Regional Studies in Marine Science最新文献

{"title":"Single-use plastic free islands: The case study of Donousa","authors":"Irina Kandylioti,&nbsp;Elefteria Psillakis","doi":"10.1016/j.rsma.2025.104151","DOIUrl":"10.1016/j.rsma.2025.104151","url":null,"abstract":"<div><div>This study investigates the impact of the four-year cleaning and awareness raising program implemented on Donousa, the first island in Greece to ban single-use plastics. Despite the relatively low marine macro-litter recorded levels, approximately 90 % of the collected items were composed of artificial polymer materials. According to the plastic’s Clean Coast Index analysis, the surveyed beaches transitioned from “very clean” or “clean” state in 2018 to a “moderate” state in 2021, mostly influenced by items transferred by sea currents, like plastic fragments ≥ 2.5 cm, which ranked as the primary litter type on Donousa. While most of the collected marine litter were of uncertain origin (55.7 %), land-based sources (2.5 %) found to be the least prominent, with fishing activity (16.8 %) and beach users (26.0 %) contributing significantly. Regarding the single-use plastic (SUP) items, that the program specifically targeted to reduce by transitioning to alternative options, their contribution to the total plastic marine litter load decreased by 11.2 % by the end of the program, with plastic bottles nearly eliminated. Notably, beach S₄ recorded a 34.6 % reduction in SUPs_. However, challenges persist with item categories such as caps/lids, cigarette butts and plastic bags, highlighting the urgency for more drastic preventive measures and coordinated interventions on a larger scale.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"85 ","pages":"Article 104151"},"PeriodicalIF":2.1,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759964","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":"Long-term trends in eutrophication in the inner part of Tokyo Bay, Japan, from 1998 to 2023","authors":"Shinji Hashimoto ,&nbsp;Kie Mizuno","doi":"10.1016/j.rsma.2025.104153","DOIUrl":"10.1016/j.rsma.2025.104153","url":null,"abstract":"<div><div>Nutrient loading is a critical issue in coastal waters that leads to eutrophication and anoxic water masses and impacts production in fisheries. In this study, therefore, long-term and seasonal variations in the eutrophication index (EI) using dissolved inorganic nitrogen (DIN), dissolved inorganic phosphorus (DIP), and chemical oxygen demand (COD) were investigated from 1998 to 2023 in the inner part of Tokyo Bay. Furthermore, the contribution of DIN, DIP, and COD to eutrophication was analyzed. The DIN concentrations showed a significant long-term decreasing trend, whereas DIP and COD showed no trend. EI also showed no long-term trend. The DIN and DIP concentrations showed a significant negative correlation with salinity, suggesting that the DIN and DIP concentrations in the inner part of Tokyo Bay were influenced by river water. COD showed a significant positive correlation with chlorophyll <em>a</em> concentration, suggesting that the COD in the inner part of Tokyo Bay was largely caused by endogenous factors. The EI was higher during the seasons with higher DIN and DIP concentrations and a lower salinity. The EI in the inner part of Tokyo Bay appeared to be higher during the season and at locations which the influence of river water was greater. The highest contribution to the EI was found for COD (&gt; 40 %), followed by DIN and DIP, suggesting that COD is an important factor in the eutrophication process.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"85 ","pages":"Article 104153"},"PeriodicalIF":2.1,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734707","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":"Richness of the exploited species in the octopus fisheries of the Gulf of Mexico","authors":"Otilio Avendaño ,&nbsp;Celso Cedillo ,&nbsp;Álvaro Roura ,&nbsp;Jorge A. López-Rocha ,&nbsp;Ángel F. González ,&nbsp;Iván Velázquez-Abunader ,&nbsp;Jesús Miguel Soto-Vázquez ,&nbsp;Ángel Guerra","doi":"10.1016/j.rsma.2025.104149","DOIUrl":"10.1016/j.rsma.2025.104149","url":null,"abstract":"<div><div>A wide variety of octopus species are commercially harvested in artisanal fisheries, but official landing data are still limited. This study thoroughly examined landings from 10 ports across four sampling operations to evaluate the species richness of octopuses marketed in the southern Gulf of Mexico (GoM). We selected a total of 61 specimens for morphological and meristic analysis and conducted COI genetic identification on 11 specimens that exhibited ambiguous morphological traits. We identified two genera and seven octopus species by integrating morphometric and genetic methods. The Chao richness index suggests that at least nine species can be captured in southern GoM fisheries. Our combination of field identifications and literature reviews revealed four target species: <em>Octopus maya</em>, <em>O. americanus</em>, <em>O. insularis</em>, and <em>Callistoctopus furvus</em>. Additionally, we found two incidental species, <em>Amphioctopus burryi</em> and <em>O. hummelincki</em>, and three discarded species: <em>O. briareus</em>, <em>Macrotritopus defilippi</em>, and <em>O. joubini</em>. These findings highlight the multi-species composition of the octopus fishery in the region, revealing greater diversity than is currently recognised in management plans. The results underscore the need to revise management strategies to account for this biodiversity, thereby ensuring the sustainable exploitation of these valuable resources.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"85 ","pages":"Article 104149"},"PeriodicalIF":2.1,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725729","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":"Geochemical assessment of surface sediments in Tabarka's coastal ecosystem: An integrative analysis of trace metals and nutrient loading","authors":"Maissa Naouar ,&nbsp;Samira Melki ,&nbsp;Salima Dakhli ,&nbsp;Sarra Hechmi ,&nbsp;Zaineb Louati ,&nbsp;Moncef Gueddari","doi":"10.1016/j.rsma.2025.104150","DOIUrl":"10.1016/j.rsma.2025.104150","url":null,"abstract":"<div><div>In coastal Mediterranean regions the accumulation of contaminants in marine sediments is driven by the combined pressures of anthropogenic activities and environmental settings.This study investigates the influence of trace metals (TMs), total organic carbon (TOC), and nutrients, including total nitrogen (TN), from the El Kebir River on sediment quality in Tabarka's coastal ecosystem. In May 2024, we collected 24 surface sediment samples for geochemical and mineralogical analysis. The average concentrations of trace metals in the sediments were as follows: Fe (25,881 mg.kg⁻¹), Cu (9.45 mg.kg⁻¹), Zn (81.16 mg.kg⁻¹), Pb (35.70 mg.kg⁻¹), and Ni (44.45 mg.kg⁻¹). Average TOC content was 0.93 % while TN was only detected at riverine stations ranging from 0.3 % to 0.52 %. Pollution indices including the Pollution Load Index (PLI = 0.66), Contamination Factor (CF) for Pb = 1.78 (moderate contamination), Geoaccumulation Index (Igeo), and the ecological Risk Index (RI) = 10.14 (low ecological risk), indicated that the area can be classified from unpolluted to moderately polluted. The TN/TOC ratio suggests a mixed origin of terrestrial and marine organic matter where higher values (0.12 – 0.15) are likely due anthropogenic TN inputs. The Pearson correlation coefficient (r) analysis reveals good positive correlations (r &gt; + 0.5) between trace metals and organic matter (TOC, TN), emphasizing the anthropogenic nature of this contamination. Principal component analysis (PCA) revealed two dominant sources of contamination linked to wastewater discharge and rainwater drainage. While results suggest moderate contamination level, continued accumulation of trace metals and nutrients could alter ecosystem functioning and exacerbate long-term ecological degradation.These findings emphasize the apparent need for urgent measures to improve wastewater treatment and pollution control to protect the coastal environment of Tabarka.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"85 ","pages":"Article 104150"},"PeriodicalIF":2.1,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715666","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 changes between two years in macrobenthic invertebrate communities in four sub-tropical Australian estuaries","authors":"Muhammad M. Islami ,&nbsp;Adam Davey ,&nbsp;Stephen D.A. Smith ,&nbsp;Victoria J. Cole ,&nbsp;Rachel Przeslawski ,&nbsp;Kirsten Benkendorff","doi":"10.1016/j.rsma.2025.104138","DOIUrl":"10.1016/j.rsma.2025.104138","url":null,"abstract":"<div><div>Estuaries provide critical ecosystem services but are threatened by natural and human pressures. Assessing their ecological condition is essential to evaluate future change. This study aimed to determine the biodiversity of macrobenthic invertebrates and potential environmental drivers in four estuaries between two timepoints. Following the significant 2022 flood events on the north coast of NSW Australia, we used benthic cores to sample the macrofauna in 2023, replicating a baseline survey undertaken in 2007. Four replicate samples were taken at three tidal heights (all &lt;1 m) on sand banks in the mid-estuary zone at Brunswick, Sandon, Corindi and Bellinger Rivers. Benthic macroinvertebrates (&gt;1 mm) were sorted, identified, counted and categorised into functional groups. The abundance and species richness was significantly lower in 2023 compared to 2007. Macrobenthic diversity and community composition showed significant variation between years, among estuaries. The bivalve <em>Mysella vitrea</em> (Lasaeidae) was the most abundant species, primarily explaining the dissimilarity between years. Deposit feeders dominated the functional groups, but their percentage was lower in 2023 compared to 2007. Differences in the environmental condition at the sites between two years reflect higher rain run-off in 2023, including significantly lower salinity and higher turbidity. Distance-based linear modelling showed that turbidity correlated significantly with the changes in community structure at the family level. The BEST model included a mix of physicochemical parameters, turbidity and % organic matter and explained 94.8 % of the variation in community structure, suggesting that freshwater and sediment run-off may influence macrobenthic communities in these estuaries. Results from this study support previous findings highlighting the problem of lack of data to document shifting baselines and the need for regular monitoring of estuarine ecosystems.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"85 ","pages":"Article 104138"},"PeriodicalIF":2.1,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715669","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":"A seal’s tale: de novo colonization of an intertidal sandbar in a highly anthropized harbor by the Harbor and Grey seals","authors":"Laurent Seuront ,&nbsp;Christophe Luczak ,&nbsp;Jean-Luc Bourgain","doi":"10.1016/j.rsma.2025.104144","DOIUrl":"10.1016/j.rsma.2025.104144","url":null,"abstract":"<div><div>In the eastern English Channel, both harbor (<em>Phoca vitulina</em>) and grey seals (<em>Halichoerus grypus</em>) faced near extinction in the late 19th and early 20th centuries due to hunting and perceptions of their detrimental impact on local fisheries. Conservation efforts, including a 1972 hunting ban and reinforced management strategies, led to the recovery of these species, particularly in sheltered bays and estuaries. Despite the sensitivity of these species to anthropogenic disturbances, since 2010 <em>P. vitulina</em> and <em>H. grypus</em> have increasingly been observed hauling out on a tidal sandbar in Boulogne-sur-Mer harbor, a site heavily impacted by agricultural, urban and industrial runoffs, as well as fishing, shipping and recreative boating. Seal presence was opportunistically recorded on this haul-out site from January 2014 to December 2023. <em>P. vitulina</em> was consistently observed from 2016. <em>H. grypus</em> were rare until 2017, and subsequently increased with a clear seasonality, i.e. more abundant during the summer and absent from November to February. Trends in maximum haul-out numbers showed a significant linear increase at a rate of nearly 5 % per year from 2014 to 2020 before reaching a steady state from 2020 to 2023. In contrast, <em>H. grypus</em> maximum abundances increased exponentially at a yearly rate of 37 % over the course of our survey. These results suggest that the sandbars within Boulogne-sur-Mer harbor may hold exceptional patrimonial value, despite significant anthropogenic disturbances. They also warrant the need for further studies to understand the consequences of anthropogenic disturbances on the conservation and management of seal populations.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"85 ","pages":"Article 104144"},"PeriodicalIF":2.1,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143705140","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":"A prospective study on the biodegradation of petroleum hydrocarbons mediated by selected marine bacterial isolates","authors":"Umaima Hamed Al Hoqani ,&nbsp;Syed Najmul Hejaz Azmi ,&nbsp;Jayachandran Vavolil P ,&nbsp;Huda Sultan Al Habsi ,&nbsp;Salla Hemadri Reddy ,&nbsp;Pankaj Sah ,&nbsp;Jokha Salim Al Harthi ,&nbsp;Zainab Nasser Bani Saad ,&nbsp;Zainab Saif Al Nabhani ,&nbsp;Qamar Uddin Ahmed ,&nbsp;Md. Abdur Rashid Mia ,&nbsp;Kamal Abdelrahman ,&nbsp;Mohammed S. Fnais","doi":"10.1016/j.rsma.2025.104143","DOIUrl":"10.1016/j.rsma.2025.104143","url":null,"abstract":"<div><div>Petroleum hydrocarbons are an indispensable energy source and serve as a fundamental feedstock for petroleum oil refiners and petrochemical industries. The release of petroleum hydrocarbon pollutants into the environment is associated with anthropogenic activities during crude oil production, exploration, and transportation. The widespread petroleum hydrocarbons pollutants in the environment caused a major concern due to their bioaccumulation potential and harmful effect on the ecosystem. Nevertheless, such polluted environment with petroleum hydrocarbons is enriched with microorganisms that have the natural ability to utilize the petroleum hydrocarbons as a carbon source for their growth and metabolic activities. Therefore, this study focused on the isolation, molecular identification and characterization of bacterial isolates from seawater samples collected at the coastal area nearby oil Refinery Company in Oman. Six marine bacteria were isolated from the contaminated seawater and their taxonomical identification was performed based on 16S rRNA gene sequence. The degradation potential of bacterial isolates was assessed by growing them in F/2 medium supplemented with crude oil as a sole carbon source. Two bacterial isolates belonging to the genus <em>Niallia</em> showed the strongest growth (S1.5: 1.01 ± 0.27 and S2.1: 0.88 ± 0.23) and were subjected to further Gas Chromatography–Mass Spectrometry (GC-MS) analysis determining which n-alkanes in crude oil were degraded by the isolates. The GC-MS chromatogram indicated that S2.1 exhibited greater efficiency in degrading a higher number of carbon n-alkanes (C13-C34) com-pared to S1.5 (C13-C18). The t-test analysis confirmed the efficiency of S2.1 (t = 3.182; p &lt; 0.01) (93.61 ± 1.48 %) compared to S1.5 (86.08 ± 1.85 %). Molecular docking revealed robust binding affinities between selected n-alkanes and alkane hydroxylases, facilitating the subsequent degradation of n-alkanes in crude oil. The degradation potential of <em>Niallia</em> can be further exploited for the treatment of petroleum contaminated, especially with the incorporation of recent technological advancements.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"85 ","pages":"Article 104143"},"PeriodicalIF":2.1,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715665","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":"Microplastic contamination in Rupsha River of Bangladesh and its impacts on fish species","authors":"Ahmed Shakik ,&nbsp;Puja Brohomo,&nbsp;Md. Shahariar Kabir,&nbsp;Md. Saiful Islam,&nbsp;Mahmudul Hasan Mizan","doi":"10.1016/j.rsma.2025.104130","DOIUrl":"10.1016/j.rsma.2025.104130","url":null,"abstract":"<div><div>Microplastics have emerged as a significant environmental concern, with their ubiquitous presence and potential adverse impacts on aquatic ecosystems. Microplastics (MPs) are constantly increasing, including aquatic food and aquatic animals. Therefore, this study aimed to assess the extent of microplastic contamination in a segment of Rupsha River, Bangladesh, and its impacts on the fish species that eventually enter the human food cycle. The 18-kilometer stretch of the Rupsha River showed concerning results in the concentration of microplastic ranging from <strong>0.67 ± 0.38</strong> to <strong>8.67 ± 0.38 particles per liter</strong>. Microplastics of various shapes, sizes, and colors were detected. Four fish species were tested (Rohu, Mystus, Singhi, Taki) according to the abundance and human consumption, which revealed microplastic ranged from <strong>5.00 ± 0.54</strong> to <strong>7.90 ± 0.95 particles per fish</strong>, with Rohu the highest (<strong>7.90 ± 0.95 particles per fish</strong>) number and Mystus the lowest (<strong>5.00 ± 0.54 particles per fish</strong>) and <strong>38.61 ± 4.77</strong> to <strong>125.34 ± 13.80 particles per kilogram of fish</strong> respectively. These results pointed out a correlation between fish mass and microplastic concentration for pooled samples. Fourier Transform Infrared (FTIR) spectroscopy was used to identify types of microplastic and revealed <strong>polypropylene, polyethylene, polyvinyl chloride and nylon</strong>. This study highlights the emergence of microplastic hazards in the Khulna Region of Bangladesh, which has a vast resource of rivers and fish.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"85 ","pages":"Article 104130"},"PeriodicalIF":2.1,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715667","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":"Prediction of potential fishing grounds for chub mackerel in the Northwest Pacific utilizing a combination of multivariable Gaussian mixture model and Bayesian approach","authors":"Fenghua Tang ,&nbsp;Yaoji Ba ,&nbsp;Shengmao Zhang ,&nbsp;Shenglong Yang ,&nbsp;Guoqing Zhao ,&nbsp;Zuli Wu ,&nbsp;Jiasheng Li ,&nbsp;Xuesen Cui","doi":"10.1016/j.rsma.2025.104139","DOIUrl":"10.1016/j.rsma.2025.104139","url":null,"abstract":"<div><div>Chub mackerel is an economically important pelagic fish species in the Northwest Pacific Ocean. Accurate forecasting of fishing grounds can greatly improve the fishery production capacity and support conservation-focused fisheries management. This study utilized China's fishery catch data for chub mackerel in the Northwest Pacific from 2014 to 2019, along with various marine environmental factors, including sea surface temperature (SST), chlorophyll concentration (CHL), eddy kinetic energy (EKE), sea surface height anomaly (SSHA), and the strength of the SST gradient (SSTG), to develop a predictive model for fishing grounds. Initially, two Gaussian mixture distributions were simulated to ascertain the distributions of environmental factors for \"true\" and \"false\" fishing grounds, respectively. Subsequently, a fishing ground prediction model was constructed using a Bayesian approach informed by the parameters of the Gaussian mixture models. Additionally, a novel training dataset division scheme was established based on cross-validation results to enhance the model's training and testing accuracy, as well as its generalization capability. The forecasting model was ultimately validated against actual fishery data collected from April to November 2020, revealing that the predicted fishing ground locations closely aligned with the actual observed locations for each month. The area under the curve (AUC) values ranged from 0.667 to 0.870, with an average AUC of 0.766 and a variance of 0.076, indicating a reasonable level of accuracy in the model's forecasts. The findings of this study contribute to a deeper understanding of the influence of oceanographic conditions on chub mackerel and offer a novel approach for predicting its fishing grounds.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"85 ","pages":"Article 104139"},"PeriodicalIF":2.1,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686288","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":"Temporal variability of microplastics contaminant ingested by striped barnacles Amphibalanus amphitrite in tidal flat of the Tsurumi River estuary, Tokyo Bay Area, Japan","authors":"Eduardo Estevan Barrientos ,&nbsp;Hiraku Tanoiri ,&nbsp;Masashi Yokota","doi":"10.1016/j.rsma.2025.104127","DOIUrl":"10.1016/j.rsma.2025.104127","url":null,"abstract":"<div><div>Microplastic pollution is an emergent and serious environmental threat to the aquatic environment, hence, understanding their fate, transportation and concentrations is vital for addressing such threat. The knowledge of bio-contamination of microplastics in continuous time scale within specific location area is limited. Therefore, in this study, we investigated the temporal variability of microplastics contaminant ingested by striped barnacle <em>Amphibalanus amphitrite</em> over a one-year period in the Tsurumi River Tidal Flat within the Tokyo Bay area, Japan. The overall mean MPs concentration in striped barnacles was 14.07 ± 1.44 MPs /wet weight (g⁻¹) or 3.88 ± 0.42 MPs/ individual. The highest concentration was observed in November (26.60 ± 7.07 MPs number/body weight (g⁻¹) or 8.90 ± 2.34 MPs/ individual), whereas, the lowest concentration was observed in July (4.53 ± 1.78 MPs number/body weight (g⁻¹) or 1.50 ± 0.60 MPs/ individual). Statistical analysis detected significant differences in the overall MPs concentration (p = 0.005). The dominant type of MPs was fragment (66 %), followed by fiber (17 %), pellet (12 %) and film (5 %). A total of 23 polymer types were identified with µFT-IR. Polyethylene was the most abundant polymer type with 33 % of the total particles identified, followed Polyamide with 13 %, Melamine Urea-Formaldehyde with 12 %, Phenol Formaldehyde with 10 % and Polyether 7 % respectively. The results obtained in this study confirms the exposure of microplastics contaminant to stripped barnacles in their natural environment and highlights that concentration values fluctuate over time even within a specific area.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"85 ","pages":"Article 104127"},"PeriodicalIF":2.1,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686320","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}