Continental Shelf Research最新文献_第5页

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 : 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。

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引用次数: 0

Responses of zooplankton (copepods) in the Indian mud bank-upwelling region 印度泥滩上升流区浮游动物（桡足类）的响应

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-10-10 DOI: 10.1016/j.csr.2025.105576

S. Parthasarathi , R. Jyothibabu , V. Vidhya , L. Jagadeesan , N. Arunpandi , Unnimaya

In 2014 and 2016, the ecology and composition of zooplankton in the Alappuzha mud bank-upwelling area along the southwest (Kerala) coast of India were studied using biweekly sampling from the Pre-Monsoon (PRM) in April to the late Southwest Monsoon (SWM) in September. The zooplankton community was composed of 17 taxa, with copepods accounting for over 70 % of the total abundance. The biomass and abundance increased during both the SWMs of 2014 and 2016, primarily due to an enhancement in phytoplankton caused by nutrient enrichment associated with coastal upwelling. Nonetheless, the 2016 SWM had more suspended sediments and a longer and more severe oxygen deficiency than the 2014 SWM, resulting in lower zooplankton biomass and abundance. Polychaete larvae and gelatinous zooplankton (siphonophores and appendicularians) were also more abundant during the 2016 SWM because of their adaptations to utilise the abundant food while oxygen levels are low. During the PRM, copepods largely consisted of omnivores that effectively used resources in the microbial food web, such as Centropages orsini, C. furcatus, Acartia danae, and A. erythraea. In contrast, the SWM was dominated by copepods such as Temora turbinata, Pseudodiaptomus serricaudatus, and Oithona similis. Due to its ability to survive in low-oxygen settings, O. similis was significantly more prevalent throughout the SWM in both years. Temora turbinata, an indicator species of upwelling, showed higher dominance in the 2016 SWM when oxygen deficiency was more intense and prolonged. Overall, the zooplankton community exhibited the following characteristics: (a) a temporal shift in composition and abundance, (b) dominance of copepods with a preference for the microbial food web during the PRM and hypoxia-adapted ones during the SWM, and (c) a decrease in overall abundance during the 2016 SWM, indicating the negative effects of oxygen deficiency and increased turbidity. Thus, this study establishes a baseline for comparing how zooplankton (copepods) react to different oxygen and turbidity levels in a coastal upwelling mud bank system during alternate SWMs.

2014年和2016年，利用4月季风前（PRM）至9月西南季风后期（SWM）的双周采样，对印度西南（喀拉拉邦）海岸Alappuzha泥滩上升流区浮游动物生态和组成进行了研究。浮游动物群落由17个类群组成，桡足类占总丰度的70%以上。在2014年和2016年的两个SWMs期间，生物量和丰度都有所增加，这主要是由于与沿海上升流相关的营养物富集导致浮游植物的增加。尽管如此，与2014年的SWM相比，2016年SWM的悬浮沉积物更多，缺氧时间更长，缺氧程度更严重，导致浮游动物生物量和丰度降低。在2016年的SWM期间，多毛类幼虫和胶状浮游动物（虹吸管和尾虫）的数量也更多，因为它们适应了在氧气水平较低的情况下利用丰富的食物。在PRM期间，桡足类主要由杂食动物组成，这些杂食动物有效地利用了微生物食物网中的资源，如Centropages orsini、C. furcatus、Acartia danae和A. erythraea。与此相反，SWM以Temora turbinata、Pseudodiaptomus serricaudatus和Oithona similis等桡足类为主。由于其在低氧环境下生存的能力，在这两年中，在整个SWM中，O. similis明显更为普遍。上升流指示种turbinata在2016年SWM中表现出更高的优势度，缺氧程度越高，持续时间越长。总体而言，浮游动物群落表现出以下特征：(a)组成和丰度的时间变化，(b)在PRM期间以微生物食物网为主的桡足类占优势，在SWM期间以低氧适应的桡足类为主，以及(c) 2016年SWM期间总体丰度下降，表明缺氧和浊度增加的负面影响。因此，本研究建立了一个基线，用于比较在交替的SWMs期间，沿海上升流泥滩系统中浮游动物（桡足类）对不同氧气和浊度水平的反应。

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引用次数: 0

Detection and temporal variation of the thermal front system in the Midriff Archipelago Region of the Gulf of California 加利福尼亚湾米德里夫群岛地区热锋系统的探测和时间变化

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-10-08 DOI: 10.1016/j.csr.2025.105581

Amelia Sánchez-Pérez , Leonardo Tenorio-Fernández , Emmanuel Romero , Jorge Montes-Aréchiga , Laura Sánchez-Velasco

Based on 20 years of remote-sensing sea surface temperature (SST) data (2004–2023), the temporal persistence of thermal fronts in the Midriff Archipelago Region (MAR), was analyzed. Using the Front Probability Index and wavelet analysis, six main areas of thermal front formation were identified, along with their oscillation periods. The potential relationship between wind and the formation of thermal fronts was also examined using squared wavelet coherence analysis. The thermal front system exhibited significant seasonal variations in terms of formation, location, and intensity. Most intense fronts were formed in specific areas near both coasts, particularly during spring and summer. Most of the year, fronts in five of the six front-forming areas studied were oriented parallel to the axis of the Gulf of California, while in the remaining area they were predominantly transverse to the Gulf of California axis, mainly during winter. The primary periods of variation for thermal fronts were identified as annual and semiannual. This seasonal pattern ensures the constant presence of fronts in the MAR, highlighting the complexity and dynamics of the system. The formation of fronts is attributed to the interaction of various favorable conditions. The results revealed a high coherence between winds and SST gradients. Southerly winds, which prevail during spring and summer, enhanced the formation and distribution of thermal fronts in the western region while reducing them in the east, whereas northerly winds, dominant in fall and winter, had the opposite effect, reducing fronts in the west and intensifying them in the east. Consequently, this study provides a robust foundation for understanding the temporal and spatial variability of thermal front formation in the MAR, serving as a basis for future research on their potential and their impacts on local marine ecosystems.

利用2004-2023年20 a海表温度（SST）数据，分析了米德里夫群岛地区（MAR）热锋的时间持续性。利用锋面概率指数和小波分析，确定了热锋形成的6个主要区域及其振荡周期。利用平方小波相干分析分析了风与热锋形成的潜在关系。热锋系统在形成、位置和强度上均表现出明显的季节变化。最强烈的锋面形成于靠近两岸的特定区域，特别是在春季和夏季。在研究的6个锋面形成区中，有5个锋面在一年的大部分时间里平行于加利福尼亚湾轴线，而在其余地区，锋面主要在冬季横向于加利福尼亚湾轴线。热锋的主要变化周期为一年一次和半年一次。这种季节性模式确保了MAR中锋面的持续存在，突出了系统的复杂性和动态性。锋面的形成是各种有利条件相互作用的结果。结果表明，风和海温梯度之间具有高度的一致性。春夏季盛行的南风增强了西部热锋的形成和分布，东部热锋减弱，秋冬季盛行的北风则相反，西部热锋减弱，东部热锋增强。因此，本研究为了解MAR热锋形成的时空变异性提供了坚实的基础，为进一步研究其潜力及其对当地海洋生态系统的影响奠定了基础。

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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 : 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。

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引用次数: 0

Anomalously warm conditions decrease microphytoplankton abundance in Alfonso Basin, Southwest Gulf of California 异常温暖的环境减少了加利福尼亚湾西南部阿方索盆地的浮游微植物丰度

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-10-06 DOI: 10.1016/j.csr.2025.105582

Juan David Acevedo-Acosta , Rafael Cervantes-Duarte , Eduardo González-Rodríguez , Jaime Gómez-Gutiérrez

Global warming is significantly impacting coastal ecosystems, modifying the composition and abundance of microphytoplankton species assemblages. This study investigated the effects of prolonged anomalously warm conditions, particularly during El Niño events, on environmental conditions and net primary productivity (NPP) in Alfonso Basin, Southwest Gulf of California. We combined an in situ monthly time series of biogeochemical variables collected from 2022 to 2023 with 2003–2023 monthly satellite-derived data to identify the well-known seasonal pattern with a higher dinoflagellates/diatoms proportion in the summer and autumn and a lower dinoflagellate/diatom proportion in winter and spring. However, it remains unclear how this ratio has shifted under prolonged interannual anomalously warm conditions. Satellite 2003–2023 sea surface temperatures (SST) increased in an inverse relationship with mixed layer depth (MLD) and NPP, particularly from 2014 to 2023, when predominated SST positive anomalies. These changes were associated with decreased northwesterly winds, enhanced water column stratification, and the early influx of tropical seawater mass, all of which were driven by the transition from La Niña to El Niño event that occurred between June and December 2023. This interannual “tropicalization” phenomenon overall decreased microphytoplankton abundance and a shift in community composition increasing dinoflagellate/diatom ratio. We concluded that the interannual and decadal climate variability strongly modulate the dinoflagellate/diatom ratio dynamics. Anomalous warming events, such as those associated with El Niño and marine heat waves drive multi-year hydrological changes in the subtropical Alfonso Basin, resulting in an elevated dinoflagellate/diatom ratio under conditions of anomalous warm temperatures, increased stratification, and prevailing oligotrophic epipelagic conditions.

全球变暖对沿海生态系统产生了重大影响，改变了微型浮游植物物种组合的组成和丰度。本文研究了Alfonso盆地环境条件和净初级生产力（NPP）的长期异常温暖条件的影响，特别是在El Niño事件期间。我们将2022 - 2023年的生物地球化学变量月度时间序列与2003-2023年的月度卫星数据相结合，确定了众所周知的夏季和秋季甲藻/硅藻比例较高，冬季和春季甲藻/硅藻比例较低的季节模式。然而，在长时间的年际异常温暖条件下，这一比例如何变化仍不清楚。卫星2003-2023年海表温度（SST）与混合层深度（MLD）和NPP呈负相关，特别是2014 - 2023年海表温度以正异常为主。这些变化与西北风减少、水柱分层增强和热带海水团早期涌入有关，这些变化都与发生在2023年6 - 12月La Niña到El Niño事件的转变有关。这种年际“热带化”现象总体上降低了浮游微植物的丰度，群落组成的变化增加了鞭毛藻/硅藻的比例。年际和年代际气候变率对鞭毛藻/硅藻比动态具有强烈的调节作用。异常变暖事件（如与El Niño和海洋热浪相关的事件）驱动亚热带Alfonso盆地的多年水文变化，导致在异常温暖的温度条件下甲藻/硅藻比例升高，分层增加，以及普遍的少营养上层环境。

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引用次数: 0

Global marine plastic pollution: Sources, distribution, implications on human health and mitigation strategies 全球海洋塑料污染：来源、分布、对人类健康的影响和缓解战略

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-10-04 DOI: 10.1016/j.csr.2025.105578

Abhay B. Fulke , Shreya Bhanushali , Harshal S. Jadhav

Plastic pollution has emerged as a pressing environmental crisis, with global production surging from 2 million tonnes per year in the 1950s to a staggering 460 million tonnes in 2019. A substantial portion of this plastic waste, over 260,000 tonnes, finds its way into the world's oceans, profoundly impacting marine basins worldwide. Research indicates that an estimated 10 million metric tons of plastic are annually released into aquatic bodies. If current trends continue, an alarming 33 billion tonnes of plastic are projected to accumulate in marine ecosystems by 2050. The pervasive issue of marine litter is dominated by plastic debris, constituting approximately 80 % of all marine waste. Their widespread distribution has raised serious environmental and public health concerns. This comprehensive review identifies the diverse sources of marine plastic whose accumulation results in Global Marine Plastic Pollution (GMPP) and the global distribution of microplastics in the surface waters and sediments across continents and oceans. Moreover, this phenomenon leads to the ingestion of microplastics by various organisms within the marine ecosystem. The alarming nature of this situation calls for immediate action, which has been addressed through the implementation of international policy instruments at the global, regional, and national levels to combat marine plastic pollution. Furthermore, this review discusses the pivotal factors that promote the ingestion of microplastics and assesses their potential implications on marine organisms and human health.

塑料污染已成为一场紧迫的环境危机，全球塑料产量从20世纪50年代的每年200万吨飙升至2019年的惊人4.6亿吨。这些塑料垃圾的很大一部分，超过26万吨，进入了世界海洋，深刻地影响了世界各地的海洋盆地。研究表明，估计每年有1000万吨塑料被释放到水生生物中。如果目前的趋势继续下去，到2050年，海洋生态系统中预计将积累高达330亿吨的塑料。普遍存在的海洋垃圾问题主要是塑料垃圾，约占所有海洋垃圾的80%。它们的广泛分布引起了严重的环境和公共卫生问题。这篇综合综述确定了海洋塑料的不同来源，其积累导致全球海洋塑料污染（GMPP），以及微塑料在大陆和海洋地表水和沉积物中的全球分布。此外，这种现象导致海洋生态系统内的各种生物摄入微塑料。这一令人震惊的情况要求立即采取行动，这一问题已通过在全球、区域和国家各级执行国际政策文书来解决，以打击海洋塑料污染。此外，本文还讨论了促进微塑料摄入的关键因素，并评估了它们对海洋生物和人类健康的潜在影响。

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引用次数: 0

Modelling water flow in presence of various obstructions: description and validation of a generic module for 2- and 3-dimensional simulations 模拟水流在各种障碍的存在：描述和验证一个通用模块的2和3维模拟

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-10-02 DOI: 10.1016/j.csr.2025.105580

Florian Ganthy , Romaric Verney , Arnaud Le Pevedic , Franck Dumas

In coastal areas, various types of biological and anthropogenic structures significantly influence the flow and related sediment dynamics. In this paper, we describe a new generic flow-obstruction module, designed to represent both upward or downward, rigid or flexible structures. This module provides a particularly accurate representation of flow velocities in the presence of flexible obstructions, due to a thorough description of their bending. The obstruction/flow interaction module can operate either in 3D or 2D mode. It also offers the possibility of incorporating multiple types of obstructions within a single mesh, which is invaluable when modeling realistic ecosystem dynamics. Module validation was carried out using flume experiments on seagrasses, as well as using numerical studies involving two anthropogenic structures: mussel long-lines and oyster tables. The coupled hydrodynamic/obstruction model yielded excellent results for 2D/3D velocity fields with minimal calibration efforts. This module can be integrated into any hydrodynamic coastal model and is aimed at being upscaled to a regional scale, offering the potential to explore future trajectories regarding the vulnerability of coastal systems in response to global change, or to identify restoration measures in engineered coastal systems.

在沿海地区，各种类型的生物和人为结构显著影响着水流和相关的泥沙动力学。在本文中，我们描述了一个新的通用流阻模块，设计用于表示向上或向下，刚性或柔性结构。由于对其弯曲的全面描述，该模块提供了在存在柔性障碍物时特别准确的流速表示。阻塞/流动交互模块可以在3D或2D模式下运行。它还提供了在单个网格中合并多种类型障碍物的可能性，这在建模现实生态系统动态时是非常宝贵的。模块验证是通过在海草上进行水槽实验，以及涉及两种人为结构的数值研究进行的：贻贝长绳和牡蛎桌。水动力/阻力耦合模型在2D/3D速度场中获得了极好的结果，且校准工作最少。该模块可以集成到任何水动力海岸模型中，旨在将其扩展到区域尺度，为探索沿海系统在应对全球变化时的脆弱性的未来轨迹，或确定工程沿海系统的恢复措施提供了潜力。

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引用次数: 0

Plutonium radioisotopes as radiotracers of sedimentation processes in the Black Sea coastal areas 黑海沿岸地区沉积过程的放射性示踪剂钚放射性同位素

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-10-01 DOI: 10.1016/j.csr.2025.105579

A.A. Paraskiv, N.N. Tereshchenko, V. Yu Proskurnin

The vertical distribution of plutonium radioisotopes (²³⁸Pu and ^239+240Pu) in five bottom sediment cores from the coastal marine area of Sevastopol Bay (the Black Sea) was studied. Based on the analysis of the ²³⁸Pu, ^239+240Pu activity and ²³⁸Pu/^239+240Pu activity ratio profiles, geochronological dating of bottom sediments was carried out and the main parameters of sedimentation processes (SR – sedimentation rate and MAR – mass accumulation rate) were calculated. It was found that each of the studied areas of the Sevastopol Bay has individual sedimentation features, which are reflected in SR and MAR values. SR values ranged from 2.5 to 7.5 mm year⁻¹ while MAR – from 1679 to 4833 g m⁻²·year⁻¹. The obtained results indicate that the intensity of water self-purification via plutonium removal into the sediments varies within the studied areas. It is shown that under the conditions of the spatiotemporal regime of plutonium input into the Black Sea it is possible to determine the SR and MAR for two time periods: 1962–1986 and 1986–2019. It has been established that on a half-century scale the SR and MAR have changed in the Sevastopol Bay. Thus, in the post-Chernobyl period, in the bay mouth, the SR and MAR increased by 2.1 and 1.8 times, respectively, while in the bay headwaters they decreased by 2.0 and 2.3 times, respectively. These changes are apparently a consequence of the construction of hydraulic structures both in the Sevastopol Bay and in its drainage basin.

研究了黑海塞瓦斯托波尔湾沿海海域5个海底沉积物岩心中钚放射性同位素（238Pu和239+240Pu）的垂直分布。通过对238Pu、239+240Pu活度和238Pu/239+240Pu活度比值剖面的分析，进行了海底沉积物年代学测年，并计算了沉积过程的主要参数（SR -沉积速率和MAR -质量堆积速率）。研究发现，塞瓦斯托波尔湾每个研究区域都有各自的沉积特征，这些沉积特征反映在SR和MAR值上。SR值为2.5 ~ 7.5 mm year - 1， MAR -值为1679 ~ 4833 g m−2·year - 1。结果表明，在研究区域内，通过向沉积物中去除钚来实现水自净的强度是不同的。结果表明，在钚输入黑海的时空状态条件下，可以确定1962-1986年和1986-2019年两个时间段的SR和MAR。在半个世纪的尺度上，塞瓦斯托波尔湾的SR和MAR发生了变化。因此，在切尔诺贝利后时期，海湾口的SR和MAR分别增加了2.1和1.8倍，而海湾源头的SR和MAR分别减少了2.0和2.3倍。这些变化显然是在塞瓦斯托波尔湾及其流域建造水工结构的结果。

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引用次数: 0

Changes in free-living zooxanthellae abundance during summer in a temperate Japanese coastal sea (Takashima, Japan) 温带日本沿海夏季游离虫黄藻丰度的变化（日本高岛）

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-09-27 DOI: 10.1016/j.csr.2025.105577

Hiroyuki Takasu , Takanobu Yamaguchi , Maiko Ito , Kotaro Miyahara , Rintaro Kiyama , Manabu Fukumura , Shuzo Komura

Free-living or exogenous zooxanthellae play a crucial role in coral survival; however, their ecological dynamics remain largely unexplored. This study focused on tracking the abundance of free-living zooxanthellae (Clades A to F) in seawater around the temperate coastal sea (Takashima, Japan) from summer to early autumn using quantitative polymerase chain reaction (qPCR). In addition, we examined the influence of temperature, light conditions (photosynthetic photon flux density [PPFD]), dissolved inorganic nitrogen (DIN), and coral health on the abundance of zooxanthellae. Our findings revealed an increase in the abundance of free-living zooxanthellae from late summer to early autumn, irrespective of clade. A significant negative correlation was observed between the ribosomal RNA (rRNA) gene copy number, amplified using a universal primer, and coral health scores. Conversely, there was a positive correlation between the rRNA gene copy number and seawater temperature. The relationship between PPFD and DIN was not significantly correlated with rRNA gene copy number. Notably, the rRNA gene copy number, amplified using the Clade C primer, was the most abundant and exhibited a significant positive correlation with seawater temperature, whereas it was negatively correlated with coral health scores. The increase in the abundance of free-living zooxanthellae, particularly Clade C, in seawater was facilitated by rising seawater temperatures and the release of zooxanthellae cells from host corals, with the latter likely being the predominant factor. To our knowledge, this is the first study to monitor temporal changes in the abundance of free-living zooxanthellae in seawater.

游离或外源虫黄藻对珊瑚的生存起着至关重要的作用；然而，它们的生态动态在很大程度上仍未被探索。本研究采用定量聚合酶链式反应（qPCR）技术，对夏季至初秋期间日本高岛温带沿海海域海水中游离虫黄藻（A ~ F枝）的丰度进行了跟踪研究。此外，我们还研究了温度、光照条件（光合光子通量密度[PPFD]）、溶解无机氮（DIN）和珊瑚健康对虫黄藻丰度的影响。我们的研究结果显示，从夏末到初秋，自由生活的虫黄藻的丰度增加，无论进化支如何。使用通用引物扩增的核糖体RNA （rRNA）基因拷贝数与珊瑚健康评分之间存在显著的负相关。相反，rRNA基因拷贝数与海水温度呈正相关。PPFD与DIN的关系与rRNA基因拷贝数无显著相关。值得注意的是，使用Clade C引物扩增的rRNA基因拷贝数最丰富，与海水温度呈显著正相关，而与珊瑚健康评分呈负相关。海水温度上升和宿主珊瑚释放虫黄藻细胞促进了海水中自由生活的虫黄藻（特别是C枝）数量的增加，而后者可能是主要因素。据我们所知，这是第一个监测海水中自由生活的虫黄藻丰度的时间变化的研究。

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引用次数: 0

Insights into effects of salinity stress on the body-size spectrum of periphytic protozoan fauna in marine ecosystems 盐度胁迫对海洋生态系统周围原生动物体型谱影响的研究

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-09-19 DOI: 10.1016/j.csr.2025.105575

Awais Ali , Xiaoxiao Zhong , Guangjian Xu , Henglong Xu

To evaluate the impacts of salinity stress on the community functioning of marine ecosystems, a 1-month bioassay was performed using periphytic protozoan fauna as the test organism community within a gradient of salinity 9, 19, 29 (control), 39, and 49 PSU. The samples of the test organism assemblage were collected from an intertidal zone of the Yellow Sea, northern China. In terms of both the frequency of occurrences and the probability density, the body-size spectrum of the test protozoan fauna was clearly shifted with the test scale of salinity variability. The significant changes occurred in the body-size distinctness measures, which followed a unique trend among salinity gradients. Furthermore, the body-size spectrum showed a significant departure from an expected pattern at 9 PSU. Therefore, it is suggested that the body-size spectrum of periphytic protozoan fauna may be used as a useful tool for evaluating the effects of salinity stress on community functioning in marine environments.

为了评估盐度胁迫对海洋生态系统群落功能的影响，在盐度9、19、29（对照）、39和49 PSU梯度下，以周围原生动物动物群作为测试生物群落，进行了为期1个月的生物测定。试验生物组合样本采集于中国北部黄海潮间带。在发生频率和概率密度上，试验原生动物的体型谱随盐度变异性的试验尺度发生了明显的偏移。在不同盐度梯度中，体型差异测量值发生了显著变化，且具有独特的趋势。此外，车身尺寸谱在9 PSU处显示出与预期模式的显著偏离。因此，建议将周围原生动物的体型谱作为评估盐度胁迫对海洋环境中群落功能影响的有用工具。

引用次数: 0