Pub Date : 2026-01-31DOI: 10.1016/j.rsma.2026.104825
Tubagus Solihuddin , Hadiwijaya L. Salim , Semeidi Husrin , Terry L. Kepel , Adi Prasetyo , Mohammad Farid
The North Coast of Java, the most developed region in Indonesia, has recently undergone environmental degradation primarily due to uncontrolled exploitation and significant changes in land cover, resulting in coastal erosion, accretion, flooding, and land subsidence. This study aims to quantify shoreline changes, assess their impact on land cover, and suggest governance strategies. The study utilized integrated multispectral bands from satellite imagery alongside the digital shoreline analysis system to evaluate shoreline changes and conduct statistical measurements based on satellite data. Sayung in Demak, Central Java, exemplifies a highly eroded coastline, with a maximum linear regression rate of −289.2 m/yr. The total lengths of eroded and accreted shorelines along the North Coast of Java are approximately 1305.3 km and 678.7 km, respectively. The total areas of eroded and accreted shorelines are documented as 162.1 km² and 130.1 km², respectively. Human activities, including river modifications and mangrove removal, significantly disrupt natural coastal dynamics, affecting erosion and accretion processes. Furthermore, coastal structures (ports, breakwaters, groins, seawalls, and jetties) significantly influence the dynamic of the coastline and are strongly linked to rapid development in urban areas. The North Coast of Java also experiences sea level rise and land subsidence, which exacerbates coastal flooding in specific areas. Based on the findings, a coordinated institution at the national level (North Coast of Java Authority) is necessary to tackle the complexity of coastal management and in setting the new regulatory framework regarding the initiative of giant seawall constructions along the North Coast of Java.
{"title":"Coastal dynamics along the Northern Coast of Java, Indonesia: Scales, impacts, and governance strategies","authors":"Tubagus Solihuddin , Hadiwijaya L. Salim , Semeidi Husrin , Terry L. Kepel , Adi Prasetyo , Mohammad Farid","doi":"10.1016/j.rsma.2026.104825","DOIUrl":"10.1016/j.rsma.2026.104825","url":null,"abstract":"<div><div>The North Coast of Java, the most developed region in Indonesia, has recently undergone environmental degradation primarily due to uncontrolled exploitation and significant changes in land cover, resulting in coastal erosion, accretion, flooding, and land subsidence. This study aims to quantify shoreline changes, assess their impact on land cover, and suggest governance strategies. The study utilized integrated multispectral bands from satellite imagery alongside the digital shoreline analysis system to evaluate shoreline changes and conduct statistical measurements based on satellite data. Sayung in Demak, Central Java, exemplifies a highly eroded coastline, with a maximum linear regression rate of −289.2 m/yr. The total lengths of eroded and accreted shorelines along the North Coast of Java are approximately 1305.3 km and 678.7 km, respectively. The total areas of eroded and accreted shorelines are documented as 162.1 km² and 130.1 km², respectively. Human activities, including river modifications and mangrove removal, significantly disrupt natural coastal dynamics, affecting erosion and accretion processes. Furthermore, coastal structures (ports, breakwaters, groins, seawalls, and jetties) significantly influence the dynamic of the coastline and are strongly linked to rapid development in urban areas. The North Coast of Java also experiences sea level rise and land subsidence, which exacerbates coastal flooding in specific areas. Based on the findings, a coordinated institution at the national level (North Coast of Java Authority) is necessary to tackle the complexity of coastal management and in setting the new regulatory framework regarding the initiative of giant seawall constructions along the North Coast of Java.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104825"},"PeriodicalIF":2.4,"publicationDate":"2026-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191138","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 : 2026-01-31DOI: 10.1016/j.rsma.2026.104823
Daimo Villegas-Inostroza, Isabel Pizarro-Veas, Kelly Nuñez-Pérez
Heavy metal contamination in coastal environments represents a significant threat to aquatic ecosystems and human health. Such is the case with the commune of Taltal, a place which has two tailings’ piles within the coastal urban area in a recreational zone and adjacent to a school. This study evaluates the distribution and retention mechanisms of heavy metals in coastal sediments of northern Chile, considering different areas (Cifuncho, Paposo, Playa Atacama and Tierra del Morro) and environmental matrices (sediment and soil), the influence of the granulometric fraction (2000, 250 and 63 µm) and physicochemical parameters. ANOVA, boxplots and Pearson correlation matrices were applied. The results show that the Playa Atacama sector has the highest metal load, with high concentrations of Arsenic (72.15 mg/kg), Copper (4576.36 mg/kg), Lead (1841.17 mg/kg), Zinc (388.31 mg/kg), Ni (107,7 mg/kg), Cr (261 mg/kg) and Mercury (1.94 mg/kg), associated with the presence of mining liabilities in the area. The fine fraction of the sediment (63 µm) concentrated the highest levels of metals in the order of 70,mg/kg for arsenic up to 4500 mg/kg for copper and 1800 mg/kg for lead, standing out as a critical unit for mobility and environmental risk studies. The correlation heat map revealed significant associations (r > 0.90) between metals and parameters such as organic carbon, organic matter, pH and conductivity, suggesting immobilization mechanisms under alkaline and oxidizing conditions. In conclusion, playa Atacama and Paposo showed the highest levels of As, Cu and Pb.
{"title":"Heavy metal contamination in the commune of Taltal- Chile: Analysis of soils and sediments in different granulometric fractions","authors":"Daimo Villegas-Inostroza, Isabel Pizarro-Veas, Kelly Nuñez-Pérez","doi":"10.1016/j.rsma.2026.104823","DOIUrl":"10.1016/j.rsma.2026.104823","url":null,"abstract":"<div><div>Heavy metal contamination in coastal environments represents a significant threat to aquatic ecosystems and human health. Such is the case with the commune of Taltal, a place which has two tailings’ piles within the coastal urban area in a recreational zone and adjacent to a school. This study evaluates the distribution and retention mechanisms of heavy metals in coastal sediments of northern Chile, considering different areas (Cifuncho, Paposo, Playa Atacama and Tierra del Morro) and environmental matrices (sediment and soil), the influence of the granulometric fraction (2000, 250 and 63 µm) and physicochemical parameters. ANOVA, boxplots and Pearson correlation matrices were applied. The results show that the Playa Atacama sector has the highest metal load, with high concentrations of Arsenic (72.15 mg/kg), Copper (4576.36 mg/kg), Lead (1841.17 mg/kg), Zinc (388.31 mg/kg), Ni (107,7 mg/kg), Cr (261 mg/kg) and Mercury (1.94 mg/kg), associated with the presence of mining liabilities in the area. The fine fraction of the sediment (63 µm) concentrated the highest levels of metals in the order of 70,mg/kg for arsenic up to 4500 mg/kg for copper and 1800 mg/kg for lead, standing out as a critical unit for mobility and environmental risk studies. The correlation heat map revealed significant associations (r > 0.90) between metals and parameters such as organic carbon, organic matter, pH and conductivity, suggesting immobilization mechanisms under alkaline and oxidizing conditions. In conclusion, playa Atacama and Paposo showed the highest levels of As, Cu and Pb.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104823"},"PeriodicalIF":2.4,"publicationDate":"2026-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191216","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}
Methane (), the second most impactful greenhouse gas, is often underrepresented in coastal environmental assessments. This study examined concentrations in surface water and sediment porewater across Jakarta Bay, a highly urbanized estuary receiving wastewater from 13 rivers. Surveys conducted in July, August, and October 2023 identified two major hotspots: the eastern region near Marunda (surface: 2.61 μmol L⁻¹; porewater: 27.43 μmol L⁻¹) and the western region near Muara Angke–Pantai Indah Kapuk, a newly developed urban coastal zone (1.41 and 13.31 μmol L⁻¹, respectively). In the eastern bay, elevated levels were strongly associated with low dissolved oxygen () and high phosphate (), indicating eutrophication-driven methanogenesis under hypoxic conditions. In contrast, the western bay exhibited a different dynamic: concentrations were higher closer to the coastline and negatively correlated with , despite surface waters being well-oxygenated. This paradox suggests vertical decoupling between surface and benthic conditions, where methane likely originates from deeper anoxic sediments, potentially mobilized by disturbances such as dredging, land reclamation, and the historical loss of mangroves. Elevated dissolved inorganic carbon (DIC) and low sediment further support the presence of intense microbial respiration and organic matter degradation. Seasonally, fluxes in the east declined from July to October, while fluxes in the west increased, highlighting contrasting temporal controls. These findings reveal dual -generating mechanisms in Jakarta Bay, eutrophication in the east and anthropogenic sediment disturbance in the west, and underscore the importance of integrating spatial and seasonal dynamics into coastal monitoring and mitigation strategies.
{"title":"New insights into the distribution of methane from sediment and surface waters in urban tropical bay (Jakarta-Indonesia)","authors":"Irfan Kampono , Fadjar Hidayat , Nining Sari Ningsih , Yaya Ihya Ulumuddin , Hanif Budi Prayitno , Aditya R. Kartadikaria","doi":"10.1016/j.rsma.2026.104799","DOIUrl":"10.1016/j.rsma.2026.104799","url":null,"abstract":"<div><div>Methane (<span><math><mrow><mi>CH</mi><mi>₄</mi></mrow></math></span>), the second most impactful greenhouse gas, is often underrepresented in coastal environmental assessments. This study examined <span><math><mrow><mi>CH</mi><mi>₄</mi></mrow></math></span> concentrations in surface water and sediment porewater across Jakarta Bay, a highly urbanized estuary receiving wastewater from 13 rivers. Surveys conducted in July, August, and October 2023 identified two major <span><math><mrow><mi>CH</mi><mi>₄</mi></mrow></math></span> hotspots: the eastern region near Marunda (surface: 2.61 μmol L⁻¹; porewater: 27.43 μmol L⁻¹) and the western region near Muara Angke–Pantai Indah Kapuk, a newly developed urban coastal zone (1.41 and 13.31 μmol L⁻¹, respectively). In the eastern bay, elevated <span><math><mrow><mi>CH</mi><mi>₄</mi></mrow></math></span> levels were strongly associated with low dissolved oxygen (<span><math><mi>DO</mi></math></span>) and high phosphate (<span><math><mrow><mi>PO</mi><mi>₄</mi><mo>−</mo><mi>P</mi></mrow></math></span>), indicating eutrophication-driven methanogenesis under hypoxic conditions. In contrast, the western bay exhibited a different dynamic: <span><math><mrow><mi>CH</mi><mi>₄</mi></mrow></math></span> concentrations were higher closer to the coastline and negatively correlated with <span><math><mi>DO</mi></math></span>, despite surface waters being well-oxygenated. This paradox suggests vertical decoupling between surface and benthic conditions, where methane likely originates from deeper anoxic sediments, potentially mobilized by disturbances such as dredging, land reclamation, and the historical loss of mangroves. Elevated dissolved inorganic carbon (DIC) and low sediment <span><math><mi>pH</mi></math></span> further support the presence of intense microbial respiration and organic matter degradation. Seasonally, <span><math><mrow><mi>CH</mi><mi>₄</mi></mrow></math></span> fluxes in the east declined from July to October, while fluxes in the west increased, highlighting contrasting temporal controls. These findings reveal dual <span><math><mrow><mi>CH</mi><mi>₄</mi></mrow></math></span> -generating mechanisms in Jakarta Bay, eutrophication in the east and anthropogenic sediment disturbance in the west, and underscore the importance of integrating spatial and seasonal <span><math><mrow><mi>CH</mi><mi>₄</mi></mrow></math></span> dynamics into coastal monitoring and mitigation strategies.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104799"},"PeriodicalIF":2.4,"publicationDate":"2026-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191215","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 : 2026-01-31DOI: 10.1016/j.rsma.2026.104824
Elena G. Panina , Alexey V. Smirnov , Elena Rybakova , Jean-François Hamel , Annie Mercier , Antonina Kremenetskaia
A new holothuroid, Psolus comanchei sp. nov., is described from methane seeps on the Koryak slope and non-vent (background) communities of the Piip Volcano in the bathyal western Bering Sea. The new species differs by lacking ossicles in the sole skin and presenting mushroom-cap-shaped ossicles on the test, tentacles and tube feet. Molecular analyses (COI, 16S) confirm P. comanchei sp. nov. is distinct from congeners but closely related to North Pacific, Arctic, and Atlantic species (P. eximius, P. chitonoides, P. fabricii, P. peronii and P. phantapus) and an unidentified Psolus sp. from the Emperor Seamount Chain. COI data also confirm its presence in the East Pacific. Our phylogeny challenges the monophyly of Psolus, revealing at least two polyphyletic lineages. The close relationships among North Pacific, amphiboreal, and boreal-Arctic species suggest a North Pacific origin for this clade. Although common near seeps, P. comanchei sp. nov. is not obligate to reducing environments.
在白令海西部深海区Piip火山Koryak斜坡和非喷口（背景）群落的甲烷渗漏中，描述了一种新的holothroid， Psolus comanchei sp. nov.。新物种的不同之处在于脚底皮肤上没有小骨，而在脚上有蘑菇帽状的小骨，触角和管状脚。分子分析（COI, 16S）证实P. comanchei sp. 11 .与同系物不同，但与北太平洋，北极和大西洋的物种（P. eximius， P. chitonoides， P. fabricii， P. peronii和P. phantapus）和来自皇帝海山链的未识别的Psolus sp.密切相关。COI数据也证实了它在东太平洋的存在。我们的系统发育挑战了Psolus的单系性，揭示了至少两个多系谱系。北太平洋、两栖动物和北方-北极物种之间的密切关系表明，这一进化支起源于北太平洋。虽然常见的近渗漏，P. comanchei sp. 11 .没有义务减少环境。
{"title":"A new species of Psolus (Dendrochirotida: Holothuroidea) from methane seeps and non-chemosynthetic environments of the bathyal western Bering Sea with notes on phylogeny and geography of the genus","authors":"Elena G. Panina , Alexey V. Smirnov , Elena Rybakova , Jean-François Hamel , Annie Mercier , Antonina Kremenetskaia","doi":"10.1016/j.rsma.2026.104824","DOIUrl":"10.1016/j.rsma.2026.104824","url":null,"abstract":"<div><div>A new holothuroid, <em>Psolus comanchei</em> sp. nov., is described from methane seeps on the Koryak slope and non-vent (background) communities of the Piip Volcano in the bathyal western Bering Sea. The new species differs by lacking ossicles in the sole skin and presenting mushroom-cap-shaped ossicles on the test, tentacles and tube feet. Molecular analyses (<em>COI</em>, <em>16S</em>) confirm <em>P. comanchei</em> sp. nov. is distinct from congeners but closely related to North Pacific, Arctic, and Atlantic species (<em>P. eximius, P. chitonoides, P. fabricii, P. peronii</em> and <em>P. phantapus</em>) and an unidentified <em>Psolus</em> sp. from the Emperor Seamount Chain. <em>COI</em> data also confirm its presence in the East Pacific. Our phylogeny challenges the monophyly of <em>Psolus</em>, revealing at least two polyphyletic lineages. The close relationships among North Pacific, amphiboreal, and boreal-Arctic species suggest a North Pacific origin for this clade. Although common near seeps, <em>P. comanchei</em> sp. nov. is not obligate to reducing environments.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104824"},"PeriodicalIF":2.4,"publicationDate":"2026-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191286","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 : 2026-01-30DOI: 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":"2026-01-30","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 : 2026-01-30DOI: 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":"2026-01-30","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}
Pub Date : 2026-01-29DOI: 10.1016/j.rsma.2026.104822
Hai Li , Fang Yang , Xiang Zhang , Yuzhuo Liao , Yuan Li , Puqing Song , Shigang Liu , Longshan Lin
The identification of ecological corridors is crucial for mitigating habitat fragmentation and conserving biodiversity. This study pioneered the use of environmental DNA (eDNA) metabarcoding to identify potential fish ecological corridors in Xiamen Bay, a subtropical semi-enclosed bay in Southeast China, addressing the challenge of delineating marine corridors for mobile species. We collected surface and bottom water samples from 29 sites across 10 transects during winter and summer of 2021. eDNA metabarcoding of the 12S rRNA gene (MiFish-U) revealed distinct seasonal shifts in fish community composition, with 46 and 112 species detected in winter and summer, respectively. The communities were predominantly composed of warm-water and temperate species, with a significant proportion of migratory taxa. Alpha and beta diversity analyses confirmed significant seasonal variations in community structure. Spatial analysis of habitat nodes identified ecological corridors with clear seasonal dynamics. In winter, a primary corridor connected the estuary to the western waters and Tong'an Bay, while a secondary corridor linked the Jiulong River Estuary to the southern waters of Xiamen Island. During summer, both corridors extended eastward, with the primary corridor reaching through the waters around Dadeng Island to the eastern waters and the secondary corridor expanding to the eastern waters of Xiamen Island. These corridors likely facilitate various critical ecological processes. Our findings demonstrate that eDNA metabarcoding is a powerful, spatially explicit tool for identifying ecological corridors in complex marine environments, offering a novel and efficient approach to inform marine spatial planning and conservation strategies.
{"title":"Delineating fish ecological corridors in a subtropical bay using eDNA metabarcoding: A case study from Xiamen Bay, China","authors":"Hai Li , Fang Yang , Xiang Zhang , Yuzhuo Liao , Yuan Li , Puqing Song , Shigang Liu , Longshan Lin","doi":"10.1016/j.rsma.2026.104822","DOIUrl":"10.1016/j.rsma.2026.104822","url":null,"abstract":"<div><div>The identification of ecological corridors is crucial for mitigating habitat fragmentation and conserving biodiversity. This study pioneered the use of environmental DNA (eDNA) metabarcoding to identify potential fish ecological corridors in Xiamen Bay, a subtropical semi-enclosed bay in Southeast China, addressing the challenge of delineating marine corridors for mobile species. We collected surface and bottom water samples from 29 sites across 10 transects during winter and summer of 2021. eDNA metabarcoding of the 12S rRNA gene (MiFish-U) revealed distinct seasonal shifts in fish community composition, with 46 and 112 species detected in winter and summer, respectively. The communities were predominantly composed of warm-water and temperate species, with a significant proportion of migratory taxa. Alpha and beta diversity analyses confirmed significant seasonal variations in community structure. Spatial analysis of habitat nodes identified ecological corridors with clear seasonal dynamics. In winter, a primary corridor connected the estuary to the western waters and Tong'an Bay, while a secondary corridor linked the Jiulong River Estuary to the southern waters of Xiamen Island. During summer, both corridors extended eastward, with the primary corridor reaching through the waters around Dadeng Island to the eastern waters and the secondary corridor expanding to the eastern waters of Xiamen Island. These corridors likely facilitate various critical ecological processes. Our findings demonstrate that eDNA metabarcoding is a powerful, spatially explicit tool for identifying ecological corridors in complex marine environments, offering a novel and efficient approach to inform marine spatial planning and conservation strategies.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104822"},"PeriodicalIF":2.4,"publicationDate":"2026-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191287","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 : 2026-01-28DOI: 10.1016/j.rsma.2026.104819
Haibin Sun , Yuanren Liang , Qingwei Bu , Lei Yang , Jianfeng Tang , Yaoyang Xu
In aquatic ecosystems, tri-organophosphate esters and their di-metabolites are commonly found and may present significant ecological risks. Nonetheless, there is still a scarcity of data regarding the contamination characteristics and how OPEs and their metabolites partition at the interface between sediment and water. This research aimed to examine the spatial variation, interface exchange, and diffusion processes of 13 tri-OPEs and 5 di-OPEs within the surface water and sediment of the Yong River, which is situated in heavily urbanized regions of eastern China. The concentration levels of tri-OPEs in the aquatic environment ranged from 428.84 to 4024.01 ng/L, whereas concentrations of di-OPEs spanned from 92.6 to 440.39 ng/L. The most prevalent category of contaminants identified were Chlorinated OPEs. In the sediment, the concentration levels varied from 0.16 to 2400.5 ng/g (dw), with tributyl phosphate (TnBP) being the primary constituent. Fugacity fraction analysis indicates that most OPEs, including TMP, TEP, and TCEP, are likely to migrate into the water phase. Others, such as TiBP, TBEP, TCIPP, and TPHP, tend to maintain equilibrium at the sediment-water interface. The composition of the compound in terms of carbon atom count and the level of soot carbon present in the sediment significantly influence the dispersal patterns of OPEs. The analysis of potential sources revealed that the main contributors to tri-OPEs stemmed from discharges linked to wastewater treatment facilities and various industrial processes. Conversely, di-OPEs emerged primarily from industrial manufacturing and the breakdown of tri-OPEs. The analysis of ecological risks across multiple levels indicated that tris(1,3-dichloro-2-propyl) phosphate (TDCP) represents a minimal threat to aquatic ecosystems. These results can provide insights into the dynamics of OPE and their metabolites within urban river water ecosystems that experience significant human influence.
{"title":"Organophosphate triesters and diesters in surface waters and sediments of an urbanized river in Eastern China: Spatial patterns and ecological implications","authors":"Haibin Sun , Yuanren Liang , Qingwei Bu , Lei Yang , Jianfeng Tang , Yaoyang Xu","doi":"10.1016/j.rsma.2026.104819","DOIUrl":"10.1016/j.rsma.2026.104819","url":null,"abstract":"<div><div>In aquatic ecosystems, tri-organophosphate esters and their di-metabolites are commonly found and may present significant ecological risks. Nonetheless, there is still a scarcity of data regarding the contamination characteristics and how OPEs and their metabolites partition at the interface between sediment and water. This research aimed to examine the spatial variation, interface exchange, and diffusion processes of 13 tri-OPEs and 5 di-OPEs within the surface water and sediment of the Yong River, which is situated in heavily urbanized regions of eastern China. The concentration levels of tri-OPEs in the aquatic environment ranged from 428.84 to 4024.01 ng/L, whereas concentrations of di-OPEs spanned from 92.6 to 440.39 ng/L. The most prevalent category of contaminants identified were Chlorinated OPEs. In the sediment, the concentration levels varied from 0.16 to 2400.5 ng/g (dw), with tributyl phosphate (TnBP) being the primary constituent. Fugacity fraction analysis indicates that most OPEs, including TMP, TEP, and TCEP, are likely to migrate into the water phase. Others, such as TiBP, TBEP, TCIPP, and TPHP, tend to maintain equilibrium at the sediment-water interface. The composition of the compound in terms of carbon atom count and the level of soot carbon present in the sediment significantly influence the dispersal patterns of OPEs. The analysis of potential sources revealed that the main contributors to tri-OPEs stemmed from discharges linked to wastewater treatment facilities and various industrial processes. Conversely, di-OPEs emerged primarily from industrial manufacturing and the breakdown of tri-OPEs. The analysis of ecological risks across multiple levels indicated that tris(1,3-dichloro-2-propyl) phosphate (TDCP) represents a minimal threat to aquatic ecosystems. These results can provide insights into the dynamics of OPE and their metabolites within urban river water ecosystems that experience significant human influence.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104819"},"PeriodicalIF":2.4,"publicationDate":"2026-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146057419","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 : 2026-01-28DOI: 10.1016/j.rsma.2026.104817
Nicole B. Rowberry , Arthur D. Barraza , Colin J. Limpus , Jason P. van de Merwe , Kimberly A. Finlayson
Green sea turtles (Chelonia mydas) have high ecological, economic and cultural importance, and their high fidelity to foraging grounds and long lifespan make them good bioindicators of trace element pollution. Trace elements accumulate in green turtles through food, and are linked with disease and abnormalities. Previous studies suggest higher concentrations of trace elements within inshore locations, closer to anthropogenic activities and coastal run-off, compared to remote offshore sites. This project investigated trace element accumulation in blood of green turtles foraging in locations of differing chemical input. Blood was collected from green turtles foraging at three sites: Port Curtis (adjacent to industrial port), Heron Reef (adjacent to tourist resort and research station), and Hoskyn/Fairfax reefs (remote offshore reefs). The blood was acid digested and analysed using ICP-MS for trace element concentrations. Concentrations of individual elements were statistically analysed for differences between locations, and a principal components analysis was used to assess multivariate differences between locations. Trace element concentrations were also compared to reference intervals (RIs) from the literature. Antimony, cobalt, manganese, and molybdenum concentrations were significantly higher in Port Curtis turtles, and elevated above the reference intervals. Arsenic, selenium and cadmium were significantly higher in both offshore locations compared to Port Curtis, and elevated above reference intervals. Vanadium was significantly higher in Hoskyn/Fairfax turtles, and elevated above reference intervals. Principal component analyses found a distinct separation between Port Curtis and the Capricorn Bunker, as well as some separation between Heron and Hoskyn/Fairfax reefs. The higher concentrations of elements in turtle blood compared to the reference intervals, and other global populations, demonstrates natural and anthropogenic sources of elements are accumulating in these green turtles at elevated levels, with suspected risk to their health and the health of the marine environment.
{"title":"Trace element accumulation in green turtles (Chelonia mydas) foraging in locations of differing chemical input","authors":"Nicole B. Rowberry , Arthur D. Barraza , Colin J. Limpus , Jason P. van de Merwe , Kimberly A. Finlayson","doi":"10.1016/j.rsma.2026.104817","DOIUrl":"10.1016/j.rsma.2026.104817","url":null,"abstract":"<div><div>Green sea turtles (<em>Chelonia mydas</em>) have high ecological, economic and cultural importance, and their high fidelity to foraging grounds and long lifespan make them good bioindicators of trace element pollution. Trace elements accumulate in green turtles through food, and are linked with disease and abnormalities. Previous studies suggest higher concentrations of trace elements within inshore locations, closer to anthropogenic activities and coastal run-off, compared to remote offshore sites. This project investigated trace element accumulation in blood of green turtles foraging in locations of differing chemical input. Blood was collected from green turtles foraging at three sites: Port Curtis (adjacent to industrial port), Heron Reef (adjacent to tourist resort and research station), and Hoskyn/Fairfax reefs (remote offshore reefs). The blood was acid digested and analysed using ICP-MS for trace element concentrations. Concentrations of individual elements were statistically analysed for differences between locations, and a principal components analysis was used to assess multivariate differences between locations. Trace element concentrations were also compared to reference intervals (RIs) from the literature. Antimony, cobalt, manganese, and molybdenum concentrations were significantly higher in Port Curtis turtles, and elevated above the reference intervals. Arsenic, selenium and cadmium were significantly higher in both offshore locations compared to Port Curtis, and elevated above reference intervals. Vanadium was significantly higher in Hoskyn/Fairfax turtles, and elevated above reference intervals. Principal component analyses found a distinct separation between Port Curtis and the Capricorn Bunker, as well as some separation between Heron and Hoskyn/Fairfax reefs. The higher concentrations of elements in turtle blood compared to the reference intervals, and other global populations, demonstrates natural and anthropogenic sources of elements are accumulating in these green turtles at elevated levels, with suspected risk to their health and the health of the marine environment.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104817"},"PeriodicalIF":2.4,"publicationDate":"2026-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146090359","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}
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":"2026-01-28","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}
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