Regional Studies in Marine Science最新文献

{"title":"Kinetics and toxicity of atypical microplastics in the manila clam Ruditapes philippinarum: A quantitative analysis of accumulation and excretion","authors":"Yooeun Chae ,&nbsp;Yunwi Heo ,&nbsp;Jin Soo Choi ,&nbsp;Hyeonji Nam ,&nbsp;Tae Hee Kim ,&nbsp;June-Woo Park","doi":"10.1016/j.rsma.2025.104012","DOIUrl":"10.1016/j.rsma.2025.104012","url":null,"abstract":"<div><div>Recently, microplastics (MPs) are ubiquitous environmental pollutants, and many organisms are indiscriminately exposed to microplastics across different environments. We evaluated the patterns of accumulation and excretion of MPs of various sizes in the Manila clam <em>Ruditapes philippinarum</em>. Additionally, oxidative stress and inflammation-related responses of the clams exposed to MPs were analyzed. Significant differences in the accumulation and excretion of MPs were observed with the size variation of MPs and these differences impacted the filtration efficiency of clams. This suggests that the function of clams as a filter feeder may be compromised after MP exposure. MPs also induced oxidative stress and inflammatory responses after exposure. These results suggest that the kinetics of MPs in organisms may be variable related to the particle size and these MPs can influence the filtration efficiencies and the physical conditions of bivalves in marine ecosystems.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"82 ","pages":"Article 104012"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143178915","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}

{"title":"Mercury speciation in a complex tropical estuarine system: Understanding natural and anthropogenic influences","authors":"Prasad P. Padalkar ,&nbsp;Parthasarathi Chakraborty ,&nbsp;Soham Chatterjee ,&nbsp;Debashish Pradhan ,&nbsp;Deepak R. P ,&nbsp;Arindam Sarkar ,&nbsp;Saranya Jayachandran","doi":"10.1016/j.rsma.2024.104000","DOIUrl":"10.1016/j.rsma.2024.104000","url":null,"abstract":"<div><div>Mercury (Hg) pollution is a major issue in many tropical estuarine systems. This study presents the distribution and speciation of mercury in Vembanad Lake (the largest estuarine system on the west coast of India), a RAMSAR site. It unravels how natural ligands control Hg speciation in the estuarine sediment system. Sedimentary Hg concentrations in the estuarine system varied from 3.5 ± 0.3 µg/kg to 50,105.0 ± 2505 µg/kg. The northern part of the lake exhibited exceptionally high sedimentary Hg concentrations (39.8 ± 2.4 µg/kg to 50,105 ± 2505 µg/kg), likely due to nearby industrial discharge. The central (3.5 ± 0.3 µg/kg to 116.0 ± 7.8 µg/kg) and southern regions (18.4 ± 1.1 µg/kg to 75.1 ± 1.0 µg/kg) had comparatively lower sedimentary Hg levels. Chemical speciation (Thermo-desorption technique) analysis revealed that sedimentary organic matter (SOM) acted as the primary host for Hg (21.6–100 % of total Hg), followed by sedimentary sulphides (SS) (below detection limit- 47.5 % of total Hg). The δ¹³C values for sediment samples ranged from −23.3 ‰ to −29.9 ‰. The end member mixing model indicates that SOM in the lake were derived from diverse sources, including terrestrial plants, soil OM, marine-derived organic matter, and anthropogenic activities like the coconut husk retting process. This study demonstrated how variations in natural ligand concentrations influenced the distribution and speciation of Hg in the system, and proposed a detailed mechanism for these processes. This study also suggests that activities related to disturbing sediment must be conducted cautiously to minimize Hg mobility and protect the ecosystem and human health in the region. The outcome of the research is expected to assist decision-makers in controlling Hg pollution in the estuary.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"82 ","pages":"Article 104000"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143179547","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}

{"title":"Spatial and seasonal changes of microphytoplankton community assemblages, including harmful species in Acapulco Bay, Mexico","authors":"Victor A. Cervantes-Urieta ,&nbsp;Lorena M. Durán-Riveroll ,&nbsp;Agustín A. Rojas-Herrera ,&nbsp;Giovanni Moreno-Díaz ,&nbsp;Alejandra Galeana-Parra ,&nbsp;Allan D. Cembella","doi":"10.1016/j.rsma.2025.104040","DOIUrl":"10.1016/j.rsma.2025.104040","url":null,"abstract":"<div><div>The composition of marine phytoplankton communities and environmental factors influencing their dynamics establish the trophic state of coastal ecosystems. The spatial distribution of the microphytoplankton community in Acapulco Bay, Mexico, was determined during two climatic seasons (dry and rainy). Dinoflagellates constituted the dominant group of microphytoplankton, followed by diatoms in both seasons. There was low numerical diversity but maximum dominance associated with harmful algal bloom (HAB) taxa, such as the diatom <em>Pseudo-nitzschia</em> and the dinoflagellate <em>Dinophysis —</em> potential producers of amnesic- (AST) and diarrheic-shellfish toxins (DST), respectively. Higher maximum nutrient concentrations likely promoted dominance of HAB species during the rainy season. Community structure analysis revealed that temperature and nutrients, e.g., inorganic phosphate and nitrate/ammonium concentrations, were key factors in the proliferation of the dinoflagellates <em>Dinophysis caudata</em> during the dry season and <em>Triadinium polyedricum</em> during the rainy season. The seasonal assemblages of dominant microphytoplankton species and HAB-forming taxa constitute a historical reference and provide essential knowledge for decision-making on biodiversity stability in the face of climate change.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"82 ","pages":"Article 104040"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143179548","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}

{"title":"Unraveling the seasonal, habitat, and dietary influences on the fatty acid quality of fishes of the Vembanad Kol Wetland, the largest RAMSAR region on the south-west coast of India","authors":"G. Vineetha ,&nbsp;Kusum Komal Karati ,&nbsp;R. Parvathy ,&nbsp;Keziya James ,&nbsp;Grinson George","doi":"10.1016/j.rsma.2025.104020","DOIUrl":"10.1016/j.rsma.2025.104020","url":null,"abstract":"<div><div>Fishes have a vital role in providing nutritional security to a major share of the global population. However, the knowledge of the nutritional values of fish from the perspective of lipid quality in coastal waters of India is limited and thus it is difficult to provide information in perspective of their human health-promoting and prophylactic attributes. Hence, the nutritional quality of major economically harvestable fishes of the Vembanad Kol Wetland (VKW), the largest RAMSAR site on the west coast of India, was studied based on their lipid content and composition during dry and wet seasons. The high saline and plankton-rich environment of the dry season augmented their nutritional quality. Diverse habitat usages and feeding modes of different fishes influenced their essential fatty acid profiles. The study depicting the potential health and prophylactic benefits of VKW fishes will be beneficial in augmenting the nutritional and economic security of the inland population.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"82 ","pages":"Article 104020"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143178483","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}

{"title":"Assessing microplastics in aquatic ecosystem: Sources, effects, and nature-based solution. A review","authors":"Nishita Narwal ,&nbsp;Mian Adnan Kakakhel","doi":"10.1016/j.rsma.2025.104030","DOIUrl":"10.1016/j.rsma.2025.104030","url":null,"abstract":"<div><div>Microplastics (MPs) in the world ocean ranges from 0.002 to 62.50 item/m³, with a mean abundance of approximately 2.76 items/m³, with a mean size 2.50–2.63 mm. Plastics enter aquatic environments without treatment and undergo photodegradation, mechanical decomposition, and bacterial breakdown, which fragment them into finer particles. The potential toxic effects of these MPs on a diverse range of aquatic organisms and humans have generated global concern. MPs that are ingested by aquatic organisms can result in substantial adverse health effects, such as accumulation, impaired reproduction, disturbed functioning of gills, altered swimming behavior, immunosuppression, and bacterial dysbiosis. Various approaches have been applied for the removal of MPs; however, a nature-based mechanism is proposed, which could play a significant role in the mitigation of MPs in aquatic environments. This article provides a concise overview of the potential origins, pathways, bioavailability, trophic transfer, and effects of MPs on aquatic organisms. In addition, the review article aimed to emphasize a range of mitigation strategies, including the application of nanotechnology for MPs.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"82 ","pages":"Article 104030"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143178518","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}

{"title":"Molecular signatures reveal intra-species divergence, undetectable by traditional morphology, in the deadly box jellyfish, Chironex yamaguchii (Cubozoa; Chirodropidae) of Western Pacific","authors":"Sheldon Rey Boco ,&nbsp;Christine Gloria Grace Capidos ,&nbsp;Raffy Jay Fornillos ,&nbsp;Phuping Sucharitakul ,&nbsp;Jonathan W. Lawley ,&nbsp;Dennis Talacay ,&nbsp;Allen G. Collins ,&nbsp;Ian Kendrich Fontanilla ,&nbsp;Joseph Elliz Comendador ,&nbsp;Facundo Rey M. Ladiao","doi":"10.1016/j.rsma.2025.104033","DOIUrl":"10.1016/j.rsma.2025.104033","url":null,"abstract":"<div><div>Extensive systematics studies have led to remarkable advances in understanding cubozoan diversity, but identifying chirodropid species remains challenging due to morphological similarities and early taxonomic placements of many cubomedusae. Building from this state of knowledge, we investigated the identity of a venomous and deadly chirodropid box jellyfish in the Western Pacific (the Philippines and Japan) by analysing molecular and morphological features of the species. Here, we hypothesised that <em>Chironex yamaguchii</em> occurs in the Coral Triangle region of the Philippines, in addition to the records from the South Kuroshio region in Japan. After thorough morphological and molecular examinations, our findings reveal <em>C. yamaguchii</em> exists in the Coral Triangle. Traditional morphology including the pedalial canals, and microscopy of cnidocytes show nearly identical features between Japan’s and the Philippines’ cubomedusae. Remarkably, molecular analyses using cytochrome oxidase I (<em>cox1</em>) and ribosomal RNA (<em>16S</em>), revealed subtle divergence between Philippine and Japan’s <em>C. yamaguchii</em> (p-distances: <em>cox1</em>=0.04–0.05; <em>16S</em>=0.03–0.11; patristic distances: <em>cox1</em>= 0.02–0.02; <em>16S</em>= 1.90–5.20; <em>p</em>-values for both markers and distance values = &lt;0.01). Phylogenetic analyses also confirmed the clade for <em>C. yamaguchii</em> from Japan is distinct from the Philippine clade with moderate to strong branch supports (&gt; 90 %) while haplotype analyses indicated mutations separating Philippine <em>C. yamaguchii</em> from Japan’s specimens and other <em>Chironex</em> species. Further, the genetic markers and morphological identification were inconsistent, with <em>C. yamaguchii</em> from Japan and the Philippines appearing as distinct species in species-delimitation assessments using Assemble Species by Automatic Partitioning and Multi-rate Poisson Tree Processes. With these outcomes, we classified Philippine <em>C. yamaguchii</em> as putative cryptic species, awaiting clarification on possible reproductive isolation of this cubozoan. Our integrative approach resolved the taxonomic uncertainty, and solidified occurrence of <em>C. yamaguchii</em> in the Coral Triangle. This study emphasizes the importance of combined morphological and molecular analyses for accurate species identification in Cubozoa.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"82 ","pages":"Article 104033"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143178520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamics of biogeomorphology and CO2 sequestration in Jiangsu’s coastal salt marshes in East China following Spartina alterniflora invasion during 20112022","authors":"Zeng-Feng Li ,&nbsp;Ke-Hua Zhu ,&nbsp;Wei Zhao ,&nbsp;Hua-Yu Chen ,&nbsp;Zeng Zhou ,&nbsp;Zhen-Ming Ge","doi":"10.1016/j.rsma.2025.104052","DOIUrl":"10.1016/j.rsma.2025.104052","url":null,"abstract":"<div><div>Coastal wetland ecosystems are important blue carbon sinks that are vulnerable to human activity, geographical changes, and ecological invasion. China’s coastline has been invaded by <em>Spartina alterniflora</em> stemming from its artificial introduction (Jiangsu Province is a hotspot). Understanding the bio-geomorphic changes and carbon dynamics in invaded coastal ecosystems is of great significance. In this study, a coupled model was established and validated to explore vegetation community dynamics, topographical changes, and CO₂ fluxes in Jiangsu Province coastal salt marshes from 2011 to 2022. Both the measured and modeled results showed that the total vegetation area of the salt marshes continued to increase during the last decade, and the <em>S. alterniflora</em> area increased rapidly from 88.79 to 120.51 km², accounting for 73.52 %. The area dominated by native <em>Phragmites australis</em> increased slightly, whereas that dominated by <em>Suaeda glauca</em> decreased rapidly. The simulated sedimentation rates in the salt marshes generally matched the monitored data in the northern and central regions of the Jiangsu coastline. The <em>S. alterniflora</em> invasion promoted flat accretion due to its rapid range expansion and strong sediment-trapping ability. The model described the variations in the CO₂ fluxes of different vegetation types in salt marshes on daily, monthly, and annual scales. The calculation of gross CO₂ sequestration demonstrated that Jiangsu’s coastal salt marshes possess robust carbon sink capabilities, with average amounts of 289,727.66 TC year⁻¹ of gross primary production (GPP) and 193,440.07 TC year⁻¹ of net ecosystem exchange (NEE). <em>S. alterniflora</em> marshes were the primary contributors to GPP (∼87 %) and NEE (∼88 %). Our results are helpful for assessing or predicting the effects of invasive species on the bio-geomorphic changes and carbon sink capacities of coastal wetlands, as a deliberate management strategy for invasive species control.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"82 ","pages":"Article 104052"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143179546","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}

{"title":"Sediment quality evaluation in a strategic port zone: Application of Artemia franciscana and Emerita analoga in Callao Bay, Peru","authors":"Lorena Alvariño ,&nbsp;Luz Castañeda ,&nbsp;Grober Panduro ,&nbsp;Thiago Machado da Silva Acioly ,&nbsp;Diego Carvalho Viana ,&nbsp;José Iannacone","doi":"10.1016/j.rsma.2025.104039","DOIUrl":"10.1016/j.rsma.2025.104039","url":null,"abstract":"<div><div>The ocean, as the largest continuous planetary ecosystem, hosts a vast array of organisms spanning different trophic levels, forming intricate food webs. However, escalating coastal development and natural resource exploitation pose significant risks, particularly pollution, leading to declines in plant and animal populations and habitat degradation. This study aimed to investigate the toxicity of marine sediment quality from Callao Bay, Peru, on marine crustaceans (<em>A. franciscana</em> and <em>E. analoga</em>), examining contamination levels, site-specific effects, and seasonal variability. Four sampling areas were considered and georeferenced using GPS (PA1 = Naval School, PA2 = Peruvian Marine Institute, PA3 = Callao Pier, and PA4 = San Lorenzo Island). Toxicity bioassays were conducted in four seasons (fall, winter, spring, and summer), with physicochemical parameters measured <em>in situ</em> (temperature, pH, salinity, and conductivity). Sediment samples exhibited significant variations in toxicity levels and organism responses. <em>E. analoga</em> showed the highest sensitivity to sediment toxicity compared to <em>A. franciscana</em>, particularly in winter, suggesting its potential as an indicator species for assessing environmental risks. The Pacific sand crab displayed elevated mortality rates at sites PA4 and PA3, as evidenced by higher LC₅₀ values. Overall, these findings underscore the complex relationship between environmental factors, sediment quality, and organism responses, emphasizing the need for comprehensive monitoring and management strategies to safeguard marine ecosystem health.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"82 ","pages":"Article 104039"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143178519","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}

{"title":"River discharge - tide interactions and tide propagation in the mesotidal tropical estuary of the Van Uc river, Red River delta, Vietnam","authors":"J. Pénicaud ,&nbsp;M. Herrmann ,&nbsp;F. Toublanc ,&nbsp;V.D. Vinh ,&nbsp;S. Ouillon","doi":"10.1016/j.rsma.2025.104029","DOIUrl":"10.1016/j.rsma.2025.104029","url":null,"abstract":"<div><div>This study documents the hydrodynamics of the Van Uc estuary, one of the main distributaries of the Red River in Vietnam, examining the roles of river discharge and tides on the hydrodynamics of this mesotidal estuary. Hourly discharge and water level data from two stations located respectively in the estuary and near shore are used to study the tidal propagation within the estuary. The results show that the estuary is flood dominated, i.e. with a shorter flood (11 h) than ebb period (14 h), more pronounced for high river discharge and for spring tide (10 h vs 15 h). A tidal range damping is found in the upstream estuary, also increasing with the river discharge and the tidal amplitude (r &gt; 0.50, p &lt; 0.01). Spring tides strongly increase the difference between the maximum inflowing and outflowing velocities and the duration of the flood currents (r = 0.25, p &lt; 0.01). A high river discharge reduces the maximum inflow velocity, decreases the duration of the flood currents and increases the outflow duration (from 9 h to no flood current). It shifts the time of in- to out-flow reversal closer to high tide, and the out- to in-flow reversal from mid-flood to late flood. The characterization of tidal propagation contributes to improve the understanding of the behavior of this estuary, providing insights for further studies focusing on hydrodynamics and sediment transport.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"82 ","pages":"Article 104029"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143178523","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}

{"title":"Polyunsaturated fatty acid biosynthesis in marine ectotherms with different trophic levels under a global warming scenario: Interdisciplinary implications for the marine food chain, sustainable aquaculture, and human nutrition","authors":"Ángel Urzúa ,&nbsp;Marina Gebert","doi":"10.1016/j.rsma.2025.104048","DOIUrl":"10.1016/j.rsma.2025.104048","url":null,"abstract":"","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"82 ","pages":"Article 104048"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143179543","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}