Pub Date : 2025-03-14DOI: 10.1016/j.marpolbul.2025.117821
Mariana V. Carvalho , Rafaella Monteiro , Iara da C. Souza , Julieta Griboff , Fabiano Bendhack , Magdalena V. Monferrán , Daniel A. Wunderlin , Marisa N. Fernandes
The concentration of metals/metalloids in settleable particulate matter (SePM) from industrial area and in the muscles were determined in the estuarine fish, Centropomus parallelus, after 96 h-exposure to different SePM concentrations. Antioxidant defenses, oxidative damage and neurotoxicity were also determined. The risk for human consumption was evaluated by estimating daily intake (EDI), target hazard quotient (THQ), and hazard index (HI) and compared with fish collected close to the industries. Eighteen metals/metalloids were quantified in SePM and the muscles. In red muscle, the antioxidant enzymes were unchanged, and the acetylcholinesterase (AChE) activity and protein carbonyls (PC) increased. In white muscle, the glutathione-S-transferase (GST) activity and glutathione content (GSH) decreased, PC levels and lipid peroxidation (LPO) increased; the AChE was unchanged. Metals/metalloids bioaccumulated in muscles induced oxidative damage which may affect muscle function and consequently, fish performance. After short-term exposure to SePM there was no risk for human consumption. However, the EDI of fish collected in field exceeded the acceptable DI for children concerning to As and Hg. HI were lower than 1 revealing no carcinogenic risk.
{"title":"Muscle oxidative stress, neurotoxicity and human health risks from consuming fish exposed to metallic settleable atmospheric particulate matter","authors":"Mariana V. Carvalho , Rafaella Monteiro , Iara da C. Souza , Julieta Griboff , Fabiano Bendhack , Magdalena V. Monferrán , Daniel A. Wunderlin , Marisa N. Fernandes","doi":"10.1016/j.marpolbul.2025.117821","DOIUrl":"10.1016/j.marpolbul.2025.117821","url":null,"abstract":"<div><div>The concentration of metals/metalloids in settleable particulate matter (SePM) from industrial area and in the muscles were determined in the estuarine fish, <em>Centropomus parallelus</em>, after 96 h-exposure to different SePM concentrations. Antioxidant defenses, oxidative damage and neurotoxicity were also determined. The risk for human consumption was evaluated by estimating daily intake (EDI), target hazard quotient (THQ), and hazard index (HI) and compared with fish collected close to the industries. Eighteen metals/metalloids were quantified in SePM and the muscles. In red muscle, the antioxidant enzymes were unchanged, and the acetylcholinesterase (AChE) activity and protein carbonyls (PC) increased. In white muscle, the glutathione-S-transferase (GST) activity and glutathione content (GSH) decreased, PC levels and lipid peroxidation (LPO) increased; the AChE was unchanged. Metals/metalloids bioaccumulated in muscles induced oxidative damage which may affect muscle function and consequently, fish performance. After short-term exposure to SePM there was no risk for human consumption. However, the EDI of fish collected in field exceeded the acceptable DI for children concerning to As and Hg. HI were lower than 1 revealing no carcinogenic risk.</div></div>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"214 ","pages":"Article 117821"},"PeriodicalIF":5.3,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-03-14DOI: 10.1016/j.marpolbul.2025.117826
Alejandro Bernal-Ibáñez , Marta Castilla-Gavilán , Esperanza G. Sumariva , Ismael Hachero-Cruzado
The current spread and proliferation of the invasive macroalga Rugulopteryx okamurae in South European coastal waters is a major ecological problem with a high socioeconomic impact. First identified as invasive in the Strait of Gibraltar (S Iberian Peninsula) in 2014, R. okamurae continues its expansion along the Atlantic and Mediterranean coasts. Despite its extended presence, the biotic control mechanisms and long-term impacts of R. okamurae consumption by native herbivores remain unexamined. This 24-week experiment investigates the physiological responses of the common sea urchin Paracentrotus lividus from three different locations following an invasion gradient by the time when R. okamurae was first detected. Sea urchin individuals were fed two diets: a strict diet of 100 % R. okamurae or a mixed diet with 50 % R. okamurae and 50 % Ulva sp. We evaluated the response of P. lividus individuals based on ingestion rates, relative weight (g), mortality, Ivlev's electivity index, and gonadosomatic index (GSI). Individuals from locations with more time since invasion fed on 100 % R. okamurae showed higher weight loss, higher mortality, and lower GSI than individuals from short-term invaded locations. Those negative effects were reduced for individuals fed a mixed diet. Within the mixed diet, Ivlev's electivity values of individuals from “10 years of invasion” reduced from random selection to partial avoidance over R. okamurae across the experiment. Our results reveal long-term underlying effects of R. okamurae ingestion, suggesting implications for the conservation of P. lividus populations in invaded locations, with potential ecosystem-level consequences as it is a key controlling species in coastal systems.
{"title":"Invasion context matters: Vulnerability of the sea urchin Paracentrotus lividus to ingestion of Rugulopteryx okamurae increases with invasion time","authors":"Alejandro Bernal-Ibáñez , Marta Castilla-Gavilán , Esperanza G. Sumariva , Ismael Hachero-Cruzado","doi":"10.1016/j.marpolbul.2025.117826","DOIUrl":"10.1016/j.marpolbul.2025.117826","url":null,"abstract":"<div><div>The current spread and proliferation of the invasive macroalga <em>Rugulopteryx okamurae</em> in South European coastal waters is a major ecological problem with a high socioeconomic impact. First identified as invasive in the Strait of Gibraltar (S Iberian Peninsula) in 2014, <em>R. okamurae</em> continues its expansion along the Atlantic and Mediterranean coasts. Despite its extended presence, the biotic control mechanisms and long-term impacts of <em>R. okamurae</em> consumption by native herbivores remain unexamined. This 24-week experiment investigates the physiological responses of the common sea urchin <em>Paracentrotus lividus</em> from three different locations following an invasion gradient by the time when <em>R. okamurae</em> was first detected. Sea urchin individuals were fed two diets: a strict diet of 100 % <em>R. okamurae</em> or a mixed diet with 50 % <em>R. okamurae</em> and 50 % <em>Ulva</em> sp. We evaluated the response of <em>P. lividus</em> individuals based on ingestion rates, relative weight (g), mortality, Ivlev's electivity index, and gonadosomatic index (GSI). Individuals from locations with more time since invasion fed on 100 % <em>R. okamurae</em> showed higher weight loss, higher mortality, and lower GSI than individuals from short-term invaded locations. Those negative effects were reduced for individuals fed a mixed diet. Within the mixed diet, Ivlev's electivity values of individuals from “10 years of invasion” reduced from random selection to partial avoidance over <em>R. okamurae</em> across the experiment. Our results reveal long-term underlying effects of <em>R. okamurae</em> ingestion, suggesting implications for the conservation of <em>P. lividus</em> populations in invaded locations, with potential ecosystem-level consequences as it is a key controlling species in coastal systems.</div></div>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"214 ","pages":"Article 117826"},"PeriodicalIF":5.3,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-03-14DOI: 10.1016/j.marpolbul.2025.117803
M. Cerdà-Domènech , J. Frigola , M. Canals , A. Sanchez-Vidal , A. Baza-Varas , M. Tarrés , M. Van Daele , M.N. Boone , D. Amblas , J. Garcia-Orellana
Coastal disposal of mine wastes has been recognized as a critical source of metals and metalloids to the water column and seabed sediments, leading to ecotoxicological impacts and benthic habitat loss. Portmán Bay, SE Spain, is one of the most severe cases of coastal impacts due to mine waste dumping. From 1957 to 1990, 57 million tons of metal (Fe, Mn, Zn and Pb) and metalloid–rich (As) artificial soils were discharged into the shoreline, completely filling the bay and extending it seaward. Decades after mining ceased, concerns remain about the stability of the submarine deposit and potential remobilization that could be induced by a potential coastline restoration project or other natural processes.
This study aims to provide a complete physical and geochemical characterization of the uppermost layers of the mine tailings deposit and the pre and post–dumping marine sediment off Portmán Bay, focusing on the dispersal patterns and pollution levels of metal(loid)s throughout the inner continental shelf. Post-dumping sediment metal(loid) concentrations are lower than those in the tailings but still significantly higher than pre-dumping levels. Enrichment factors in the seafloor sediments (post-dumping) have been identified for Pb (5 times higher than background natural values), Mn (8×), As (9×), Zn (22×) and Fe (56×). Additionally, 8.6 km2 of the seabed could be considered hazardous based on the Action Level B threshold of the Sediment Quality Guidelines for Zn, As and Pb. These findings indicate ongoing metal(loid) flux into shelf sediments, providing insights for the environmental restoration of Portmán Bay and its seafloor.
{"title":"Persistent metal and metalloid fluxes to the seafloor from an underlying mine tailings deposit 25 years after disposal off Portmán Bay (SE Spain)","authors":"M. Cerdà-Domènech , J. Frigola , M. Canals , A. Sanchez-Vidal , A. Baza-Varas , M. Tarrés , M. Van Daele , M.N. Boone , D. Amblas , J. Garcia-Orellana","doi":"10.1016/j.marpolbul.2025.117803","DOIUrl":"10.1016/j.marpolbul.2025.117803","url":null,"abstract":"<div><div>Coastal disposal of mine wastes has been recognized as a critical source of metals and metalloids to the water column and seabed sediments, leading to ecotoxicological impacts and benthic habitat loss. Portmán Bay, SE Spain, is one of the most severe cases of coastal impacts due to mine waste dumping. From 1957 to 1990, 57 million tons of metal (Fe, Mn, Zn and Pb) and metalloid–rich (As) artificial soils were discharged into the shoreline, completely filling the bay and extending it seaward. Decades after mining ceased, concerns remain about the stability of the submarine deposit and potential remobilization that could be induced by a potential coastline restoration project or other natural processes.</div><div>This study aims to provide a complete physical and geochemical characterization of the uppermost layers of the mine tailings deposit and the pre and post–dumping marine sediment off Portmán Bay, focusing on the dispersal patterns and pollution levels of metal(loid)s throughout the inner continental shelf. Post-dumping sediment metal(loid) concentrations are lower than those in the tailings but still significantly higher than pre-dumping levels. Enrichment factors in the seafloor sediments (post-dumping) have been identified for Pb (5 times higher than background natural values), Mn (8×), As (9×), Zn (22×) and Fe (56×). Additionally, 8.6 km<sup>2</sup> of the seabed could be considered hazardous based on the Action Level B threshold of the Sediment Quality Guidelines for Zn, As and Pb. These findings indicate ongoing metal(loid) flux into shelf sediments, providing insights for the environmental restoration of Portmán Bay and its seafloor.</div></div>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"214 ","pages":"Article 117803"},"PeriodicalIF":5.3,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-03-14DOI: 10.1016/j.marpolbul.2025.117810
Anna Ebeling , Dominik Wippermann , Tristan Zimmermann , Ole Klein , Torben Kirchgeorg , Ingo Weinberg , Anna Plass , Simone Hasenbein , Daniel Pröfrock
During the last decade offshore wind energy production has become an important source of renewable energy. To ensure safe operation during the lifetime of an offshore wind turbine, the steel structures need to be protected against corrosion. This work evaluates potential metal emissions and environmental impacts from galvanic anodes used for corrosion protection of offshore wind farms (OWFs) by applying a novel multi-tracer approach. A total of 235 surface water samples from different German North Sea OWFs were taken between 2016 and 2022 and analyzed for their concentration of 32 metals via online preconcentration/matrix removal ICP-MS/MS. The concentrations were assessed for temporal and spatial trends with an emphasis on the previously proposed OWF tracers Al, Cd, Pb, Zn, Ga and In. By comparing patterns of In concentrations and Gd anomalies together with modelled drift trajectories of water masses, a differentiation of riverine and OWF-induced metal load was achieved.
Results suggest that elevated In concentrations may be linked to OWF corrosion protection systems. Other metal concentrations remained within natural variability. This study demonstrates that the applied tracer approach is effective in identifying OWF-induced metal emissions. Furthermore, it highlights the necessity for long-term monitoring of these tracers to further investigate this emerging source of contamination.
{"title":"Coupling metal concentrations and drift simulations for tracing emissions from offshore wind farms","authors":"Anna Ebeling , Dominik Wippermann , Tristan Zimmermann , Ole Klein , Torben Kirchgeorg , Ingo Weinberg , Anna Plass , Simone Hasenbein , Daniel Pröfrock","doi":"10.1016/j.marpolbul.2025.117810","DOIUrl":"10.1016/j.marpolbul.2025.117810","url":null,"abstract":"<div><div>During the last decade offshore wind energy production has become an important source of renewable energy. To ensure safe operation during the lifetime of an offshore wind turbine, the steel structures need to be protected against corrosion. This work evaluates potential metal emissions and environmental impacts from galvanic anodes used for corrosion protection of offshore wind farms (OWFs) by applying a novel multi-tracer approach. A total of 235 surface water samples from different German North Sea OWFs were taken between 2016 and 2022 and analyzed for their concentration of 32 metals via online preconcentration/matrix removal ICP-MS/MS. The concentrations were assessed for temporal and spatial trends with an emphasis on the previously proposed OWF tracers Al, Cd, Pb, Zn, Ga and In. By comparing patterns of In concentrations and Gd anomalies together with modelled drift trajectories of water masses, a differentiation of riverine and OWF-induced metal load was achieved.</div><div>Results suggest that elevated In concentrations may be linked to OWF corrosion protection systems. Other metal concentrations remained within natural variability. This study demonstrates that the applied tracer approach is effective in identifying OWF-induced metal emissions. Furthermore, it highlights the necessity for long-term monitoring of these tracers to further investigate this emerging source of contamination.</div></div>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"214 ","pages":"Article 117810"},"PeriodicalIF":5.3,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-14DOI: 10.1016/j.marpolbul.2025.117817
Gerardo I. Zardi , Kevin C.K. Ma , Pierre William Froneman , Katy R. Nicastro
As plastic pollution has accumulated in the natural environment over the last half-century, so too has the body of literature on plastic contamination assessment. Despite this growing research, new, and cryptic forms of plastic debris continue to emerge, with limited data on their composition and abundance. Among these novel pollutants is a type of marine litter derived from the burning or melting of manufactured plastics. In this study, we report for the first time the presence of burned plastic forms at selected intertidal sandy habitats along the South African coast. We examined both pyroplastics—molten items with rock-like properties due to environmental weathering—and partially burned plastics, which retain features of the original manufactured objects. Surveys conducted across 22 sites spanning over 2000 km revealed this new type of litter at 19 locations, predominantly composed of polyethylene (37 items), polyethylene terephthalate (12 items), polypropylene (5 items) and polystyrene (3 items), with an average weight of 5.4 g per item. These findings highlight the widespread presence of burned plastics in coastal environments in South Africa and emphasize the need for further research into their ecological impacts.
{"title":"First record of pyroplastic and partially burnt plastic litter along South African shores","authors":"Gerardo I. Zardi , Kevin C.K. Ma , Pierre William Froneman , Katy R. Nicastro","doi":"10.1016/j.marpolbul.2025.117817","DOIUrl":"10.1016/j.marpolbul.2025.117817","url":null,"abstract":"<div><div>As plastic pollution has accumulated in the natural environment over the last half-century, so too has the body of literature on plastic contamination assessment. Despite this growing research, new, and cryptic forms of plastic debris continue to emerge, with limited data on their composition and abundance. Among these novel pollutants is a type of marine litter derived from the burning or melting of manufactured plastics. In this study, we report for the first time the presence of burned plastic forms at selected intertidal sandy habitats along the South African coast. We examined both pyroplastics—molten items with rock-like properties due to environmental weathering—and partially burned plastics, which retain features of the original manufactured objects. Surveys conducted across 22 sites spanning over 2000 km revealed this new type of litter at 19 locations, predominantly composed of polyethylene (37 items), polyethylene terephthalate (12 items), polypropylene (5 items) and polystyrene (3 items), with an average weight of 5.4 g per item. These findings highlight the widespread presence of burned plastics in coastal environments in South Africa and emphasize the need for further research into their ecological impacts.</div></div>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"214 ","pages":"Article 117817"},"PeriodicalIF":5.3,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-14DOI: 10.1016/j.marpolbul.2025.117808
Neha P. Patel , Atanu Panja , Vasavdutta D. Sonpal , Maheshawari J. Behere , Manisha K. Parmar , Krunal C. Joshi , Soumya Haldar
Antibiotic resistance (ABR) is a significant global challenge, with antibiotics from various sources ending up in the ocean and affecting marine life. Profiling ABR in deep-sea bacteria is crucial for understanding the spread of ABR from environmental microbes to clinical pathogen and vice-versa. We evaluated facultative psychro-piezophile deep-sea bacteria from different depths of the Arabian Sea for their resistance to 20 commercial antibiotics. Bacteria from Zone 5 (2000–3000 m) exhibited the highest multiple antibiotic resistance (MAR) index (0.90), identifying it as a significant reservoir of ABR. Zone 1 (5–100 m) isolates (average 20 %) showed the highest resistance to synthetic antibiotics. Zone 3 (500–1000 m) isolates were highly resistant to diverse classes of antibiotics, separating upper (zone 1 and 2 (100-500 m) and deeper sea zones (zone 4 (1000–2000 m) and 5). The identified isolates belong to Bacillus, Niallia, Escherichia, Cytobacillus, and Pseudomonas genera. Additionally, antibiotic resistance genes (ARGs) such as StrB (2 isolates) and SXT integrase (1 isolate) were detected only in Zone 5 isolates. The SulII gene (19 isolates) was present across all zones. PCA analysis revealed a negative correlation between resistance and physicochemical factors (macronutrients like phosphate (PO43−), nitrate (NO3−), nitrite (NO2−), and ammonia (NH3); micronutrient and heavy metals like (iron (Fe), manganese (Mn), zinc (Zn), copper (Cu), nickel (Ni)), aluminium (Al), cadmium (Cd), and chromium (Cr)), except for Phosphate (0.65). Overall, this study is the first to provide valuable insights into the prevalence of ABR using culture-dependent methods and its correlation with physicochemical factors in the deep-sea environments of the Arabian Sea.
{"title":"Antibiotic resistance profile of facultative deep-sea psychro-piezophile bacteria from the Arabian Sea and their relation with physicochemical factors","authors":"Neha P. Patel , Atanu Panja , Vasavdutta D. Sonpal , Maheshawari J. Behere , Manisha K. Parmar , Krunal C. Joshi , Soumya Haldar","doi":"10.1016/j.marpolbul.2025.117808","DOIUrl":"10.1016/j.marpolbul.2025.117808","url":null,"abstract":"<div><div>Antibiotic resistance (ABR) is a significant global challenge, with antibiotics from various sources ending up in the ocean and affecting marine life. Profiling ABR in deep-sea bacteria is crucial for understanding the spread of ABR from environmental microbes to clinical pathogen and vice-versa. We evaluated facultative psychro-piezophile deep-sea bacteria from different depths of the Arabian Sea for their resistance to 20 commercial antibiotics. Bacteria from Zone 5 (2000–3000 m) exhibited the highest multiple antibiotic resistance (MAR) index (0.90), identifying it as a significant reservoir of ABR. Zone 1 (5–100 m) isolates (average 20 %) showed the highest resistance to synthetic antibiotics. Zone 3 (500–1000 m) isolates were highly resistant to diverse classes of antibiotics, separating upper (zone 1 and 2 (100-500 m) and deeper sea zones (zone 4 (1000–2000 m) and 5). The identified isolates belong to <em>Bacillus</em>, <em>Niallia</em>, <em>Escherichia</em>, <em>Cytobacillus</em>, and <em>Pseudomonas</em> genera. Additionally, antibiotic resistance genes (ARGs) such as StrB (2 isolates) and SXT integrase (1 isolate) were detected only in Zone 5 isolates. The SulII gene (19 isolates) was present across all zones. PCA analysis revealed a negative correlation between resistance and physicochemical factors (macronutrients like phosphate (PO<sub>4</sub><sup>3−</sup>), nitrate (NO<sub>3</sub><sup>−</sup>), nitrite (NO<sub>2</sub><sup>−</sup>), and ammonia (NH<sub>3</sub>); micronutrient and heavy metals like (iron (Fe), manganese (Mn), zinc (Zn), copper (Cu), nickel (Ni)), aluminium (Al), cadmium (Cd), and chromium (Cr)), except for Phosphate (0.65). Overall, this study is the first to provide valuable insights into the prevalence of ABR using culture-dependent methods and its correlation with physicochemical factors in the deep-sea environments of the Arabian Sea.</div></div>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"214 ","pages":"Article 117808"},"PeriodicalIF":5.3,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-03-14DOI: 10.1016/j.marpolbul.2025.117800
Jiao Wang , Xiaohan Liu , Xiuxia Mu , Hongjun Li , Baoquan Li , Yunlei Zhang
As climate change shifts marine ecosystems, understanding distribution changes of high trophic-level fish is critical for ecological and fisheries management. This study examined the distribution changes of five high trophic-level fish species in China's coastal waters from 1990 to 2023, using species distribution models (SDMs) combined in an ensemble modeling framework to predict future trends under RCP26 and RCP85 scenarios. The ensemble approach integrated multiple SDM algorithms to reduce uncertainty and improve predictive accuracy. The analysis incorporated ecological metrics like niche breadth, niche overlap, and species association indices to assess habitat suitability and interspecies interactions. The ensemble model performed well, particularly for monkfish (Lophius litulon) and whitespotted conger (Conger myriaster), both of which are demersal species. Key environmental factors influencing habitat distribution included bottom water temperature and depth. Under climate change scenarios, the spatial niche breadth of only the largehead hairtail (Trichiurus lepturus) was expected to increase, while the niche breadth of the other species was projected to decrease, especially under high emissions. Fish habitats were predicted to shrink under future climate scenarios, especially under high emissions, with significant losses projected by 2100, ranging from −47 % for the Slender lizardfish (Saurida elongata) to −24 % for the Monkfish, although habitat suitability was expected to improve in southern coastal areas and near the Korean Peninsula. This study emphasizes the profound effects of climate change on the distribution and ecological niches of high trophic-level fish, offering insights for future fisheries management and climate adaptation strategies.
{"title":"Ensemble predictions of high trophic-level fish distribution and species association in response to climate change in the coastal waters of China","authors":"Jiao Wang , Xiaohan Liu , Xiuxia Mu , Hongjun Li , Baoquan Li , Yunlei Zhang","doi":"10.1016/j.marpolbul.2025.117800","DOIUrl":"10.1016/j.marpolbul.2025.117800","url":null,"abstract":"<div><div>As climate change shifts marine ecosystems, understanding distribution changes of high trophic-level fish is critical for ecological and fisheries management. This study examined the distribution changes of five high trophic-level fish species in China's coastal waters from 1990 to 2023, using species distribution models (SDMs) combined in an ensemble modeling framework to predict future trends under RCP26 and RCP85 scenarios. The ensemble approach integrated multiple SDM algorithms to reduce uncertainty and improve predictive accuracy. The analysis incorporated ecological metrics like niche breadth, niche overlap, and species association indices to assess habitat suitability and interspecies interactions. The ensemble model performed well, particularly for monkfish (<em>Lophius litulon</em>) and whitespotted conger (<em>Conger myriaster</em>), both of which are demersal species. Key environmental factors influencing habitat distribution included bottom water temperature and depth. Under climate change scenarios, the spatial niche breadth of only the largehead hairtail (<em>Trichiurus lepturus</em>) was expected to increase, while the niche breadth of the other species was projected to decrease, especially under high emissions. Fish habitats were predicted to shrink under future climate scenarios, especially under high emissions, with significant losses projected by 2100, ranging from −47 % for the Slender lizardfish (<em>Saurida elongata</em>) to −24 % for the Monkfish, although habitat suitability was expected to improve in southern coastal areas and near the Korean Peninsula. This study emphasizes the profound effects of climate change on the distribution and ecological niches of high trophic-level fish, offering insights for future fisheries management and climate adaptation strategies.</div></div>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"214 ","pages":"Article 117800"},"PeriodicalIF":5.3,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-03-13DOI: 10.1016/j.marpolbul.2025.117806
Mehrshad Taheri , Maryam Yazdani Foshtomi , Ahmad Manbohi , Seyed Sahab Mira
In the present study, the spatial distribution of coastal free-living nematodes was first investigated at six different stations. The highest density, number of species, and Shannon diversity were recorded at Sisangan station. Subsequently, Sisangan station was chosen for studying the responses of the coastal free-living nematode community to increased surface water temperature (Field control = 20 °C, Treatment 1 = 24 °C, Treatment 2 = 27 °C, and Treatment 3 = 30 °C) experimentally over a period of 50 days. A total of thirteen species from eleven genera were identified. The genus Daptonema and the species Daptonema karabugasensis being the most dominant in all treatments. The highest total density and total Shannon index were recorded in the T3 treatment. There were no significant differences in the total number of species and the evenness index among the treatments. Changes in temperature significantly affected the community structure, primarily due to the presence or absence of specific species. SIMPER analysis showed that some species like Daptonema karabugasensis, Tripyloides marinus and Adoncholaimus araelensis were dominant within the community, although their relative abundance declined at the T2 and T3 treatments. In contrast, the relative abundance of Chromadorella parapoecilosoma and Chromadorita tenuis increased with rising temperatures in these treatments. The number of gravid females and juveniles also rose with temperature, peaking in the T3 treatment. As the temperature rose, the proportion of predators/omnivores (2B) in the community gradually increased, although the epistrate feeders (1B) remained dominant across all communities.
{"title":"Spatial distribution and effects of temperature rise on coastal free-living nematode community in the South Caspian Sea","authors":"Mehrshad Taheri , Maryam Yazdani Foshtomi , Ahmad Manbohi , Seyed Sahab Mira","doi":"10.1016/j.marpolbul.2025.117806","DOIUrl":"10.1016/j.marpolbul.2025.117806","url":null,"abstract":"<div><div>In the present study, the spatial distribution of coastal free-living nematodes was first investigated at six different stations. The highest density, number of species, and Shannon diversity were recorded at Sisangan station. Subsequently, Sisangan station was chosen for studying the responses of the coastal free-living nematode community to increased surface water temperature (Field control = 20 °C, Treatment 1 = 24 °C, Treatment 2 = 27 °C, and Treatment 3 = 30 °C) experimentally over a period of 50 days. A total of thirteen species from eleven genera were identified. The genus <em>Daptonema</em> and the species <em>Daptonema karabugasensis</em> being the most dominant in all treatments. The highest total density and total Shannon index were recorded in the T3 treatment. There were no significant differences in the total number of species and the evenness index among the treatments. Changes in temperature significantly affected the community structure, primarily due to the presence or absence of specific species. SIMPER analysis showed that some species like <em>Daptonema karabugasensis</em>, <em>Tripyloides marinus</em> and <em>Adoncholaimus araelensis</em> were dominant within the community, although their relative abundance declined at the T2 and T3 treatments. In contrast, the relative abundance of <em>Chromadorella parapoecilosoma</em> and <em>Chromadorita tenuis</em> increased with rising temperatures in these treatments. The number of gravid females and juveniles also rose with temperature, peaking in the T3 treatment. As the temperature rose, the proportion of predators/omnivores (2B) in the community gradually increased, although the epistrate feeders (1B) remained dominant across all communities.</div></div>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"214 ","pages":"Article 117806"},"PeriodicalIF":5.3,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143611043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-03-13DOI: 10.1016/j.marpolbul.2025.117816
Bonyad Ahmadi , Mehdi Gholamalifard , Seyed Mahmoud Ghasempouri , Tiit Kutser
It is time consuming and expensive to monitor extensive areas of coastal waters with sufficient frequency using in situ (ship based) methods. Satellite remote sensing is much more cost effective. Satellites can detect Optically Active Constituents (OACs) in water. Therefore, it is crucial to know the concentrations of OACs in the study area in order to develop and validate remote sensing methods suitable for assessing water quality in this region. The Pars Special Economic Energy Zone (PSEEZ), a major hub of natural gas extraction in the Persian Gulf, has undergone rapid industrial expansion since 1998, intensifying environmental pressures and necessitating high-resolution, frequent water quality assessments. However, a structured, long-term monitoring framework is absent despite the significance of this region. In order to develop satellite-based remote sensing methods for this region we carried out measurements of different OACs (chlorophyll-a, coloured dissolved organic matter (CDOM) and turbidity) and tested Landsat 8, Sentinel-2, and Sentinel-3 performance in retrieving the OACs. We tested the k-Nearest Neighbors machine learning algorithm. The selection of distance metrics demonstrated a significant influence on the accuracy of retrieving OACs. In turbidity retrieval, the Euclidean Distance (ED) enhanced the regression slope to 0.90 (a 55.17 % improvement over Fuzzy Mahalanobis Distance (FD)) and reduced the RMSLE to 0.51, corresponding to an approximate 160 % enhancement in precision. For CDOM, RMSLE values for ED and FD were 0.39 and 0.48, respectively, indicating an 18.75 % improvement favoring ED. Furthermore, bias analysis revealed deviations of 1–6 % compared to reference data, with the lowest values observed for Mahalanobis Distance (MD) with MSI and FD with OLCI. In chlorophyll-a retrieval, the choice of distance metric directly impacted the accuracy of the OLCI sensor, inducing bidirectional bias, comprising both overestimation and underestimation, which varied depending on the selected metric. These results underscore the critical importance of optimizing distance metric selection to enhance prediction accuracy and mitigate systematic errors in remote sensing applications. Furthermore, the results revealed that the implementation of this algorithm exhibited substantially superior performance compared to other evaluated algorithms within the study area, achieving significantly higher accuracy metrics. Thereby establishing k-NN as the optimal framework for satellite-based water quality monitoring in environmentally sensitive regions like PSEEZ.
{"title":"Comparative analysis of k-nearest neighbors distance metrics for retrieving coastal water quality based on concurrent in situ and satellite observations","authors":"Bonyad Ahmadi , Mehdi Gholamalifard , Seyed Mahmoud Ghasempouri , Tiit Kutser","doi":"10.1016/j.marpolbul.2025.117816","DOIUrl":"10.1016/j.marpolbul.2025.117816","url":null,"abstract":"<div><div>It is time consuming and expensive to monitor extensive areas of coastal waters with sufficient frequency using in situ (ship based) methods. Satellite remote sensing is much more cost effective. Satellites can detect Optically Active Constituents (OACs) in water. Therefore, it is crucial to know the concentrations of OACs in the study area in order to develop and validate remote sensing methods suitable for assessing water quality in this region. The Pars Special Economic Energy Zone (PSEEZ), a major hub of natural gas extraction in the Persian Gulf, has undergone rapid industrial expansion since 1998, intensifying environmental pressures and necessitating high-resolution, frequent water quality assessments. However, a structured, long-term monitoring framework is absent despite the significance of this region. In order to develop satellite-based remote sensing methods for this region we carried out measurements of different OACs (chlorophyll-a, coloured dissolved organic matter (CDOM) and turbidity) and tested Landsat 8, Sentinel-2, and Sentinel-3 performance in retrieving the OACs. We tested the k-Nearest Neighbors machine learning algorithm. The selection of distance metrics demonstrated a significant influence on the accuracy of retrieving OACs. In turbidity retrieval, the Euclidean Distance (ED) enhanced the regression slope to 0.90 (a 55.17 % improvement over Fuzzy Mahalanobis Distance (FD)) and reduced the RMSLE to 0.51, corresponding to an approximate 160 % enhancement in precision. For CDOM, RMSLE values for ED and FD were 0.39 and 0.48, respectively, indicating an 18.75 % improvement favoring ED. Furthermore, bias analysis revealed deviations of 1–6 % compared to reference data, with the lowest values observed for Mahalanobis Distance (MD) with MSI and FD with OLCI. In chlorophyll-a retrieval, the choice of distance metric directly impacted the accuracy of the OLCI sensor, inducing bidirectional bias, comprising both overestimation and underestimation, which varied depending on the selected metric. These results underscore the critical importance of optimizing distance metric selection to enhance prediction accuracy and mitigate systematic errors in remote sensing applications. Furthermore, the results revealed that the implementation of this algorithm exhibited substantially superior performance compared to other evaluated algorithms within the study area, achieving significantly higher accuracy metrics. Thereby establishing k-NN as the optimal framework for satellite-based water quality monitoring in environmentally sensitive regions like PSEEZ.</div></div>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"214 ","pages":"Article 117816"},"PeriodicalIF":5.3,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143611038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-03-13DOI: 10.1016/j.marpolbul.2025.117793
Mohammad E. Al Mukaimi , Justin Cerv , Timothy Dellapenna , Huda Alaskar , Jenan Dashti , Abdulhadi Esmaeil
Sulaibikhat Bay, a shallow estuarine embayment in the southern part of Kuwait Bay, has undergone substantial anthropogenic impacts over the past decade, resulting in altered sediment quality and mercury (T-Hg) contamination. This bay, bordered by the Doha Power Plant and Shuwaikh Port, receives untreated sewage and industrial waste through 17 outfalls, nine of which remain active. To assess the extent of contamination, 44 surface sediment samples were analyzed for T-Hg concentrations and fluxes. T-Hg concentrations ranged from 8 to 800 ng g−1, averaging 74 ng g−1. Elevated levels were observed predominantly on the eastern side of the bay, with a maximum of 800 ng g−1 near Outfall 3. In contrast, the western side exhibited lower concentrations, ranging from 17 to 50 ng g−1. Mercury fluxes mirrored this spatial pattern, with the highest flux recorded at 250 ng cm−2 yr−1. Assessment using enrichment factors and the geoaccumulation index indicated that western bay sediments are uncontaminated to moderately contaminated, while the eastern side is moderately to strongly contaminated, with some areas classified as extremely contaminated. Although most T-Hg concentrations were below Interim Sediment Quality Guideline (ISQG) thresholds, location H41 exceeded the Probable Effect Level (PEL) at 800 ng g−1. These findings, consistent with previous studies, raise concerns about higher mercury levels in deeper sediments, which could resuspend during dredging or coastal development, increasing risks to the marine ecosystem. This study highlights the urgent need for a strategic management plan to mitigate contamination, protect the bay, and guide future monitoring and conservation efforts.
{"title":"Spatial analysis of total mercury concentration in surface sediments in Sulaibikhat Bay, Kuwait","authors":"Mohammad E. Al Mukaimi , Justin Cerv , Timothy Dellapenna , Huda Alaskar , Jenan Dashti , Abdulhadi Esmaeil","doi":"10.1016/j.marpolbul.2025.117793","DOIUrl":"10.1016/j.marpolbul.2025.117793","url":null,"abstract":"<div><div>Sulaibikhat Bay, a shallow estuarine embayment in the southern part of Kuwait Bay, has undergone substantial anthropogenic impacts over the past decade, resulting in altered sediment quality and mercury (T-Hg) contamination. This bay, bordered by the Doha Power Plant and Shuwaikh Port, receives untreated sewage and industrial waste through 17 outfalls, nine of which remain active. To assess the extent of contamination, 44 surface sediment samples were analyzed for T-Hg concentrations and fluxes. T-Hg concentrations ranged from 8 to 800 ng g<sup>−1</sup>, averaging 74 ng g<sup>−1</sup>. Elevated levels were observed predominantly on the eastern side of the bay, with a maximum of 800 ng g<sup>−1</sup> near Outfall 3. In contrast, the western side exhibited lower concentrations, ranging from 17 to 50 ng g<sup>−1</sup>. Mercury fluxes mirrored this spatial pattern, with the highest flux recorded at 250 ng cm<sup>−2</sup> yr<sup>−1</sup>. Assessment using enrichment factors and the geoaccumulation index indicated that western bay sediments are uncontaminated to moderately contaminated, while the eastern side is moderately to strongly contaminated, with some areas classified as extremely contaminated. Although most T-Hg concentrations were below Interim Sediment Quality Guideline (ISQG) thresholds, location H41 exceeded the Probable Effect Level (PEL) at 800 ng g<sup>−1</sup>. These findings, consistent with previous studies, raise concerns about higher mercury levels in deeper sediments, which could resuspend during dredging or coastal development, increasing risks to the marine ecosystem. This study highlights the urgent need for a strategic management plan to mitigate contamination, protect the bay, and guide future monitoring and conservation efforts.</div></div>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"214 ","pages":"Article 117793"},"PeriodicalIF":5.3,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143611041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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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