Regional Studies in Marine Science最新文献

{"title":"Seasonal variability of trace metal accumulation in seagrass (Cymodocea rotundata) at the Dongsha Atoll, South China Sea","authors":"Kuo-Tung Jiann ,&nbsp;Heng-Yin Hsu ,&nbsp;Chung-Hsin Yuan ,&nbsp;Keryea Soong","doi":"10.1016/j.rsma.2025.104071","DOIUrl":"10.1016/j.rsma.2025.104071","url":null,"abstract":"<div><div>In this study, trace metal levels of seagrass (<em>Cymodocea rotundata</em>) were used as bioindicators to investigate the variability of trace metals in a remote atoll (Dongsha) on the continental slope of the South China Sea. Seagrass samples were collected (bi)weekly from December 2014 to March 2016, and water and sediment samples were also collected several times during the period. To assess the temporal variability of trace metals in this region, which is influenced by different monsoon-bearing atmospheric sources, especially anthropogenic ones, the concentrations of trace metals (Cd, Cu, Ni and Zn) in all three types of samples were determined. Among the different media, sediment and seagrass showed similar spatial variability in trace metal content. Water samples showed no discernible spatial or temporal trend for the particular elements. Our results showed that trace metal concentrations in seagrass collected during the northeast monsoon season (winter-spring) were on average 52 % higher for Cd, 28 % for Cu, and 17 % for Zn than those collected during the southwest monsoon season (summer-autumn). These results are consistent with atmospheric trace metal concentrations obtained during parts of the same study period. This implies that trace metal content in seagrass is not only influenced by local sources, but may also serve as an indication of atmospheric trace metal sources transported to the offshore Dongsha Atoll in the South China Sea.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"83 ","pages":"Article 104071"},"PeriodicalIF":2.1,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143379374","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":"Contamination, potential sources, and risk assessment of microplastics in surface waters of two public bathing beaches along the Northern Bay of Bengal","authors":"Md. Maheen Mahmud Bappy ,&nbsp;Md. Mofizur Rahman ,&nbsp;Md. Tareque Bhuiyan ,&nbsp;Mohammad Mahbubur Rahman ,&nbsp;Partho Banik ,&nbsp;As-Ad Ujjaman Nur ,&nbsp;Jimmy Yu ,&nbsp;Takaomi Arai ,&nbsp;Bilal Ahamad Paray ,&nbsp;Norhayati Ngah ,&nbsp;M. Belal Hossain","doi":"10.1016/j.rsma.2025.104067","DOIUrl":"10.1016/j.rsma.2025.104067","url":null,"abstract":"<div><div>Understanding microplastics (MPs) pollution and its associated risks in bathing beaches, particularly those characterized by heavy commercial trading, is essential for the protection of marine ecosystems and human health. Despite the global concern regarding MPs, contamination levels along the Bangladesh coast, especially on popular bathing beaches, remain largely unexplored. This study aimed to investigate the levels, characteristics, and associated risks of MPs at Patenga and Parki beaches along the Bay of Bengal coast. The results revealed that MPs concentrations ranged from 305.56 to 116.67 MPs/m³ at Patenga and from 250.00 to 83.33 MPs/m³ at Parki Beach, indicating significant differences in contamination levels between the two sites. The predominant characteristics of the MPs included violet coloration, fibrous structures, and sizes measuring less than 0.5 mm, with identified polymers such as PET, PP, PS, ABS, PE, and Nylon. The pollution load indexes (PLI) for both beaches exceeded 1, highlighting substantial risks to the marine ecosystem. The Coefficient of Microplastic Impact (CMPI) indicated varying degrees of impact, ranging from severe to minimal, while the polymeric risk evaluation (Hi) suggested considerable risks, particularly at Patenga. Furthermore, the MPs pollution risk index (PRI) values indicated a higher threat level at Patenga (H_Patenga = 7.9) compared to Parki (H_Parki = 1.9). The Microplastics Pollution Index (MPPI) further indicated a significant abundance of microplastics, with Patenga exhibiting higher levels than Parki. These findings led to the development of a conceptual model illustrating the sources and transport pathways of MPs, underscoring the urgent need for effective management strategies to mitigate MPs pollution and safeguard public health on these bathing beaches.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"83 ","pages":"Article 104067"},"PeriodicalIF":2.1,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420281","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":"Inland port ranking analysis considering port efficiency for sustainable port development: A case study","authors":"Yanjie Zhou,&nbsp;Xueqian Wang,&nbsp;Chenglin Hu,&nbsp;Tao Li","doi":"10.1016/j.rsma.2025.104062","DOIUrl":"10.1016/j.rsma.2025.104062","url":null,"abstract":"<div><div>Inland ports are important facilities for transferring cargo to the seaport along the New Maritime Silk Road. Inland port ranking will affect the port development decisions. This paper explores the inland port ranking along the Yangtze River considering the port efficiency. Firstly, we adopt the Data Envelopment Analysis (DEA) method to calculate the port efficiency, which is considered one of the seventeen indicators for inland port ranking. Secondly, Analytic Hierarchy Process (AHP) and the entropy method are used to calculate the subjective and objective weights of the indicators for determining their relative importance. Finally, the technique for order preference by similarity to ideal solution (TOPSIS) method is developed to calculate the inland port ranking. This paper did a case study by adopting five major inland ports along the Yangtze River, which are Wuhan, Jiujiang, Yueyang, Yichang, Huangshi, and Jingzhou ports. The evaluation results were analyzed in depth to identify each port's strengths and weaknesses. Based on these analyses, solutions and recommendations are proposed for ports with purely technical inefficiencies, input redundancy and output shortfall, as well as management insights for sustainable port development.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"83 ","pages":"Article 104062"},"PeriodicalIF":2.1,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143376571","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":"Multiscale climate forcing on green and hawksbill turtle nesting dynamics in Malaysia","authors":"Maigualida Ricoy Martínez ,&nbsp;Katrina Anne de Rozario ,&nbsp;Mislina Mustafa ,&nbsp;Maisarah Mohd Ali Ridza ,&nbsp;Sharnietha Ratnam ,&nbsp;Bernard Cazelles","doi":"10.1016/j.rsma.2025.104064","DOIUrl":"10.1016/j.rsma.2025.104064","url":null,"abstract":"<div><div>Sea turtles play critical roles in marine ecosystems, yet they face numerous threats, not only of anthropogenic origin but also those exacerbated by environmental changes. This study investigates the impacts of both local and global climatic forcing on green (<em>Chelonia mydas</em>) and hawksbill (<em>Eretmochelys imbricata</em>) turtle populations in Malaysia. Using 17 years of nesting data from Tioman Island, we examined nesting abundance, spatial distribution, temporal trends, and egg abundance in relation to local climatic conditions (temperature and precipitation) and global climatic conditions (El Niño Southern Oscillation – ENSO), through Wavelet Analysis. Our study demonstrates that both local and global climate variables significantly influence turtle egg abundance, with local factors driving short-term seasonal variability and global factors like ENSO affecting long-term multiannual cycles. Additionally, we found that warmer temperatures during El Niño events negatively impact green turtles egg abundance 2 years and a half later but positively impact hawksbill turtles 2 years post–event. These contrasting responses emphasize species-specific reproductive adaptations to climatic variability. Understanding these dynamics is critical for developing adaptive conservation strategies that mitigate the effects of climate change and promote sustainable population management for both species.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"83 ","pages":"Article 104064"},"PeriodicalIF":2.1,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143376570","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":"How the commercialization of live bait impacts the profitability of artisanal fishing in a Brazilian estuary: A proximity economy approach","authors":"Suellen Mariano da Silva ,&nbsp;Alberto Ferreira de Amorim ,&nbsp;Leonardo Castilho-Barros ,&nbsp;Newton José Rodrigues da Silva ,&nbsp;Marcelo Barbosa Henriques","doi":"10.1016/j.rsma.2025.104057","DOIUrl":"10.1016/j.rsma.2025.104057","url":null,"abstract":"<div><div>The economic viability of artisanal fishing practiced in the estuarine region of Santos, São Paulo, Brazil, was evaluated, considering the hypothesis that this activity could be more profitable for fishers, with the storage and maintenance of white shrimp <em>Litopenaeus schmitti</em> in tanks for sale as live bait for recreational fishing. Between August 2022 and July 2023, socioeconomic and fishing production data were obtained through interviews with 282 artisanal fishers. The initial investment costs, with and without the live bait maintenance system, were, respectively, US$ 4285.79 and US$ 3663.20, and the operational cost for a 12-month cycle were, respectively, US$ 25,798.80 ( ± 26.43 standard deviation) and US$ 25,583.02. Three scenarios were proposed, considering production 20 % higher (scenario A) and 20 % lower (scenario C) in relation to normal production conditions (scenario B). A sensitivity analysis was also carried out with four models related to the possibilities of selling shrimp for consumption and live bait. Annual gross income ranged from US$47,581.20 to US$52,635.60. All scenarios and modeling were viable as they showed investment recovery capacity and a return rate higher than the minimum attractiveness rate of 12 % year⁻¹. The alternative system for maintaining shrimp in recirculation improved profitability, ensured more security, and enabled more fishers and families to be incorporated into supplying live bait, strengthening the activity and promoting economic and social improvements in the region.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"83 ","pages":"Article 104057"},"PeriodicalIF":2.1,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135693","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":"Accumulation of octylphenol and nonylphenol in the fishes of Terengganu, Malaysia","authors":"Mohd Yusoff Nurulnadia ,&nbsp;Baharom Mohamad Zahid ,&nbsp;Ku Mohd Kalkausar Ku Yusof","doi":"10.1016/j.rsma.2025.104061","DOIUrl":"10.1016/j.rsma.2025.104061","url":null,"abstract":"<div><div>Octylphenol (OP) and nonylphenol (NP) are two endocrine disrupting chemicals, which able to disrupt the endocrine system in biota, including fish. Thus, this study aims to determine the concentration of OP and NP in the fish. Eleven genera of fish samples were collected in the year 2018 and 2019 from three rivers of Terengganu. Target compounds in the whole sample were extracted using solvent extraction method and cleaned up using solid-phase extraction cartridges. <em>Arius</em> sp. presence in both years with concentration of OP (6.02 – 18.5 ng/g ww) and NP (3.55 – 13.9 ng/g ww). The concentration level in other fish genera were less than 10 ng/g ww. Kruskal-Wallis test proved that the concentration level of target compounds in fishes was significantly higher (<em>P</em> &lt; 0.05) in benthopelagic and demersal fishes. Regardless of fish genera, OP concentration was significant difference spatially (<em>P</em> &lt; 0.05) but not temporally. Comparing between three sample matrices, both chemicals prefer to accumulate in fish and sediment compared to water. Principal component analysis indicated that fish, especially benthic feeders (benthopelagic and demersal fish) are likely accumulating OP and NP through the sediment.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"83 ","pages":"Article 104061"},"PeriodicalIF":2.1,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096821","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":"Assessment of metal accumulations and ecological risks in sediments around tuna farming in the eastern Aegean Sea","authors":"Aslı Başaran,&nbsp;Mehmet Aksu","doi":"10.1016/j.rsma.2025.104055","DOIUrl":"10.1016/j.rsma.2025.104055","url":null,"abstract":"<div><div>Tuna farming has been conducted since 2002 at the sampling site located in the Eastern Aegean Sea. The long-term continuation of this activity in the region has raised concerns regarding its impact on the marine environment, particularly sediment quality. The present study investigated the accumulation of metals, total organic carbon (TOC), phosphorus, and sulfur in sediments influenced by tuna farming and changes in sediment quality using various pollution indices. The highest sulfur concentration (0.19 %) was recorded at the cage stations, indicating significant organic enrichment. The analysis revealed that the average metal concentrations followed the decreasing order of Mn &gt; Cr &gt; Ni &gt; As &gt; Co &gt; Mo &gt; Hg &gt; Cd. It was observed that the concentrations of molybdate, manganese, cadmium, and mercury in the area surrounding the cages were approximately 10 % higher than those in the reference stations. The evaluation of metal analyses in the sediments indicated that farming activities increased Cd, Mn, Hg, and Mo levels at the cage stations. However, none of these metals (except As) exceeded the shale value reference levels. Although cadmium exhibited the highest concentration at the cage station according to the EF and Cf indices, the sediment was classified as having low contamination based on the Cf index. Given the relatively high background concentrations of cadmium and arsenic in the sediment and enrichment from farming-related wastes (such as bait fish and chemicals used in ship maintenance), the fish farming area can be characterized as moderately ecologically risky. While the metal levels in the sediment at the tuna farming site in the Gerence region have yet to reach critical thresholds, continuous monitoring of metals such as arsenic and cadmium in the sediment is essential to ensure the sustainability of farming activities.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"83 ","pages":"Article 104055"},"PeriodicalIF":2.1,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135947","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 reproductive biology of the marbled crab, Pachygrapsus marmoratus (Fabricius, 1787) in the south-eastern Mediterranean Sea, Alexandria, Egypt","authors":"Ola Mohamed Nour ,&nbsp;Zeinab Khodary ,&nbsp;Salwa A. El-Saidy","doi":"10.1016/j.rsma.2025.104018","DOIUrl":"10.1016/j.rsma.2025.104018","url":null,"abstract":"<div><div><em>Pachygrapsus marmoratus</em> is one of the most prevalent intertidal crab species in the south-eastern Mediterranean Sea. It is an indicator of a stable and biodiverse ecosystem due to its contribution to ecological balance through its diverse feeding behaviours, bioturbation, and regulation of prey populations. However, its population characteristics have not been studied to date in the Egyptian Mediterranean waters. The present work aimed to assess some biological characteristics of the <em>P. marmoratus</em> population from Camp Caesar shore, Alexandria, Egypt. Crabs were collected monthly from July 2023 till June 2024. The sex ratio was not significantly different from 1:1. <em>Pachygrapsus marmoratus</em> exhibited an 8-month reproductive season from February to September, with the highest spawning peak in April. The average carapace width of females was significantly larger compared to males. The size-frequency distribution showed a unimodal pattern for both sexes, with the maximum peak in the 20.1–25.0 mm size class. Significant differences have been revealed between the two sexes with respect to the carapace width-body wet weight, carapace width-carapace length, and carapace width-claw length relationships. The number, weight, and average size of eggs were positively correlated with the ovigerous females' carapace width and wet weight. The obtained results shed some light on the population structure of <em>P. marmoratus</em>, revealing its stability in the Egyptian Mediterranean Sea and offering baseline information for making comparisons with other studies, thereby enhancing the understanding of how variations in the biological and ecological characteristics of this species influence its extensive distribution along the Mediterranean and Atlantic regions.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"82 ","pages":"Article 104018"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177890","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":"Comparative analysis of macro, meso and micro waste at two tropical beaches, Southwest, Brazil","authors":"Julia Terra Souza Torres ,&nbsp;Leticia Parada Moreira ,&nbsp;Landulfo Silveira Junior ,&nbsp;Helen Sadauskas-Henrique","doi":"10.1016/j.rsma.2025.104026","DOIUrl":"10.1016/j.rsma.2025.104026","url":null,"abstract":"<div><div>The present study aimed to analyze the presence of macro, meso and micro waste at Baleia and As Ilhas beach, Southwest, Brazil. The protocol proposed in 2013 by the National Oceanic and Atmospheric Administration (NOAA), was used to carry out the assessment of marine litter. Besides identifying the chemical composition of the polymer of the plastic items found, through Raman spectroscopy. The predominance of plastic at the studied beaches was evidenced in this study, corroborating with the findings in the scientific literature, for macro waste plastics represented 51 % at As Ilhas and 48 % at Baleia beach and 65 % at As Ilhas and 89 % at Baleia beach for micro waste. The most common compounds found were Polypropylene (PP) and Polystyrene (PS). It can be inferred that the users of the beaches in question are directly linked to the presence of trash in these environments, especially due to its inadequate disposal.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"82 ","pages":"Article 104026"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143178522","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":"Perceptions and adaptive strategies of artisanal fishers to a changing environment","authors":"Jahson B. Alemu I","doi":"10.1016/j.rsma.2025.104045","DOIUrl":"10.1016/j.rsma.2025.104045","url":null,"abstract":"<div><div>Artisanal fishers represent a critical yet under-researched component of small-island coastal economies, where environmental changes threaten both livelihoods and marine ecosystems. Despite increasing global attention to the interaction between coral reefs and fisheries, limited studies have explored the adaptive capacity of fishers to environmental change, especially when losses in fisheries may be inevitable. This study examines the environmental perceptions, adaptive capacities, and behavioral responses of artisanal fishers to changes in marine resources, using the island of Tobago as a case study. Using face-to-face surveys, quantitative and qualitative data were collected from five fishing modalities (a-la-vive, trolling, multigear [line], trap, and spear) across seven representative fishing villages. The findings revealed that while fishing remains central to fishers’ livelihoods and cultural identity, many respondents maintain alternative livelihoods. Over the past decade, fishers reported significant declines in catch size and abundance, attributing these changes to overexploitation and environmental shifts. However, their awareness of the link between coral reef health and fishery productivity varied, with limited recognition of this link, particularly among those operating outside reef-dependent practices. In terms of adaptive capacity, multigear (line) fishers exhibited the greatest flexibility by employing diverse gear types and targeting species based on availability. In contrast, fishers using single-gear methods, such as traps and spears, demonstrated lower adaptability and higher vulnerability to changes in marine resources. Changes in fishing behaviors in response to shifts in fish stocks ranged from increasing fishing intensity to relocating to new fishing areas, highlighting potential risks of overexploitation in less-utilized areas. These findings highlight the socio-economic and ecological complexity of managing artisanal fisheries in Tobago, and emphasize the need for tailored, gear-specific management strategies that support ecological sustainability while bolstering the cultural and economic resilience of fishing communities.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"82 ","pages":"Article 104045"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143179544","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}