Continental Shelf Research最新文献_第7页

On the interaction of mode-1 Internal Solitary Wave with higher modes to the west of northern Nicobar Islands 尼科巴群岛北部西部1型内孤立波与高模态的相互作用

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-09-08 DOI: 10.1016/j.csr.2025.105564

Jithendra Raju Nadimpalli , Mihir Kumar Dash , Ibrahim Hoteit

The synthetic aperture radar (SAR) image acquired on 23 April 2004 at 03:33 UTC by the Envisat shows the separation of short wavelength internal waves from the westward propagating mode-1 ISW generating from a shallow ridge connecting Batti Malv and Chowra Islands (SBM) of the northern Nicobar Islands, India. To investigate the presence of tailless mode-1 ISWs, several other SAR images near the SBM are analyzed. A particular SAR image captured on 12 October 2007 at 15:53 UTC reveals two different higher-mode ISWs in the path of the mode-1 ISW. Fitting the locations of the ISW signatures onto a time-distance curve shows that one of the higher modes is generated locally, while others are generated from SBM. Using simulations of a nonhydrostatic numerical model SUNTANS, we show that the SBM generated westward propagating mode-1 ISW overtakes the locally generated mode-3 ISW and a mode-2 ISW formed over the SBM in the previous tidal cycle. It is shown that the interaction process of the first mode with higher modes results in the formation of short internal waves trailing behind higher mode waves, pertaining to the resonance between the tail of mode-1 ISW and the higher mode solitary wave. Hence, close to a spring tide, with a combination of SAR images and numerical simulations, we show the dynamical process of westward propagating mode-1 ISW from SBM with the higher modes.

由Envisat于2004年4月23日03:33 UTC获得的合成孔径雷达（SAR）图像显示，从印度北部尼科巴群岛连接巴蒂马尔夫群岛和乔拉群岛（SBM）的浅海脊向西传播的模式1 ISW产生的短波内波分离。为了研究无尾1型isw的存在，分析了SBM附近的其他几张SAR图像。2007年10月12日15时53分拍摄的SAR图像显示，在第一模式ISW的路径上有两个不同的高模式ISW。将ISW信号的位置拟合到时间-距离曲线上表明，其中一个较高的模态是本地产生的，而其他模态则是由SBM产生的。利用非流体静力数值模式SUNTANS的模拟，我们发现SBM产生的向西传播的1型ISW超过了局地产生的3型ISW和上一个潮汐旋回在SBM上形成的2型ISW。结果表明，第一阶模态与高阶模态的相互作用过程导致短内波尾随在高阶模态波后，这与1阶ISW的尾部与高阶模态孤立波之间的共振有关。因此，在接近一次大潮的情况下，结合SAR图像和数值模拟，我们展示了SBM向西传播高模态1型ISW的动力学过程。

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引用次数: 0

Analysis of the uncertainties in tidal constants obtained from short tide gauge records and their value for tidal studies 短验潮仪记录潮汐常数的不确定度分析及其对潮汐研究的价值

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-09-02 DOI: 10.1016/j.csr.2025.105565

M.S. Filmer , P.L. Woodworth , S.D.P. Williams , S.J. Claessens

We conduct a study to estimate uncertainties in tidal constants from M2, S2, N2, K1, O1, Q1 and related K2, P1, 2N2 constituents from 35-day tide gauge records in the northern Australia and Papua New Guinea regions. The motivation for this study stems from the availability of ∼300 short tide gauge records (most ∼ 30 days long) in these regions, but their accuracy for tidal studies is not clear. We simulate the 35-day uncertainties by dividing a selected set of 14 long tide gauge records (19-years where available) from the GESLA3 data set into consecutive 35-day sections. Amplitudes and phase lags computed from each long record are treated as the ‘true’ values, from which we compute and analyse inference information for the short records. Comparison of empirical amplitude ratios and phase lag differences with the relationships from the Equilibrium tide show significant differences in both amplitude and phase lag in some constituents and locations. We also compare inference information derived from the FES2022b ocean tide model, which suggests that such models could be used in this way in some instances. Empirical uncertainties in the 35-day records were no more than 0.045 m with maximum errors reaching 0.093 m. The largest 35-day errors appeared in the K1 constituent, mostly in the Torres Strait and northwest Australia. Empirical inference information showed improvement on the Equilibrium assumption for S2 and K1 reference constituents and related constituents K2, 2N2 and P1, demonstrating that the latter can be accurately derived from short records with accurate inference information.

利用澳大利亚北部和巴布亚新几内亚地区35 d验潮仪记录，对M2、S2、N2、K1、O1、Q1及相关的K2、P1、2N2组分潮汐常数的不确定性进行了估算。这项研究的动机源于这些地区约300个短潮汐计记录（大多数约30天）的可用性，但它们对潮汐研究的准确性尚不清楚。我们通过将GESLA3数据集中的14个长潮汐计记录（如有19年）划分为连续的35天段来模拟35天的不确定性。从每个长记录中计算的振幅和相位滞后被视为“真实”值，从中我们计算和分析短记录的推理信息。将经验振幅比和相位滞后差与平衡潮的关系进行比较，可以发现某些成分和位置的振幅和相位滞后都存在显著差异。我们还比较了从FES2022b海潮模型得到的推断信息，这表明这些模型可以在某些情况下以这种方式使用。35 d记录的经验不确定度不大于0.045 m，最大误差为0.093 m。最大的35天误差出现在K1组成部分，主要在托雷斯海峡和澳大利亚西北部。经验推断信息对S2和K1参考成分以及相关成分K2、2N2和P1的平衡假设进行了改进，表明后者可以通过准确的推断信息准确地从短记录中推导出来。

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引用次数: 0

Shear instabilities in Internal Solitary Waves under high and low-wind regimes 高、低风条件下内孤立波的剪切不稳定性

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-09-02 DOI: 10.1016/j.csr.2025.105561

Jorge M. Magalhaes , Martin J. Coubard , José C.B. da Silva , Maarten C. Buijsman , Ana Isabel Santos , Ana Amorim , Paulo B. Oliveira

Wind and Internal Solitary Waves (ISWs) are well-known to mix the ocean's surface and inner stratification, but their combined effects appear to have not yet been investigated. A large ensemble of ISWs measured off the Portuguese Coast reveals that wind and ISWs may combine to increase turbulence and mixing beyond the linear combination of their individual contributions. It is found that low bulk Richardson numbers (

R i < \frac{1}{4}

) and temperature inversions increase respectively by nearly four-fold and an order of magnitude, when comparing ISWs propagating under high and low-wind regimes. Furthermore, depth ranges where

R i < \frac{1}{4}

associated with ISWs propagating with high winds are observed to extend at least between unperturbed thermocline and intermediate depths. Understanding how turbulence and mixing from ISWs and wind combine may have important implications ranging from parametrizations in ocean models to our understanding of biogeochemical processes modulated by diapycnal mixing.

众所周知，风和内孤立波（ISWs）可以混合海洋表面和内部分层，但它们的综合效应似乎尚未被研究。在葡萄牙海岸测量的大型isw集合表明，风和isw可能联合起来增加湍流和混合，超出了它们各自贡献的线性组合。研究发现，当比较在高风和低风条件下传播的isw时，低体积理查德森数（Ri<14）和逆温分别增加了近四倍和一个数量级。此外，观测到与isw伴随大风传播相关的Ri<；14的深度范围至少在未扰动的温跃层和中间深度之间延伸。了解来自isw和风的湍流和混合如何结合可能具有重要的意义，从海洋模式的参数化到我们对由双周期混合调节的生物地球化学过程的理解。

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引用次数: 0

Frontal features and mixing regimes along the shelf region of the Southern Benguela upwelling system 南本格拉上升流系统陆架区锋面特征和混合机制

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-09-02 DOI: 10.1016/j.csr.2025.105560

Jonathan Rogerson , Jennifer Veitch , Samantha Siedlecki , Sarah Fawcett

Mesoscale fronts are ubiquitous features in all Eastern Boundary Upwelling Systems and are the result of prominent sea surface temperature (SST) gradients and baroclinic jets. Their seasonal variability and presence can impact the horizontal mixing patterns of particles and nutrients. Here, we examine the role of alongshore fronts in shaping the seasonal patterns of cross-shore mixing, residence times, and surface particle transport along the shelf region of the Southern Benguela Upwelling System. Using a numerical ocean model together with a front-detection algorithm, Lagrangian particle tracking, and Finite Time Lyapunov Exponents, we investigate mesoscale frontal variability. In summer, fronts are typically long and continuous alongshore features that are defined by strong SST gradients and associated with prominent Lagrangian Coherent Structures (LCSs). These fronts can act as cohesive barriers that limit cross-shore mixing and offshore advection of particles. In winter, fronts are generally found further offshore and are more filamentous and numerous compared to summer. Furthermore, they are defined by weaker SST frontal gradients and shorter frontal lengths. Fronts in winter are not associated with any obvious LCSs, which implies that particles and material experience greater rates of dispersion and cross-shore mixing. Lagrangian float experiments confirm this and show surface particle trajectories in winter to be more variable and chaotic compared to the more uniform patterns observed in summer. Therefore, defined alongshore fronts in summer aid in the retention of particles on the shelf. The seasonal erosion of these defined frontal features allows for greater cross-shore mixing of particles, water masses and nutrients in the upper water column during winter.

中尺度锋面是所有东边界上升流系统中普遍存在的特征，是海温梯度和斜压射流突出的结果。它们的季节性变化和存在会影响颗粒和养分的水平混合模式。在这里，我们研究了沿南本格拉上升流系统陆架区域沿岸锋在形成跨海岸混合、停留时间和表面粒子运输的季节性模式中的作用。利用数值海洋模型，结合锋面检测算法、拉格朗日粒子跟踪和有限时间李雅普诺夫指数，研究了中尺度锋面变化。在夏季，锋面通常是长而连续的沿岸特征，由强烈的海温梯度定义，并与突出的拉格朗日相干结构（LCSs）相关。这些锋面可以作为内聚屏障，限制跨海岸混合和离岸粒子平流。在冬季，锋面通常出现在离岸更远的地方，与夏季相比，锋面的丝状物更多，数量也更多。海温锋面梯度较弱，锋面长度较短。冬季锋面与任何明显的LCSs无关，这意味着粒子和物质经历了更大的分散和跨岸混合速率。拉格朗日浮子实验证实了这一点，并显示与夏季观察到的更均匀的模式相比，冬季的表面粒子轨迹更加多变和混乱。因此，在夏季，确定的沿岸锋面有助于保留大陆架上的颗粒。这些明确的锋面特征的季节性侵蚀使得冬季上层水柱中的颗粒、水团和营养物质有更大的跨岸混合。

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引用次数: 0

Genetic differentiation in populations of two snappers, Lutjanus malabaricus and Pristipomoides multidens, in the Makassar Strait and adjacent waters, Indonesia: Implications for management 印度尼西亚望加锡海峡及邻近海域两种鲷鱼种群的遗传分化：对管理的启示

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-09-01 DOI: 10.1016/j.csr.2025.105563

Tri Ernawati , Mennofatria Boer , Mohammad Mukhlis Kamal , Nurlisa Alias Butet , Fayakun Satria , Peter J. Mous

The Makassar Strait and adjacent waters, which is crossed by the Wallace line, has variations in bathymetry and unique ocean currents. This condition allows for genetic differences in the Malabar blood snapper (Lutjanus malabaricus) and the Goldband snapper (Pristipomoides multidens) in the strait. Specimens were collected from some landing bases in Makassar Strait and adjacent waters as part of Indonesia's Fisheries Management Area (FMA) 713 and assessed using d-loop mtDNA. Both L.malabaricus and P.multidens obtained the same sequencing results of around 400 bp with 67 and 71 of number haplotypes, respectively. The results of the polymorphism of the two species showed high genetic diversity (L.malabaricus: h = 0.9284, π = 0.0434; P.multidens: h = 0.9766, π = 0.0532). Based on differences analysis to examine the population genetic structure showed different results. L.malabaricus was identified as having no population genetic structure. On the other hand, P. multidens has significant (Φ_ST = 0.07010, p < 0.001) structural differences among sub-areas, the western part of the Makassar Strait, the eastern part of the Makassar Strait, and south of the Makassar Strait, Flores Sea. The different stock units need to be considered in the development of fisheries management and surveillance. Management of fish resources requires a flexible and adaptive approach, taking into account the fishery characteristics of each population and the broad ecosystems in which they occur.

望加锡海峡和华莱士线所穿过的邻近水域，在水深和独特的洋流方面都有变化。这种情况允许海峡中马拉巴尔血鲷（Lutjanus malabaricus）和金带鲷（pritipomoides multidens）的遗传差异。从印度尼西亚渔业管理区（FMA） 713的望加锡海峡和邻近水域的一些登陆基地收集标本，并使用d-环mtDNA进行评估。malabaricus和multidens的测序结果相同，分别在400 bp左右，分别有67和71个单倍型。两种植物的多态性分析结果显示：L.malabaricus: h = 0.9284, π = 0.0434； P.multidens: h = 0.9766, π = 0.0532；基于差异分析对种群遗传结构的检验显示出不同的结果。malabaricus不具有群体遗传结构。另一方面，在望加锡海峡西部、望加锡海峡东部、望加锡海峡南部、弗洛勒斯海的子区域间，多登云雀具有显著的结构差异（ΦST = 0.07010, p < 0.001）。在发展渔业管理和监测时需要考虑到不同的种群单位。鱼类资源的管理需要采取灵活和适应的办法，同时考虑到每个种群的渔业特点和它们所处的广泛生态系统。

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引用次数: 0

Potential human consumption risks from microplastics and non-synthetic microfibers in cultured oysters from a low-human-impact lagoon 低人类影响泻湖养殖牡蛎中微塑料和非合成微纤维的潜在人类消费风险

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-08-31 DOI: 10.1016/j.csr.2025.105562

Lucy Coral Alarcón-Ortega , Nancy Ramírez-Álvarez , Félix Augusto Hernández-Guzmán , Eduardo Antonio Lozano-Hernández

Coastal lagoons are ecologically and economically important ecosystems, serving as nursery areas for marine species, providing coastal protection, and filtering pollutants. Despite their significance, these environments are increasingly exposed to various contaminants, including microplastics (MPs) and non-synthetic microfibers (NSMs), which are pervasive in ecosystems worldwide. Due to their size, they can be ingested by marine organisms and transferred to higher trophic levels, posing a risk to marine life and human health. NSMs and MPs were identified and quantified in farmed oysters (Magallana gigas) and in surface water, bottom water, and sediments from a rural coastal lagoon in Baja California, Mexico. Once the samples were collected, the organic matter was removed, filtered, and finally, the particles were separated according to their shape, color, and size. The chemical composition of the particles was analyzed using μ-FTIR-ATR. The most frequently identified polymers were cellulose, cotton, and polyester, common across all matrices. Polypropylene was predominant only in surface water samples. These findings highlight the diverse sources and potential behaviors of MPs and NSMs in the lagoon. Although the lagoon experiences low anthropogenic impact and limited runoff, it is not exempt from pollution. The detection of MPs and NSMs in water, sediment, and oysters reflects the vulnerability of coastal lagoons to pollutants. It suggests a need for continued monitoring better to understand potential implications for ecosystem and human health.

沿海泻湖是生态和经济上重要的生态系统，作为海洋物种的育苗区，提供海岸保护，过滤污染物。尽管这些环境具有重要意义，但它们越来越多地暴露于各种污染物中，包括在全球生态系统中普遍存在的微塑料（MPs）和非合成微纤维（nsm）。由于它们的大小，它们可以被海洋生物摄入并转移到更高的营养水平，对海洋生物和人类健康构成风险。在墨西哥下加利福尼亚州农村沿海泻湖的养殖牡蛎（Magallana gigas）以及地表水、底水和沉积物中鉴定和量化了nsm和MPs。一旦样品被收集，有机物被去除，过滤，最后，颗粒根据它们的形状，颜色和大小被分离。采用μ-FTIR-ATR分析了颗粒的化学成分。最常识别的聚合物是纤维素、棉花和聚酯，在所有基质中都很常见。聚丙烯仅在地表水样品中占主导地位。这些发现突出了泻湖中MPs和nsm的不同来源和潜在行为。虽然泻湖的人为影响很小，径流有限，但它也不能免于污染。水、沉积物和牡蛎中MPs和NSMs的检测反映了沿海泻湖对污染物的脆弱性。这表明需要继续进行更好的监测，以了解对生态系统和人类健康的潜在影响。

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引用次数: 0

Wave climate at Babitonga Bay using hybrid downscaling 巴比通加湾的波浪气候使用混合降尺度

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-08-23 DOI: 10.1016/j.csr.2025.105551

Rodrigo Zanette , Marília S. Ramos , Mario Luiz Mascagni , Antonio H.F. Klein , Leandro Farina

This study presents a comprehensive analysis of the wave climate in Babitonga Bay, Brazil, using a hybrid downscaling approach. By integrating dynamic and statistical techniques, we effectively transferred CAWCR oceanic wave reanalysis data (1979 to 2022), for a point on the continental shelf to the coastal region, focusing on the ports of São Francisco do Sul and Itapoá. The methodology included selecting representative sea states, propagating them with the SWAN wave model, and reconstructing the time series using radial basis function interpolation. Validation against observational data at three ADCP stations showed that the hybrid downscaling results more accurately captured wave parameters compared to CAWCR hindcast, particularly at shallow water stations (4–7 m depth) where the downscaled significant wave heights closely tracked measured values, highlighting the effectiveness of the downscaling approach. Furthermore, the analysis reveals a bimodal wave climate at each port, distinguishing between the persistent, operational wave conditions and less frequent but distinct swell events from a secondary direction, a critical insight for risk assessment. The study provides detailed 2D and 3D analyses of wave parameters such as significant wave height (

H_{s}

), peak period (

T_{p}

), and wave direction, revealing crucial insights into wave age and height dynamics in São Francisco do Sul. These findings offer valuable data for coastal management and infrastructure planning in Babitonga Bay and similar regions. The hybrid downscaling methodology presented here proves to be an efficient and reliable tool for characterizing wave climate in port regions, providing essential information for safe navigation and port operations in São Francisco do Sul and Itapoá.

本研究采用混合降尺度方法对巴西Babitonga湾的波浪气候进行了综合分析。通过整合动力和统计技术，我们有效地将大陆架上某点的CAWCR海浪再分析数据（1979 - 2022）转移到沿海地区，重点是南奥弗朗西斯科港和伊塔波港。方法包括选择代表性海况，利用SWAN波浪模型传播海况，利用径向基函数插值重建时间序列。对三个ADCP站观测数据的验证表明，与CAWCR后播相比，混合降尺度结果更准确地捕获了波浪参数，特别是在浅水站（4-7 m深度），降尺度的有效波高与实测值密切相关，突出了降尺度方法的有效性。此外，分析还揭示了每个港口的双峰波气候，区分了持续的、可操作的波浪条件和次要方向上不太频繁但明显的涌浪事件，这是风险评估的关键见解。该研究提供了详细的二维和三维波浪参数分析，如有效波高（Hs）、峰值周期（Tp）和波浪方向，揭示了南弗朗西斯科岛波浪年龄和高度动力学的重要见解。这些发现为Babitonga湾和类似地区的海岸管理和基础设施规划提供了有价值的数据。本文提出的混合降尺度方法被证明是表征港口地区波浪气候的有效和可靠的工具，为南奥弗朗西斯科和伊塔波的安全航行和港口作业提供了必要的信息。

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引用次数: 0

Marine heatwaves detected by a network of buoys along the entire US West Coast Shelf 整个美国西海岸大陆架浮标网络探测到的海洋热浪

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-08-22 DOI: 10.1016/j.csr.2025.105552

Gavin Plume , Ryan K. Walter , Piero L.F. Mazzini , Michael Dalsin

Marine heatwaves (MHWs), prolonged periods of anomalously warm waters, pose an increasing threat to marine ecosystems globally. While satellite-based data offer insights into MHW patterns, coastal upwelling regions are prone to satellite biases and require long-term in-situ datasets for accurate characterization. Using two decades of temperature data from 22 surface buoys distributed along the US West Coast continental shelf (10–50 km offshore) spanning nearly 2000 km of coastline, we investigated, for the first time, coast-wide patterns of MHWs in this valuable region. The spatial extent of MHWs varied from 100% of buoys during the 2014–2016 North Pacific MHW, to less than 50% during regional events, to single buoys, highlighting the broad range of MHW scales and drivers. Upwelling was a strong contributor to MHW patterns, both on seasonal time scales with less MHWs during the spring/summer upwelling season, as well as synoptic time scales with the initiation and termination of MHWs linked with anomalously weak and strong upwelling, respectively. This was especially evident in central and northern California, where upwelling intensity and variability were stronger and regional co-occurrence lower, than in southern California and Oregon/Washington, where upwelling was weaker and regional co-occurrence higher. Furthermore, there were almost no long-term trends in MHW metrics along the coast, suggesting this region could serve as a thermal refugia in a warming ocean. Effective management and forecasting of coastal MHWs in this region will require capturing a broad range of spatial scales and drivers, with site-specific studies and/or high-resolution models important in many cases.

海洋热浪（MHWs）是指长时间异常温暖的海水，对全球海洋生态系统构成越来越大的威胁。虽然基于卫星的数据提供了对MHW模式的见解，但沿海上升流区域容易受到卫星偏差的影响，需要长期的原位数据集才能准确表征。利用分布在美国西海岸大陆架（离岸10-50公里）近2000公里海岸线上的22个表面浮标20年来的温度数据，我们首次调查了这一宝贵地区的mhw沿海分布模式。在2014-2016年的北太平洋MHW期间，MHW的空间范围从100%的浮标到区域事件期间的不到50%，再到单个浮标，突出了MHW尺度和驱动因素的广泛范围。无论是在春夏季上升流较少的季节时间尺度上，还是在天气时间尺度上，上升流的开始和结束分别与异常的弱和强上升流相关，上升流都是强流模式的重要贡献者。这在加利福尼亚中部和北部尤其明显，那里的上升流强度和变异性更强，区域共现率更低，而在加利福尼亚南部和俄勒冈州/华盛顿州，上升流更弱，区域共现率更高。此外，沿海地区的MHW指标几乎没有长期趋势，这表明该地区可能成为变暖海洋中的热避难所。有效管理和预测该地区沿海强飓风需要获取广泛的空间尺度和驱动因素，在许多情况下，具体地点的研究和/或高分辨率模型非常重要。

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引用次数: 0

Bioproductivity of the surface waters in the Guiana Basin (Atlantic ocean): new integrated approach 圭亚那盆地（大西洋）地表水的生物生产力：新的综合方法

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-08-16 DOI: 10.1016/j.csr.2025.105550

Svetlana Krasheninnikova , Alexander Sysoev , Alexander Demidov , Raisa Lee , Inna Sysoeva , Sergey Babich , Fedor Gippius

The purpose of this research to assess bioproductivity and trophicity of surface waters in the Guiana Basin to identify favorable conditions for the development of phytoplankton – a marker of the ocean ecosystem state. We use of data on phytoplankton (species and quantitative analysis) and biochemical parameters (concentrations of adenosine triphosphate and chlorophyll a) to determine the maturity stages and nutritional type of the communities using a new integrated approach. These data are obtained either from in situ measurements and sampling during a cruise in winter 2022, or satellite observations. An analysis of the phytoplankton distribution was carried out in conjunction with abiotic factors (temperature, salinity, dissolved oxygen, phosphate concentrations) for the photic layer 0–50 m. Generally, the main finding of our study is that in the Vema Fracture zone (mesotrophic waters) autotrophs prevail with the dominance of diatom microalgae (corresponding to equilibrium community); whereas in the Guiana section oligotrophic waters) heterotrophs prevail with the dominance of dinophytic microalgae (corresponding to developed and mature communities). This distribution is confirmed by the heterotrophic photoautotrophic index values (HPI). Concluding a discussion, we show that winter distribution of phytoplankton and the maturity degree of its community in the study area, are associated with the supply of nutrients due to the advection of Amazon waters by the North Brazil Current – North Equatorial Countercurrent system.

本研究的目的是评估圭亚那盆地地表水的生物生产力和营养，以确定浮游植物-海洋生态系统状态的标志-发育的有利条件。利用浮游植物（种类和定量分析）数据和生物化学参数（三磷酸腺苷和叶绿素a浓度），采用一种新的综合方法来确定群落的成熟阶段和营养类型。这些数据要么来自2022年冬季巡航期间的现场测量和采样，要么来自卫星观测。结合非生物因素（温度、盐度、溶解氧、磷酸盐浓度）对0-50 m光层的浮游植物分布进行了分析。总的来说，我们研究的主要发现是在Vema断裂带（中营养水域）自养生物占优势，硅藻微藻占主导地位（对应于平衡群落）；而在圭亚那部分低营养水域，异养生物普遍存在，以双藻微藻为主（对应于发达和成熟的群落）。异养光自养指数（HPI）证实了这种分布。结果表明，研究区浮游植物的冬季分布及其群落的成熟程度与北巴西流-北赤道逆流系统对亚马逊水的平流提供的营养物质有关。

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引用次数: 0

Silent survivors: diatom resilience in Mediterranean Temporary Ponds 沉默的幸存者：地中海临时池塘中的硅藻恢复力

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-08-13 DOI: 10.1016/j.csr.2025.105547

Davide Taurozzi , Massimiliano Scalici

Mediterranean Temporary Ponds (MTPs) are ephemeral freshwater habitats hosting a large number of aquatic and terrestrial organisms. Among these, diatoms represent the bioindicators that contribute mostly to Earth's global primary production. Herein, we focused our attention on the role of seasonality and hydroperiod on benthic diatoms of MTPs. We analyzed the diatom community turnover along one year in two MTPs in the Latium region, Italy. The two MTPs showed different levels of anthropogenic pressures. Our results demonstrated that hydroperiod length and seasonality showed a moderate influence on diatom richness of MTPs; in particular, although the highest number of species was found during spring, taxonomic diversity remained stable at seasonal and inter-annual level despite strong changes in community composition and hydroperiod length. Overall, sampling sites showed different ecological conditions and chemical drivers: protected site was dominated by species occurring in minimally impacted oligo- to mesotrophic waters; unprotected site with high EC and ORP was dominated by species occurring in euryhaline brackish waters. Moreover, physicochemical parameters showed a low influence on diatom assemblages in the protected site and a strong influence in the unprotected site. No significant correlation between diatom ecological guilds and physicochemical parameters emerged. While for all the seasons the dominant guild was the motile guild, no inter-season variations emerged: diatom communities and ecological guilds in MTPs are resilient to seasonal variations. To provide novel insights, future research should focus on additional environmental drivers such as nutrient availability, sediment composition, and hydrological variability, including long-term monitoring plans.

地中海临时池塘（mtp）是大量水生和陆生生物的短暂淡水栖息地。其中，硅藻代表了对地球全球初级生产贡献最大的生物指标。在此，我们重点研究了季节和水周期对mtp底栖硅藻的影响。我们分析了意大利Latium地区两个MTPs的硅藻群落一年的更替情况。两个MTPs表现出不同程度的人为压力。结果表明：水期长度和季节对mtp的硅藻丰富度有中等影响；尽管群落组成和水期长度发生了较大的变化，但分类学多样性在季节和年际水平上保持稳定。总体而言，各采样点呈现出不同的生态条件和化学驱动因素：受保护地点以受影响最小的中、寡营养水域的物种为主；高EC和ORP的未保护地点以全盐咸淡水中的物种为主。此外，物理化学参数对保护区内硅藻组合的影响较小，而对未保护区内硅藻组合的影响较大。硅藻生态行会与理化参数无显著相关。尽管在所有季节中，主导行会都是移动行会，但没有出现季节间的变化：mtp中的硅藻群落和生态行会对季节变化具有弹性。为了提供新的见解，未来的研究应关注其他环境驱动因素，如养分有效性、沉积物组成和水文变异性，包括长期监测计划。

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引用次数: 0