Regional Studies in Marine Science最新文献_第10页

Sea level rise assessment in the Persian Gulf and Arabian Sea using geodetic observations 波斯湾和阿拉伯海使用大地测量观测评估海平面上升

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-04-08 DOI: 10.1016/j.rsma.2025.104179

Mohammad Kargar Gazkoh , Hossein Etemadfard , Farhad Rajabpour , Seyed Mohammad Alavizadeh

{"title":"Sea level rise assessment in the Persian Gulf and Arabian Sea using geodetic observations","authors":"Mohammad Kargar Gazkoh , Hossein Etemadfard , Farhad Rajabpour , Seyed Mohammad Alavizadeh","doi":"10.1016/j.rsma.2025.104179","DOIUrl":"10.1016/j.rsma.2025.104179","url":null,"abstract":"<div><div>Sea Level Rise (SLR) due to climate change is a significant concern, especially for coastal areas, posing risks to infrastructure and inhabitants. The Persian Gulf (PG) and the Arabian Sea (AS) are two vital regions, recognized for their strategic geopolitical importance, underscoring the need to evaluate sea level changes thoroughly. This study aims to quantify and analyze SLR and identify its spatiotemporal variability across the PG and AS using trend analysis and a tensor-based approach, employing tide gauge records and satellite altimetry observations. Monthly Mean Sea Level (MSL) measurements from 14 tide gauge stations in the PG and AS, from 1993 to 2021, were examined and exhibited an upward trend ranging from 0 to 100 mm per decade (mm/dec). Satellite altimetry data, presented as mean Sea Level Anomaly (SLA) across the area and gridded SLA observations from 1993 to 2022, were analyzed and it revealed an ascending trend of approximately 46 and 39 mm/dec for the PG and AS, with the notable rise in the mean SLA trend beginning around 2005. To enhance the gridded SLA data analysis, a 3D tensor was constructed, with two axes representing latitude and longitude, and the third axis representing time. A final trend map was derived from the 3D SLA tensor to illustrate the SLA trends across different locations within these regions. The SLA trend varied from 15 to 55 mm/dec, with eastern AS exhibiting the highest, while the lowest trends occurred west of AS. The coastlines generally experienced higher SLA trends compared to the nearby deep ocean. These findings underscore the growing vulnerability of some coastal zones in the PG and AS to rising sea levels, highlighting the need for adaptive coastal management strategies. The trend map derived from the SLA tensor provides valuable insights for identifying the most vulnerable zones.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"86 ","pages":"Article 104179"},"PeriodicalIF":2.1,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143829477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessment of marine debris and plastic pollution along the western coast of Sri Lanka 评估斯里兰卡西海岸的海洋垃圾和塑料污染

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-04-08 DOI: 10.1016/j.rsma.2025.104176

K.P.G.K.P. Guruge , S.M.U.P. Siriwardhana , Tharindu Bandara , W.K. Suwandhahannadi , W.N.D.S. Jayarathna , H.P.T.S. Hewathilake , P.B.T.P. Kumara

{"title":"Assessment of marine debris and plastic pollution along the western coast of Sri Lanka","authors":"K.P.G.K.P. Guruge , S.M.U.P. Siriwardhana , Tharindu Bandara , W.K. Suwandhahannadi , W.N.D.S. Jayarathna , H.P.T.S. Hewathilake , P.B.T.P. Kumara","doi":"10.1016/j.rsma.2025.104176","DOIUrl":"10.1016/j.rsma.2025.104176","url":null,"abstract":"<div><div>The accumulation of marine debris along coastal sites is a global issue, yet there is limited knowledge about this problem, particularly in island nations. In this context, the present study focused on assessing the abundance and composition of marine macro debris (>2.5 cm) as well as the abundance and characteristics of plastics along the eight beaches of the western coast of Sri Lanka. Among the macro debris, we found that local-origin, end-consumer products and packaging materials were dominant. Plastic waste was the most abundant macro debris (>50 % of debris) in all sites. Size classification of plastic waste indicated the presence of macro- (>2.5 cm), meso (5 mm–2.5 cm) and microplastics (<5 mm) in all sites where they had spatial differences in abundance. The average macroplastic abundance along the western coast of Sri Lanka was 28.51 particles/100 m². The average meso- and microplastic abundances in this study were 19.83 ± 1.56 and 51.41 ± 1.62 particles/m², respectively. Improper disposal of plastic waste, the MV X-Press Pearl ship accident, proximity to the river mouth, surface ocean currents and wind patterns likely contributed to the spatial variation of marine macro debris and plastic pollution along the western coast of Sri Lanka. Among the studied sites, there was a significant positive correlation (<em>p</em> < 0.05) among the macro-, meso-, and microplastic abundance. This indicates macro-and mesoplastic abundance can be utilized as a proxy for the microplastic abundance along the western coast of Sri Lanka. Macroplastic pollution status calculated by the clean coast index (CCI) classified Crow Island as 'extremely dirty' (CCI>20). Our study highlights the importance of implementing effective waste management systems and raising public awareness on proper waste disposal to manage marine debris pollution along the western coast of Sri Lanka.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"86 ","pages":"Article 104176"},"PeriodicalIF":2.1,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143829471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ecotoxicological assessment of sediments from the Mediterranean coast of Morocco using an integrated approach 采用综合方法对摩洛哥地中海沿岸沉积物进行生态毒理学评估

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-04-08 DOI: 10.1016/j.rsma.2025.104181

Salma Khatami , Bouchra Elhaimeur , Mina Bouhallaoui , Imane Afandi , Mariama Zbiry , Ali Benhra , Ahmed Errhif

{"title":"Ecotoxicological assessment of sediments from the Mediterranean coast of Morocco using an integrated approach","authors":"Salma Khatami , Bouchra Elhaimeur , Mina Bouhallaoui , Imane Afandi , Mariama Zbiry , Ali Benhra , Ahmed Errhif","doi":"10.1016/j.rsma.2025.104181","DOIUrl":"10.1016/j.rsma.2025.104181","url":null,"abstract":"<div><div>The Moroccan Mediterranean coast, rich in aquatic resources, faces increasing anthropogenic pressures, highlighting the need for monitoring the structural and functional integrity of aquatic ecosystems. This study aims to assess the environmental quality of marine sediments collected from five sites along the Moroccan Mediterranean coast, in order to identify sediments that could pose a risk to aquatic organisms and implement measures to improve their condition. Sediment characteristics, metal levels, and toxic effects on the microalgae <em>Tetraselmis suecica</em>, the microcrustacean <em>Artemia salina</em>, and the sea urchin <em>Paracentrotus lividus</em> were studied to evaluate the quality of different sediment phases as a reservoir of contaminants. We also combined all bioassays (algal growth inhibition, mortality, and embryotoxicity) using the Toxicity Test Battery Integrated Index (TBI) to estimate the risk level of sediments. Results revealed differences in sensitivity among the test organisms, linked to their biological and granulometric characteristics, and also to their interactions with contaminants. The assessment was supported by the analysis of trace metal elements which demonstrated a consistency with the observed biological responses. The data integration using TBI approach indicated an ecotoxicological risk at almost all sites, except for station 1 (Strait of Gibraltar), showing the utility of this index and its important role in emphasizing the necessity for the sustainable management of marine ecosystems. Our study highlights the strong potential of a multi-species approach in biological assays for accurately assessing environmental risks in coastal marine ecosystems.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"86 ","pages":"Article 104181"},"PeriodicalIF":2.1,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143829475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A demand-responsive two-echelon assembly inventory management model for a sustainable port terminal with coal mining sites 含煤矿的可持续港口码头的需求响应两级装配库存管理模型

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-04-08 DOI: 10.1016/j.rsma.2025.104177

Peipei Ding , Shi Qiang Liu , Dewang Chen , Erhan Kozan

{"title":"A demand-responsive two-echelon assembly inventory management model for a sustainable port terminal with coal mining sites","authors":"Peipei Ding , Shi Qiang Liu , Dewang Chen , Erhan Kozan","doi":"10.1016/j.rsma.2025.104177","DOIUrl":"10.1016/j.rsma.2025.104177","url":null,"abstract":"<div><div>Nowadays, coal port terminals face considerable challenges such as limited storage capacity, multiple coal brands, uncertain prices and fluctuating demand rates. In this study, a two-echelon assembly inventory model is proposed to reduce inventory costs and improve sustainability of a port terminal together with coal mining sites under complex real-world constraints. In such a two-echelon assembly structure, replenishment information from a port terminal guides several mining sites to determine their inventory levels and production targets. To solve this inventory model, we develop an improved Wagner-Whitin (W-W) algorithm to optimize demand-responsive ordering decisions and support smart port operations by incorporating several factors such as coal grade control and carbon emission costs. Computational results validate that the proposed two-echelon inventory provides new insights on how lower carbon prices can quantitatively lead to increased production, which in turn affects inventory levels at a port terminal and mining sites. This study advances the theoretical foundation of multi-echelon inventory management and provides practical suggestions to enhance sustainability of coal port terminals.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"86 ","pages":"Article 104177"},"PeriodicalIF":2.1,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143842582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Chemical characteristics of dissolved organic matter in southeastern China marginal seas are related to source and biogeochemical processes 中国东南部边缘海溶解有机质的化学特征与来源和生物地球化学过程有关

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-04-07 DOI: 10.1016/j.rsma.2025.104174

Liang Liu , Yasong Wang , Zhiliang Liu , Weichao Wu , Sishang Pan , Liuyan Wang , Yinghui Wang , Yunping Xu

{"title":"Chemical characteristics of dissolved organic matter in southeastern China marginal seas are related to source and biogeochemical processes","authors":"Liang Liu , Yasong Wang , Zhiliang Liu , Weichao Wu , Sishang Pan , Liuyan Wang , Yinghui Wang , Yunping Xu","doi":"10.1016/j.rsma.2025.104174","DOIUrl":"10.1016/j.rsma.2025.104174","url":null,"abstract":"<div><div>Marginal seas influenced by rivers play a crucial role in the global carbon cycle. In this study, we collected 24 surface water samples along a transect from the East China Sea to the South China Sea (SCS) (30.45 °N to 18.47 °N), covering four distinct regions: Yangtze River Estuary (YRE), Zhejiang-Fujian Coast (ZMC), Taiwan Strait (TWS), and SCS. We analyzed the concentration and composition of dissolved organic matter (DOM) using various techniques including ultraviolet-visible absorption, fluorescence excitation-emission matrices spectroscopy, and Fourier transform ion cyclotron resonance mass spectrometry. The YRE showed significantly higher levels of dissolved organic carbon (DOC) concentration (1.00 ± 0.06 mg L<sup>−1</sup>), chromophoric DOM concentration (1.37 ± 0.05 m<sup>−1</sup> for a<sub>325</sub>), humification degree (0.94 ± 0.04 for HIX) and aromaticity (2.35 ± 0.13 L mg<sup>−1</sup> C m<sup>−1</sup> for SUVA<sub>254</sub>). The fluorescence components, sulfur-containing compounds, and terrestrial peaks exhibited the highest levels in YRE, followed by TWS, ZMC, and SCS. A redundancy analysis of water samples revealed distinct separation of the YRE from other regions, and more uniform distributions of TWS in comparison to the ZMC and SCS. However, abrupt changes were observed in TWS likely due to local inputs of terrestrial DOM from mountainous rivers. Our study indicates that the chemical properties of DOM in Chinese marginal seas are influenced by both their origins and biogeochemical processes. We recommend further investigation into the high-resolution biogeochemistry of DOM, considering seasonal variations driven by the East Asian Monsoon and human activities along the southeastern China margin.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"85 ","pages":"Article 104174"},"PeriodicalIF":2.1,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143799917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Population structure of the deep coral Desmophyllum dianthus associated with a lost fishing gear/ line 与丢失渔具/钓线有关的深珊瑚石竹的种群结构

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-04-07 DOI: 10.1016/j.rsma.2025.104173

Pablo Villafranca-Sánchez , Elena Guijarro-Garcia , Francisca Giménez-Casalduero

{"title":"Population structure of the deep coral Desmophyllum dianthus associated with a lost fishing gear/ line","authors":"Pablo Villafranca-Sánchez , Elena Guijarro-Garcia , Francisca Giménez-Casalduero","doi":"10.1016/j.rsma.2025.104173","DOIUrl":"10.1016/j.rsma.2025.104173","url":null,"abstract":"<div><div>The habitats created by cold-water corals (CWC) are among the most complex in the deep ocean and they are considered biodiversity hotspots with incalculable biological richness. However, distribution of these coral populations on Mediterranean platforms remains relatively unknown and only six provinces with certain density of CWC are recognised to date. During an INTEMARES survey carried off the southeast Iberian Peninsula in 2020, a lost longline was recovered in one of the hauls using a hard bottom dredge. The abandoned gear revealed populations of CWC, mainly <em>Desmophyllum pertusum</em> (Linnaeus, 1758) and <em>Desmophyllum dianthus</em> (Esper, 1794). The present study aims to contribute providing information on the coral <em>D. dianthus</em> in the Mediterranean and extending the distribution range of CWC in the south-eastern Iberian Peninsula by means of a population analysis of the individuals found on the recovered gear. Abundance and density of <em>D. dianthus</em> observed on the gear were higher than reported in other CWC populations in the Mediterranean Sea. Furthermore, in light of the results, there is potential for more unidentified populations of <em>D. dianthus</em> and other CWC species to be established in the area. Results also confirm the role of unwanted anthropogenic debris as a substrate for sessile organisms.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"85 ","pages":"Article 104173"},"PeriodicalIF":2.1,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143807261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sediment, substrate, and structure: Factors shaping algal turf dynamics in urban Indonesian reefs 沉积物、基质和结构：影响印尼城市珊瑚礁藻皮动态的因素

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-04-06 DOI: 10.1016/j.rsma.2025.104172

Gunawan Syafruddin , Estradivari , Andi M.A. Pratama , Inayah Yasir , Sebastian C.A. Ferse , Rohani Ambo-Rappe

{"title":"Sediment, substrate, and structure: Factors shaping algal turf dynamics in urban Indonesian reefs","authors":"Gunawan Syafruddin , Estradivari , Andi M.A. Pratama , Inayah Yasir , Sebastian C.A. Ferse , Rohani Ambo-Rappe","doi":"10.1016/j.rsma.2025.104172","DOIUrl":"10.1016/j.rsma.2025.104172","url":null,"abstract":"<div><div>Algal turfs significantly influence coral reef ecosystems by impacting benthic community structure and overall reef health through sediment trapping and accumulation, which are vital for nutrient retention and sediment stabilization. This study examines the spatial dynamics of algal turf height and sediment thickness across eight sites in the Spermonde Archipelago, South Sulawesi, Indonesia, covering an inshore-offshore gradient (1–62 km) from reefs near urbanized Makassar city to remote reefs. Measurements of algal turf height and sediment thickness on hard substrates and coral rubble at two depths revealed a clear inshore-offshore pattern. Reefs closer to the mainland had taller algal turfs and thicker sediment layers, transitioning from long sediment-laden algal turfs (LSATs) inshore to short productive algal turfs (SPATs) offshore. Algal turfs were taller on coral rubble but had thicker sediment on hard substrates. The study showed that algal turf height had strong positive associations with both organic and inorganic sediment loads, sediment thickness, and substrate type, but was negatively associated with relative organic loads. Algal turf height was negatively correlated with reef rugosity, indicating taller algal turfs are found where reef complexity is lower, which characterized reefs closer to the mainland. These results highlight a dual role of algal turfs: increasing total sediment trapping (absolute loads) but favouring inorganic sediment deposition more than organic sediment deposition as height increases. Herbivorous fish biomass did not significantly correlate with algal turf height, suggesting that bottom-up factors, rather than top-down control, may play a more critical role in this area. These findings highlight the intricate interactions between anthropogenic influences, environmental stressors, and reef ecosystem dynamics in the Spermonde Archipelago.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"86 ","pages":"Article 104172"},"PeriodicalIF":2.1,"publicationDate":"2025-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143899781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of external driving forces on the nutrient transport in an artificial Seawater Lake 外部驱动力对人工海水湖中营养物运移的影响

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-04-05 DOI: 10.1016/j.rsma.2025.104161

Huamin Zhou , Sichang Huang , Dongfeng Xie , Junbao Huang , Guangzhi Zhang

{"title":"Impact of external driving forces on the nutrient transport in an artificial Seawater Lake","authors":"Huamin Zhou , Sichang Huang , Dongfeng Xie , Junbao Huang , Guangzhi Zhang","doi":"10.1016/j.rsma.2025.104161","DOIUrl":"10.1016/j.rsma.2025.104161","url":null,"abstract":"<div><div>Seawater lakes, with characteristics of lakes, estuaries, and oceans, face uncertainties in hydrodynamics and water quality environments due to external driving forces and nutrient transport. This study used a three-dimensional model to analyze Baisha Seawater Lake. The baroclinic model showed bottom flow velocities 2–5 times greater than the barotropic model, making it the preferred choice for such complex density-change environments. Further, external drivers (wind and runoff) significantly affected the hydrodynamics and nutrient transport of the seawater lake. Summer winds caused water circulation with flow velocity increases of 1–2 times in each layer. Runoff led to backflow zones in the surface and middle water layers of the lake. Over a one-year period, using phosphorus (P) as a nutrient indicator, we found the water quality fluctuations. Inflow water quality and the release of bed sediments were the two main factors for higher P concentrations in spring and summer. These findings are crucial for managing Baisha Lake and other similar seawater lakes, and should be considered in lake-related planning and construction.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"86 ","pages":"Article 104161"},"PeriodicalIF":2.1,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Environmental filtering-driven deterministic processes dominate the biogeographic patterns of microeukaryotes in the surface waters of the Changjiang River Estuary and adjacent coastal areas 环境过滤驱动的确定性过程主导了长江口及邻近沿海表层水体微真核生物的生物地理格局

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-04-05 DOI: 10.1016/j.rsma.2025.104169

Chunxue Wang , Zhu Zhu , Yuntao Wang , Feng Zhou , Ruifeng Zhang

{"title":"Environmental filtering-driven deterministic processes dominate the biogeographic patterns of microeukaryotes in the surface waters of the Changjiang River Estuary and adjacent coastal areas","authors":"Chunxue Wang , Zhu Zhu , Yuntao Wang , Feng Zhou , Ruifeng Zhang","doi":"10.1016/j.rsma.2025.104169","DOIUrl":"10.1016/j.rsma.2025.104169","url":null,"abstract":"<div><div>Understanding the biogeographic patterns and the driving factors of microeukaryotic community is the central question in marine microbial ecology. At the regional scale, the relative contributions of different environmental factors and spatial factor to the microeukaryotic community remain contradictory. This study delineated the community structure of microeukaryotes in the surface water of the Changjiang River Estuary and adjacent coastal areas by high-throughput sequencing of 18S rRNA gene. We found that deterministic processes dominated microeukaryotic community assembly in the study area. Besides, we quantified the contribution of multiple environmental factors and spatial factor to the microeukaryotic community structure. The results showed that environmental factors rather than spatial factors were the predominant drivers for microeukaryotic community dissimilarity. Temperature and turbidity were the most important environmental factors to structure microeukaryotic community. To sum up, our study provides insights into the quantitative drivers of microeukaryotic community assembly.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"86 ","pages":"Article 104169"},"PeriodicalIF":2.1,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143829470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Temporal dynamics of transparent exopolymer particles in surface waters and sea surface microlayer in the coastal Eastern Mediterranean Sea 东地中海沿岸表层水和海面微层中透明外聚合物颗粒的时间动态

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-04-03 DOI: 10.1016/j.rsma.2025.104163

Eleni Tzempelikou, Christina Zeri, Elli Pitta, Georgia Assimakopoulou, Alexandra Pavlidou, Eleni Rousselaki

{"title":"Temporal dynamics of transparent exopolymer particles in surface waters and sea surface microlayer in the coastal Eastern Mediterranean Sea","authors":"Eleni Tzempelikou, Christina Zeri, Elli Pitta, Georgia Assimakopoulou, Alexandra Pavlidou, Eleni Rousselaki","doi":"10.1016/j.rsma.2025.104163","DOIUrl":"10.1016/j.rsma.2025.104163","url":null,"abstract":"<div><div>The aim of this study is to investigate the dynamics of transparent exopolymer particles (TEPs) in relation to phytoplankton, dissolved/total organic carbon (DOC-TOC), dissolved monosaccharides (MCHOs), dissolved polysaccharides (PCHOs), in surface waters including the sea surface microlayer (SML), during an annual cycle at a coastal site in the Eastern Mediterranean Sea. TEPs in the SML ranged from 238 to 1094 μg Xeq L<sup>−1</sup> and in the ULW from 112 to 674 μg Xeq L<sup>−1</sup>. Mean SML enrichment factors (EFs) compared to underlying water (ULW) were found equal to 1.7 ± 0.8, 3.4 ± 2.0, 4.2 ± 2.9 and 3.5 ± 2.7 for TEPs, DOC, MCHOs and PCHOs, respectively, indicating a variable SML enrichment. TEPs did not show any correlation with Chlorophyll a (Chla) and were maintained in surface waters for a long period presenting a significant positive relationship to water temperature (T). The carbon content of TEPs (TEP-C) corresponded to ∼7 % of TOC in the SML and to ∼20 % in the ULW. Although, the annual variability of TEPs followed similar patterns in the two layers, correlation analysis and Principal component analysis (PCA) indicate that different processes take place between the SML and ULW. In the ULW, TEPs increase in parallel to MCHOs and in the expense of PCHOs. In the SML, TEPs and Dissolved Carbohydrates (CHOs) do not correlate while a strong positive correlation is established between the two CHO fractions. These differences show the decoupling of TEPs precursor material between the two layers in coastal waters of the Saronikos Gulf and suggest that different processes take place in the two layers.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"85 ","pages":"Article 104163"},"PeriodicalIF":2.1,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143807262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0