Pub Date : 2026-02-01Epub Date: 2026-01-07DOI: 10.1016/j.rsma.2026.104762
Adebayo Solanke , Michael Martínez-Colón , Olugbenga T. Fajemila , Charles Jagoe
The concentrations of 12 (As, Cd, Co, Cu, Cr, Fe, Pb, Hg, Ni, Se, Ti, and Zn) potentially toxic elements (PTEs) from Apalachicola Bay were determined to assess the degree of contamination of surface sediments coupled with benthic foraminifera used as pollution bioindicators. Although the overall conditions of the bay, with respect to PTEs, are not impacted (PLIestuary <1), the river sites are “polluted” (PLIriver >1). In addition, a “Bad” ecological quality status, based on organic matter content (4.43–12.36 %) prevailed at the bay sites and this is critical since organic-bound PTEs become readily bioavailable to benthic foraminifera. This is represented by the number of species (<6) and diversity (<1.53) values that were uncharacteristically low even for a stressed environment whose assemblage, controlled by mud-TOC (positively) and organic-bound Cd-Se (negatively), was dominated by Ammonia parkinsoniana and Cribroelphidium gunteri. Based on their respective relative abundances, the former was tolerant to organic-bound Ni-Cr-Cu while the latter was to Ni-Co-Cr-Cu-Zn. The bay is polluted with respected to Se (total concentration: 6.06–261.24 mg/kg) given its “high extreme” contamination factor (CF >6). Although the toxicological effects of Se on benthic foraminifera are unknown, its bioavailable counterparts across the bay exerted negative impacts on their ecological distribution.
{"title":"Potential effects of organic matter-bound toxic elements on benthic foraminifera from Apalachicola Bay sediments (Florida, USA)","authors":"Adebayo Solanke , Michael Martínez-Colón , Olugbenga T. Fajemila , Charles Jagoe","doi":"10.1016/j.rsma.2026.104762","DOIUrl":"10.1016/j.rsma.2026.104762","url":null,"abstract":"<div><div>The concentrations of 12 (As, Cd, Co, Cu, Cr, Fe, Pb, Hg, Ni, Se, Ti, and Zn) potentially toxic elements (PTEs) from Apalachicola Bay were determined to assess the degree of contamination of surface sediments coupled with benthic foraminifera used as pollution bioindicators. Although the overall conditions of the bay, with respect to PTEs, are not impacted (PLI<sub>estuary</sub> <1), the river sites are “polluted” (PLI<sub>river</sub> >1). In addition, a “Bad” ecological quality status, based on organic matter content (4.43–12.36 %) prevailed at the bay sites and this is critical since organic-bound PTEs become readily bioavailable to benthic foraminifera. This is represented by the number of species (<6) and diversity (<1.53) values that were uncharacteristically low even for a stressed environment whose assemblage, controlled by mud-TOC (positively) and organic-bound Cd-Se (negatively), was dominated by <em>Ammonia parkinsoniana</em> and <em>Cribroelphidium gunteri</em>. Based on their respective relative abundances, the former was tolerant to organic-bound Ni-Cr-Cu while the latter was to Ni-Co-Cr-Cu-Zn. The bay is polluted with respected to Se (total concentration: 6.06–261.24 mg/kg) given its “high extreme” contamination factor (CF >6). Although the toxicological effects of Se on benthic foraminifera are unknown, its bioavailable counterparts across the bay exerted negative impacts on their ecological distribution.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"94 ","pages":"Article 104762"},"PeriodicalIF":2.4,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145980842","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 : 2026-02-01Epub Date: 2026-01-27DOI: 10.1016/j.rsma.2026.104811
P. Thamarai, A. Saravanan, P.R. Yaashikaa
The rapid expansion of global industrialization and population growth has intensified water contamination, making it essential to explore sustainable remediation strategies. Among various natural biosorbents, seaweeds have emerged as promising candidates for pollutant removal due to their unique biochemical composition and high biosorption efficiency. Naturally occurring seaweeds play an essential role in maintaining ecological balance by passively accumulating heavy metals and organic pollutants, whereas cultivated seaweeds can be optimized for targeted clean water restoration and wastewater treatment applications. Their abundant availability, eco-friendliness, and cost-effectiveness further enhance their applicability in large-scale water treatment. This review examines the occurrence of major toxic pollutants in water bodies and their environmental consequences while critically evaluating the potential of seaweed-based bioremediation. The specific mechanisms of removal include ion exchange and complexation with carboxyl, hydroxyl, and sulfate groups for heavy metals; electrostatic attraction and π–π interactions for synthetic dyes; hydrogen bonding and hydrophobic interactions for phenolic compounds; and adsorption through van der Waals forces and surface complexation for pharmaceutical residues. Additionally, factors influencing biosorption efficiency, including biosorbent dosage, initial pollutant concentration, pH, and temperature, are analyzed. Findings from this study indicate that seaweed biomass demonstrates significant adsorption capacities across pollutant classes, with desorption and regeneration studies confirming its reusability. However, challenges such as large-scale implementation, regeneration efficiency, and cost-effectiveness remain critical hurdles. The review highlights the necessity for interdisciplinary approaches to optimize seaweed-based remediation, including process modifications, composite development, and hybrid treatment systems. Overall, seaweed-based remediation represents a sustainable and practical solution for mitigating water pollution and advancing eco-friendly wastewater treatment.
{"title":"Exploring the role of seaweeds in environmental pollution mitigation for clean water: Mechanisms of adsorption and desorption","authors":"P. Thamarai, A. Saravanan, P.R. Yaashikaa","doi":"10.1016/j.rsma.2026.104811","DOIUrl":"10.1016/j.rsma.2026.104811","url":null,"abstract":"<div><div>The rapid expansion of global industrialization and population growth has intensified water contamination, making it essential to explore sustainable remediation strategies. Among various natural biosorbents, seaweeds have emerged as promising candidates for pollutant removal due to their unique biochemical composition and high biosorption efficiency. Naturally occurring seaweeds play an essential role in maintaining ecological balance by passively accumulating heavy metals and organic pollutants, whereas cultivated seaweeds can be optimized for targeted clean water restoration and wastewater treatment applications. Their abundant availability, eco-friendliness, and cost-effectiveness further enhance their applicability in large-scale water treatment. This review examines the occurrence of major toxic pollutants in water bodies and their environmental consequences while critically evaluating the potential of seaweed-based bioremediation. The specific mechanisms of removal include ion exchange and complexation with carboxyl, hydroxyl, and sulfate groups for heavy metals; electrostatic attraction and π–π interactions for synthetic dyes; hydrogen bonding and hydrophobic interactions for phenolic compounds; and adsorption through van der Waals forces and surface complexation for pharmaceutical residues. Additionally, factors influencing biosorption efficiency, including biosorbent dosage, initial pollutant concentration, pH, and temperature, are analyzed. Findings from this study indicate that seaweed biomass demonstrates significant adsorption capacities across pollutant classes, with desorption and regeneration studies confirming its reusability. However, challenges such as large-scale implementation, regeneration efficiency, and cost-effectiveness remain critical hurdles. The review highlights the necessity for interdisciplinary approaches to optimize seaweed-based remediation, including process modifications, composite development, and hybrid treatment systems. Overall, seaweed-based remediation represents a sustainable and practical solution for mitigating water pollution and advancing eco-friendly wastewater treatment.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"94 ","pages":"Article 104811"},"PeriodicalIF":2.4,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146078847","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 : 2026-02-01Epub Date: 2026-01-23DOI: 10.1016/j.rsma.2026.104797
Agatha C.S. Fernandes , Tito Cesar Marques de Almeida , Cristiana S. Serejo
The present study deals with the diversity and characterization of amphipod and isopod fauna associated with three different substrates, Perna perna beds, Phyllochaetopterus aggregates, and artificial substrate from the Cagarras Islands Natural Monument (MoNa Cagarras), and surrounding waters. Eight sampling stations were taken manually and/or with scuba diving between 2022 and 2023. As a result, 36 species of Amphipoda and 14 species of Isopoda were identified, totaling 50 species. Among the amphipods, there are five new records for the Brazilian coast: Ericthonius punctatus, Caprella scauroides, Carpias bermudensis, Deutella mayeri, and Quadrimaera ascensionis. Amphipods dominated across all substrates, but each substrate type exhibited a different dominance pattern at the family level. The Isopoda group was marked by the abundance of the Janiridae family, including the endemic species Janaira gracilis, and four Carpias species, as well as the family Joeropsididae. Species richness differed among substrates, being highest in Perna perna beds (15–22 species), intermediate in Phyllochaetopterus aggregates (9–17 species), and variable on artificial substrates (9–22 species). The CCA revealed three distinct associations and indicated a clear differentiation between the natural substrates: P. perna supported a diverse assemblage characterized by 10 species with nestling and tubicolous behavior; Phyllochaetopterus association grouped six species with burrowing and detritivorous habit that likely inhabit the sediment accumulated among the polychaete tubes; whereas the artificial substrate exhibited a less diverse assemblage composed of typical fouling, cosmopolitan, and tolerant species. PERMANOVA results corroborated the CCA hypothesis, indicating significant differences among the natural substrate assemblages.
{"title":"Substrate-associated amphipod and isopod fauna in the Cagarras Islands natural monument and surrounding waters, Rio de Janeiro, Brazil","authors":"Agatha C.S. Fernandes , Tito Cesar Marques de Almeida , Cristiana S. Serejo","doi":"10.1016/j.rsma.2026.104797","DOIUrl":"10.1016/j.rsma.2026.104797","url":null,"abstract":"<div><div>The present study deals with the diversity and characterization of amphipod and isopod fauna associated with three different substrates, <em>Perna perna</em> beds, <em>Phyllochaetopterus</em> aggregates, and artificial substrate from the Cagarras Islands Natural Monument (MoNa Cagarras), and surrounding waters. Eight sampling stations were taken manually and/or with scuba diving between 2022 and 2023. As a result, 36 species of Amphipoda and 14 species of Isopoda were identified, totaling 50 species. Among the amphipods, there are five new records for the Brazilian coast: <em>Ericthonius punctatus</em>, <em>Caprella scauroides</em>, <em>Carpias bermudensis, Deutella mayeri,</em> and <em>Quadrimaera ascensionis</em>. Amphipods dominated across all substrates, but each substrate type exhibited a different dominance pattern at the family level. The Isopoda group was marked by the abundance of the Janiridae family, including the endemic species <em>Janaira gracilis</em>, and four <em>Carpias</em> species, as well as the family Joeropsididae. Species richness differed among substrates, being highest in <em>Perna perna</em> beds (15–22 species), intermediate in <em>Phyllochaetopterus</em> aggregates (9–17 species), and variable on artificial substrates (9–22 species). The CCA revealed three distinct associations and indicated a clear differentiation between the natural substrates: <em>P. perna</em> supported a diverse assemblage characterized by 10 species with nestling and tubicolous behavior; <em>Phyllochaetopterus</em> association grouped six species with burrowing and detritivorous habit that likely inhabit the sediment accumulated among the polychaete tubes; whereas the artificial substrate exhibited a less diverse assemblage composed of typical fouling, cosmopolitan, and tolerant species. PERMANOVA results corroborated the CCA hypothesis, indicating significant differences among the natural substrate assemblages.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"94 ","pages":"Article 104797"},"PeriodicalIF":2.4,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146038308","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 : 2026-02-01Epub Date: 2026-01-15DOI: 10.1016/j.rsma.2026.104777
Airam Guerra-Marrero , Ana Espino-Ruano , David Jiménez-Alvarado , Lorena Couce-Montero , José J. Castro
The jaguar round crab, Xantho poressa, is the most important bait shellfish species in the Canary Islands. The aim of the study was to assess the status and population structure of Xantho poressa in the island of Gran Canaria. Specimens of X. poressa were caught monthly between July 2020 and December 2021 in three intertidal areas with different fishing pressure. Males were consistently larger and heavier than females, and the sex ratio was not different to 1:1. Length-weight relationship showed a negative allometric growth pattern in both sexes, and no significant differences were found between the sampling areas on three sides of the island, suggesting the presence of a single population. Ovigerous females were observed throughout the year, with a peak between June and August, indicating a continuous reproductive cycle. The ELEFAN method estimated an asymptotic carapace length of 31.19 mm. Catch per unit effort showed notable differences between the sampled areas, being the highest abundances (10.42 g/m2/gatherer) recorded at the northern coast and the lowest (5.10 g/m2/gatherer) at the southern one. The relative low abundance, particularly in the south coast, in relation with the current allowed catch quotas (1500 g/day/gatherer for artisanal fishing, 200 g/day/gatherer for recreational fishing) and a high number of recreational fishing licenses, indicate that the jaguar round crab stock of the island could be in risk of overfishing. This analysis provided crucial biological information to support management and conservation strategies for X. poressa.
{"title":"Population dynamics and life history traits of the commercially important jaguar round crab Xantho poressa (Olivi, 1792) in Gran Canaria’s Intertidal Zones (Spain)","authors":"Airam Guerra-Marrero , Ana Espino-Ruano , David Jiménez-Alvarado , Lorena Couce-Montero , José J. Castro","doi":"10.1016/j.rsma.2026.104777","DOIUrl":"10.1016/j.rsma.2026.104777","url":null,"abstract":"<div><div>The jaguar round crab, <em>Xantho poressa,</em> is the most important bait shellfish species in the Canary Islands. The aim of the study was to assess the status and population structure of <em>Xantho poressa</em> in the island of Gran Canaria. Specimens of <em>X. poressa</em> were caught monthly between July 2020 and December 2021 in three intertidal areas with different fishing pressure. Males were consistently larger and heavier than females, and the sex ratio was not different to 1:1. Length-weight relationship showed a negative allometric growth pattern in both sexes, and no significant differences were found between the sampling areas on three sides of the island, suggesting the presence of a single population. Ovigerous females were observed throughout the year, with a peak between June and August, indicating a continuous reproductive cycle. The ELEFAN method estimated an asymptotic carapace length of 31.19 mm. Catch per unit effort showed notable differences between the sampled areas, being the highest abundances (10.42 g/m<sup>2</sup>/gatherer) recorded at the northern coast and the lowest (5.10 g/m<sup>2</sup>/gatherer) at the southern one. The relative low abundance, particularly in the south coast, in relation with the current allowed catch quotas (1500 g/day/gatherer for artisanal fishing, 200 g/day/gatherer for recreational fishing) and a high number of recreational fishing licenses, indicate that the jaguar round crab stock of the island could be in risk of overfishing. This analysis provided crucial biological information to support management and conservation strategies for <em>X. poressa</em>.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"94 ","pages":"Article 104777"},"PeriodicalIF":2.4,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145980967","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 : 2026-02-01Epub Date: 2026-01-16DOI: 10.1016/j.rsma.2026.104772
Bahar Bayhan , Ali Kara , Irmak Kurtul , Mert Minaz , Phillip J. Haubrock , Ali Serhan Tarkan , Cüneyt Kaya
In the Mediterranean, Salema Sarpa salpa is among the most economically important coastal fishes. Yet a major gap in its region-specific, and sex-disaggregated data on biology and growth constraining both precise stock assessments and long ecosystem-based fisheries management strategies in the eastern Mediterranean. To address this data deficiency, this study presents an integrative analysis of the species' biological traits, growth parameters, and population structure in İzmir Bay (eastern Aegean Sea, western Türkiye), using a full annual sampling of 319 individuals. Caught individuals comprised 105 males, 82 females, and 132 hermaphrodites. Total length ranged from 16.7 to 38.0 cm, with the most frequent class lengths being 24.1–27.0 cm (29 %) and 27.1–30.0 cm (25 %). The species exhibited isometric growth (b ≈ 3), indicating that weight increases proportionally with length, while gonadosomatic index trends revealed that spawning occurs mainly in autumn. Among the three tested growth models (von Bertalanffy, Gompertz, Logistic), the von Bertalanffy model provided the best fit for the overall population (L∞ ≈ 46.6 cm, K ≈ 0.08), the Gompertz model for males (L∞ ≈ 35.9 cm, K ≈ 0.20), and the von Bertalanffy again for females and hermaphrodites (L∞ ≈ 38–43 cm). These findings indicate proportional length–weight growth and an autumn spawning period. Analysis of otoliths indicated that age-length relationships followed smooth growth patterns, with female size exceeding males in later age classes. Collected data on Sarpa salpa in İzmir Bay provides valuable baseline data for this species’ regional biology; knowledge crucial to fishery management, stock assessment, and ecological monitoring that may serve as a foundation for sustainable conservation of the Aegean Sea.
{"title":"Growth study of Sarpa salpa in the Aegean Sea using three growth models","authors":"Bahar Bayhan , Ali Kara , Irmak Kurtul , Mert Minaz , Phillip J. Haubrock , Ali Serhan Tarkan , Cüneyt Kaya","doi":"10.1016/j.rsma.2026.104772","DOIUrl":"10.1016/j.rsma.2026.104772","url":null,"abstract":"<div><div>In the Mediterranean, Salema <em>Sarpa salpa</em> is among the most economically important coastal fishes. Yet a major gap in its region-specific, and sex-disaggregated data on biology and growth constraining both precise stock assessments and long ecosystem-based fisheries management strategies in the eastern Mediterranean. To address this data deficiency, this study presents an integrative analysis of the species' biological traits, growth parameters, and population structure in İzmir Bay (eastern Aegean Sea, western Türkiye), using a full annual sampling of 319 individuals. Caught individuals comprised 105 males, 82 females, and 132 hermaphrodites. Total length ranged from 16.7 to 38.0 cm, with the most frequent class lengths being 24.1–27.0 cm (29 %) and 27.1–30.0 cm (25 %). The species exhibited isometric growth (b ≈ 3), indicating that weight increases proportionally with length, while gonadosomatic index trends revealed that spawning occurs mainly in autumn. Among the three tested growth models (von Bertalanffy, Gompertz, Logistic), the von Bertalanffy model provided the best fit for the overall population (L∞ ≈ 46.6 cm, K ≈ 0.08), the Gompertz model for males (L∞ ≈ 35.9 cm, K ≈ 0.20), and the von Bertalanffy again for females and hermaphrodites (L∞ ≈ 38–43 cm). These findings indicate proportional length–weight growth and an autumn spawning period. Analysis of otoliths indicated that age-length relationships followed smooth growth patterns, with female size exceeding males in later age classes. Collected data on <em>Sarpa salpa</em> in İzmir Bay provides valuable baseline data for this species’ regional biology; knowledge crucial to fishery management, stock assessment, and ecological monitoring that may serve as a foundation for sustainable conservation of the Aegean Sea.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"94 ","pages":"Article 104772"},"PeriodicalIF":2.4,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145980966","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}
Synthetic aperture radar (SAR) has emerged as a vital technology for detecting oil spills, even in challenging weather conditions. Deep learning models have demonstrated significant potential in leveraging SAR images for oil spill detection, owing to their robust feature extraction capabilities. However, considering the diversity of oil spill target scales and the extraction of global and local information, there are still particular challenges in accurately extracting oil spill areas from SAR images. Additionally, polarimetric information can significantly enhance the separability of oil films and seawater. To overcome these challenges, a Multi-scale Alignment and Fusion U-Shape Transformer Network (MAF-UFormer) is proposed, which enhances feature representation by integrating multi-scale fusion and agent attention mechanisms. To evaluate the effectiveness of MAF-UFormer, we perform experiments on the publicly available Deep-SAR Oil Spill Detection (SOS) dataset. The results demonstrate that MAF-UFormer achieves F1-Scores of 87.51 % and 83.03 % on the Sentinel-1 and PALSAR subsets of SOS, respectively. To further validate the robustness of MAF-UFormer, we create a new dataset, the Sentinel-1 Oil Spill Detection Dataset Part 1 (S1OSD-1). Experiments on S1OSD-1 demonstrate MAF-UFormer’s superior accuracy in oil spill detection, outperforming existing methods. Given SAR’s capability to extract polarimetric features that aid in distinguishing oil spills from seawater, we enhance S1OSD-1 by incorporating polarimetric data to construct Part 2 (S1OSD-2). On S1OSD-2, MAF-UFormer achieves an additional 1.68 % improvement in F1-Score over S1OSD-1. These results highlight the potential of MAF-UFormer for oil spill detection, offering vital technical support for oil spill emergency response and marine environmental protection.
{"title":"MAF-UFormer: Oil spill detection in SAR images using multi-scale alignment and fusion U-shaped transformer network","authors":"Caiyi Sun, Dawei Wang, Mingming Xu, Shiqing Wei, Shanwei Liu, Zhongwei Li","doi":"10.1016/j.rsma.2026.104773","DOIUrl":"10.1016/j.rsma.2026.104773","url":null,"abstract":"<div><div>Synthetic aperture radar (SAR) has emerged as a vital technology for detecting oil spills, even in challenging weather conditions. Deep learning models have demonstrated significant potential in leveraging SAR images for oil spill detection, owing to their robust feature extraction capabilities. However, considering the diversity of oil spill target scales and the extraction of global and local information, there are still particular challenges in accurately extracting oil spill areas from SAR images. Additionally, polarimetric information can significantly enhance the separability of oil films and seawater. To overcome these challenges, a Multi-scale Alignment and Fusion U-Shape Transformer Network (MAF-UFormer) is proposed, which enhances feature representation by integrating multi-scale fusion and agent attention mechanisms. To evaluate the effectiveness of MAF-UFormer, we perform experiments on the publicly available Deep-SAR Oil Spill Detection (SOS) dataset. The results demonstrate that MAF-UFormer achieves F1-Scores of 87.51 % and 83.03 % on the Sentinel-1 and PALSAR subsets of SOS, respectively. To further validate the robustness of MAF-UFormer, we create a new dataset, the Sentinel-1 Oil Spill Detection Dataset Part 1 (S1OSD-1). Experiments on S1OSD-1 demonstrate MAF-UFormer’s superior accuracy in oil spill detection, outperforming existing methods. Given SAR’s capability to extract polarimetric features that aid in distinguishing oil spills from seawater, we enhance S1OSD-1 by incorporating polarimetric data to construct Part 2 (S1OSD-2). On S1OSD-2, MAF-UFormer achieves an additional 1.68 % improvement in F1-Score over S1OSD-1. These results highlight the potential of MAF-UFormer for oil spill detection, offering vital technical support for oil spill emergency response and marine environmental protection.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"94 ","pages":"Article 104773"},"PeriodicalIF":2.4,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145980840","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 : 2026-02-01Epub Date: 2026-01-14DOI: 10.1016/j.rsma.2026.104779
Funda Üstün , Orçin Uygun , Levent Bat , Murat Dağtekin
This study examined the zooplankton composition, abundance, and biomass distribution, as well as their relationship with environmental variables at 17 stations between Sinop (Türkeli) and Samsun (Yakakent) in the Turkish Black Sea in June 2023. The mean zooplankton abundance and biomass were 705.85 ± 556.02 individuals (ind.)/m3 and 39.53 ± 37.33 mg/m3, respectively. The copepods were the most dominant taxa in terms of abundance and biomass, followed by Noctiluca scintillans. Coastal shallow stations were mainly characterised by higher abundances of Paracalanus parvus and Acartia clausi, whereas offshore deeper stations were associated with Pseudocalanus elongatus, Oithona similis and Parasagitta setosa. Zooplankton abundance and biomass exhibited marked spatial variability along the transect. The abundances of Pleopis polyphemoides and meroplankton groups were affected by temperature and salinity changes. These findings indicate that the zooplankton community structure exhibits spatial variation and is sensitive to environmental variables.
{"title":"Spatial patterns of zooplankton communities along the Sinop-Samsun transect","authors":"Funda Üstün , Orçin Uygun , Levent Bat , Murat Dağtekin","doi":"10.1016/j.rsma.2026.104779","DOIUrl":"10.1016/j.rsma.2026.104779","url":null,"abstract":"<div><div>This study examined the zooplankton composition, abundance, and biomass distribution, as well as their relationship with environmental variables at 17 stations between Sinop (Türkeli) and Samsun (Yakakent) in the Turkish Black Sea in June 2023. The mean zooplankton abundance and biomass were 705.85 ± 556.02 individuals (ind.)/m<sup>3</sup> and 39.53 ± 37.33 mg/m<sup>3</sup>, respectively. The copepods were the most dominant taxa in terms of abundance and biomass, followed by <em>Noctiluca scintillans</em>. Coastal shallow stations were mainly characterised by higher abundances of <em>Paracalanus parvus</em> and <em>Acartia clausi</em>, whereas offshore deeper stations were associated with <em>Pseudocalanus elongatus</em>, <em>Oithona similis</em> and <em>Parasagitta setosa</em>. Zooplankton abundance and biomass exhibited marked spatial variability along the transect. The abundances of <em>Pleopis polyphemoides</em> and meroplankton groups were affected by temperature and salinity changes. These findings indicate that the zooplankton community structure exhibits spatial variation and is sensitive to environmental variables.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"94 ","pages":"Article 104779"},"PeriodicalIF":2.4,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145981063","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 blue crab, Callinectes sapidus, is an invasive species in the Mediterranean Sea. The species caused significant ecological and economic damage and up to now in the Mediterranean it has been used only to a limited extent as a commercial resource. The present study aimed to provide conversion factors for the accurate reconstruction of weights in mutilated individuals using carapace width (CW), and to examine the biology of the blue crab in the Venetian Lagoon. A total of 570 blue crabs were sampled in 2024. Employing the conversion formula for estimating CW, data were recovered for those that exhibited mutilation of the lateral spines of the carapace. Approximately 66 % of blue crabs showed mutilation of the claws. By applying a weight conversion formula, a new body weight was estimated. This allowed the inclusion of mutilated individuals in the calculation of both the L50 (the CW at which 50 % of individuals are sexually mature) and the wet weight-CW relationship (WW-CW). Sex specific L50 values were calculated: 106.5 mm for males and 116.8 mm of CW for females. The WW-CW analysis enabled the estimation of sex-specific growth patterns, which were found to be higher in males than in females. These results provide crucial insights into population dynamics, as well as biometry and reproductive strategies of this species. These findings are essential for developing effective management and monitoring of the blue crab populations in non-native habitats.
{"title":"Measuring invaders: Innovative techniques for blue crab (Callinectes sapidus) biometric measurements","authors":"Lorenzo Zacchetti , Leonardo Marconi , Federico Calì , Filippo Domenichetti , Enrico Cecapolli , Michela Martinelli","doi":"10.1016/j.rsma.2026.104763","DOIUrl":"10.1016/j.rsma.2026.104763","url":null,"abstract":"<div><div>The blue crab, <em>Callinectes sapidus</em>, is an invasive species in the Mediterranean Sea. The species caused significant ecological and economic damage and up to now in the Mediterranean it has been used only to a limited extent as a commercial resource. The present study aimed to provide conversion factors for the accurate reconstruction of weights in mutilated individuals using carapace width (CW), and to examine the biology of the blue crab in the Venetian Lagoon. A total of 570 blue crabs were sampled in 2024. Employing the conversion formula for estimating CW, data were recovered for those that exhibited mutilation of the lateral spines of the carapace. Approximately 66 % of blue crabs showed mutilation of the claws. By applying a weight conversion formula, a new body weight was estimated. This allowed the inclusion of mutilated individuals in the calculation of both the L50 (the CW at which 50 % of individuals are sexually mature) and the wet weight-CW relationship (WW-CW). Sex specific L50 values were calculated: 106.5 mm for males and 116.8 mm of CW for females. The WW-CW analysis enabled the estimation of sex-specific growth patterns, which were found to be higher in males than in females. These results provide crucial insights into population dynamics, as well as biometry and reproductive strategies of this species. These findings are essential for developing effective management and monitoring of the blue crab populations in non-native habitats.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"94 ","pages":"Article 104763"},"PeriodicalIF":2.4,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145980841","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}
In this study, sediments from 12 locations along Chennai, Tamil Nadu, India's southeast coast were examined for the distribution and concentration of naturally occurring radionuclides (238 U, 232Th, and 40K). For 238U, activity concentrations were below detection limits (BDL) to 940 ± 8 Bq/kg, for 232Th, BDL to 4978 ± 16 Bq/kg, and for 40K, between 490 ± 22 and 6669 ± 30 Bq/kg. The highest activity levels of any radionuclide were seen in Nemmeli (S7). The average eTh/eU ratio was 3.89, indicating a high thorium-to-uranium ratio, with Nemmeli (S7) showing the most pronounced value (eTh/eU > 7). The value suggests the depletion of uranium, potentially due to leaching. Assessment of radiological risk parameters revealed a range of absorbed dose rates from 24.2 to 3721.1 nGy/h, annual effective dose equivalents from 0.03 to 4.6 mSv/y, external hazard indices from 0.1 to 23.1, internal hazard indices from 0.1 to 25.7, excess lifetime cancer risk (ELCR) from 0.1 to 15.97, and annual gonadal dose equivalents from 153.86 to 25806.71 µSv/y. The ELCR values exceeded the world average, indicating elevated radiogenic risks to human health in these coastal regions. Notably, Nemmeli (S7) exhibited the highest radiological risk, with values 86 times greater than the global average of 300 µSv/y, highlighting an alarmingly elevated radiological risk associated with radionuclide concentrations at this site.
{"title":"Radiological risk assessment of primordial radionuclides in sediment: A case study of southeast Chennai, Tamil Nadu, India","authors":"Marckasagayam Priyadharshini , Munawar Suhail Ahmed , A. Chandrasekaran , Bharathi Santhanabharathi , Kumara Perumal Pradhoshini , Aarthi Murugavel , Van-Hao Duong , Ismail Rahman , Mohamed Saiyad Musthafa","doi":"10.1016/j.rsma.2025.104731","DOIUrl":"10.1016/j.rsma.2025.104731","url":null,"abstract":"<div><div>In this study, sediments from 12 locations along Chennai, Tamil Nadu, India's southeast coast were examined for the distribution and concentration of naturally occurring radionuclides (<sup>238</sup> U, <sup>232</sup>Th, and <sup>40</sup>K). For <sup>238</sup>U, activity concentrations were below detection limits (BDL) to 940 ± 8 Bq/kg, for <sup>232</sup>Th, BDL to 4978 ± 16 Bq/kg, and for <sup>40</sup>K, between 490 ± 22 and 6669 ± 30 Bq/kg. The highest activity levels of any radionuclide were seen in Nemmeli (S7). The average eTh/eU ratio was 3.89, indicating a high thorium-to-uranium ratio, with Nemmeli (S7) showing the most pronounced value (eTh/eU > 7). The value suggests the depletion of uranium, potentially due to leaching. Assessment of radiological risk parameters revealed a range of absorbed dose rates from 24.2 to 3721.1 nGy/h, annual effective dose equivalents from 0.03 to 4.6 mSv/y, external hazard indices from 0.1 to 23.1, internal hazard indices from 0.1 to 25.7, excess lifetime cancer risk (ELCR) from 0.1 to 15.97, and annual gonadal dose equivalents from 153.86 to 25806.71 µSv/y. The ELCR values exceeded the world average, indicating elevated radiogenic risks to human health in these coastal regions. Notably, Nemmeli (S7) exhibited the highest radiological risk, with values 86 times greater than the global average of 300 µSv/y, highlighting an alarmingly elevated radiological risk associated with radionuclide concentrations at this site.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"94 ","pages":"Article 104731"},"PeriodicalIF":2.4,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145980970","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 : 2026-02-01Epub Date: 2026-01-07DOI: 10.1016/j.rsma.2026.104759
Md. Simul Bhuyan , Mohammad Ismail , A.J.M. Morshed , Md. Tariqul Islam , Vinmoy Mondal
Heavy metals (HMs) can accumulate in benthic organisms such as mudskippers, which inhabit coastal sediments, posing both ecological risks and direct threats to human health through their consumption. This study assessed HM contamination, ecological and human health risks in sediments from nine mudskipper habitats along Cox’s Bazar coast, Bangladesh. Sediments were dominated by Fe, Mn, Ni, and Zn, with lower levels of Cu, Pb, Cd, Cr, and Co. Keary Ghat and Bodir Jetty were relatively high-risk sites, though spatial differences among sites were not statistically significant (ANOVA, p > 0.05). Strong positive correlations among metals (p < 0.05) suggested common sources, and hierarchical clustering grouped sites into two major clusters based on similar HM profiles. The APCS-MLR results indicate that agriculture and aquaculture represent the largest relative contributors to sediment-associated metals in the study area; however, port activities, marine traffic, small-scale industries, and wastewater inputs also contribute, particularly at near-shore and jetty-adjacent sites. Igeo classified most metals as “practically uncontaminated,” except Cd, which exhibited moderate contamination at specific sites (Bodir Jetty and Keary Ghat), supported by EF analysis. Pollution load index remained below 1, indicating low overall contamination, and the potential ecological risk index suggested a “low ecological risk,” with Cd as the main contributor. Deterministic human health risk assessment (HHRA) indicated higher non-carcinogenic risk for children via Cr and Cd ingestion, though hazard indices were below 1 for both adults and children. Carcinogenic risk was generally acceptable, except for Cr in children. Probabilistic Monte Carlo simulations corroborated HHRA findings, highlighting Keary Ghat as a site with elevated health risk. Overall, sediments exhibit mild HM contamination, requiring ongoing monitoring of Cr and Cd for sustainable environmental management.
{"title":"Heavy metal contamination in sediment of mudskipper habitat along the Cox’s Bazar coast, Bay of Bengal, Bangladesh: Ecological and human health risk assessment using deterministic and probabilistic approaches","authors":"Md. Simul Bhuyan , Mohammad Ismail , A.J.M. Morshed , Md. Tariqul Islam , Vinmoy Mondal","doi":"10.1016/j.rsma.2026.104759","DOIUrl":"10.1016/j.rsma.2026.104759","url":null,"abstract":"<div><div>Heavy metals (HMs) can accumulate in benthic organisms such as mudskippers, which inhabit coastal sediments, posing both ecological risks and direct threats to human health through their consumption. This study assessed HM contamination, ecological and human health risks in sediments from nine mudskipper habitats along Cox’s Bazar coast, Bangladesh. Sediments were dominated by Fe, Mn, Ni, and Zn, with lower levels of Cu, Pb, Cd, Cr, and Co. Keary Ghat and Bodir Jetty were relatively high-risk sites, though spatial differences among sites were not statistically significant (ANOVA, p > 0.05). Strong positive correlations among metals (p < 0.05) suggested common sources, and hierarchical clustering grouped sites into two major clusters based on similar HM profiles. The APCS-MLR results indicate that agriculture and aquaculture represent the largest relative contributors to sediment-associated metals in the study area; however, port activities, marine traffic, small-scale industries, and wastewater inputs also contribute, particularly at near-shore and jetty-adjacent sites. Igeo classified most metals as “practically uncontaminated,” except Cd, which exhibited moderate contamination at specific sites (Bodir Jetty and Keary Ghat), supported by EF analysis. Pollution load index remained below 1, indicating low overall contamination, and the potential ecological risk index suggested a “low ecological risk,” with Cd as the main contributor. Deterministic human health risk assessment (HHRA) indicated higher non-carcinogenic risk for children via Cr and Cd ingestion, though hazard indices were below 1 for both adults and children. Carcinogenic risk was generally acceptable, except for Cr in children. Probabilistic Monte Carlo simulations corroborated HHRA findings, highlighting Keary Ghat as a site with elevated health risk. Overall, sediments exhibit mild HM contamination, requiring ongoing monitoring of Cr and Cd for sustainable environmental management.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"94 ","pages":"Article 104759"},"PeriodicalIF":2.4,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145980969","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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