The amino acid profile of Plesionika edwardsii in relation to its astaxanthin content, was examined in shrimp captured from traps at varying depths (210, 350, 450, and 500 m), with an attempt to establish a correlation between the two factors. The effect of the presence of the egg has also been evaluated. Total essential amino acid (EAA) content increased with depth, regardless of egg presence, while total non-EAA content was positively influenced by both depth and egg presence. Lysine, arginine, and leucine were identified as the predominant EAAs, while glutamic acid and aspartic acid were the major non-EAAs at all depths. Notably, shrimp caught at 210 m with eggs exhibited lower amino acid content compared to those from deeper depths, particularly 450 and 500 m. The lightness and redness of shrimps decrease with increasing depth, while b* value remained consistent across all conditions. A clear trend of decreasing astaxanthin values was observed, with some statistically significant differences suggesting a possible effect of depth. There is more concentrated astaxanthin in shrimp caught at shallower depths and decreases as the depth increases. A significant negative correlation was observed between astaxanthin content and most amino acids, particularly methionine, valine, and alanine, with this trend more pronounced in shrimp with eggs. These findings indicate that astaxanthin and amino acids could experience functional variations depending on environmental conditions.
{"title":"Depth-dependent biochemical changes in Plesionika edwardsii: Inverse correlation between amino acids and astaxanthin","authors":"Hanife Aydan Yatmaz , Turhan Kebapcioglu , Pinar Yerlikaya","doi":"10.1016/j.rsma.2026.104818","DOIUrl":"10.1016/j.rsma.2026.104818","url":null,"abstract":"<div><div>The amino acid profile of <em>Plesionika edwardsii</em> in relation to its astaxanthin content, was examined in shrimp captured from traps at varying depths (210, 350, 450, and 500 m), with an attempt to establish a correlation between the two factors. The effect of the presence of the egg has also been evaluated. Total essential amino acid (EAA) content increased with depth, regardless of egg presence, while total non-EAA content was positively influenced by both depth and egg presence. Lysine, arginine, and leucine were identified as the predominant EAAs, while glutamic acid and aspartic acid were the major non-EAAs at all depths. Notably, shrimp caught at 210 m with eggs exhibited lower amino acid content compared to those from deeper depths, particularly 450 and 500 m. The lightness and redness of shrimps decrease with increasing depth, while b* value remained consistent across all conditions. A clear trend of decreasing astaxanthin values was observed, with some statistically significant differences suggesting a possible effect of depth. There is more concentrated astaxanthin in shrimp caught at shallower depths and decreases as the depth increases. A significant negative correlation was observed between astaxanthin content and most amino acids, particularly methionine, valine, and alanine, with this trend more pronounced in shrimp with eggs. These findings indicate that astaxanthin and amino acids could experience functional variations depending on environmental conditions.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104818"},"PeriodicalIF":2.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146090452","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}
Pub Date : 2026-03-01Epub Date: 2026-02-02DOI: 10.1016/j.rsma.2026.104828
Breno Q.A. Rodrigues , João Barreira , Sarah K. Rodrigues , Jérémie Garnier , Myller S. Tonhá , Christian J. Sanders , Wilson Machado
Since the 1960s, Guanabara Bay and its drainage basin have been experiencing significant environmental degradation and contamination, primarily due to population growth. This study focuses on temporal and spatial metal distribution (Al, Fe, Mn, Ba, P, Cr, Co, Pb, Cu and Zn), along with the analysis of grain size, total organic carbon (TOC), total nitrogen (TN), carbon and nitrogen stable isotopes (δ13C and δ15N, respectively) in a mangrove sedimentary core collected in the Estrela River (RE) estuary (Guanabara Bay, RJ). Three distinct sedimentary phases were suggested. The first phase represents a natural undisturbed environment, the second phase marks the onset of human intervention and the third phase relates to a stagnation in the anthropogenic influence. A Principal Component Analysis (PCA) also indicated both natural and anthropogenic sources. A positive correlation between Ba and P (indicating sewage sources) and Cr, Co, Zn, Cu and Pb (associated with urban and industrial wastewater) suggests similar historical sources while a strong correlation between Cu, Zn and P in superficial sediments suggested similar sources spatially. Notably, Cu and Zn exhibited high Enrichment Factors (EF) and Geo-accumulation index (Igeo) values, indicating significant contamination levels, particularly for Cu. Sediment Quality Guidelines Quotient (SQGQ) values also raised concerns about sediment quality in the RE basin, highlighting a potential toxicity risk to local biota. This study provides knowledge about the historical and spatial patterns of metal accumulation and distribution, offering important information on contamination sources and the environmental consequences of anthropogenic activities in the region.
{"title":"Temporal and spatial metal contamination trends in the Estrela River Basin, Guanabara Bay, Brazil","authors":"Breno Q.A. Rodrigues , João Barreira , Sarah K. Rodrigues , Jérémie Garnier , Myller S. Tonhá , Christian J. Sanders , Wilson Machado","doi":"10.1016/j.rsma.2026.104828","DOIUrl":"10.1016/j.rsma.2026.104828","url":null,"abstract":"<div><div>Since the 1960s, Guanabara Bay and its drainage basin have been experiencing significant environmental degradation and contamination, primarily due to population growth. This study focuses on temporal and spatial metal distribution (Al, Fe, Mn, Ba, P, Cr, Co, Pb, Cu and Zn), along with the analysis of grain size, total organic carbon (TOC), total nitrogen (TN), carbon and nitrogen stable isotopes (δ<sup>13</sup>C and δ<sup>15</sup>N, respectively) in a mangrove sedimentary core collected in the Estrela River (RE) estuary (Guanabara Bay, RJ). Three distinct sedimentary phases were suggested. The first phase represents a natural undisturbed environment, the second phase marks the onset of human intervention and the third phase relates to a stagnation in the anthropogenic influence. A Principal Component Analysis (PCA) also indicated both natural and anthropogenic sources. A positive correlation between Ba and P (indicating sewage sources) and Cr, Co, Zn, Cu and Pb (associated with urban and industrial wastewater) suggests similar historical sources while a strong correlation between Cu, Zn and P in superficial sediments suggested similar sources spatially. Notably, Cu and Zn exhibited high Enrichment Factors (EF) and Geo-accumulation index (Igeo) values, indicating significant contamination levels, particularly for Cu. Sediment Quality Guidelines Quotient (SQGQ) values also raised concerns about sediment quality in the RE basin, highlighting a potential toxicity risk to local biota. This study provides knowledge about the historical and spatial patterns of metal accumulation and distribution, offering important information on contamination sources and the environmental consequences of anthropogenic activities in the region.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104828"},"PeriodicalIF":2.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191219","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}
Pub Date : 2026-03-01Epub Date: 2026-02-17DOI: 10.1016/j.rsma.2026.104860
Rafael Carvalho Santos , Isabela R.R. Moraes , Régis Augusto Pescinelli , Douglas Fernandes Rodrigues Alves , Antonio Leão Castilho , Rogério Caetano Costa
Athanas nitescens, naturally distributed in the Indo-West Pacific and Eastern Atlantic, has been recorded as an alien species on the Brazilian coast over the last decade. This study reports, for the first time, its presence in the Alcatrazes Archipelago, a marine protected area (MPA), and assesses the risk of its colonization in other MPAs using the niche modeling approach. Three specimens of A. nitescens were registered in the Alcatrazes Archipelago: 1 male, 1 ovigerous female, and 1 parental female. The results suggested areas with environmental suitability (ES) for A. nitescens in the MPAs from the Brazilian coast, with salinity range and mean temperature as the most important factors for ES. Values of water temperature above 28 °C indicated a limitation of occurrence of A. nitescens; thus, warmer areas such as the MPAs from northeastern Brazil demonstrated the smallest ES mean values compared to the Alcatrazes Archipelago area. Conversely, the greatest suitability was found in southern Brazil, a region strongly influenced by the confluence of the Brazil and Malvinas currents, potentially reflecting a convergence of the key environmental variables modeled, similar to the species’ native range distribution. The importance of monitoring the presence of non-native species in marine protected areas is indispensable for preserving and evaluating the real risk that the potential occurrence of A. nitescens may represent for the native community.
{"title":"The occurrence of shrimp Athanas nitescens (Leach, 1814) in the Alcatrazes Archipelago conservation unit: How susceptible are other marine protected areas along the Brazilian coast to this invader?","authors":"Rafael Carvalho Santos , Isabela R.R. Moraes , Régis Augusto Pescinelli , Douglas Fernandes Rodrigues Alves , Antonio Leão Castilho , Rogério Caetano Costa","doi":"10.1016/j.rsma.2026.104860","DOIUrl":"10.1016/j.rsma.2026.104860","url":null,"abstract":"<div><div><em>Athanas nitescens</em>, naturally distributed in the Indo-West Pacific and Eastern Atlantic, has been recorded as an alien species on the Brazilian coast over the last decade. This study reports, for the first time, its presence in the Alcatrazes Archipelago, a marine protected area (MPA), and assesses the risk of its colonization in other MPAs using the niche modeling approach. Three specimens of <em>A. nitescens</em> were registered in the Alcatrazes Archipelago: 1 male, 1 ovigerous female, and 1 parental female. The results suggested areas with environmental suitability (ES) for <em>A. nitescens</em> in the MPAs from the Brazilian coast, with salinity range and mean temperature as the most important factors for ES. Values of water temperature above 28 °C indicated a limitation of occurrence of <em>A. nitescens</em>; thus, warmer areas such as the MPAs from northeastern Brazil demonstrated the smallest ES mean values compared to the Alcatrazes Archipelago area. Conversely, the greatest suitability was found in southern Brazil, a region strongly influenced by the confluence of the Brazil and Malvinas currents, potentially reflecting a convergence of the key environmental variables modeled, similar to the species’ native range distribution. The importance of monitoring the presence of non-native species in marine protected areas is indispensable for preserving and evaluating the real risk that the potential occurrence of <em>A. nitescens</em> may represent for the native community.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104860"},"PeriodicalIF":2.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147422287","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}
Pub Date : 2026-03-01Epub Date: 2026-01-26DOI: 10.1016/j.rsma.2026.104806
Edgar Abraham Aragón-Flores , Rocío Rodiles-Hernández , Miriam Soria-Barreto , Matteo Cazzanelli , Carmen G. Montaña , María M. Castillo
Estuarine food webs are shaped by connectivity with adjacent ecosystems and seasonal hydrological changes that influence resource availability and trophic structure. In this study, we used stable isotopes (δ13C and δ15N) to evaluate the food web structure of fish assemblages in two tropical estuarine lagoon systems in the southern Gulf of Mexico that differ in freshwater and marine connectivity. Stable isotope diversity metrics were applied to assess spatial and seasonal variation in isotopic niche structure and to estimate trophic similarity between resident and marine transient fish groups. Our results indicated marked spatial differences in food web structure between systems. In the Pom-Atasta system, fish assemblages exhibited longer food web chains, greater diversity of assimilated resources, and higher trophic diversity and specialization. In contrast, fish assemblages in the Palizada del Este system reflected stronger hydrological connectivity, characterized by lower carbon isotope values, higher nitrogen isotope values, and more uniform resource use. Seasonal patterns were consistent across both systems: during the rainy season, consumers displayed greater trophic specialization, whereas during the “nortes” season, carbon isotope values were lower and trophic similarity between resident and marine transient fishes increased. Overall, spatial variation in food web structure highlights the complexity of ecosystem functioning in estuarine lagoon systems and reflects differences in geomorphological configuration, autochthonous productivity, and freshwater–marine connectivity. Seasonal changes underscore the importance of resource inputs associated with the flood pulse from the Usumacinta Basin in these estuarine ecosystems.
河口食物网是由与邻近生态系统的连通性和影响资源可用性和营养结构的季节性水文变化形成的。在这项研究中，我们使用稳定同位素（δ13C和δ15N）来评估墨西哥湾南部两个淡水和海洋连通性不同的热带河口泻湖系统中鱼类组合的食物网结构。稳定同位素多样性指标被应用于评估同位素生态位结构的空间和季节变化，并估计居民和海洋洄游鱼类群体之间的营养相似性。我们的研究结果表明，不同系统之间的食物网结构存在显著的空间差异。在Pom-Atasta系统中，鱼类群落表现出更长的食物链、更大的同化资源多样性、更高的营养多样性和专业化。相比之下，Palizada del Este系统的鱼类组合具有较强的水文连通性，其特征是碳同位素值较低，氮同位素值较高，资源利用更均匀。季节模式在两个系统中是一致的：在雨季，消费者表现出更大的营养专业化，而在“北风”季节，碳同位素值较低，居民和海洋洄游鱼类之间的营养相似性增加。总体而言，食物网结构的空间变化突出了河口泻湖系统生态系统功能的复杂性，反映了地貌配置、本地生产力和淡水-海洋连通性的差异。季节变化强调了与乌苏马辛塔盆地洪水脉冲相关的资源投入在这些河口生态系统中的重要性。
{"title":"Estuarine structure and connectivity influence seasonal and spatial shifts in the food web structure of fish assemblages","authors":"Edgar Abraham Aragón-Flores , Rocío Rodiles-Hernández , Miriam Soria-Barreto , Matteo Cazzanelli , Carmen G. Montaña , María M. Castillo","doi":"10.1016/j.rsma.2026.104806","DOIUrl":"10.1016/j.rsma.2026.104806","url":null,"abstract":"<div><div>Estuarine food webs are shaped by connectivity with adjacent ecosystems and seasonal hydrological changes that influence resource availability and trophic structure. In this study, we used stable isotopes (δ<sup>13</sup>C and δ<sup>15</sup>N) to evaluate the food web structure of fish assemblages in two tropical estuarine lagoon systems in the southern Gulf of Mexico that differ in freshwater and marine connectivity. Stable isotope diversity metrics were applied to assess spatial and seasonal variation in isotopic niche structure and to estimate trophic similarity between resident and marine transient fish groups. Our results indicated marked spatial differences in food web structure between systems. In the Pom-Atasta system, fish assemblages exhibited longer food web chains, greater diversity of assimilated resources, and higher trophic diversity and specialization. In contrast, fish assemblages in the Palizada del Este system reflected stronger hydrological connectivity, characterized by lower carbon isotope values, higher nitrogen isotope values, and more uniform resource use. Seasonal patterns were consistent across both systems: during the rainy season, consumers displayed greater trophic specialization, whereas during the “nortes” season, carbon isotope values were lower and trophic similarity between resident and marine transient fishes increased. Overall, spatial variation in food web structure highlights the complexity of ecosystem functioning in estuarine lagoon systems and reflects differences in geomorphological configuration, autochthonous productivity, and freshwater–marine connectivity. Seasonal changes underscore the importance of resource inputs associated with the flood pulse from the Usumacinta Basin in these estuarine ecosystems.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104806"},"PeriodicalIF":2.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146090358","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}
Pub Date : 2026-03-01Epub Date: 2026-01-26DOI: 10.1016/j.rsma.2026.104804
Muhandis Sidqi , Dietriech G. Bengen , Maret Priyanta , Eva Anggraini , Lilis Sadiyah , Tirtadanu
Marine ecotourism holds significant potential as a driver for sustainable economic development and environmental conservation, particularly in destinations like the Gili Matra Marine Conservation Area (GMMCA). This research aims to perform an economic valuation of marine ecotourism within the Gili Matra Marine Conservation Area. The study employed the Travel Cost Method (TCM) approach, integrating a tourist survey, Focus Group Discussions (FGD) with stakeholders, and secondary data analysis. The analysis results indicate that tourism demand is influenced by travel distance to the destination (for both domestic and international tourists), and by education level (for international tourists). Consumer surplus was recorded at 712,221.07 Indonesian Rupiahs (IDR) per individual for domestic tourists and USD25.41 per individual for international tourists, with total economic values reaching 467.53 billion IDR and USD16.68 million, respectively. Domestic tourists spend more money within the conservation area compared to outside, while international tourists' expenditures are higher outside the area than inside. The largest direct economic impact is generated by food and beverage kiosks, the indirect impact stems from raw material purchases, and the highest induced impact is generated by diving services. The multiplier effect analysis shows that the Keynesian Income Multiplier is still low, but the Type I and Type II Ratio Income Multipliers are greater than 1, indicating a strong local economic circulation. Marine ecotourism in Gili Matra has provided substantial benefits to the local economy, created business opportunities, and absorbed labor. However, further strategies are necessary to enhance the economic leverage and ensure a more equitable distribution of the economic impact for the surrounding communities.
{"title":"Sustainable management of marine ecotourism in the Gili Matra Marine Conservation Area: An economic valuation and stakeholder-based approach","authors":"Muhandis Sidqi , Dietriech G. Bengen , Maret Priyanta , Eva Anggraini , Lilis Sadiyah , Tirtadanu","doi":"10.1016/j.rsma.2026.104804","DOIUrl":"10.1016/j.rsma.2026.104804","url":null,"abstract":"<div><div>Marine ecotourism holds significant potential as a driver for sustainable economic development and environmental conservation, particularly in destinations like the Gili Matra Marine Conservation Area (GMMCA). This research aims to perform an economic valuation of marine ecotourism within the Gili Matra Marine Conservation Area. The study employed the Travel Cost Method (TCM) approach, integrating a tourist survey, Focus Group Discussions (FGD) with stakeholders, and secondary data analysis. The analysis results indicate that tourism demand is influenced by travel distance to the destination (for both domestic and international tourists), and by education level (for international tourists). Consumer surplus was recorded at 712,221.07 Indonesian Rupiahs (IDR) per individual for domestic tourists and USD25.41 per individual for international tourists, with total economic values reaching 467.53 billion IDR and USD16.68 million, respectively. Domestic tourists spend more money within the conservation area compared to outside, while international tourists' expenditures are higher outside the area than inside. The largest direct economic impact is generated by food and beverage kiosks, the indirect impact stems from raw material purchases, and the highest induced impact is generated by diving services. The multiplier effect analysis shows that the Keynesian Income Multiplier is still low, but the Type I and Type II Ratio Income Multipliers are greater than 1, indicating a strong local economic circulation. Marine ecotourism in Gili Matra has provided substantial benefits to the local economy, created business opportunities, and absorbed labor. However, further strategies are necessary to enhance the economic leverage and ensure a more equitable distribution of the economic impact for the surrounding communities.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104804"},"PeriodicalIF":2.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146090455","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}
Visakhapatnam's Rushikonda Beach is a dynamic sandy beach that is impacted by longshore currents, tidal oscillations, and wave energy generated by the monsoon. For coastal management and safety, ongoing observation of shoreline behavior and nearshore morphology is crucial at this Blue Flag-certified recreational beach on India's east coast. This study shows how to measure intertidal beach slope and shoreline variations over the course of an entire year (January–December 2023) using an affordable Video Beach Monitoring System (VBMS). DGPS-based ground control points were used to geometrically rectify video frames after lens distortion correction and time-averaged (timex) picture conversion. A Red-minus-Blue (RmB) edge-detection technique was used to extract shorelines, allowing for quick and precise processing. Sentinel-2-derived shorelines (RMSE = 6.05 m) were considerably less accurate than video-derived shorelines, which demonstrated strong agreement with DGPS surveys (RMSE = 0.8 m). Seasonal morphological patterns were shown by estimating intertidal slopes from high- and low-tide shorelines. Slopes varied from 3° to 5.8°, flattening before and after the monsoon (January–May, October–December), and steepening during the southwest monsoon (June–September) when high-energy waves (Hs = 2.0–2.5 m) caused noticeable coastline retreat. In monsoon-dominated sandy beaches, the combination of VBMS and CoastSnap tools gives a reliable, affordable framework for ongoing coastal monitoring and offers insightful information for assessing erosion and preparing for coastal hazards.
{"title":"Shoreline dynamics and beach topography analysis using video beach monitoring and CoastSnap tools at a blue flag beach on India’s east coast","authors":"Baggu Gireesh , Madipally Ramesh , Surisetty V.V. Arun Kumar , Chintam Venkateswarlu , Chennu V. Naidu , Leela Sheela Nair , Rashmi Sharma","doi":"10.1016/j.rsma.2026.104855","DOIUrl":"10.1016/j.rsma.2026.104855","url":null,"abstract":"<div><div>Visakhapatnam's Rushikonda Beach is a dynamic sandy beach that is impacted by longshore currents, tidal oscillations, and wave energy generated by the monsoon. For coastal management and safety, ongoing observation of shoreline behavior and nearshore morphology is crucial at this Blue Flag-certified recreational beach on India's east coast. This study shows how to measure intertidal beach slope and shoreline variations over the course of an entire year (January–December 2023) using an affordable Video Beach Monitoring System (VBMS). DGPS-based ground control points were used to geometrically rectify video frames after lens distortion correction and time-averaged (timex) picture conversion. A Red-minus-Blue (RmB) edge-detection technique was used to extract shorelines, allowing for quick and precise processing. Sentinel-2-derived shorelines (RMSE = 6.05 m) were considerably less accurate than video-derived shorelines, which demonstrated strong agreement with DGPS surveys (RMSE = 0.8 m). Seasonal morphological patterns were shown by estimating intertidal slopes from high- and low-tide shorelines. Slopes varied from 3° to 5.8°, flattening before and after the monsoon (January–May, October–December), and steepening during the southwest monsoon (June–September) when high-energy waves (Hs = 2.0–2.5 m) caused noticeable coastline retreat. In monsoon-dominated sandy beaches, the combination of VBMS and CoastSnap tools gives a reliable, affordable framework for ongoing coastal monitoring and offers insightful information for assessing erosion and preparing for coastal hazards.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104855"},"PeriodicalIF":2.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147422286","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}
Pub Date : 2026-03-01Epub Date: 2026-01-30DOI: 10.1016/j.rsma.2026.104805
Tong Xue , Yong Li , Qiang Mei , Yundi Bai , Yang Yang , Lei Cui , Peng Wang , Beibei Zhang , Shaohua Wang
<div><div>Ship emissions exacerbate air pollution in ports, and their assessment and control have attracted widespread attention from both government and academia. To enable scientific tracing and management of port-related ship pollutants, this study proposes an multi-view intelligent spatiotemporal computing framework that integrates emission inventory construction and emission forecasting. The emission inventory is constructed based on AIS data, combined with vessel activity parameters and emission factor models, covering channels, anchorages, and berths to achieve high spatiotemporal resolution. In the prediction module, Transformer-, MLP-, TCN-, and RNN-based models are employed, and CEEMDAN is introduced for multi-scale decomposition to address the non-stationary nature of emission sequences. Experimental results for Tianjin Port from 2015 to 2018 show that CO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>, <span><math><msub><mrow><mtext>SO</mtext></mrow><mrow><mtext>X</mtext></mrow></msub></math></span>, and <span><math><msub><mrow><mtext>NO</mtext></mrow><mrow><mtext>X</mtext></mrow></msub></math></span> emissions increased from <span><math><mrow><mn>8</mn><mo>.</mo><mn>66</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>5</mn></mrow></msup></mrow></math></span> t, <span><math><mrow><mn>1</mn><mo>.</mo><mn>28</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>4</mn></mrow></msup></mrow></math></span> t, and <span><math><mrow><mn>6</mn><mo>.</mo><mn>6</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>3</mn></mrow></msup></mrow></math></span> t in 2015 to <span><math><mrow><mn>1</mn><mo>.</mo><mn>35</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>6</mn></mrow></msup></mrow></math></span> t, <span><math><mrow><mn>1</mn><mo>.</mo><mn>74</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>4</mn></mrow></msup></mrow></math></span> t, and <span><math><mrow><mn>9</mn><mo>.</mo><mn>6</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>3</mn></mrow></msup></mrow></math></span> t in 2018, respectively. Spatially, the Xingang main channel and Beijiang Port area are emission hotspots. Among vessel types, oil tankers, bulk carriers, and container ships collectively contribute over 90% of total emissions. Source analysis indicates that main engine emissions in channels exceeded 70%, while berths and anchorages together contributed over 90%. Comparative prediction results demonstrate that CEEMDAN decomposition enhances the fine-grained representation of emission forecasts across all model types. The hybrid model <span><math><mtext>SCINet_D</mtext></math></span>, which integrates the strengths of SCINet and DLinear, exhibits relatively favorable predictive performance. The proposed spatiotemporal computing framework enables a coordinated analysis of emission inventory construction and trend prediction, providing scientific support for refined port air quality management, emission reduction strategies, and
{"title":"Port pollution prediction and management via multi-view intelligent computing: A case study of Tianjin Port","authors":"Tong Xue , Yong Li , Qiang Mei , Yundi Bai , Yang Yang , Lei Cui , Peng Wang , Beibei Zhang , Shaohua Wang","doi":"10.1016/j.rsma.2026.104805","DOIUrl":"10.1016/j.rsma.2026.104805","url":null,"abstract":"<div><div>Ship emissions exacerbate air pollution in ports, and their assessment and control have attracted widespread attention from both government and academia. To enable scientific tracing and management of port-related ship pollutants, this study proposes an multi-view intelligent spatiotemporal computing framework that integrates emission inventory construction and emission forecasting. The emission inventory is constructed based on AIS data, combined with vessel activity parameters and emission factor models, covering channels, anchorages, and berths to achieve high spatiotemporal resolution. In the prediction module, Transformer-, MLP-, TCN-, and RNN-based models are employed, and CEEMDAN is introduced for multi-scale decomposition to address the non-stationary nature of emission sequences. Experimental results for Tianjin Port from 2015 to 2018 show that CO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>, <span><math><msub><mrow><mtext>SO</mtext></mrow><mrow><mtext>X</mtext></mrow></msub></math></span>, and <span><math><msub><mrow><mtext>NO</mtext></mrow><mrow><mtext>X</mtext></mrow></msub></math></span> emissions increased from <span><math><mrow><mn>8</mn><mo>.</mo><mn>66</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>5</mn></mrow></msup></mrow></math></span> t, <span><math><mrow><mn>1</mn><mo>.</mo><mn>28</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>4</mn></mrow></msup></mrow></math></span> t, and <span><math><mrow><mn>6</mn><mo>.</mo><mn>6</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>3</mn></mrow></msup></mrow></math></span> t in 2015 to <span><math><mrow><mn>1</mn><mo>.</mo><mn>35</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>6</mn></mrow></msup></mrow></math></span> t, <span><math><mrow><mn>1</mn><mo>.</mo><mn>74</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>4</mn></mrow></msup></mrow></math></span> t, and <span><math><mrow><mn>9</mn><mo>.</mo><mn>6</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>3</mn></mrow></msup></mrow></math></span> t in 2018, respectively. Spatially, the Xingang main channel and Beijiang Port area are emission hotspots. Among vessel types, oil tankers, bulk carriers, and container ships collectively contribute over 90% of total emissions. Source analysis indicates that main engine emissions in channels exceeded 70%, while berths and anchorages together contributed over 90%. Comparative prediction results demonstrate that CEEMDAN decomposition enhances the fine-grained representation of emission forecasts across all model types. The hybrid model <span><math><mtext>SCINet_D</mtext></math></span>, which integrates the strengths of SCINet and DLinear, exhibits relatively favorable predictive performance. The proposed spatiotemporal computing framework enables a coordinated analysis of emission inventory construction and trend prediction, providing scientific support for refined port air quality management, emission reduction strategies, and ","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104805"},"PeriodicalIF":2.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191157","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}
Pub Date : 2026-03-01Epub Date: 2026-01-27DOI: 10.1016/j.rsma.2026.104800
Pavani Darapureddy, Rajashree Naik
Mangroves in the Bay of Bengal face increasing seasonal stress from climate change and altered freshwater inflows, threatening biodiversity, carbon storage, and shoreline stability. The Krishna Wildlife Sanctuary (KWS), a key estuarine mangrove system on India’s east coast, is especially vulnerable to these seasonal hydrological shifts. We analyzed Landsat 8 time-series (2014–2025) to quantify Normalized Difference vegetation Index (NDVI) and Normalized Difference Water Index (NDWI) across summer (April–June) and winter (December–February). NDVI and NDWI were higher in winter than in summer, reflecting reduced evapotranspiration, monsoonal recharge, and improved freshwater availability. These results emphasize the importance of seasonal hydrology in sustaining mangrove ecosystems. The study contributes to global conservation targets by supporting SDG 6 (Clean Water and Sanitation) through freshwater regulation and natural filtration, and maintaining the hydrological balance in coastal regions, SDG 14 (Life Below Water) by monitoring estuarine mangrove ecosystem health and SDG 15 (Life on Land) by highlighting mangroves as critical habitats. NDVI and NDWI proved to be effective indicators of ecological changes, and their application can guide adaptive conservation strategies, freshwater management, and policy planning under climate stress.
{"title":"Mangroves and the SDGs: Remote sensing – Based evaluation of vegetation and water dynamics","authors":"Pavani Darapureddy, Rajashree Naik","doi":"10.1016/j.rsma.2026.104800","DOIUrl":"10.1016/j.rsma.2026.104800","url":null,"abstract":"<div><div>Mangroves in the Bay of Bengal face increasing seasonal stress from climate change and altered freshwater inflows, threatening biodiversity, carbon storage, and shoreline stability. The Krishna Wildlife Sanctuary (KWS), a key estuarine mangrove system on India’s east coast, is especially vulnerable to these seasonal hydrological shifts. We analyzed Landsat 8 time-series (2014–2025) to quantify Normalized Difference vegetation Index (NDVI) and Normalized Difference Water Index (NDWI) across summer (April–June) and winter (December–February). NDVI and NDWI were higher in winter than in summer, reflecting reduced evapotranspiration, monsoonal recharge, and improved freshwater availability. These results emphasize the importance of seasonal hydrology in sustaining mangrove ecosystems. The study contributes to global conservation targets by supporting SDG 6 (Clean Water and Sanitation) through freshwater regulation and natural filtration, and maintaining the hydrological balance in coastal regions, SDG 14 (Life Below Water) by monitoring estuarine mangrove ecosystem health and SDG 15 (Life on Land) by highlighting mangroves as critical habitats. NDVI and NDWI proved to be effective indicators of ecological changes, and their application can guide adaptive conservation strategies, freshwater management, and policy planning under climate stress.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104800"},"PeriodicalIF":2.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191155","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}
This study explores the propagation characteristics of coastal-trapped waves (CTWs) along the southern Caspian Sea (CS) using in situ observations and a high-resolution Finite-Volume Community Ocean Model (FVCOM). The observations show 2 and 6 days CTWs that begin south of the Absheron Peninsula and travel anticlockwise along the coast. Their phase speed ranges from approximately 0.2–0.6 m/s, with a mean value of about 0.4 m/s derived from multi-event arrival-time analysis. Some events travel more than 400 km, while many weaken on the wide and shallow southeastern shelf. In several cases, the wave amplitude decreases by more than 40 %. Northerly (N), northeasterly (NE), and north-northeasterly (NNE) storms stronger than 10 m/s and longer than 12 h are identified as the primary forcing mechanism, particularly in the western CS. Numerical simulations reproduce the observed CTW patterns and show a mostly barotropic structure in winter. Under thermal stratification, the waves exhibit lower energy and slightly faster phase speeds in the simulated events. These combined results provide a clearer view of how CTWs form, travel, and decay along the southern CS shelf.
{"title":"Propagation characteristics of coastal-trapped waves on the continental shelf of the Caspian Sea","authors":"Ehsan Shad , Ulrich Reza Kamalian , Seyed Mostafa Siadatmousavi , Amirpouya Bakhtiari","doi":"10.1016/j.rsma.2026.104787","DOIUrl":"10.1016/j.rsma.2026.104787","url":null,"abstract":"<div><div>This study explores the propagation characteristics of coastal-trapped waves (CTWs) along the southern Caspian Sea (CS) using in situ observations and a high-resolution Finite-Volume Community Ocean Model (FVCOM). The observations show 2 and 6 days CTWs that begin south of the Absheron Peninsula and travel anticlockwise along the coast. Their phase speed ranges from approximately 0.2–0.6 m/s, with a mean value of about 0.4 m/s derived from multi-event arrival-time analysis. Some events travel more than 400 km, while many weaken on the wide and shallow southeastern shelf. In several cases, the wave amplitude decreases by more than 40 %. Northerly (N), northeasterly (NE), and north-northeasterly (NNE) storms stronger than 10 m/s and longer than 12 h are identified as the primary forcing mechanism, particularly in the western CS. Numerical simulations reproduce the observed CTW patterns and show a mostly barotropic structure in winter. Under thermal stratification, the waves exhibit lower energy and slightly faster phase speeds in the simulated events. These combined results provide a clearer view of how CTWs form, travel, and decay along the southern CS shelf.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104787"},"PeriodicalIF":2.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191137","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}
Pub Date : 2026-03-01Epub Date: 2026-01-30DOI: 10.1016/j.rsma.2026.104821
Ilmar Brinkhof , Manu Sistiaga , Bent Herrmann , Neil Anders , Jesse Brinkhof
In the Barents Sea demersal trawl fishery targeting gadoids it is mandatory to use a fish sorting grid with a minimum bar spacing of 55 mm. However, earlier studies have reported low catch efficiency for this gear, resulting in increased fishing effort, higher fuel use and greenhouse gas emissions, and seabed disturbance to catch available quotas. The present study investigated the effect of reduced grid bar spacing on capture patterns and efficiency. The results demonstrated that reducing grid bar spacing by 10 mm improved catch efficiency for cod (Gadus morhua), haddock (Melanogrammus aeglefinus) and saithe (Pollachius virens) by 51 %, > 100 %, and > 300 %, respectively, measured in numbers of fish. Despite the reduction in bar spacing, the fraction of undersized fish captured remained low and did not exceed 2 % for any of the species investigated. Quantified by weight, a 10 mm reduction in grid bar spacing resulted in 26 %, 82 %, and > 200 % increase in catch for commercially sized cod, haddock and saithe, respectively, with the fraction of undersized fish not exceeding 1 %. Since the fraction of undersized fish was low for all species, the use of non-selective codends that promote catch quality may be a future viable option. Our results indicate that environmental impacts could be reduced and profitability increased by allowing fishers to use sorting grids with smaller bar spacings. However, additional studies are needed to confirm our results can be extrapolated beyond our case study, as they depend on the size structure of the fish populations encountered during the trials.
{"title":"Make fisheries better by reducing size selectivity in the North-east Arctic bottom trawl fishery","authors":"Ilmar Brinkhof , Manu Sistiaga , Bent Herrmann , Neil Anders , Jesse Brinkhof","doi":"10.1016/j.rsma.2026.104821","DOIUrl":"10.1016/j.rsma.2026.104821","url":null,"abstract":"<div><div>In the Barents Sea demersal trawl fishery targeting gadoids it is mandatory to use a fish sorting grid with a minimum bar spacing of 55 mm. However, earlier studies have reported low catch efficiency for this gear, resulting in increased fishing effort, higher fuel use and greenhouse gas emissions, and seabed disturbance to catch available quotas. The present study investigated the effect of reduced grid bar spacing on capture patterns and efficiency. The results demonstrated that reducing grid bar spacing by 10 mm improved catch efficiency for cod (<em>Gadus morhua</em>), haddock (<em>Melanogrammus aeglefinus</em>) and saithe (<em>Pollachius virens</em>) by 51 %, > 100 %, and > 300 %, respectively, measured in numbers of fish. Despite the reduction in bar spacing, the fraction of undersized fish captured remained low and did not exceed 2 % for any of the species investigated. Quantified by weight, a 10 mm reduction in grid bar spacing resulted in 26 %, 82 %, and > 200 % increase in catch for commercially sized cod, haddock and saithe, respectively, with the fraction of undersized fish not exceeding 1 %. Since the fraction of undersized fish was low for all species, the use of non-selective codends that promote catch quality may be a future viable option. Our results indicate that environmental impacts could be reduced and profitability increased by allowing fishers to use sorting grids with smaller bar spacings. However, additional studies are needed to confirm our results can be extrapolated beyond our case study, as they depend on the size structure of the fish populations encountered during the trials.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104821"},"PeriodicalIF":2.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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