Pub Date : 2026-01-27DOI: 10.1016/j.rsma.2026.104814
Lukas Marx , Michelle Hale , B.B. Cael , Sarah Reynolds
The coastal ocean’s ecosystem resilience is consistently hampered by the compounding impacts of projected climate change and anthropogenic perturbation. In this microcosm study, we investigated how elevated temperature and pCO2, together with episodic nutrient pollution and a short-term marine heatwave, affect the nano- and picoplanktonic community of primary producers and subsequent changes in coastal biogeochemistry. Our study demonstrates that future elevated temperature and pCO2 conditions impact the planktonic community, first by a ∼ 50 % decreased autotrophic abundance, and second by a shift from larger eukaryotic to smaller cells. When combined with a heatwave, total primary producers experienced an additional 37–38 % decrease, indicative of a negative synergistic effect beyond either stressor alone. Picoeukaryotes were particularly sensitive, declining by 44–50 %. Short-term nutrient pollution under ambient conditions induced a 41 % increase in cell abundance, but failed to stimulate biomass under elevated temperature and pCO2, and instead led to altered organic matter dynamics, including significantly lower carbon fixation. These findings emphasize the need for further evaluation of multi-stressor interactions to better understand biogeochemical vulnerability, nutrient retention, and ecological functioning in coastal ecosystems undergoing rapid climatic and anthropogenic change.
{"title":"Acute microbial and nutrient responses to elevated temperature and pCO2: A coastal UK microcosm study","authors":"Lukas Marx , Michelle Hale , B.B. Cael , Sarah Reynolds","doi":"10.1016/j.rsma.2026.104814","DOIUrl":"10.1016/j.rsma.2026.104814","url":null,"abstract":"<div><div>The coastal ocean’s ecosystem resilience is consistently hampered by the compounding impacts of projected climate change and anthropogenic perturbation. In this microcosm study, we investigated how elevated temperature and <em>p</em>CO<sub>2</sub>, together with episodic nutrient pollution and a short-term marine heatwave, affect the nano- and picoplanktonic community of primary producers and subsequent changes in coastal biogeochemistry. Our study demonstrates that future elevated temperature and <em>p</em>CO<sub>2</sub> conditions impact the planktonic community, first by a ∼ 50 % decreased autotrophic abundance, and second by a shift from larger eukaryotic to smaller cells. When combined with a heatwave, total primary producers experienced an additional 37–38 % decrease, indicative of a negative synergistic effect beyond either stressor alone. Picoeukaryotes were particularly sensitive, declining by 44–50 %. Short-term nutrient pollution under ambient conditions induced a 41 % increase in cell abundance, but failed to stimulate biomass under elevated temperature and <em>p</em>CO<sub>2</sub>, and instead led to altered organic matter dynamics, including significantly lower carbon fixation. These findings emphasize the need for further evaluation of multi-stressor interactions to better understand biogeochemical vulnerability, nutrient retention, and ecological functioning in coastal ecosystems undergoing rapid climatic and anthropogenic change.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104814"},"PeriodicalIF":2.4,"publicationDate":"2026-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146057417","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}
Seagrass percent cover (PC) is a key indicator of seagrass ecosystem condition, reflecting habitat quality and levels of degradation. Mapping seagrass PC using remote sensing typically requires field-based reference data for model training and validation, frequently derived from photo-quadrat surveys. An alternative approach involves indirect estimation using high-spatial-resolution imagery, including compressed imagery available through Google Earth platform (hi-res imagery). This study evaluates the effectiveness of using hi-res imagery to generate training and validation data for seagrass PC mapping with Sentinel-2 imagery. Six seagrass meadows representing a range of seagrass densities and species compositions were selected. Reference seagrass PC data were derived by analysing hi-res imagery using ISODATA unsupervised classification within grid cells corresponding to the Sentinel-2 ground sampling distance (GSD). A Random Forest (RF) regression model was then developed to map seagrass PC. Model performance was evaluated using the coefficient of determination (R²), root mean square error (RMSE), and 1:1 scatter plots. The results demonstrate that hi-res imagery can be effectively used to generate seagrass PC reference data for training and validating Sentinel-2–based RF regression models, achieving an RMSE of less than 25 %. This approach produces reference data that are spatially consistent with Sentinel-2 GSD and provides a more efficient and cost-effective alternative to extensive field photo-quadrat surveys or the acquisition of original high-resolution imagery. Integrating medium and high-spatial-resolution imagery is therefore recommended for seagrass PC mapping, as it provides a practical, scalable, and cost-effective framework for long-term seagrass ecosystem monitoring and management.
{"title":"Compressed high-spatial-resolution imagery to train and validate seagrass percent cover mapping using sentinel-2 imagery","authors":"Pramaditya Wicaksono , Setiawan Djody Harahap , Safina Rajwaa Ananda , Kevin Oit Benyamin , Rahma Izzatun Nabiha , Valentia Widia Maharsi","doi":"10.1016/j.rsma.2026.104808","DOIUrl":"10.1016/j.rsma.2026.104808","url":null,"abstract":"<div><div>Seagrass percent cover (PC) is a key indicator of seagrass ecosystem condition, reflecting habitat quality and levels of degradation. Mapping seagrass PC using remote sensing typically requires field-based reference data for model training and validation, frequently derived from photo-quadrat surveys. An alternative approach involves indirect estimation using high-spatial-resolution imagery, including compressed imagery available through Google Earth platform (hi-res imagery). This study evaluates the effectiveness of using hi-res imagery to generate training and validation data for seagrass PC mapping with Sentinel-2 imagery. Six seagrass meadows representing a range of seagrass densities and species compositions were selected. Reference seagrass PC data were derived by analysing hi-res imagery using ISODATA unsupervised classification within grid cells corresponding to the Sentinel-2 ground sampling distance (GSD). A Random Forest (RF) regression model was then developed to map seagrass PC. Model performance was evaluated using the coefficient of determination (<em>R</em>²), root mean square error (RMSE), and 1:1 scatter plots. The results demonstrate that hi-res imagery can be effectively used to generate seagrass PC reference data for training and validating Sentinel-2–based RF regression models, achieving an RMSE of less than 25 %. This approach produces reference data that are spatially consistent with Sentinel-2 GSD and provides a more efficient and cost-effective alternative to extensive field photo-quadrat surveys or the acquisition of original high-resolution imagery. Integrating medium and high-spatial-resolution imagery is therefore recommended for seagrass PC mapping, as it provides a practical, scalable, and cost-effective framework for long-term seagrass ecosystem monitoring and management.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104808"},"PeriodicalIF":2.4,"publicationDate":"2026-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146090454","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 : 2026-01-27DOI: 10.1016/j.rsma.2026.104809
Ángel Escamilla-Aké , Luis Enrique Angeles-Gonzalez , Ángel Rojo-Cebreros , Alejandro Kurczyn , Carlos Rosas
Climate change poses a significant threat to marine ecosystems with rising sea temperatures, particularly affecting the thermal performance and fitness of marine ectotherms, such as Octopus maya. The present study developed a prospective model to assess the impact of temperature changes on O. maya populations in the Campeche Bank, a key fishing region in the Gulf of Mexico. The model integrates physiological data with thermal gradients estimates across three distinct zones: upwelling (Zone I), transitional (Zone II), and non-upwelling (Zone III), and incorporates the instantaneous effects of temperature on performance and tolerance time. The results indicate that O. maya exhibits optimal fitness within a temperature range of 21°C to 26°C, with a significant decrease in fitness as temperatures exceed 26°C, particularly in warmer Zone III. Continuous bottom temperature monitoring is essential, especially in shallow coastal waters where O. maya is harvested by artisanal fishers to assess long-term viability. The findings highlight the importance of integrating environmental monitoring with adaptive management strategies to mitigate climate change impacts on this valuable species and the coastal communities that depend on it.
{"title":"Projecting climate change impacts on thermal performance and fitness of Octopus maya in the Campeche Bank","authors":"Ángel Escamilla-Aké , Luis Enrique Angeles-Gonzalez , Ángel Rojo-Cebreros , Alejandro Kurczyn , Carlos Rosas","doi":"10.1016/j.rsma.2026.104809","DOIUrl":"10.1016/j.rsma.2026.104809","url":null,"abstract":"<div><div>Climate change poses a significant threat to marine ecosystems with rising sea temperatures, particularly affecting the thermal performance and fitness of marine ectotherms, such as <em>Octopus maya</em>. The present study developed a prospective model to assess the impact of temperature changes on <em>O. maya</em> populations in the Campeche Bank, a key fishing region in the Gulf of Mexico. The model integrates physiological data with thermal gradients estimates across three distinct zones: upwelling (Zone I), transitional (Zone II), and non-upwelling (Zone III), and incorporates the instantaneous effects of temperature on performance and tolerance time. The results indicate that <em>O. maya</em> exhibits optimal fitness within a temperature range of 21°C to 26°C, with a significant decrease in fitness as temperatures exceed 26°C, particularly in warmer Zone III. Continuous bottom temperature monitoring is essential, especially in shallow coastal waters where <em>O. maya</em> is harvested by artisanal fishers to assess long-term viability. The findings highlight the importance of integrating environmental monitoring with adaptive management strategies to mitigate climate change impacts on this valuable species and the coastal communities that depend on it.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104809"},"PeriodicalIF":2.4,"publicationDate":"2026-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146057415","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 : 2026-01-26DOI: 10.1016/j.rsma.2026.104813
Pedro C. González-Espinosa , Mohammad Nasir Tighsazzadeh , Helena Julietta Debus , Muhammed A. Oyinlola , William W.L. Cheung , Gabriel Reygondeau , Andrés M. Cisneros-Montemayor
The Blue Economy promotes ocean-based sectors that support social equity, environmental sustainability, and lasting economic development, and Canada is currently developing a national ocean strategy to meet these goals. However, climate change is reshaping ecosystems by altering variables like water temperatures, oxygen levels, acidity, sea levels, wind, and current patterns, with direct consequences for sectors that rely on ocean resources. This study projects the future availability of marine resources in Canada for fisheries, mariculture, ocean energy, blue carbon, and ecotourism, with a focus on regional differences and impacts on coastal communities that depend on them. Across Canada’s Pacific, Arctic, and Atlantic coasts, results indicate mixed outcomes depending on the region and climate scenario. By the end of the century, compared to today, mean changes in resource potential under a low-emissions scenario (SSP1–2.6) are projected to range from approximately + 1 % to + 18 %, while under a high-emissions scenario (SSP5–8.5), from approximately −7 % to + 38 %, depending on the region. Nationally, average availability is projected to rise by 5.7 % (SSP1–2.6) and 8.6 % (SSP5–8.5). However, these averages obscure severe, localised declines, particularly in parts of the Arctic and East Coast, where resource availability could decrease by up to 50 %. Such declines could directly affect the livelihoods of approximately 6000 people, primarily in Indigenous communities, employed in the fisheries and aquaculture sectors. These findings demonstrate the need for local, regional, and national adaptive climate-resilient policy frameworks that prioritise support for coastal communities, foster inclusive leadership, promote equity in benefits and responsibilities, and ensure the long-term sustainability of ocean-dependent livelihoods and ecosystems.
{"title":"Projecting the future of Canada’s ocean resources for a Blue Economy","authors":"Pedro C. González-Espinosa , Mohammad Nasir Tighsazzadeh , Helena Julietta Debus , Muhammed A. Oyinlola , William W.L. Cheung , Gabriel Reygondeau , Andrés M. Cisneros-Montemayor","doi":"10.1016/j.rsma.2026.104813","DOIUrl":"10.1016/j.rsma.2026.104813","url":null,"abstract":"<div><div>The Blue Economy promotes ocean-based sectors that support social equity, environmental sustainability, and lasting economic development, and Canada is currently developing a national ocean strategy to meet these goals. However, climate change is reshaping ecosystems by altering variables like water temperatures, oxygen levels, acidity, sea levels, wind, and current patterns, with direct consequences for sectors that rely on ocean resources. This study projects the future availability of marine resources in Canada for fisheries, mariculture, ocean energy, blue carbon, and ecotourism, with a focus on regional differences and impacts on coastal communities that depend on them. Across Canada’s Pacific, Arctic, and Atlantic coasts, results indicate mixed outcomes depending on the region and climate scenario. By the end of the century, compared to today, mean changes in resource potential under a low-emissions scenario (SSP1–2.6) are projected to range from approximately + 1 % to + 18 %, while under a high-emissions scenario (SSP5–8.5), from approximately −7 % to + 38 %, depending on the region. Nationally, average availability is projected to rise by 5.7 % (SSP1–2.6) and 8.6 % (SSP5–8.5). However, these averages obscure severe, localised declines, particularly in parts of the Arctic and East Coast, where resource availability could decrease by up to 50 %. Such declines could directly affect the livelihoods of approximately 6000 people, primarily in Indigenous communities, employed in the fisheries and aquaculture sectors. These findings demonstrate the need for local, regional, and national adaptive climate-resilient policy frameworks that prioritise support for coastal communities, foster inclusive leadership, promote equity in benefits and responsibilities, and ensure the long-term sustainability of ocean-dependent livelihoods and ecosystems.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104813"},"PeriodicalIF":2.4,"publicationDate":"2026-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146057418","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 : 2026-01-26DOI: 10.1016/j.rsma.2026.104806
Edgar Abraham Aragón-Flores , Rocío Rodiles-Hernández , Miriam Soria-Barreto , Matteo Cazzanelli , Carmen G. Montaña , María M. Castillo
Estuarine food webs are shaped by connectivity with adjacent ecosystems and seasonal hydrological changes that influence resource availability and trophic structure. In this study, we used stable isotopes (δ13C and δ15N) to evaluate the food web structure of fish assemblages in two tropical estuarine lagoon systems in the southern Gulf of Mexico that differ in freshwater and marine connectivity. Stable isotope diversity metrics were applied to assess spatial and seasonal variation in isotopic niche structure and to estimate trophic similarity between resident and marine transient fish groups. Our results indicated marked spatial differences in food web structure between systems. In the Pom-Atasta system, fish assemblages exhibited longer food web chains, greater diversity of assimilated resources, and higher trophic diversity and specialization. In contrast, fish assemblages in the Palizada del Este system reflected stronger hydrological connectivity, characterized by lower carbon isotope values, higher nitrogen isotope values, and more uniform resource use. Seasonal patterns were consistent across both systems: during the rainy season, consumers displayed greater trophic specialization, whereas during the “nortes” season, carbon isotope values were lower and trophic similarity between resident and marine transient fishes increased. Overall, spatial variation in food web structure highlights the complexity of ecosystem functioning in estuarine lagoon systems and reflects differences in geomorphological configuration, autochthonous productivity, and freshwater–marine connectivity. Seasonal changes underscore the importance of resource inputs associated with the flood pulse from the Usumacinta Basin in these estuarine ecosystems.
河口食物网是由与邻近生态系统的连通性和影响资源可用性和营养结构的季节性水文变化形成的。在这项研究中，我们使用稳定同位素（δ13C和δ15N）来评估墨西哥湾南部两个淡水和海洋连通性不同的热带河口泻湖系统中鱼类组合的食物网结构。稳定同位素多样性指标被应用于评估同位素生态位结构的空间和季节变化，并估计居民和海洋洄游鱼类群体之间的营养相似性。我们的研究结果表明，不同系统之间的食物网结构存在显著的空间差异。在Pom-Atasta系统中，鱼类群落表现出更长的食物链、更大的同化资源多样性、更高的营养多样性和专业化。相比之下，Palizada del Este系统的鱼类组合具有较强的水文连通性，其特征是碳同位素值较低，氮同位素值较高，资源利用更均匀。季节模式在两个系统中是一致的：在雨季，消费者表现出更大的营养专业化，而在“北风”季节，碳同位素值较低，居民和海洋洄游鱼类之间的营养相似性增加。总体而言，食物网结构的空间变化突出了河口泻湖系统生态系统功能的复杂性，反映了地貌配置、本地生产力和淡水-海洋连通性的差异。季节变化强调了与乌苏马辛塔盆地洪水脉冲相关的资源投入在这些河口生态系统中的重要性。
{"title":"Estuarine structure and connectivity influence seasonal and spatial shifts in the food web structure of fish assemblages","authors":"Edgar Abraham Aragón-Flores , Rocío Rodiles-Hernández , Miriam Soria-Barreto , Matteo Cazzanelli , Carmen G. Montaña , María M. Castillo","doi":"10.1016/j.rsma.2026.104806","DOIUrl":"10.1016/j.rsma.2026.104806","url":null,"abstract":"<div><div>Estuarine food webs are shaped by connectivity with adjacent ecosystems and seasonal hydrological changes that influence resource availability and trophic structure. In this study, we used stable isotopes (δ<sup>13</sup>C and δ<sup>15</sup>N) to evaluate the food web structure of fish assemblages in two tropical estuarine lagoon systems in the southern Gulf of Mexico that differ in freshwater and marine connectivity. Stable isotope diversity metrics were applied to assess spatial and seasonal variation in isotopic niche structure and to estimate trophic similarity between resident and marine transient fish groups. Our results indicated marked spatial differences in food web structure between systems. In the Pom-Atasta system, fish assemblages exhibited longer food web chains, greater diversity of assimilated resources, and higher trophic diversity and specialization. In contrast, fish assemblages in the Palizada del Este system reflected stronger hydrological connectivity, characterized by lower carbon isotope values, higher nitrogen isotope values, and more uniform resource use. Seasonal patterns were consistent across both systems: during the rainy season, consumers displayed greater trophic specialization, whereas during the “nortes” season, carbon isotope values were lower and trophic similarity between resident and marine transient fishes increased. Overall, spatial variation in food web structure highlights the complexity of ecosystem functioning in estuarine lagoon systems and reflects differences in geomorphological configuration, autochthonous productivity, and freshwater–marine connectivity. Seasonal changes underscore the importance of resource inputs associated with the flood pulse from the Usumacinta Basin in these estuarine ecosystems.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104806"},"PeriodicalIF":2.4,"publicationDate":"2026-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146090358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-26DOI: 10.1016/j.rsma.2026.104804
Muhandis Sidqi , Dietriech G. Bengen , Maret Priyanta , Eva Anggraini , Lilis Sadiyah , Tirtadanu
Marine ecotourism holds significant potential as a driver for sustainable economic development and environmental conservation, particularly in destinations like the Gili Matra Marine Conservation Area (GMMCA). This research aims to perform an economic valuation of marine ecotourism within the Gili Matra Marine Conservation Area. The study employed the Travel Cost Method (TCM) approach, integrating a tourist survey, Focus Group Discussions (FGD) with stakeholders, and secondary data analysis. The analysis results indicate that tourism demand is influenced by travel distance to the destination (for both domestic and international tourists), and by education level (for international tourists). Consumer surplus was recorded at 712,221.07 Indonesian Rupiahs (IDR) per individual for domestic tourists and USD25.41 per individual for international tourists, with total economic values reaching 467.53 billion IDR and USD16.68 million, respectively. Domestic tourists spend more money within the conservation area compared to outside, while international tourists' expenditures are higher outside the area than inside. The largest direct economic impact is generated by food and beverage kiosks, the indirect impact stems from raw material purchases, and the highest induced impact is generated by diving services. The multiplier effect analysis shows that the Keynesian Income Multiplier is still low, but the Type I and Type II Ratio Income Multipliers are greater than 1, indicating a strong local economic circulation. Marine ecotourism in Gili Matra has provided substantial benefits to the local economy, created business opportunities, and absorbed labor. However, further strategies are necessary to enhance the economic leverage and ensure a more equitable distribution of the economic impact for the surrounding communities.
{"title":"Sustainable management of marine ecotourism in the Gili Matra Marine Conservation Area: An economic valuation and stakeholder-based approach","authors":"Muhandis Sidqi , Dietriech G. Bengen , Maret Priyanta , Eva Anggraini , Lilis Sadiyah , Tirtadanu","doi":"10.1016/j.rsma.2026.104804","DOIUrl":"10.1016/j.rsma.2026.104804","url":null,"abstract":"<div><div>Marine ecotourism holds significant potential as a driver for sustainable economic development and environmental conservation, particularly in destinations like the Gili Matra Marine Conservation Area (GMMCA). This research aims to perform an economic valuation of marine ecotourism within the Gili Matra Marine Conservation Area. The study employed the Travel Cost Method (TCM) approach, integrating a tourist survey, Focus Group Discussions (FGD) with stakeholders, and secondary data analysis. The analysis results indicate that tourism demand is influenced by travel distance to the destination (for both domestic and international tourists), and by education level (for international tourists). Consumer surplus was recorded at 712,221.07 Indonesian Rupiahs (IDR) per individual for domestic tourists and USD25.41 per individual for international tourists, with total economic values reaching 467.53 billion IDR and USD16.68 million, respectively. Domestic tourists spend more money within the conservation area compared to outside, while international tourists' expenditures are higher outside the area than inside. The largest direct economic impact is generated by food and beverage kiosks, the indirect impact stems from raw material purchases, and the highest induced impact is generated by diving services. The multiplier effect analysis shows that the Keynesian Income Multiplier is still low, but the Type I and Type II Ratio Income Multipliers are greater than 1, indicating a strong local economic circulation. Marine ecotourism in Gili Matra has provided substantial benefits to the local economy, created business opportunities, and absorbed labor. However, further strategies are necessary to enhance the economic leverage and ensure a more equitable distribution of the economic impact for the surrounding communities.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104804"},"PeriodicalIF":2.4,"publicationDate":"2026-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146090455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-26DOI: 10.1016/j.rsma.2026.104803
Aline S. Martinez , Rosana M. Rocha , Ronaldo A. Christofoletti , Leandro M. Vieira , Ulisses S. Pinheiro , Maria Angélica Haddad , Igor E.G. Pinheiro , Franciane M. Pellizzari , Lumi Haraguchi , André Pardal
The construction and deployment of artificial structures (AS) in the marine environment is rapidly expanding worldwide with urban sprawl. AS cause biodiversity loss, facilitate bioinvasion, and affect species connectivity. The capacity of natural ecosystems to sustain biodiversity and deliver goods and services relies on the effective management of human activities in a sustainable manner. This is particularly worrying for developing nations, where coastal urbanisation is pacing faster whilst local human communities rely on fisheries and tourism. The aim of this review was to synthesize current knowledge on the ecological role of artificial structures on marine and estuarine biota in Brazil, considering both their positive and negative ecological effects. Based on 124 peer-reviewed studies, we show that research is spatially fragmented and largely focused on artificial reefs and fish ecology. Fish abundance was often greater around AS compared to sedimentary natural habitats. Over 40 % of the studies were descriptive, focused on the distribution of species or bioinvasion. Of 1017 species recorded on AS, 71 were exotic (all benthic invertebrates), mostly ascidians and bryozoans. Managerial strategies would benefit from quantitative comparative research between AS and natural habitats, focused on different taxonomic groups other than ichthyofauna, using variables that reflect ecosystem functions. Enhancing local biodiversity and improving ecosystem functioning in urbanized areas may be achieved from nature-based solutions research, such as marine eco-engineering. Finally, understanding long term impacts of AS, their role in spreading exotic and cryptogenic species, and the extent of sea-land modification by AS is a further urgent knowledge demand for sustainable urban planning and coastal management.
{"title":"Ecological role of artificial structures on marine and estuarine biota in Brazil: Current knowledge and implications for management","authors":"Aline S. Martinez , Rosana M. Rocha , Ronaldo A. Christofoletti , Leandro M. Vieira , Ulisses S. Pinheiro , Maria Angélica Haddad , Igor E.G. Pinheiro , Franciane M. Pellizzari , Lumi Haraguchi , André Pardal","doi":"10.1016/j.rsma.2026.104803","DOIUrl":"10.1016/j.rsma.2026.104803","url":null,"abstract":"<div><div>The construction and deployment of artificial structures (AS) in the marine environment is rapidly expanding worldwide with urban sprawl. AS cause biodiversity loss, facilitate bioinvasion, and affect species connectivity. The capacity of natural ecosystems to sustain biodiversity and deliver goods and services relies on the effective management of human activities in a sustainable manner. This is particularly worrying for developing nations, where coastal urbanisation is pacing faster whilst local human communities rely on fisheries and tourism. The aim of this review was to synthesize current knowledge on the ecological role of artificial structures on marine and estuarine biota in Brazil, considering both their positive and negative ecological effects. Based on 124 peer-reviewed studies, we show that research is spatially fragmented and largely focused on artificial reefs and fish ecology. Fish abundance was often greater around AS compared to sedimentary natural habitats. Over 40 % of the studies were descriptive, focused on the distribution of species or bioinvasion. Of 1017 species recorded on AS, 71 were exotic (all benthic invertebrates), mostly ascidians and bryozoans. Managerial strategies would benefit from quantitative comparative research between AS and natural habitats, focused on different taxonomic groups other than ichthyofauna, using variables that reflect ecosystem functions. Enhancing local biodiversity and improving ecosystem functioning in urbanized areas may be achieved from nature-based solutions research, such as marine eco-engineering. Finally, understanding long term impacts of AS, their role in spreading exotic and cryptogenic species, and the extent of sea-land modification by AS is a further urgent knowledge demand for sustainable urban planning and coastal management.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104803"},"PeriodicalIF":2.4,"publicationDate":"2026-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146090453","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 : 2026-01-24DOI: 10.1016/j.rsma.2026.104798
Vinicius Henrique Maciel dos Santos , Francisco José da Silva Dias , Audalio Rebelo Torrres Júnior , Pedro Walfir Martins e Souza Filho
In large-scale macrotidal estuaries, comprehensive studies that quantify the transport of volume (water discharge), sediment, and salt across different spatial and temporal scales are still scarce. This study investigated the seasonal variability in the transport of volume, suspended particulate matter (SPM), and salt within the São Marcos Estuarine Complex (SMEC), a macrotidal estuary situated in the Amazon coast. Surveys were conducted during the dry and rainy seasons, during spring and neap tides, in cross sections in the upper (UE), middle (ME), and lower (LE) sectors of the estuary. The results indicate that volume transport depends mainly on the tide and increases downstream due to channel morphology. SPM transport was linked to particle resuspension and was more pronounced during the dry season. In the ME, this transport stands out for its turbidity maximum zone and funnel-shaped morphology, which leads to retention. Seasonal salt transport was dominated by Stokes drift, being directed upstream during the dry season and downstream during the rainy season. Salt intrusion intensifies in the dry season because river discharge is substantially lower than in the rainy season. In the SMEC, the tide is the primary driver of the transport of volume, SPM, and salt, while river discharge sets the seasonal contrast, and morphology organizes the retention and export zones. These findings provide new insights for management and planning in high-energy systems.
{"title":"Hydrodynamic control on the transport of volume, suspended particulate matter, and salt in an Amazonian macrotidal estuary","authors":"Vinicius Henrique Maciel dos Santos , Francisco José da Silva Dias , Audalio Rebelo Torrres Júnior , Pedro Walfir Martins e Souza Filho","doi":"10.1016/j.rsma.2026.104798","DOIUrl":"10.1016/j.rsma.2026.104798","url":null,"abstract":"<div><div>In large-scale macrotidal estuaries, comprehensive studies that quantify the transport of volume (water discharge), sediment, and salt across different spatial and temporal scales are still scarce. This study investigated the seasonal variability in the transport of volume, suspended particulate matter (SPM), and salt within the São Marcos Estuarine Complex (SMEC), a macrotidal estuary situated in the Amazon coast. Surveys were conducted during the dry and rainy seasons, during spring and neap tides, in cross sections in the upper (UE), middle (ME), and lower (LE) sectors of the estuary. The results indicate that volume transport depends mainly on the tide and increases downstream due to channel morphology. SPM transport was linked to particle resuspension and was more pronounced during the dry season. In the ME, this transport stands out for its turbidity maximum zone and funnel-shaped morphology, which leads to retention. Seasonal salt transport was dominated by Stokes drift, being directed upstream during the dry season and downstream during the rainy season. Salt intrusion intensifies in the dry season because river discharge is substantially lower than in the rainy season. In the SMEC, the tide is the primary driver of the transport of volume, SPM, and salt, while river discharge sets the seasonal contrast, and morphology organizes the retention and export zones. These findings provide new insights for management and planning in high-energy systems.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104798"},"PeriodicalIF":2.4,"publicationDate":"2026-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146057416","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 : 2026-01-23DOI: 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":"2026-01-23","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 : 2026-01-23DOI: 10.1016/j.rsma.2026.104796
Hamdy E. Nour , Mohammed H. Aljahdali
This study provides a database of environmental and health risks for the most common potentially toxic elements (PTEs) in Quseir coastal sediments. Twenty-four sediment samples were collected along the Red Sea coast of Quseir and analyzed for Pb, Co, Cr, and As using atomic absorption spectrometry. Contamination was assessed through pollution indices, including the contamination factor (Cf), modified contamination degree (mCdeg), and pollution load index (PLI), all of which indicate that PTE levels remain within safe limits. A comparative evaluation against global sediment quality standards reveals concentrations lower than those reported in heavily industrialized regions yet highlights the need for continued monitoring. Health risk assessments, considering ingestion, dermal contact, and inhalation exposure pathways, reveal no risks for both adults and children, though chronic daily intake (CDI) values are higher in children. Hazard quotient (HQ) and health risk index (HRI) values remain below threshold levels. Cancer risk (CR) estimates fall within acceptable limits, with ingestion identified as the most significant exposure route. This work advances regional scientific understanding and emphasizes the necessity of sustained monitoring and management to safeguard long-term environmental quality and resource sustainability.
{"title":"Risk assessment of potentially toxic elements in the coastal sediments of Quseir, Red Sea: Environmental and health perspectives","authors":"Hamdy E. Nour , Mohammed H. Aljahdali","doi":"10.1016/j.rsma.2026.104796","DOIUrl":"10.1016/j.rsma.2026.104796","url":null,"abstract":"<div><div>This study provides a database of environmental and health risks for the most common potentially toxic elements (PTEs) in Quseir coastal sediments. Twenty-four sediment samples were collected along the Red Sea coast of Quseir and analyzed for Pb, Co, Cr, and As using atomic absorption spectrometry. Contamination was assessed through pollution indices, including the contamination factor (<em>Cf</em>), modified contamination degree (<em>mCdeg</em>), and pollution load index (<em>PLI</em>), all of which indicate that PTE levels remain within safe limits. A comparative evaluation against global sediment quality standards reveals concentrations lower than those reported in heavily industrialized regions yet highlights the need for continued monitoring. Health risk assessments, considering ingestion, dermal contact, and inhalation exposure pathways, reveal no risks for both adults and children, though chronic daily intake (<em>CDI</em>) values are higher in children. Hazard quotient (<em>HQ</em>) and health risk index (<em>HRI</em>) values remain below threshold levels. Cancer risk (<em>CR</em>) estimates fall within acceptable limits, with ingestion identified as the most significant exposure route. This work advances regional scientific understanding and emphasizes the necessity of sustained monitoring and management to safeguard long-term environmental quality and resource sustainability.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"94 ","pages":"Article 104796"},"PeriodicalIF":2.4,"publicationDate":"2026-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146038314","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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