Regional Studies in Marine Science最新文献

Environmental magnetic signatures and textural profiling of rivers sediments: An assessment from Tamil Nadu’s East Coast, India 河流沉积物的环境磁特征和结构剖面：来自印度泰米尔纳德邦东海岸的评估

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-07-16 DOI: 10.1016/j.rsma.2025.104352

Baranidharan Sathyanarayanan , Vasudevan Sivaprakasam , Sivaranjan Periyasami, Pravinraj Sambath, Vigneshwar Jeyasingh

{"title":"Environmental magnetic signatures and textural profiling of rivers sediments: An assessment from Tamil Nadu’s East Coast, India","authors":"Baranidharan Sathyanarayanan , Vasudevan Sivaprakasam , Sivaranjan Periyasami, Pravinraj Sambath, Vigneshwar Jeyasingh","doi":"10.1016/j.rsma.2025.104352","DOIUrl":"10.1016/j.rsma.2025.104352","url":null,"abstract":"<div><div>This study investigates an environmental magnetism and textural parameters on the Gadilam and Uppanar River sediments, specifically in the Cuddalore district of Tamil Nadu, India. There is a signifcant lack of research on the pollution study based on environmental magnetism unique to the Gadilam and Uppanar river sediments. Consequently, the purpose of the study mainly aimed to address the bonding of magnetic content and pollution status with the textural characteristics of the river sediments. Meticulous observation of the textural characteristics of the river sediments implies that Gadilam River sediments mainly consists of sand and silt, whereas the Uppanar river sediments dominantly comprises of sand compositions. Heavy metal concentration of Gadilam river arranges on Al > Fe > Ti > Mn > Zn > Cr > Cu > Ni > Pb, whereas the Uppanar River shows Al > Fe > Ti > Mn > Zn > Cr > Ni > Cu > Pb. The result shows low frequency of magnetic susceptibility of Uppanar River sediment indicates the higher magnetic susceptibility than Gadilam River sediment may due to influences of ferromagnetic components. Statistical analysis of this study illustrates, good relationship between the sand and silt fraction with the low-field magnetic frequency of the studied River sediments. The frequency dependence of Gadilam River sediments shows mixed grains, whereas the Uppanar River sediments indicating the no superparamagnetic grains. Also, the environmental contamination indices i.e. geoaccumulation index exhibits the heavy metals falls in the moderately polluted to extremely polluted category. This study demonstrates that environmental magnetism can be a convincing tool for rapid monitoring and qualitative assessment of pollution levels in urban rivers.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"89 ","pages":"Article 104352"},"PeriodicalIF":2.1,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144670234","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

Potential health and ecological risk assessment of selected heavy metals in Dammam coastal sediments, Arabian Gulf 阿拉伯湾达曼沿海沉积物中选定重金属的潜在健康和生态风险评估

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-07-16 DOI: 10.1016/j.rsma.2025.104354

Abdelbaset S. El-Sorogy , Hamdy E. Nour , Khaled Al-Kahtany , Mohamed Youssef , Talal Alharbi , Momoh A. Yakubu

{"title":"Potential health and ecological risk assessment of selected heavy metals in Dammam coastal sediments, Arabian Gulf","authors":"Abdelbaset S. El-Sorogy , Hamdy E. Nour , Khaled Al-Kahtany , Mohamed Youssef , Talal Alharbi , Momoh A. Yakubu","doi":"10.1016/j.rsma.2025.104354","DOIUrl":"10.1016/j.rsma.2025.104354","url":null,"abstract":"<div><div>This study is one of the innovative attempts to evaluate health risks in the Arabian Gulf region. It aims to assess the quality of coastal sediments in one of the most significant coastal areas between Dammam and Jubail along the Saudi Arabian Gulf coast by assessing the potential environmental and health risks of heavy metals (HMs) in coastal sediments. This was achieved by determining the concentrations of HMs in 26 coastal sediment samples from the study area using ICP-MS. The results of environmental indices, including the contamination index (Cf), soil pollution index (SPI), modified contamination degree (mC<sub>deg</sub>), and pollution load index (PLI), indicate that these coastal sediments are generally free from contamination, as the recorded values were below pollution thresholds < 1. Furthermore, the results of health risk assessments using chronic daily intake (CDI), hazard quotient (HQ), hazard index (HI), and cancer risk (CR) indicate that beach sediments currently pose no carcinogenic or non-carcinogenic health risks, with CR values ranging between 10⁻⁵ and 10⁻⁹. However, continuous monitoring is essential to detect future pollution trends and mitigate potential health risks.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"89 ","pages":"Article 104354"},"PeriodicalIF":2.1,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144665895","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

Nekton communities and their seasonal variation in salt marshes of the Yangtze estuary 长江口盐沼生物群落及其季节变化

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-07-14 DOI: 10.1016/j.rsma.2025.104351

Changlu Wu, Xihan Wang, Zihang Wang, Cuizhang Fu, Qiang He

{"title":"Nekton communities and their seasonal variation in salt marshes of the Yangtze estuary","authors":"Changlu Wu, Xihan Wang, Zihang Wang, Cuizhang Fu, Qiang He","doi":"10.1016/j.rsma.2025.104351","DOIUrl":"10.1016/j.rsma.2025.104351","url":null,"abstract":"<div><div>A first step to understand the ecological functions of nekton and promote their conservation is characterizing their community structure and dynamics. Although nekton communities in coastal wetlands (such as tidal flats, tidal creeks, and nearshore waters) have been widely reported in many regions globally, studies in vegetated salt marshes - a broadly-distributed type of coastal wetlands - has yet to be conducted in China. We investigated the community structure and seasonal variations of nekton in three salt marshes dominated by the foundational plant <em>Scirpus mariqueter</em> in the Yangtze estuary. We found that nekton communities in these salt marshes primarily consisted of bottom-dwelling fish and crustaceans, with a total of 11 fish species, two crab species, and one shrimp species. There were strong seasonal variations in the abundance, biomass, species diversity, and community structure of nekton, with consistent patterns across the three sites. Abundance and biomass were highest in summer (accounting for 85.42 % and 71.76 % of the total catch, respectively) and lowest in winter (both below 1 %), while species diversity was greatest in spring (11 species recorded) and lowest in winter (only one species recorded). These results suggest that nekton use salt marshes as habitats in the Yangtze estuary, depending on season. Our study provides a baseline for understanding the community characteristics and ecological functions of nekton in the salt marshes of the Yangtze estuary and highlights the importance of incorporating seasonal dynamics into such understanding.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"89 ","pages":"Article 104351"},"PeriodicalIF":2.1,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144652994","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

Genetic diversity and population structure of yellowfin seabream (Acanthopagrus latus) along the Chinese coast using 2b-RAD technology 利用2b-RAD技术研究中国沿海黄鳍海鲷的遗传多样性和种群结构

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-07-13 DOI: 10.1016/j.rsma.2025.104350

Yanbo Zhao , Long hui Liu , Zhangfan Huang , Zhongbao Li

{"title":"Genetic diversity and population structure of yellowfin seabream (Acanthopagrus latus) along the Chinese coast using 2b-RAD technology","authors":"Yanbo Zhao , Long hui Liu , Zhangfan Huang , Zhongbao Li","doi":"10.1016/j.rsma.2025.104350","DOIUrl":"10.1016/j.rsma.2025.104350","url":null,"abstract":"<div><div>The yellowfin seabream (<em>Acanthopagrus latus</em>) is a commercially valuable fish species inhabiting the northwest Pacific and is also an important fisheries resource in China. However, overexploitation of marine resources in recent years has had a certain impact on the natural resources of its wild populations. To assess the status of its wild genetic resources, we employed 2b-RAD technology to identify 81,044 high-quality SNP loci from 99 individuals across 10 regions along the Chinese coast. Utilizing these SNP loci, we assessed the genetic diversity and population structure of 10 yellowfin seabream populations and conducted a demographic history analysis for the species along the Chinese coast. The study results indicate that there was not much difference in the genetic diversity among the 10 populations, all of which were at a relatively low level. No genetic differentiation has been observed among the 10 populations. The 99 individuals showed close kinship, clustering as a single population. Demographic history analysis revealed a rapid expansion of the yellowfin seabream population during the Late Pleistocene. This study provides important insights into the current status of wild yellowfin seabream resources along Chinese coast and underscores the need for effective and scientific conservation measures. The findings also provide a theoretical basis and reference for the conservation and sustainable utilization of its genetic resources.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"89 ","pages":"Article 104350"},"PeriodicalIF":2.1,"publicationDate":"2025-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144632554","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

Incorporating knowledge graph and multi-model stacking ensemble learning for prediction of fines for illegal fishing 结合知识图谱和多模型叠加集成学习的非法捕捞罚款预测

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-07-12 DOI: 10.1016/j.rsma.2025.104332

Hongchu Yu , Yuhao Xiao , Chen Chen , Junhua Zhou , Lei Xu

{"title":"Incorporating knowledge graph and multi-model stacking ensemble learning for prediction of fines for illegal fishing","authors":"Hongchu Yu , Yuhao Xiao , Chen Chen , Junhua Zhou , Lei Xu","doi":"10.1016/j.rsma.2025.104332","DOIUrl":"10.1016/j.rsma.2025.104332","url":null,"abstract":"<div><div>Illegal fishing activities have a significant threat to global marine resource management, inflicting severe damage on marine ecosystems, disrupting legal fisheries economies, and hindering biodiversity conservation efforts. Research on Illegal, Unreported, and Unregulated (IUU) fishing activities have gained substantial attention globally, focusing on identification, monitoring, prevention, and policy formulation. However, limited efforts have been directed toward the prediction of fines and the assessment of legal repercussions. This gap hampers the timely accurate evaluation of the economic impacts of IUU fishing behaviors and undermines the full deterrent potential of legal penalties. Therefore, this paper proposes an integrated method combining knowledge graph and multi-model stacked generalization, aiming to enhance the accuracy of fines prediction for illegal fishing activities. Experimental results demonstrate that the proposed model significantly enhances prediction accuracy, interpretability, and stability compared with basic machine learning models, including eXtreme Gradient Boosting (XGBoost), Gradient Boosting Machines (GBM), K-Nearest Neighbor(K-NN), Categorical Boosting (CatBoost), and Random Forest(RF). This study provides a new technical guidance for the prediction of fines for illegal fishing activities, contributing significantly to enhancing the efficiency and effectiveness of fishery law enforcement.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"89 ","pages":"Article 104332"},"PeriodicalIF":2.1,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144604658","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

Identifying sediment composition and microplastic formation in the production water of flexible pipelines 柔性管道生产水中沉积物组成及微塑性形成的识别

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-07-12 DOI: 10.1016/j.rsma.2025.104348

Frederico G. de A. Dias, Edilainea A.O. Melo, Antônio Pedro A. da C.P. Gomes, Marysilvia F. da Costa, José A. da C.P. Gomes

{"title":"Identifying sediment composition and microplastic formation in the production water of flexible pipelines","authors":"Frederico G. de A. Dias, Edilainea A.O. Melo, Antônio Pedro A. da C.P. Gomes, Marysilvia F. da Costa, José A. da C.P. Gomes","doi":"10.1016/j.rsma.2025.104348","DOIUrl":"10.1016/j.rsma.2025.104348","url":null,"abstract":"<div><div>Two distinct kinds of sediments found in the pressure sheath of a decommissioned water injection pipeline were analyzed through Scanning Electron Microscope/Energy-dispersive X-ray spectroscopy (SEM/EDS), X-ray diffraction (XRD), and Attenuated Total Reflectance-Fourier Transformed Infrared (ATR-FTIR) spectroscopy. The analysis showed that as the pipeline sections get farther from the well, the composition of the sediment changes. The red-colored sediments showed much more iron in the form of iron hydroxide, while the grayish sediments showed more calcium in the form of calcium carbonate, and both kinds of samples showed the presence of Polyethylene (PE) polymer. The iron oxide was attributed to the corrosion of the pipeline, which is carried by water during the injection process. The PE in the deposits was attributed to the erosion of the pressure sheath and the use of cleaning agents containing polymers. This indicates that careful measures need to be taken to deal with this potential problem regarding microplastics in the case of a leak or the soil.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"89 ","pages":"Article 104348"},"PeriodicalIF":2.1,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144634425","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

Stranding of marine megafauna in Moroccan waters: Species diversity, spatio-temporal distribution and main threats 摩洛哥水域巨型海洋动物搁浅：物种多样性、时空分布和主要威胁

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-07-12 DOI: 10.1016/j.rsma.2025.104349

Fatima Zahra Hamiche , Bilal Mghili , Mustapha Aksissou , Manjula Tiwari

{"title":"Stranding of marine megafauna in Moroccan waters: Species diversity, spatio-temporal distribution and main threats","authors":"Fatima Zahra Hamiche , Bilal Mghili , Mustapha Aksissou , Manjula Tiwari","doi":"10.1016/j.rsma.2025.104349","DOIUrl":"10.1016/j.rsma.2025.104349","url":null,"abstract":"<div><div>We report the initial study on marine megafauna strandings in Moroccan waters (Atlantic and Mediterranean), conducted over a 10 year of study period from 2014 to 2023. Altogether, 524 marine megafauna strandings were documented, encompassing 9 families and 24 species. Cetaceans and sea turtles constitute 85.5 % (n = 448) and 14.5 % (n = 76) of the total stranded individuals, respectively. Of the 24 species identified stranded, seven species were classified as Endangered by the IUCN. The number of strandings events raised significantly between 2014 and 2023 and more rapidly between 2020 and 2023, which is probably due to growing anthropogenic activities and observation efforts in Moroccan waters. Specifically, Atlantic waters host the highest taxonomic diversity of marine megafauna (17 species of cetaceans and 2 species of sea turtles) compared to the Mediterranean (10 species of cetaceans and 2 species of sea turtles). <em>Delphinus delphis</em> (n = 151, 28.8 %), <em>Stenella coeruleoalba</em> (n = 60, 11.5 %), <em>Balaenoptera acutorostrata</em> (n = 52, 9.9 %) and <em>Globicephala melas</em> (n = 5) were the most frequently stranded cetacean species. For sea turtles, the most frequently recorded species was <em>Caretta caretta</em> (n = 52, 9.9 %) followed by <em>Dermochelys coriacea</em> (n = 24, 4.6 %). Strandings were observed throughout the year in Moroccan waters, but peaked in summer (June-August, n = 153, 29.2 %). The majority of stranding were associated to anthropogenic interactions. Among these instances, the bycatch was the primary factor in 257 occurrences of stranding. Our results contributed to a better understanding of marine megafauna communities in both Moroccan coasts, which are essential for improving research, management and conservation of marine turtles and cetaceans.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"89 ","pages":"Article 104349"},"PeriodicalIF":2.1,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144614730","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

Habitat suitability of two benthopelagic fish species in the Caspian Sea using maximum entropy model 利用最大熵模型分析里海两种底栖鱼类的生境适宜性

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-07-12 DOI: 10.1016/j.rsma.2025.104334

Ali Rezamand , Hasan Fazli , Hasan Nasrollahzadeh Saravi , Sana Sharifian

{"title":"Habitat suitability of two benthopelagic fish species in the Caspian Sea using maximum entropy model","authors":"Ali Rezamand , Hasan Fazli , Hasan Nasrollahzadeh Saravi , Sana Sharifian","doi":"10.1016/j.rsma.2025.104334","DOIUrl":"10.1016/j.rsma.2025.104334","url":null,"abstract":"<div><div>Protecting valuable aquatic reserves requires understanding marine species' geographical locations and selected habitats. The current research uses the maximum entropy model (MaxEnt) and 21 environmental parameters to model the distribution of <em>Chelon saliens</em>, and <em>Vimba persa</em>, in the Iranian coast waters of the Caspian Sea (CS). The study encompassed 302 sampling efforts, where presence percentages for <em>C. saliens</em>, and <em>V. persa</em> were 203 (50.87 %), and 99 (24.81 %), respectively. The optimal algorithm for <em>C. saliens</em> was random forest (rf), achieving 83 % accuracy. For <em>V. persa</em>, the best-performing algorithm was the support vector machine (svm), with an accuracy of 80 %. The area under the system performance characteristic curve (AUC) learning scores for each species was above 0.9, indicating the high predictive power of the MaxEnt model in determining species' actual distribution. For <em>C. saliens</em>, key environmental factors such as oxygen percentage saturation (DO%, 34 %), photosynthetically active radiation (PAR, 11 %), and sea surface temperature (SST, 7 %) played a significant role in predicting the species distribution. Similarly, for <em>V. persa</em>, environmental variables such as PAR (34 %), SST (19 %), and ammonium (7 %) emerged as the most influential predictors. Based on this model, the percentage of high-desirability habitats in <em>V. persa</em> and <em>C. saliens</em> varied from 38 % to 73 %, respectively. In conclusion, because of the ecological importance of these benthopelagic species, it is imperative to implement appropriate management strategies. These should include protecting desirable habitats, enforcing fishing bans in certain areas, and attempting to develop suitable areas to mitigate potential harm to their populations.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"89 ","pages":"Article 104334"},"PeriodicalIF":2.1,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144604660","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

Estimation of isoscapes, trophic positions, and trophic niches of demersal fishes and squids in the East China Sea inferred from stable isotope ratios 基于稳定同位素比值的东海底栖鱼类和乌贼等位、营养位置和营养生态位估算

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-07-12 DOI: 10.1016/j.rsma.2025.104335

Shintaro Gomi, Takeshi Sakai, Takahito Masubuchi, Tomoaki Iseki, Seiji Ohshimo

{"title":"Estimation of isoscapes, trophic positions, and trophic niches of demersal fishes and squids in the East China Sea inferred from stable isotope ratios","authors":"Shintaro Gomi, Takeshi Sakai, Takahito Masubuchi, Tomoaki Iseki, Seiji Ohshimo","doi":"10.1016/j.rsma.2025.104335","DOIUrl":"10.1016/j.rsma.2025.104335","url":null,"abstract":"<div><div>Stable isotopes facilitate the comparison of isotope niches across populations, allow for the estimation of community metrics related to dietary preferences, enable the integration of diet over various time scales, and assist in identifying functional groups as well as isotopic niche overlap among populations. Tagging programs are commonly used to study the habitats and migration patterns of fish. However, the diversity of demersal fish species is high, and archival tagging instruments are expensive. Isoscapes of stable isotope ratios of carbon (δ<sup>13</sup>C) and nitrogen (δ<sup>15</sup>N) in demersal species were generated using 1802 measured values of demersal species in the East China Sea. We then used generalized additive models (GAMs) to assess explanatory variables, such as feeding habits, body form, and season. The high values of δ<sup>13</sup>C and δ<sup>15</sup>N areas were observed in the central East China Sea due to the Changjiang River plume. These isoscapes can be used to estimate habitats and migration of demersal species. High trophic niche overlap ratios (> 0.5) were observed among crustaceans, fish, benthos, gelatinous, and plankton feeders, which were separated from other groups. The species with the highest trophic position was the Longtooth grouper (TP = 4.4; <em>Epinephelus bruneus</em>), and the lowest was <em>Okamejei acutispina</em> and <em>Psenes maculatus</em> (TP = 3.2). Such trophic niche overlap ratios and trophic positions are useful for the construction of ecosystem-based fishery management.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"89 ","pages":"Article 104335"},"PeriodicalIF":2.1,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144604659","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

Ichthyofaunal community assemblage and spatiotemporal patterns in the Bons Sinais Estuary, Mozambique: Ecological drivers and conservation implications 莫桑比克Bons Sinais河口鱼类群落组合与时空格局：生态驱动因素与保护意义

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-07-10 DOI: 10.1016/j.rsma.2025.104344

Jeremias J. Mocuba , Eudriano F.S. Costa , Maria Alexandra Teodósio , Francisco Leitão

{"title":"Ichthyofaunal community assemblage and spatiotemporal patterns in the Bons Sinais Estuary, Mozambique: Ecological drivers and conservation implications","authors":"Jeremias J. Mocuba , Eudriano F.S. Costa , Maria Alexandra Teodósio , Francisco Leitão","doi":"10.1016/j.rsma.2025.104344","DOIUrl":"10.1016/j.rsma.2025.104344","url":null,"abstract":"<div><div>Understanding the ichthyofaunal assemblage of estuarine and adjacent coastal ecosystems is important for managing fishery resources and implementing conservation actions. This study explored the structure, diversity, and spatial-temporal variations of the ichthyofauna in the Bons Sinais Estuary (Mozambique) and the influence of environmental parameters. Fish sampling was conducted in the lower, middle, and upper zones using beach seine (active) and chicocota (fixed) gears in January 2020 and monthly from July 2020 to June 2021. The study identified 102 fish species, mostly of marine origin, belonging to 51 families. The most abundant families were Sciaenidae, Engraulidae, Clupeidae, Mugilidae, and Gobiidae, contributing over 78 % of the total catch. The most dominant species were <em>Thryssa vitrirostris</em>, <em>Johnius dussumieri</em>, <em>Johnius dorsalis</em>, <em>Sardinella albella</em>, <em>Mugil cephalus</em>, and <em>Hilsa kelee</em>, which accounted for more than half (52.43 %) of the abundance and 48.27 % of the biomass. The study found an ichthyofaunal community characterised by significant spatial variations, primarily influenced by salinity. The dominance of marine species in the lower and middle estuary contrasted with freshwater species in the upper zone. Dominant species showed spatial variations in abundance and biomass, but fewer showed seasonal variations. The middle estuary exhibited the highest species richness, diversity, and average abundance, while the lower zone had the highest biomass average. Threatened species, including <em>Oreochromis mossambicus</em>, comprised 3.4 % of the total abundance<em>.</em> These findings highlight the need for sustainable exploitation of fisheries resources and preserving the ecological functions of the Bons Sinais Estuary, which is important for resident and migratory species.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"89 ","pages":"Article 104344"},"PeriodicalIF":2.1,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144653736","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}

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