebrate populations. Larvae can accumulate in convergent bands that are often visible as smooth surface slicks in areas where surfactants reduce capillary waves. Slicks can form above passing troughs of internal waves, which occur on most coasts during stratified periods. In this study, during periods of strong internal wave forcing under spring tide conditions in three bays along the Mexican coastline, we sampled high-frequency (f ≥ 1 cycle h⁻¹) changes in the abundance of marine meroplankton. Concurrently, we recorded visual observations of surface slicks and measured physical conditions in the water column (i.e., temperature and currents). Surface slicks were observed at all three sites, with over 70% occurring at times theoretically predicted from current flows. The slick periods showed warmer temperatures or lower strain values, suggesting slicks may be associated with warm convergence zones. Chthamaloid cyprids and mussel veligers were the dominant meroplankton found, with their abundance being significantly greater (2–6 times) within slicks at all sites and a significant positive relationship with temperature found at 2 of the 3 sites. These results support the hypothesis that plankton accumulation does occur in visible surface slicks. We propose that the slicks measured in this study were related to internal wave convergence zones, meriting further exploration as important mechanisms of plankton accumulation.

通过物理运输机制向沿海生境提供浮游生物幼虫对底栖海洋无脊椎动物种群的持续存在具有重要意义。幼虫可以聚集在会聚带中，在表面活性剂减少毛细波的区域，通常可以看到光滑的表面。浮油可以在经过的内波槽上方形成，在分层期间，内波槽会出现在大多数海岸。在本研究中，在墨西哥沿海三个海湾的大潮条件下，在强烈的内波强迫期间，我们采样了海洋浮游生物丰度的高频（f≥1周期h−1）变化。同时，我们记录了表面浮油的目视观察，并测量了水柱中的物理条件（即温度和水流）。在所有三个地点都观察到表面浮油，超过70%的浮油发生在理论上预测的水流中。浮油期温度较高或应变值较低，表明浮油可能与暖辐合带有关。Chthamaloid鲷和贻贝鲷是主要的浮游生物，它们的丰度在所有站点的浮油中都显著增加（2 - 6倍），并且在3个站点中有2个站点与温度呈显著正相关。这些结果支持浮游生物聚集确实发生在可见表面浮油的假设。我们认为本研究测量到的浮油与内波辐合带有关，作为浮游生物聚集的重要机制值得进一步探索。

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引用次数: 0

Utilizing community-led citizen science in delineating population structure of an anadromous hilsa shad (Tenualosa ilisha) from Indian coastal shelf 利用社区主导的公民科学，描绘了印度沿海陆架溯河鲑的种群结构

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-10-21 DOI: 10.1016/j.csr.2025.105595

Kritish De , Arvind Kumar Dwivedi

Community-led citizen science (CCS) involves engaging the public through effective training for low-cost data collection, monitoring, policy development, and the dissemination of scientific information. This research aimed to train local fishers to capture and share images of Indian shad (Tenualosa ilisha) using Smartphones obtained from the coastal shelf of five river mouth systems (RMS) – Narmada, Tapi, Hooghly, Mahanadi, and Godavari. These images were employed to identify T. ilisha specimens and analyze their population structure using geometric morphometric (GM) techniques based on body shape. The GM approach validated the fishers' ability to correctly identify the species with 100 % accuracy. Additionally, variations in the body shape of T. ilisha were noted between the east and west coasts and among RMS on the east coast (Hooghly, Mahanadi, and Godavari), but not among those on the west coast (Narmada and Tapi). The findings of the present study suggest that CCS is promising in effectively contributing to marine and coastal biodiversity monitoring. Nevertheless, challenges such as electricity shortages, poor internet connectivity, limited technological resources, and low voluntary participation in poverty-stricken remote areas may impact CCS programs. These challenges can be addressed through promoting socio-economic development of local communities through remuneration-based CCS and alternative livelihood options. Coordinated efforts among all stakeholders, including environmental managers and policymakers is essential for better utilization of CCS in sustainable marine policies and improving ocean governance.

社区主导的公民科学（CCS）涉及通过低成本数据收集、监测、政策制定和科学信息传播方面的有效培训让公众参与进来。这项研究旨在培训当地渔民使用从五个河口系统（RMS）的海岸架上获得的智能手机捕捉和分享印度鲥鱼（Tenualosa ilisha）的图像，这五个河口系统是纳尔默达、塔皮、胡格利、马哈纳迪和戈达瓦里。利用这些图像对柽柳标本进行鉴定，并利用基于体型的几何形态测量技术对其种群结构进行分析。转基因方法验证了渔民正确识别物种的能力，准确率达到100%。此外，在东西海岸之间以及东海岸的RMS （Hooghly， Mahanadi和Godavari）之间，发现了T. ilisha体型的变化，但在西海岸的RMS （Narmada和Tapi）中没有。本研究的结果表明，CCS有望有效地促进海洋和沿海生物多样性监测。然而，电力短缺、互联网连接不佳、技术资源有限、贫困偏远地区志愿者参与度低等挑战可能会影响CCS项目。这些挑战可以通过以报酬为基础的CCS和替代生计方案促进当地社区的社会经济发展来解决。包括环境管理者和政策制定者在内的所有利益相关者之间的协调努力对于在可持续海洋政策中更好地利用CCS和改善海洋治理至关重要。

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