Continental Shelf Research最新文献_第5页

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 : 2026-01-01 Epub 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。

{"title":"Ecosystem function: Trait diversity, bioturbation, and bio-irrigation potentials of macrobenthic invertebrate communities in the Red Sea","authors":"Seerangan Manokaran , Thadickal V. Joydas , Paravanparambil Rajakumar Jayachandran , Jayanath Gopi , Omer Reshi , Karuppasamy P. Manikandan , Mohamed A. Qurban","doi":"10.1016/j.csr.2025.105593","DOIUrl":"10.1016/j.csr.2025.105593","url":null,"abstract":"<div><div>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<sup>−2</sup>, 1.25 ± 0.26 g m<sup>−2</sup>, 1.70 ± 0.13 Fd’, 361 ± 57 ind. m<sup>−2</sup>, and 2.76 ± 0.11FH' (log<sup>2</sup>). 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 <em>(P < 0.05)</em> 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 <em>Aglaophamus dibranchis,</em> holothuria, sand dollar, and <em>Glycinde</em> sp.1 were responsible for higher BPc, and the taxa sand dollar, Spionidae indet. <em>Notomastus latericeus</em>, <em>Glycinde</em> sp.1, and <em>Prionospio</em> spp. contributed higher to IPc. The environmental variables MGS, silt/clay, depth, latitude (region), As, and Fe influenced functional density (<em>P = 0.191</em>) and biomass (<em>P = 0.182</em>), and MGS, depth, latitude, As, Mn, and Pb also influenced bioturbation (<em>P = 0.224</em>) and bio-irrigation (<em>P = 0.218</em>) 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.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"296 ","pages":"Article 105593"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145467271","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

Lithological and geochemical differentiations in an urbanized, shallow marine cold-seep environment. The case of Patras Gulf active pockmark field 城市化、浅海冷渗环境的岩性地球化学分异。以帕特拉斯湾为例

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2026-01-01 Epub Date: 2025-10-08 DOI: 10.1016/j.csr.2025.105583

Spyros Sergiou, Dimitra Ntrouva, Maria Geraga, Dimitris Christodoulou, George Papatheodorou

The Patras Gulf Pockmark Field (PGPF), located in a shallow, tectonically active marine basin in western Greece, offers a unique setting for studying lithological and geochemical variability in an urban-influenced cold-seep environment. Here we examine nine short sediment cores (∼30 cm) collected from both within pockmarks and the surrounding seafloor to assess sediment texture, elemental composition, and anthropogenic impacts. We find that pockmark sediments are finer-grained, better-sorted, less bioclastic, more organic-rich, and higher in trace metals loads compared to the surrounding seafloor. The sedimentary, geochemical, and hydrodynamic processes within the pockmarks follow the pockmark morphology; the larger the pockmark is, the more terrigenous, fine-grained, and metal-enriched the sediment is, and less oxygenation characterizes the bottom waters. Multivariate factor analysis identified five dominant geochemical processes. Factors 1 and 2, prevailing outside the pockmarks, reflect clay–metal sorption processes and the anticorrelation between bioclastic material and fine-grained terrigenous inputs. Within pockmarks, Factor 3 indicates anthropogenic sources of Ag, Hg, and Zn through organic carbon–metal sequestration, especially in the southern sector of PGPF, influenced by Glafkos River discharges. Factor 4 reflects localized contamination by Zr, Ta, and Nb, while Factor 5 captures sulfidic, low-oxygen conditions linked to redox dynamics. Despite documented fluid escape activity, no clear imprints of active seepage were observed in the studied pockmark sediments. These findings emphasize the dual control of geomorphology and anthropogenic forcing on geochemical processes in shallow marine cold-seep environments, with implications for trace metal mobility, sediment trapping efficiency, and environmental monitoring in similar settings.

Patras Gulf Pockmark Field （PGPF）位于希腊西部一个浅层、构造活跃的海相盆地，为研究城市影响的冷渗环境中的岩性和地球化学变化提供了独特的环境。在这里，我们研究了从麻坑和周围海底收集的9个短沉积物岩心（~ 30厘米），以评估沉积物的质地、元素组成和人为影响。我们发现，与周围的海底相比，麻子沉积物颗粒更细，分选更好，生物碎屑更少，有机物含量更高，微量金属含量更高。麻坑内的沉积、地球化学和水动力过程遵循麻坑的形态；麻坑越大，沉积物的陆源性越强，颗粒越细，金属含量越高，底部水体的氧合作用越少。多因素分析确定了5个主要的地球化学过程。因子1和因子2在麻坑外普遍存在，反映了粘土-金属的吸附过程以及生物碎屑物质与细粒陆源输入物之间的反相关性。在麻坑内，因子3表明银、汞和锌的人为来源是通过有机碳金属固存，特别是在PGPF南段，受Glafkos河排放的影响。因子4反映了Zr、Ta和Nb的局部污染，而因子5捕获了与氧化还原动力学相关的硫化物、低氧条件。尽管记录了流体逸出活动，但在研究的麻坑沉积物中没有观察到明显的活动渗流痕迹。这些发现强调了在浅海冷渗环境中，地貌和人为强迫对地球化学过程的双重控制，对类似环境下的微量金属流动性、沉积物捕获效率和环境监测具有重要意义。

{"title":"Lithological and geochemical differentiations in an urbanized, shallow marine cold-seep environment. The case of Patras Gulf active pockmark field","authors":"Spyros Sergiou, Dimitra Ntrouva, Maria Geraga, Dimitris Christodoulou, George Papatheodorou","doi":"10.1016/j.csr.2025.105583","DOIUrl":"10.1016/j.csr.2025.105583","url":null,"abstract":"<div><div>The Patras Gulf Pockmark Field (PGPF), located in a shallow, tectonically active marine basin in western Greece, offers a unique setting for studying lithological and geochemical variability in an urban-influenced cold-seep environment. Here we examine nine short sediment cores (∼30 cm) collected from both within pockmarks and the surrounding seafloor to assess sediment texture, elemental composition, and anthropogenic impacts. We find that pockmark sediments are finer-grained, better-sorted, less bioclastic, more organic-rich, and higher in trace metals loads compared to the surrounding seafloor. The sedimentary, geochemical, and hydrodynamic processes within the pockmarks follow the pockmark morphology; the larger the pockmark is, the more terrigenous, fine-grained, and metal-enriched the sediment is, and less oxygenation characterizes the bottom waters. Multivariate factor analysis identified five dominant geochemical processes. Factors 1 and 2, prevailing outside the pockmarks, reflect clay–metal sorption processes and the anticorrelation between bioclastic material and fine-grained terrigenous inputs. Within pockmarks, Factor 3 indicates anthropogenic sources of Ag, Hg, and Zn through organic carbon–metal sequestration, especially in the southern sector of PGPF, influenced by Glafkos River discharges. Factor 4 reflects localized contamination by Zr, Ta, and Nb, while Factor 5 captures sulfidic, low-oxygen conditions linked to redox dynamics. Despite documented fluid escape activity, no clear imprints of active seepage were observed in the studied pockmark sediments. These findings emphasize the dual control of geomorphology and anthropogenic forcing on geochemical processes in shallow marine cold-seep environments, with implications for trace metal mobility, sediment trapping efficiency, and environmental monitoring in similar settings.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"296 ","pages":"Article 105583"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145247906","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

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 : 2026-01-01 Epub 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。

{"title":"Early Pleistocene fossil seagrass assemblages on Rhodes Island – a proof of allochthonous origin","authors":"Katarína Holcová , Martina Havelcová , Sanah Shaikh , Markéta Chroustová , Katarína Šarinová , Filip Scheiner , Petr Kraft , Ivana Sýkorová , Rastislav Milovský","doi":"10.1016/j.csr.2025.105594","DOIUrl":"10.1016/j.csr.2025.105594","url":null,"abstract":"<div><div>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 δ<sup>13</sup>C<sub>org</sub> 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 <em>Posidonia</em> leaves were transported within the estuary rather than deposited <em>in situ</em>. Organic geochemical analyses revealed minor peaks of submerged plant-specific <em>n</em>-alkanes (C<sub>21</sub>, C<sub>23</sub>, C<sub>25</sub>) similar to modern dead <em>Posidonia</em> accumulations. Abundant short even <em>n</em>-alkanes (C<sub>16</sub>, C<sub>18</sub>) associated with heterotrophic bacteria and fungi are also present, indicating microbial decomposition. Identical geochemical signatures in samples without <em>Posidonia</em> 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.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"296 ","pages":"Article 105594"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145418562","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

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 : 2026-01-01 Epub 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。

{"title":"Elevated meroplankton abundance in surface slicks during internal wave forcing at three coastal sites in Mexico","authors":"Lydia B. Ladah , Andrea Lievana Mactavish , María del Refugio Barba López , James J. Leichter , Fabian J. Tapia , Anatoliy Filonov","doi":"10.1016/j.csr.2025.105599","DOIUrl":"10.1016/j.csr.2025.105599","url":null,"abstract":"<div><div>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<sup>−1</sup>) 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.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"296 ","pages":"Article 105599"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145418561","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

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 : 2026-01-01 Epub 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

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 : 2026-01-01 Epub 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。

{"title":"Tidal and wind-driven spatiotemporal variability in the residual displacement and dispersion of Lagrangian particles in a system of intertidal basins","authors":"Jeancarlo M. Fajardo-Urbina , Ulf Gräwe , Herman J.H. Clercx , Theo Gerkema , Matias Duran-Matute","doi":"10.1016/j.csr.2025.105602","DOIUrl":"10.1016/j.csr.2025.105602","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"296 ","pages":"Article 105602"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145520172","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

Carbon stocks on the intertidal seagrass meadow of the Indonesian Islands: Spatial and anthropogenic activities variability 印度尼西亚群岛潮间带海草草甸的碳储量：空间和人为活动变率

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2026-01-01 Epub Date: 2025-11-07 DOI: 10.1016/j.csr.2025.105604

Fery Kurniawan , Agustin Rustam , Robba Fahrisy Darus , Fauziyah , Almira Nadia Kusuma , Muhammad Noval Alghifari , Luky Adrianto , Yonvitner

Human activities significantly influence carbon sequestration and carbon stock in seagrass ecosystems; however, their impacts on small islands remain understudied. Based on this gap, this study quantified seagrass carbon stocks across Indonesian islands, examining spatial variability and anthropogenic pressures. Carbon stocks were measured using the Loss on Ignition (LOI) method. Results showed relatively high values, with biomass ranging from 0.65 to 11.25 tC ha⁻¹ (4.01 ± 2.84 tC ha⁻¹), sediment from 22.46 to 98.53 tC ha⁻¹ (52.77 ± 17.61 tC ha⁻¹), and total carbon from 22.70 to 98.53 tC ha⁻¹ (56.78 ± 20.45 tC ha⁻¹). Significant spatial differences were observed among islands and land-use categories, indicating that average or constant values cannot be reliably applied for national carbon estimates. Anthropogenic activities also had a marked effect, underscoring the need to integrate human impacts into management and conservation strategies. These findings provide essential baseline data for national carbon accounting while highlighting the ecological and climate importance of small-island seagrass ecosystems. Protecting and restoring seagrass meadows should be prioritized as a dual strategy for climate adaptation and biodiversity conservation.

人类活动显著影响海草生态系统的固碳和碳储量；然而，它们对小岛屿的影响仍未得到充分研究。基于这一差距，本研究量化了印度尼西亚岛屿的海草碳储量，考察了空间变异性和人为压力。碳储量的测定采用着火损失法（LOI）。结果表明，群落生物量为0.65 ~ 11.25 tC ha−1(4.01±2.84 tC ha−1)，沉积物为22.46 ~ 98.53 tC ha−1(52.77±17.61 tC ha−1)，总碳为22.70 ~ 98.53 tC ha−1（56.78±20.45 tC ha−1）。岛屿和土地利用类别之间存在显著的空间差异，表明平均值或常数值不能可靠地用于国家碳估算。人为活动也有显著的影响，强调需要将人类的影响纳入管理和保护战略。这些发现为国家碳核算提供了基本的基线数据，同时突出了小岛屿海草生态系统在生态和气候方面的重要性。应将保护和恢复海草草甸作为适应气候变化和保护生物多样性的双重战略。

{"title":"Carbon stocks on the intertidal seagrass meadow of the Indonesian Islands: Spatial and anthropogenic activities variability","authors":"Fery Kurniawan , Agustin Rustam , Robba Fahrisy Darus , Fauziyah , Almira Nadia Kusuma , Muhammad Noval Alghifari , Luky Adrianto , Yonvitner","doi":"10.1016/j.csr.2025.105604","DOIUrl":"10.1016/j.csr.2025.105604","url":null,"abstract":"<div><div>Human activities significantly influence carbon sequestration and carbon stock in seagrass ecosystems; however, their impacts on small islands remain understudied. Based on this gap, this study quantified seagrass carbon stocks across Indonesian islands, examining spatial variability and anthropogenic pressures. Carbon stocks were measured using the Loss on Ignition (LOI) method. Results showed relatively high values, with biomass ranging from 0.65 to 11.25 tC ha<sup>−1</sup> (4.01 ± 2.84 tC ha<sup>−1</sup>), sediment from 22.46 to 98.53 tC ha<sup>−1</sup> (52.77 ± 17.61 tC ha<sup>−1</sup>), and total carbon from 22.70 to 98.53 tC ha<sup>−1</sup> (56.78 ± 20.45 tC ha<sup>−1</sup>). Significant spatial differences were observed among islands and land-use categories, indicating that average or constant values cannot be reliably applied for national carbon estimates. Anthropogenic activities also had a marked effect, underscoring the need to integrate human impacts into management and conservation strategies. These findings provide essential baseline data for national carbon accounting while highlighting the ecological and climate importance of small-island seagrass ecosystems. Protecting and restoring seagrass meadows should be prioritized as a dual strategy for climate adaptation and biodiversity conservation.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"296 ","pages":"Article 105604"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145520170","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

Assessing the potential of consumer-grade fish finders to improve coastal habitat mapping in data-poor areas 评估消费级捕鱼器在数据贫乏地区改善沿海生境测绘的潜力

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2026-01-01 Epub Date: 2025-10-11 DOI: 10.1016/j.csr.2025.105590

Pedro T. Gomes , Renato Henriques , Marcos Rubal , Diana Azevedo , Diego Carreira-Flores

Geospatial information is fundamental for understanding marine biodiversity patterns, species distribution, and environmental change. However, traditional methods for obtaining high-resolution bathymetric data are expensive and time-consuming, limiting data availability and creating significant gaps, particularly in coastal zones. This study explores the potential of consumer-grade sonars (fish finders) as cost-effective tools to improve bathymetric maps and support habitat mapping along a coastal area in northern Portugal. We compared bathymetric data collected by consumer-grade devices with publicly available digital elevation models (DEM) from EMODNET and high-resolution, survey-grade multibeam sonar data from the APA COSMO project. Results revealed strong agreement between consumer-grade sonar data and EMODNET DEM, with substantial improvement in local detail and acceptable errors (RMSE and MAE low; Pearson correlation coefficients from 0.957 to 0.963). Comparisons with COSMO DEM also showed good coherence, highlighting a significant increase in detail proportional to sampling density, though still lacking the fine resolution provided by the professional-grade COSMO dataset. Despite inherent limitations in precision and depth range, consumer-grade sonars proved highly valuable, offering practical solutions for low-resource, small-scale projects, environmental monitoring, and ecological habitat mapping. This study supports integrating these affordable devices into marine research workflows, significantly enhancing bathymetric data availability and spatial resolution, especially where detailed professional data are unavailable or economically unfeasible.

地理空间信息是了解海洋生物多样性格局、物种分布和环境变化的基础。然而，获取高分辨率水深数据的传统方法既昂贵又耗时，限制了数据的可用性，并造成了巨大的缺口，特别是在沿海地区。本研究探索了消费级声纳（寻鱼器）作为经济有效的工具的潜力，以改善深度地图和支持沿葡萄牙北部沿海地区的栖息地测绘。我们将消费级设备收集的测深数据与EMODNET的公开数字高程模型（DEM）和APA COSMO项目的高分辨率测量级多波束声纳数据进行了比较。结果显示，消费级声纳数据与EMODNET DEM之间的一致性很强，在局部细节和可接受误差（RMSE和MAE较低；Pearson相关系数从0.957到0.963）方面有很大改善。与COSMO DEM的对比也显示出良好的一致性，显示出与采样密度成正比的细节显著增加，尽管仍然缺乏专业级COSMO数据集提供的精细分辨率。尽管精度和深度范围存在固有的局限性，但消费级声纳被证明是非常有价值的，为低资源、小规模项目、环境监测和生态栖息地测绘提供了实用的解决方案。该研究支持将这些经济实惠的设备集成到海洋研究工作流程中，显著提高了水深数据的可用性和空间分辨率，特别是在没有详细的专业数据或经济上不可行的情况下。

{"title":"Assessing the potential of consumer-grade fish finders to improve coastal habitat mapping in data-poor areas","authors":"Pedro T. Gomes , Renato Henriques , Marcos Rubal , Diana Azevedo , Diego Carreira-Flores","doi":"10.1016/j.csr.2025.105590","DOIUrl":"10.1016/j.csr.2025.105590","url":null,"abstract":"<div><div>Geospatial information is fundamental for understanding marine biodiversity patterns, species distribution, and environmental change. However, traditional methods for obtaining high-resolution bathymetric data are expensive and time-consuming, limiting data availability and creating significant gaps, particularly in coastal zones. This study explores the potential of consumer-grade sonars (fish finders) as cost-effective tools to improve bathymetric maps and support habitat mapping along a coastal area in northern Portugal. We compared bathymetric data collected by consumer-grade devices with publicly available digital elevation models (DEM) from EMODNET and high-resolution, survey-grade multibeam sonar data from the APA COSMO project. Results revealed strong agreement between consumer-grade sonar data and EMODNET DEM, with substantial improvement in local detail and acceptable errors (RMSE and MAE low; Pearson correlation coefficients from 0.957 to 0.963). Comparisons with COSMO DEM also showed good coherence, highlighting a significant increase in detail proportional to sampling density, though still lacking the fine resolution provided by the professional-grade COSMO dataset. Despite inherent limitations in precision and depth range, consumer-grade sonars proved highly valuable, offering practical solutions for low-resource, small-scale projects, environmental monitoring, and ecological habitat mapping. This study supports integrating these affordable devices into marine research workflows, significantly enhancing bathymetric data availability and spatial resolution, especially where detailed professional data are unavailable or economically unfeasible.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"296 ","pages":"Article 105590"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145326452","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

Across-shelf scale-selective separation of a quasi-geostrophic current and internal gravity waves off southeastern Hokkaido, Japan 日本北海道东南部准地转流和内部重力波的跨陆架尺度选择性分离

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2026-01-01 Epub Date: 2025-11-11 DOI: 10.1016/j.csr.2025.105606

Tatsuro Karaki , Yukiko Taniuchi, Hiromi Kasai, Hiroshi Kuroda

Interactions between oceanic mesoscale currents and inertia-gravity waves (IGWs) are thought to facilitate the energy transition toward submesoscale regimes. Such mesoscale–submesoscale transition processes involve unbalanced motions, such as the IGWs, making it difficult to distinguish between them in observational data. Using across-shelf scale-selective filters, we separated the IGWs from a quasi-geostrophic (QG) current, the Coastal Oyashio (CO), based on a CTD-measured hydrographic section with ∼2-km resolution across the Pacific shelf off southeast Hokkaido, Japan, and clarified the mesoscale–submesoscale transition processes in this IGW–QG coupled system. To determine the optimum smoothing scale

{Δ Y}_{o}

, we formulated indices based on non-dimensional numbers such as the Rossby number

R_{o}

and the Richardson number

R_{i}

, calculated from the CTD-derived along-shelf baroclinic velocity. Applying a low-pass filter with

{Δ Y}_{o}

to the in-situ density section, where

R_{o}

and

R_{i}^{- 1}

were of magnitude O(1), resulted in a smoothed section where both

R_{o}

and

R_{i}^{- 1}

were reduced to ∼O(0.1), with

R_{o} \approx R_{i}^{- 1}

. The smoothed isopycnals were sloped over the Rossby radius of deformation

L_{d}

, consistent with the geostrophic adjustment theory. More quantitatively, the diagnosis yielded an optimal smoothing scale of

{Δ Y}_{o}

= 6 km. The IGWs propagating along the subsurface pycnocline, characterized by

L_{d} \approx

1 km (i.e., a wavelength around 6 km,

2 π L_{d}

), were successfully separated from the baroclinic jet structure of the CO, which had

L_{d} \approx

10 km. As a result, our observations revealed a hybrid of symmetric and gravitational instability associated with IGW-breaking near the core of the CO baroclinic jet.

海洋中尺度流和惯性重力波（igw）之间的相互作用被认为促进了向亚中尺度状态的能量转换。这种中尺度-亚中尺度过渡过程涉及不平衡运动，例如igw，因此很难在观测资料中区分它们。利用跨大陆架尺度选择过滤器，基于日本北海道东南部太平洋大陆架的ctd测量的~ 2 km分辨率的水文剖面，我们将igw从准地转流（QG）中分离出来，并阐明了IGW-QG耦合系统中的中尺度-亚中尺度过渡过程。为了确定最佳平滑尺度ΔYo，我们根据沿大陆架斜压速度导出的ctd计算得到的rosby数Ro和Richardson数Ri等无因次数制定了指标。在Ro和Ri−1量级为O(1)的原位密度剖面上应用ΔYo低通滤波器，得到了一个Ro和Ri−1都降至~ O（0.1）的光滑剖面，其中Ro≈Ri−1。平滑的等斜线在Rossby变形半径Ld上倾斜，符合地转平差理论。更定量地说，诊断得出的最佳平滑尺度为ΔYo = 6 km。沿地下斜斜方向传播的igw，其特征为Ld≈1 km（即波长约6 km， 2πLd），成功地从Ld≈10 km的CO斜压射流结构中分离出来。结果，我们的观测揭示了一种对称和引力不稳定的混合，这种不稳定与CO斜压射流核心附近的igw破裂有关。

{"title":"Across-shelf scale-selective separation of a quasi-geostrophic current and internal gravity waves off southeastern Hokkaido, Japan","authors":"Tatsuro Karaki , Yukiko Taniuchi, Hiromi Kasai, Hiroshi Kuroda","doi":"10.1016/j.csr.2025.105606","DOIUrl":"10.1016/j.csr.2025.105606","url":null,"abstract":"<div><div>Interactions between oceanic mesoscale currents and inertia-gravity waves (IGWs) are thought to facilitate the energy transition toward submesoscale regimes. Such mesoscale–submesoscale transition processes involve unbalanced motions, such as the IGWs, making it difficult to distinguish between them in observational data. Using across-shelf scale-selective filters, we separated the IGWs from a quasi-geostrophic (QG) current, the Coastal Oyashio (CO), based on a CTD-measured hydrographic section with ∼2-km resolution across the Pacific shelf off southeast Hokkaido, Japan, and clarified the mesoscale–submesoscale transition processes in this IGW–QG coupled system. To determine the optimum smoothing scale <span><math><mrow><msub><mrow><mo>Δ</mo><mi>Y</mi></mrow><mi>o</mi></msub></mrow></math></span>, we formulated indices based on non-dimensional numbers such as the Rossby number <span><math><mrow><msub><mi>R</mi><mi>o</mi></msub></mrow></math></span> and the Richardson number <span><math><mrow><msub><mi>R</mi><mi>i</mi></msub></mrow></math></span>, calculated from the CTD-derived along-shelf baroclinic velocity. Applying a low-pass filter with <span><math><mrow><msub><mrow><mo>Δ</mo><mi>Y</mi></mrow><mi>o</mi></msub></mrow></math></span> to the in-situ density section, where <span><math><mrow><msub><mi>R</mi><mi>o</mi></msub></mrow></math></span> and <span><math><mrow><msubsup><mrow><mspace></mspace><mi>R</mi></mrow><mi>i</mi><mrow><mo>−</mo><mn>1</mn></mrow></msubsup></mrow></math></span> were of magnitude <em>O</em>(1), resulted in a smoothed section where both <span><math><mrow><msub><mi>R</mi><mi>o</mi></msub></mrow></math></span> and <span><math><mrow><msubsup><mi>R</mi><mi>i</mi><mrow><mo>−</mo><mn>1</mn></mrow></msubsup></mrow></math></span> were reduced to ∼<em>O</em>(0.1), with <span><math><mrow><msub><mi>R</mi><mi>o</mi></msub><mo>≈</mo><msubsup><mi>R</mi><mi>i</mi><mrow><mo>−</mo><mn>1</mn></mrow></msubsup></mrow></math></span>. The smoothed isopycnals were sloped over the Rossby radius of deformation <span><math><mrow><msub><mi>L</mi><mi>d</mi></msub></mrow></math></span>, consistent with the geostrophic adjustment theory. More quantitatively, the diagnosis yielded an optimal smoothing scale of <span><math><mrow><msub><mrow><mo>Δ</mo><mi>Y</mi></mrow><mi>o</mi></msub></mrow></math></span> = 6 km. The IGWs propagating along the subsurface pycnocline, characterized by <span><math><mrow><msub><mi>L</mi><mi>d</mi></msub><mo>≈</mo></mrow></math></span> 1 km (i.e., a wavelength around 6 km, <span><math><mrow><mn>2</mn><mi>π</mi><msub><mi>L</mi><mi>d</mi></msub></mrow></math></span>), were successfully separated from the baroclinic jet structure of the CO, which had <span><math><mrow><msub><mi>L</mi><mi>d</mi></msub><mo>≈</mo></mrow></math></span> 10 km. As a result, our observations revealed a hybrid of symmetric and gravitational instability associated with IGW-breaking near the core of the CO baroclinic jet.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"296 ","pages":"Article 105606"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145520169","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

Impacts of stratified water column on summer phytoplankton community structure and dynamics in the East Sea, Korea 分层水柱对东海夏季浮游植物群落结构和动态的影响

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2026-01-01 Epub Date: 2025-10-20 DOI: 10.1016/j.csr.2025.105592

Bora Lee , Chung Hyeon Lee , Yun-Bae Kim , Chang Hwan Kim , Chan Hong Park , Seung Ho Baek

Summer stratification strongly regulates nutrient availability and phytoplankton productivity in the East Sea. We examined the combined influences of the East Korea Warm Current (EKWC) and stratification intensity on phytoplankton communities in the Ulleung Basin during four consecutive summers (2021–2024). Years of weak EKWC transport (2021, 2023; 0.1–0.3 m s⁻¹) coincided with restricted offshore dispersal of coastal production and lower surface chlorophyll a (Chl. a; mean 0.34 μg L⁻¹). In contrast, strong EKWC years (2022, 2024; 0.5–0.8 m s⁻¹) exhibited enhanced offshore dispersion and higher Chl. a (mean 0.79 μg L⁻¹). Intensified stratification produced sharp vertical gradients in temperature (24–29 °C at 0–30 m vs. 6–13 °C at 50–100 m), salinity (31.8–32.6 vs. 33.9–34.2), and nitrate (≤5 vs. 6–12 μM), and supported the formation of subsurface chlorophyll maxima (SCM) at 13–47 m, where light and residual nutrients intersected. Community composition displayed strong vertical partitioning: pico-phytoplankton dominated nutrient-depleted surface layers (mean 61 % of biomass), while diatoms prevailed in SCM layers (38–70 %). Dinoflagellates, including Katodinium glaucum and Gyrodinium spp., increased under stratified conditions, and cryptophytes became more abundant at depth. Overall, these results demonstrate that EKWC variability controls horizontal transport of phytoplankton biomass, while stratification governs vertical zonation and taxonomic composition. As sea surface warming intensifies summer stratification, these findings provide critical baseline data for ecosystem models predicting future shifts in nutrient cycling, productivity, and food web dynamics in the East Sea.

夏季分层对东海营养物有效性和浮游植物生产力具有重要的调节作用。研究了2021-2024年连续4个夏季，东朝鲜暖流（EKWC）和分层强度对郁陵盆地浮游植物群落的综合影响。弱EKWC输运年份（2021年，2023年；0.1-0.3 m s−1）与沿海植物在近海的有限扩散和较低的地表叶绿素a （Chl）相吻合。一个;平均0.34 μg L−1)。相比之下，强EKWC年份（2022年，2024年；0.5-0.8 m s−1）表现出增强的离岸色散和更高的Chl。a（平均0.79 μg L−1）。强化的分层作用在温度（0-30 m处24-29°C vs. 50-100 m处6-13°C）、盐度（31.8-32.6 vs. 33.9-34.2）和硝酸盐（≤5 vs. 6-12 μM）上产生了明显的垂直梯度，并支持了13-47 m处地表下叶绿素最大值（SCM）的形成，这是光和残留营养物质相交的地方。群落组成表现出较强的垂直分异：微浮游植物在营养枯竭的表层占主导地位（平均占生物量的61%），硅藻在SCM层占主导地位（38 - 70%）。甲藻（包括Katodinium glaucum和Gyrodinium spp）在分层条件下增加，隐生植物在深层变得更加丰富。总体而言，这些结果表明，EKWC变异控制浮游植物生物量的水平运输，而分层控制垂直带和分类组成。随着海面变暖加剧夏季分层，这些发现为预测东海养分循环、生产力和食物网动态的未来变化的生态系统模型提供了关键的基线数据。

{"title":"Impacts of stratified water column on summer phytoplankton community structure and dynamics in the East Sea, Korea","authors":"Bora Lee , Chung Hyeon Lee , Yun-Bae Kim , Chang Hwan Kim , Chan Hong Park , Seung Ho Baek","doi":"10.1016/j.csr.2025.105592","DOIUrl":"10.1016/j.csr.2025.105592","url":null,"abstract":"<div><div>Summer stratification strongly regulates nutrient availability and phytoplankton productivity in the East Sea. We examined the combined influences of the East Korea Warm Current (EKWC) and stratification intensity on phytoplankton communities in the Ulleung Basin during four consecutive summers (2021–2024). Years of weak EKWC transport (2021, 2023; 0.1–0.3 m s<sup>−1</sup>) coincided with restricted offshore dispersal of coastal production and lower surface chlorophyll <em>a</em> (Chl. <em>a</em>; mean 0.34 μg L<sup>−1</sup>). In contrast, strong EKWC years (2022, 2024; 0.5–0.8 m s<sup>−1</sup>) exhibited enhanced offshore dispersion and higher Chl. <em>a</em> (mean 0.79 μg L<sup>−1</sup>). Intensified stratification produced sharp vertical gradients in temperature (24–29 °C at 0–30 m vs. 6–13 °C at 50–100 m), salinity (31.8–32.6 vs. 33.9–34.2), and nitrate (≤5 vs. 6–12 μM), and supported the formation of subsurface chlorophyll maxima (SCM) at 13–47 m, where light and residual nutrients intersected. Community composition displayed strong vertical partitioning: pico-phytoplankton dominated nutrient-depleted surface layers (mean 61 % of biomass), while diatoms prevailed in SCM layers (38–70 %). Dinoflagellates, including <em>Katodinium glaucum</em> and <em>Gyrodinium</em> spp., increased under stratified conditions, and cryptophytes became more abundant at depth. Overall, these results demonstrate that EKWC variability controls horizontal transport of phytoplankton biomass, while stratification governs vertical zonation and taxonomic composition. As sea surface warming intensifies summer stratification, these findings provide critical baseline data for ecosystem models predicting future shifts in nutrient cycling, productivity, and food web dynamics in the East Sea.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"296 ","pages":"Article 105592"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145364471","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