Regional Studies in Marine Science最新文献

{"title":"A baseline toxicity assessment of sediment geochemistry, potentially toxic elements contamination, and ecological risk in sediment profiles of the Bay of Bengal coast, Bangladesh","authors":"Md. Saiful Islam ,&nbsp;Abdullah Al Bakky ,&nbsp;Nor Aida Mahiddin ,&nbsp;Md. Towhidul Islam ,&nbsp;Uttam Biswas Antu ,&nbsp;Zulhilmi Ismail ,&nbsp;Tusar Kanti Roy ,&nbsp;Mahmudul Hasan ,&nbsp;Kazi Aminul Islam ,&nbsp;Avijit Sarkar ,&nbsp;Khalid A. Ibrahim ,&nbsp;Abubakr M. Idris","doi":"10.1016/j.rsma.2025.104118","DOIUrl":"10.1016/j.rsma.2025.104118","url":null,"abstract":"<div><div>The marine ecosystems of the Bay of Bengal Coast, Bangladesh have been significantly influenced by anthropogenic activities in recent times. However, the contamination of potentially toxic elements (PTEs) in sediment profiles in the Bay of Bengal, Bangladesh has rarely been stated. A 150-cm-long sediment core was collected to assess the quality of sediments in terms of PTEs contamination and ecological risk. The ranges of PTEs in sediments were 6.05–104.2, 9.31–81.8, 6.57–112.9, 1.98–17.0, 0.48–6.49, 1.85–72.5, 12080–35365, 90.8–810.2, and 11.1–109.5 mg/kg, respectively for Cr, Ni, Cu, As, Cd, Pb, Fe, Mn, and Zn. The overall mean concentrations of Cu, As, Cd, and Pb in sediments were remarkably higher than the standard value, indicating their contamination. Considering the depths of sediment core (0–20, 20–100, and 100–150), potential ecological risk index (RI) were observed as 299.2, 199.5, 151.7 for Cox's Bazar, 420.7, 313.7, and 161.5 for Chittagong, 210.6, 211.5, and 147.8 for Meghna Estuary, and 195.4, 133.6, and 89.1 for the Sundarbans area. The geochemical distribution of PTEs in the exchangeable fraction (F1) of sediments followed in the descending order of Cd &gt; Pb &gt; Ni &gt; Zn &gt; Cu &gt; Mn &gt; As &gt; Fe &gt; Cr, indicate that Cd and Pb had adverse biological toxicity effects. Results of enrichment factor (EF), index of geoaccumulation (<em>I</em>_geo), contamination factor (CF), and sediment quality guidelines (SQGs) suggested that the sediment profiles were considerably degraded by some elements i.e., Cu, As, Pb, and Zn. The multivariate statistical technique indicated that most of the analyzed PTEs were enriched in sediments from anthropogenic activities.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"84 ","pages":"Article 104118"},"PeriodicalIF":2.1,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143577054","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":"Chemical composition and biofilm inhibition potential of selected biofouling organisms from coastal waters of western Sri Lanka","authors":"R.L. Weerasinghe ,&nbsp;S.D.M. Chinthaka ,&nbsp;R.R.M.K.P. Ranatunga","doi":"10.1016/j.rsma.2025.104120","DOIUrl":"10.1016/j.rsma.2025.104120","url":null,"abstract":"<div><div>There is limited knowledge of the physical and chemical properties of the biofouling organisms in the coastal waters surrounding Sri Lanka. This study investigates the chemical diversity and environmental resilience of nine species of marine macrofouling organisms through secondary metabolite-induced effects on biofilm formation. The anti-settlement assay revealed that <em>Schizoporella errata, Botrylloides violaceus, Callyspongia diffusa, Halichondria panicea</em> and <em>Acanthella cavernosa</em> showed significant resistance to <em>Escherichia coli</em> settlement and biofilm formation within the first 12 h (OD₆₀₀ &lt; 0.1). Following gas chromatographic and mass spectrometry (GC-MS) analysis, antimicrobial compounds such as dodecanoic acid, methyl palmitate, β-caryophyllene, hentriacontane geraniol and β-asarone were detected in these species.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"84 ","pages":"Article 104120"},"PeriodicalIF":2.1,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143577056","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":"Distribution and pollution assessment of heavy metals in seawater, surface sediments and marine organisms in Lianyungang offshore, China","authors":"Qingjun Gao ,&nbsp;Nan Wang ,&nbsp;Lihui Xiang ,&nbsp;Qianqian Sui","doi":"10.1016/j.rsma.2025.104111","DOIUrl":"10.1016/j.rsma.2025.104111","url":null,"abstract":"<div><div>The heavy metal pollution due to human activities has attracted considerable attention and may lead to serious environmental problems. Multiple indices were used to analyze the spatial distribution and pollution status of heavy metals in surface sediments, seawater and marine organisms in Lianyungang offshore. The results showed that the quality of all heavy metals in seawater and sediments complied with the first-class water quality standard (GB 3097–1997) and marine sediment quality standard (GB 18668–2002). Heavy metals in the seawater were in a clean state and at a low potential ecological risk. Spatial distribution of heavy metals in the sediments was mainly controlled by mean grain size and most of the stations were at a low potential ecological risk. The presence of mercury and cadmium represents a significant ecological risk due to their strong biological toxicity. Although the concentration of heavy metals in seawater is often very low, but the pollutants in the seawater can be concentrated step by step in the higher level of organisms through the food chain. The majority of heavy metals exhibited a <em>BWAF</em> value exceeding 1, indicating that the organisms possess a notable capacity for enrichment from seawater. Therefore, it’s necessary to safeguard the quality of seawater, particularly in light of its potential impact on seafood consumption.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"84 ","pages":"Article 104111"},"PeriodicalIF":2.1,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143593196","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":"Massive arrivals of egg capsules of the gastropod Pachycymbiola brasiliana and the hydroid Amphisbetia operculata in the beaches of the Southwestern Atlantic Ocean","authors":"Laura Schejter ,&nbsp;Gabriel Genzano ,&nbsp;Marina Güller ,&nbsp;Reinaldo A. Maenza ,&nbsp;Diego G. Zelaya","doi":"10.1016/j.rsma.2025.104117","DOIUrl":"10.1016/j.rsma.2025.104117","url":null,"abstract":"<div><div>The phenomenon of subtidal organisms arriving, accumulating, and depositing onto the beach is not unusual, although they have been seldom documented in South America, especially regarding marine invertebrates. In this study twelve major events that happened at the Atlantic South American shorelines between 35° and 38°S during the austral summer of 2022–2023 were investigated. The arrivals were mainly composed by egg capsules of the gastropod <em>Pachycymbiola brasiliana</em> and by colonies of the hydroid <em>Amphisbetia operculata</em>. Prior to these events, persistent winds from the north/northeast quadrant that promoted moderate to strong currents toward the coastline were recorded. The compilation of other historic events reveals that the 2022–2023 are probably the largest and best documented events involving these species. Great mortality of recruits of the gastropod <em>Pachycymbiola brasiliana</em> may have consequences for the species as well as other members of the local assemblages and food webs. Contrarily, to established populations of the hydroid <em>Amphisbetia operculata,</em> these events pose minimal biological or ecological threats. Unpleasant subsequent conditions for tourists at the beaches are caused by the wrack. This contribution also draws attention to the lack of legislation in Argentina regarding how this wrack should be removed from the beaches.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"84 ","pages":"Article 104117"},"PeriodicalIF":2.1,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143577057","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":"Reproductive cycle of Mytilus galloprovincialis (Lamarck, 1819) and Perna perna (Linné, 1758) for sustainable exploitation of natural mussel beds in Massa-Tifnit (On the Moroccan Atlantic Coast)","authors":"Lamia Laaraj ,&nbsp;Hafida Bergayou ,&nbsp;Oum Keltoum Belhsen ,&nbsp;Abdellatif Moukrim","doi":"10.1016/j.rsma.2025.104103","DOIUrl":"10.1016/j.rsma.2025.104103","url":null,"abstract":"<div><div>The reproductive cycles of the mussel species <em>Mytilus galloprovincialis</em> and <em>Perna perna</em>, were studied at three sites on the Atlantic coast of southern Morocco (Sidi R′bat, Douira and Tifnit). Monitoring of temporal variations in the condition index, gonadal index and histological analyses of the gonadal maturity stages and sex ratio was conducted monthly, from January to December 2018.</div><div>The results indicate that the sex ratio favored males in both species, with a maximum ratio of 1.9: 0.53 for <em>M. galloprovincialis</em> at Tifnit; in contrast, the <em>P. perna</em> population at Tifnit presented a female-dominated ratio of 0.84:1.19. The spawning event for <em>M. galloprovincialis</em> occurred over three periods: two primary spawning periods in spring and autumn, and a secondary period in winter. <em>P. perna</em> spawns all year, with a primary spawning period from spring to autumn and several secondary spawning events. A small number of individuals (undifferentiated) were found in the sexual resting stage, recorded mainly in July and August. The variation in the condition index and gonadal index confirmed the periods of reproduction and the nutritive status of the bivalves.</div><div>The aim of this work is to contribute to a better understanding of mytiliculture potential by studying the reproductive cycle and recruitment of <em>M. galloprovincialis</em> and <em>P. perna</em> in their natural populations. Additionally, it supports the development of conservation and protection measures to sustain healthy populations and ensure sustainable fishing yields. Our results indicate that the mussel beds in this region possess several characteristics that make them suitable for aquaculture development.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"84 ","pages":"Article 104103"},"PeriodicalIF":2.1,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143547922","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":"Population structure and allometric patterns in mangrove horseshoe crab, Carcinoscorpius rotundicauda from the coastal area of Cox’s Bazar, Bangladesh","authors":"Farsia Naher ,&nbsp;Md. Nayeem Hossain ,&nbsp;Akbar John ,&nbsp;Md. Tanvir Hossain Tushar ,&nbsp;Zobair Alam Sunny ,&nbsp;Md. Tarek ,&nbsp;Shahida Arfine Shimul ,&nbsp;Saifuddin Rana ,&nbsp;Sk. Ahmad Al Nahid","doi":"10.1016/j.rsma.2025.104113","DOIUrl":"10.1016/j.rsma.2025.104113","url":null,"abstract":"<div><div>A study on population structure, morphological variation and allometric pattern of the mangrove horseshoe crab (<em>Carcinoscorpius rotundicauda</em>) was carried out in four sites (Dorianagar, Khurushkul, Moheshkhali and Rejukhal) in Cox’s Bazar, Bangladesh. Two methods (walk-through and gill netting) were used to collect horseshoe crabs. A total of 202 individuals were sampled, with a male-dominated sex ratio of 1.69:1. The results indicated significant differences in body weight (BW), prosomal width (PW), carapace length (CL), total length (TL), and telson length (TEL) among the sites and between sexes. Females exhibited larger morphometric measurements than males across all locations except Rejukhal, having the highest mean body weight in males (228.2 ± 29.2 g) and females (227.3 ± 44.5 g) of Dorianagar. Males of Rejukhal showed a lower mean body weight (165.42 ± 14.92 g) compared to females (154.20 ± 9.91 g), indicating some variability in trends. Size distribution analysis revealed that most individuals fell within the 13.0–14.9 cm PW range, in case of Khurushkul showing the highest density. Correlation analysis demonstrated significant positive relationships among key morphological traits, particularly between BW, PW, CL, and TL. The Principal Component Analysis (PCA) identified BW, PW, and TL as the most influential traits distinguishing between sexes, with PC1 explaining 73.8 % and 69.1 % of the variation in males and females, respectively. The Discriminant Function Analysis (DFA) further confirmed BW as a key trait for sex differentiation, achieving a 78.7 % accuracy rate in classification. Allometric growth analysis revealed negative allometry (b &lt; 3) in the TL-BW, PW-BW, and CL-BW relationships in males and females across sites, with notable exceptions in males of Khurushkul (PW-BW) and females of Dorianagar (CL-BW) displayed isometric growth (b = 3). However, TL-TEL relationship across all sites showed positive allometry (b &gt; 1) except that of Rejukhal where both males and females showed isometric growth (b = 1). These findings are anticipated to help determine the size variations among the individuals of <em>C. rotundicauda</em> in different sites of Cox’s Bazar and serve as a foundation for future research to compare different populations.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"84 ","pages":"Article 104113"},"PeriodicalIF":2.1,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143601283","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":"Impact of subsidy strategies on the optimization of container intermodal transport route selection","authors":"Yong Zhou ,&nbsp;Qirui Liu ,&nbsp;Shiyuan Zheng ,&nbsp;Qi Zhang","doi":"10.1016/j.rsma.2025.104115","DOIUrl":"10.1016/j.rsma.2025.104115","url":null,"abstract":"<div><div>To achieve carbon neutrality goal, addressing environmental impact of the transportation sector is crucial, and intermodal transport may be a good option. Therefore, government is trying to promote the development of intermodal transport by providing subsidies to lower the costs of clean transport modes. This paper primarily discusses how to establish uniform interprovincial subsidy standards for effective emission reduction policies following the government’s proposal of various subsidy policies, and explores how carriers can select the optimal routes under these policies. A bi-level model is established, with the upper-level model being the decision-making of subsidy policies to achieve the highest emission reduction benefits, while the lower-level one being the optimization of intermodal transport routes. Transportation demand in the Yangtze River Delta region, covering short and medium to long distances to Yangshan Port, is used as case studies to investigate the issue of intermodal transport route selection under four subsidy schemes. In both cases, subsidies for railway transport are used, which increases the proportion of railway in the optimal transport route and reduced carbon emissions. However, the two cases employ different types of subsidies, and the choice of subsidy type might be influenced by the varying distances of transport. It also discusses the impact of changes in waterway freight rates and carbon taxes on the scheme and route selection under these four subsidy schemes, aiding the government and carriers in better understanding the influence of subsidy policies on route selection and providing support for carbon emission reduction decisions.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"84 ","pages":"Article 104115"},"PeriodicalIF":2.1,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143576969","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":"No effect of the COVID-19 lockdown on predatory fish abundance in the Caño Island Biological Reserve, Eastern Tropical Pacific Ocean","authors":"Camila Valverde ,&nbsp;Marta Cambra ,&nbsp;Mario Espinoza","doi":"10.1016/j.rsma.2025.104107","DOIUrl":"10.1016/j.rsma.2025.104107","url":null,"abstract":"<div><div>The global COVID-19 lockdown offered a rare opportunity to evaluate human impact on nature. This study used Baited Remote Underwater Video Stations (BRUVS) to assess the effect of the COVID-19 lockdown on predatory fish in the Caño Island Biological Reserve, in the south Pacific of Costa Rica. Despite tourism's potential role in conservation, its impact remains debated due to the environmental degradation and behavioral changes associated with high tourism pressure. Negative binomial regressions revealed no link between the lockdown and fish abundance. PERMANOVA analysis showed no significant variation in the predator community structure due to the lockdown. Finally, Log Response Ratios indicated that less than half (39.4 %) of the predatory fish species varied during the lockdown. We recommend that fine-scale metrics be included in future research to fully understand the impact of tourism on marine species. This study highlights the importance of environmental factors in determining the abundance of predatory fish and provides insight into how marine tourism may be affecting some of the studied species.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"84 ","pages":"Article 104107"},"PeriodicalIF":2.1,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143577055","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 fluxes and mechanisms in a macro-tidal turbid estuary during typhoon events","authors":"Li Li ,&nbsp;Zhitong Su ,&nbsp;Ye Zhu ,&nbsp;Zixuan Li ,&nbsp;Zhiguo He ,&nbsp;Yuezhang Xia ,&nbsp;Haijing Shi ,&nbsp;Rasheed B. Adesina","doi":"10.1016/j.rsma.2025.104109","DOIUrl":"10.1016/j.rsma.2025.104109","url":null,"abstract":"<div><div>In turbid macro-tidal estuaries (MTE), typhoons interact with tides and high turbidity, significantly impacting the natural and social environments of the coastal zones. A tide-wave-sediment numerical model was built and validated for Hangzhou Bay (HZB), using reconstructed near-shore typhoon wind fields. The model incorporates wave-current coupling and water-sediment density coupling and considers fine sediment flocculation and fluid mud bottom boundary layer. Results show that the typhoon remarkably enhances wave-induced bottom stress but slightly increases current-induced bottom stress. Increased wave-induced bottom stress led to intensified sediment resuspension, subsequently increasing suspended sediment concentration (SSC) and SSF during the typhoon. Typhoon wind fields primarily impact sediment transport, with large wave impacts on both the south and north banks, while the effect of air pressure was negligible. The tide-induced net SSF was eastward. Residual currents magnitudes and SSC were positively correlated with typhoon intensity. Tide-surge nonlinear effects decrease the SSC. By decomposing the net SSF, the Euler transport term (<em>T</em>₁) and the tidal trapping effect (<em>T</em>₄) were the main terms among 7 components. The winds promoted sediment transport mainly through <em>T</em>₁ and <em>T</em>₄. For wave-induced sediment transport, <em>T</em>₄ was the main term. The tide-surge nonlinear interaction suppressed surge-induced sediment transport through <em>T</em>₁ and tide-induced sediment transport through <em>T</em>₄. The findings reveal the mechanism of sediment transport during extreme weather conditions in macro-tidal turbid estuaries.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"84 ","pages":"Article 104109"},"PeriodicalIF":2.1,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143576968","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":"Carbon sequestration potential of Sonneratia apetala plantation forests in the Chakaria Sundarbans: Effects of stand age and structure","authors":"Mohammad Ismail ,&nbsp;Sujit Kumar Roy ,&nbsp;Tanmoy Dey ,&nbsp;Jayanta Kumar Basak ,&nbsp;Mohammad Ashik Arman Chowdhury ,&nbsp;Fayez Ullah ,&nbsp;Sajib Ahmed","doi":"10.1016/j.rsma.2025.104104","DOIUrl":"10.1016/j.rsma.2025.104104","url":null,"abstract":"<div><div>Coastal plantation ecosystems play a crucial role in combating global warming by serving as effective carbon sinks. <em>Sonneratia apetala</em> (Keora) is a fast-growing tree species that significantly influences local carbon sequestration rates, but still there is lack of knowledge about how this carbon sequestration rate changes with stand age and structure. So, we investigated how carbon stock changes across four different aged of <em>S. apetala</em> plantation forests (8, 16, 24, and 32 years) in the Chakaria Sundarbans. Twenty representative plots (20 m × 20 m) were selected from 4 different stand ages (8, 16, 24, and 32 years) using stratified random sampling design (SRSD) method. Soil organic carbon (SOC) content from 0 to 30 cm soil layers, aboveground biomass (AGB) and belowground biomass (BGB) were studied to calculate the total carbon stock (TCS). A positive correlation was observed between TCS and stand age. The TCS at the 8, 16, 24, and 32 years old plantation sites was 60.85, 109.73, 136.29, and 183.48 t ha⁻¹, respectively. The mean annual carbon accumulation rate (CAR) were 7.60, 6.86, 5.68, and 5.73 t ha⁻¹ year⁻¹ in these respective sites, indicated that the CAR significantly decreased with stand age. At the stand ages of 8, 16, and 24 years, soil organic carbon storage (SOCS) significantly outweighed total biomass carbon stock (TBCS), with percentages of 85.02 %, 60.68 %, and 55.65 % of TCS, respectively. However, at 32 years old stand, TBCS (54.77 %) exceeded SOCS (45.23 %). The TCS values were equivalent to 223.32, 402.71, 500.18, and 637.37 t ha⁻¹ CO₂ at 8, 16, 24, and 32 years old stands, respectively, revealed a significant potential for CO₂ sequestration. These findings can be used in the development of effective forest management strategies with restoring mangrove to maximize carbon storage potential in the southeastern coasts of Bangladesh, ultimately helping to reduce CO₂ gas emissions to combat adverse effect of climate change.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"84 ","pages":"Article 104104"},"PeriodicalIF":2.1,"publicationDate":"2025-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143547924","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}