Continental Shelf Research最新文献_第2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

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

Jithendra Raju Nadimpalli , Mihir Kumar Dash , Ibrahim Hoteit

{"title":"On the interaction of mode-1 Internal Solitary Wave with higher modes to the west of northern Nicobar Islands","authors":"Jithendra Raju Nadimpalli , Mihir Kumar Dash , Ibrahim Hoteit","doi":"10.1016/j.csr.2025.105564","DOIUrl":"10.1016/j.csr.2025.105564","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"295 ","pages":"Article 105564"},"PeriodicalIF":2.2,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145049678","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

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

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

{"title":"Analysis of the uncertainties in tidal constants obtained from short tide gauge records and their value for tidal studies","authors":"M.S. Filmer , P.L. Woodworth , S.D.P. Williams , S.J. Claessens","doi":"10.1016/j.csr.2025.105565","DOIUrl":"10.1016/j.csr.2025.105565","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"295 ","pages":"Article 105565"},"PeriodicalIF":2.2,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145096249","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

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

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

{"title":"Shear instabilities in Internal Solitary Waves under high and low-wind regimes","authors":"Jorge M. Magalhaes , Martin J. Coubard , José C.B. da Silva , Maarten C. Buijsman , Ana Isabel Santos , Ana Amorim , Paulo B. Oliveira","doi":"10.1016/j.csr.2025.105561","DOIUrl":"10.1016/j.csr.2025.105561","url":null,"abstract":"<div><div>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 (<span><math><mrow><mi>R</mi><mi>i</mi><mo><</mo><mfrac><mn>1</mn><mn>4</mn></mfrac></mrow></math></span>) 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 <span><math><mrow><mi>R</mi><mi>i</mi><mo><</mo><mfrac><mn>1</mn><mn>4</mn></mfrac></mrow></math></span> 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.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"295 ","pages":"Article 105561"},"PeriodicalIF":2.2,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145027203","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

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

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

Jonathan Rogerson , Jennifer Veitch , Samantha Siedlecki , Sarah Fawcett

{"title":"Frontal features and mixing regimes along the shelf region of the Southern Benguela upwelling system","authors":"Jonathan Rogerson , Jennifer Veitch , Samantha Siedlecki , Sarah Fawcett","doi":"10.1016/j.csr.2025.105560","DOIUrl":"10.1016/j.csr.2025.105560","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"295 ","pages":"Article 105560"},"PeriodicalIF":2.2,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145096248","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

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

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

{"title":"Genetic differentiation in populations of two snappers, Lutjanus malabaricus and Pristipomoides multidens, in the Makassar Strait and adjacent waters, Indonesia: Implications for management","authors":"Tri Ernawati , Mennofatria Boer , Mohammad Mukhlis Kamal , Nurlisa Alias Butet , Fayakun Satria , Peter J. Mous","doi":"10.1016/j.csr.2025.105563","DOIUrl":"10.1016/j.csr.2025.105563","url":null,"abstract":"<div><div>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 (<em>Lutjanus malabaricus</em>) and the Goldband snapper (<em>Pristipomoides multidens</em>) 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 <em>L.malabaricus</em> and <em>P.multidens</em> 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 (<em>L.malabaricus</em>: <em>h</em> = 0.9284, <em>π</em> = 0.0434; <em>P.multidens</em>: <em>h</em> = 0.9766, <em>π</em> = 0.0532). Based on differences analysis to examine the population genetic structure showed different results. <em>L.malabaricus</em> was identified as having no population genetic structure. On the other hand, <em>P. multidens</em> has significant (<em>Φ</em><sub><em>ST</em></sub> = 0.07010, <em>p</em> < 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.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"295 ","pages":"Article 105563"},"PeriodicalIF":2.2,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144933128","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

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

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

{"title":"Potential human consumption risks from microplastics and non-synthetic microfibers in cultured oysters from a low-human-impact lagoon","authors":"Lucy Coral Alarcón-Ortega , Nancy Ramírez-Álvarez , Félix Augusto Hernández-Guzmán , Eduardo Antonio Lozano-Hernández","doi":"10.1016/j.csr.2025.105562","DOIUrl":"10.1016/j.csr.2025.105562","url":null,"abstract":"<div><div>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 (<em>Magallana gigas</em>) 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.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"295 ","pages":"Article 105562"},"PeriodicalIF":2.2,"publicationDate":"2025-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144997308","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

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

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

{"title":"Wave climate at Babitonga Bay using hybrid downscaling","authors":"Rodrigo Zanette , Marília S. Ramos , Mario Luiz Mascagni , Antonio H.F. Klein , Leandro Farina","doi":"10.1016/j.csr.2025.105551","DOIUrl":"10.1016/j.csr.2025.105551","url":null,"abstract":"<div><div>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 (<span><math><msub><mrow><mi>H</mi></mrow><mrow><mi>s</mi></mrow></msub></math></span>), peak period (<span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>p</mi></mrow></msub></math></span>), 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.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"295 ","pages":"Article 105551"},"PeriodicalIF":2.2,"publicationDate":"2025-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144903997","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

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

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

{"title":"Marine heatwaves detected by a network of buoys along the entire US West Coast Shelf","authors":"Gavin Plume , Ryan K. Walter , Piero L.F. Mazzini , Michael Dalsin","doi":"10.1016/j.csr.2025.105552","DOIUrl":"10.1016/j.csr.2025.105552","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"294 ","pages":"Article 105552"},"PeriodicalIF":2.2,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144892882","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

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

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

{"title":"Bioproductivity of the surface waters in the Guiana Basin (Atlantic ocean): new integrated approach","authors":"Svetlana Krasheninnikova , Alexander Sysoev , Alexander Demidov , Raisa Lee , Inna Sysoeva , Sergey Babich , Fedor Gippius","doi":"10.1016/j.csr.2025.105550","DOIUrl":"10.1016/j.csr.2025.105550","url":null,"abstract":"<div><div>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 <em>a</em>) 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.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"294 ","pages":"Article 105550"},"PeriodicalIF":2.2,"publicationDate":"2025-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144879794","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

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

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

Davide Taurozzi , Massimiliano Scalici

{"title":"Silent survivors: diatom resilience in Mediterranean Temporary Ponds","authors":"Davide Taurozzi , Massimiliano Scalici","doi":"10.1016/j.csr.2025.105547","DOIUrl":"10.1016/j.csr.2025.105547","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"294 ","pages":"Article 105547"},"PeriodicalIF":2.2,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144851866","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