首页 > 最新文献

Regional Studies in Marine Science最新文献

英文 中文
How the commercialization of live bait impacts the profitability of artisanal fishing in a Brazilian estuary: A proximity economy approach
IF 2.1 4区 环境科学与生态学 Q3 ECOLOGY Pub Date : 2025-02-03 DOI: 10.1016/j.rsma.2025.104057
Suellen Mariano da Silva , Alberto Ferreira de Amorim , Leonardo Castilho-Barros , Newton José Rodrigues da Silva , Marcelo Barbosa Henriques
The economic viability of artisanal fishing practiced in the estuarine region of Santos, São Paulo, Brazil, was evaluated, considering the hypothesis that this activity could be more profitable for fishers, with the storage and maintenance of white shrimp Litopenaeus schmitti in tanks for sale as live bait for recreational fishing. Between August 2022 and July 2023, socioeconomic and fishing production data were obtained through interviews with 282 artisanal fishers. The initial investment costs, with and without the live bait maintenance system, were, respectively, US$ 4285.79 and US$ 3663.20, and the operational cost for a 12-month cycle were, respectively, US$ 25,798.80 ( ± 26.43 standard deviation) and US$ 25,583.02. Three scenarios were proposed, considering production 20 % higher (scenario A) and 20 % lower (scenario C) in relation to normal production conditions (scenario B). A sensitivity analysis was also carried out with four models related to the possibilities of selling shrimp for consumption and live bait. Annual gross income ranged from US$47,581.20 to US$52,635.60. All scenarios and modeling were viable as they showed investment recovery capacity and a return rate higher than the minimum attractiveness rate of 12 % year−1. The alternative system for maintaining shrimp in recirculation improved profitability, ensured more security, and enabled more fishers and families to be incorporated into supplying live bait, strengthening the activity and promoting economic and social improvements in the region.
{"title":"How the commercialization of live bait impacts the profitability of artisanal fishing in a Brazilian estuary: A proximity economy approach","authors":"Suellen Mariano da Silva ,&nbsp;Alberto Ferreira de Amorim ,&nbsp;Leonardo Castilho-Barros ,&nbsp;Newton José Rodrigues da Silva ,&nbsp;Marcelo Barbosa Henriques","doi":"10.1016/j.rsma.2025.104057","DOIUrl":"10.1016/j.rsma.2025.104057","url":null,"abstract":"<div><div>The economic viability of artisanal fishing practiced in the estuarine region of Santos, São Paulo, Brazil, was evaluated, considering the hypothesis that this activity could be more profitable for fishers, with the storage and maintenance of white shrimp <em>Litopenaeus schmitti</em> in tanks for sale as live bait for recreational fishing. Between August 2022 and July 2023, socioeconomic and fishing production data were obtained through interviews with 282 artisanal fishers. The initial investment costs, with and without the live bait maintenance system, were, respectively, US$ 4285.79 and US$ 3663.20, and the operational cost for a 12-month cycle were, respectively, US$ 25,798.80 ( ± 26.43 standard deviation) and US$ 25,583.02. Three scenarios were proposed, considering production 20 % higher (scenario A) and 20 % lower (scenario C) in relation to normal production conditions (scenario B). A sensitivity analysis was also carried out with four models related to the possibilities of selling shrimp for consumption and live bait. Annual gross income ranged from US$47,581.20 to US$52,635.60. All scenarios and modeling were viable as they showed investment recovery capacity and a return rate higher than the minimum attractiveness rate of 12 % year<sup>−1</sup>. The alternative system for maintaining shrimp in recirculation improved profitability, ensured more security, and enabled more fishers and families to be incorporated into supplying live bait, strengthening the activity and promoting economic and social improvements in the region.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"83 ","pages":"Article 104057"},"PeriodicalIF":2.1,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135693","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}
引用次数: 0
Accumulation of octylphenol and nonylphenol in the fishes of Terengganu, Malaysia
IF 2.1 4区 环境科学与生态学 Q3 ECOLOGY Pub Date : 2025-02-03 DOI: 10.1016/j.rsma.2025.104061
Mohd Yusoff Nurulnadia , Baharom Mohamad Zahid , Ku Mohd Kalkausar Ku Yusof
Octylphenol (OP) and nonylphenol (NP) are two endocrine disrupting chemicals, which able to disrupt the endocrine system in biota, including fish. Thus, this study aims to determine the concentration of OP and NP in the fish. Eleven genera of fish samples were collected in the year 2018 and 2019 from three rivers of Terengganu. Target compounds in the whole sample were extracted using solvent extraction method and cleaned up using solid-phase extraction cartridges. Arius sp. presence in both years with concentration of OP (6.02 – 18.5 ng/g ww) and NP (3.55 – 13.9 ng/g ww). The concentration level in other fish genera were less than 10 ng/g ww. Kruskal-Wallis test proved that the concentration level of target compounds in fishes was significantly higher (P < 0.05) in benthopelagic and demersal fishes. Regardless of fish genera, OP concentration was significant difference spatially (P < 0.05) but not temporally. Comparing between three sample matrices, both chemicals prefer to accumulate in fish and sediment compared to water. Principal component analysis indicated that fish, especially benthic feeders (benthopelagic and demersal fish) are likely accumulating OP and NP through the sediment.
{"title":"Accumulation of octylphenol and nonylphenol in the fishes of Terengganu, Malaysia","authors":"Mohd Yusoff Nurulnadia ,&nbsp;Baharom Mohamad Zahid ,&nbsp;Ku Mohd Kalkausar Ku Yusof","doi":"10.1016/j.rsma.2025.104061","DOIUrl":"10.1016/j.rsma.2025.104061","url":null,"abstract":"<div><div>Octylphenol (OP) and nonylphenol (NP) are two endocrine disrupting chemicals, which able to disrupt the endocrine system in biota, including fish. Thus, this study aims to determine the concentration of OP and NP in the fish. Eleven genera of fish samples were collected in the year 2018 and 2019 from three rivers of Terengganu. Target compounds in the whole sample were extracted using solvent extraction method and cleaned up using solid-phase extraction cartridges. <em>Arius</em> sp. presence in both years with concentration of OP (6.02 – 18.5 ng/g ww) and NP (3.55 – 13.9 ng/g ww). The concentration level in other fish genera were less than 10 ng/g ww. Kruskal-Wallis test proved that the concentration level of target compounds in fishes was significantly higher (<em>P</em> &lt; 0.05) in benthopelagic and demersal fishes. Regardless of fish genera, OP concentration was significant difference spatially (<em>P</em> &lt; 0.05) but not temporally. Comparing between three sample matrices, both chemicals prefer to accumulate in fish and sediment compared to water. Principal component analysis indicated that fish, especially benthic feeders (benthopelagic and demersal fish) are likely accumulating OP and NP through the sediment.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"83 ","pages":"Article 104061"},"PeriodicalIF":2.1,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096821","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}
引用次数: 0
Assessment of metal accumulations and ecological risks in sediments around tuna farming in the eastern Aegean Sea
IF 2.1 4区 环境科学与生态学 Q3 ECOLOGY Pub Date : 2025-02-03 DOI: 10.1016/j.rsma.2025.104055
Aslı Başaran, Mehmet Aksu
Tuna farming has been conducted since 2002 at the sampling site located in the Eastern Aegean Sea. The long-term continuation of this activity in the region has raised concerns regarding its impact on the marine environment, particularly sediment quality. The present study investigated the accumulation of metals, total organic carbon (TOC), phosphorus, and sulfur in sediments influenced by tuna farming and changes in sediment quality using various pollution indices. The highest sulfur concentration (0.19 %) was recorded at the cage stations, indicating significant organic enrichment. The analysis revealed that the average metal concentrations followed the decreasing order of Mn > Cr > Ni > As > Co > Mo > Hg > Cd. It was observed that the concentrations of molybdate, manganese, cadmium, and mercury in the area surrounding the cages were approximately 10 % higher than those in the reference stations. The evaluation of metal analyses in the sediments indicated that farming activities increased Cd, Mn, Hg, and Mo levels at the cage stations. However, none of these metals (except As) exceeded the shale value reference levels. Although cadmium exhibited the highest concentration at the cage station according to the EF and Cf indices, the sediment was classified as having low contamination based on the Cf index. Given the relatively high background concentrations of cadmium and arsenic in the sediment and enrichment from farming-related wastes (such as bait fish and chemicals used in ship maintenance), the fish farming area can be characterized as moderately ecologically risky. While the metal levels in the sediment at the tuna farming site in the Gerence region have yet to reach critical thresholds, continuous monitoring of metals such as arsenic and cadmium in the sediment is essential to ensure the sustainability of farming activities.
{"title":"Assessment of metal accumulations and ecological risks in sediments around tuna farming in the eastern Aegean Sea","authors":"Aslı Başaran,&nbsp;Mehmet Aksu","doi":"10.1016/j.rsma.2025.104055","DOIUrl":"10.1016/j.rsma.2025.104055","url":null,"abstract":"<div><div>Tuna farming has been conducted since 2002 at the sampling site located in the Eastern Aegean Sea. The long-term continuation of this activity in the region has raised concerns regarding its impact on the marine environment, particularly sediment quality. The present study investigated the accumulation of metals, total organic carbon (TOC), phosphorus, and sulfur in sediments influenced by tuna farming and changes in sediment quality using various pollution indices. The highest sulfur concentration (0.19 %) was recorded at the cage stations, indicating significant organic enrichment. The analysis revealed that the average metal concentrations followed the decreasing order of Mn &gt; Cr &gt; Ni &gt; As &gt; Co &gt; Mo &gt; Hg &gt; Cd. It was observed that the concentrations of molybdate, manganese, cadmium, and mercury in the area surrounding the cages were approximately 10 % higher than those in the reference stations. The evaluation of metal analyses in the sediments indicated that farming activities increased Cd, Mn, Hg, and Mo levels at the cage stations. However, none of these metals (except As) exceeded the shale value reference levels. Although cadmium exhibited the highest concentration at the cage station according to the EF and Cf indices, the sediment was classified as having low contamination based on the Cf index. Given the relatively high background concentrations of cadmium and arsenic in the sediment and enrichment from farming-related wastes (such as bait fish and chemicals used in ship maintenance), the fish farming area can be characterized as moderately ecologically risky. While the metal levels in the sediment at the tuna farming site in the Gerence region have yet to reach critical thresholds, continuous monitoring of metals such as arsenic and cadmium in the sediment is essential to ensure the sustainability of farming activities.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"83 ","pages":"Article 104055"},"PeriodicalIF":2.1,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135947","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}
引用次数: 0
Population structure and reproductive biology of the marbled crab, Pachygrapsus marmoratus (Fabricius, 1787) in the south-eastern Mediterranean Sea, Alexandria, Egypt
IF 2.1 4区 环境科学与生态学 Q3 ECOLOGY Pub Date : 2025-02-01 DOI: 10.1016/j.rsma.2025.104018
Ola Mohamed Nour , Zeinab Khodary , Salwa A. El-Saidy
Pachygrapsus marmoratus is one of the most prevalent intertidal crab species in the south-eastern Mediterranean Sea. It is an indicator of a stable and biodiverse ecosystem due to its contribution to ecological balance through its diverse feeding behaviours, bioturbation, and regulation of prey populations. However, its population characteristics have not been studied to date in the Egyptian Mediterranean waters. The present work aimed to assess some biological characteristics of the P. marmoratus population from Camp Caesar shore, Alexandria, Egypt. Crabs were collected monthly from July 2023 till June 2024. The sex ratio was not significantly different from 1:1. Pachygrapsus marmoratus exhibited an 8-month reproductive season from February to September, with the highest spawning peak in April. The average carapace width of females was significantly larger compared to males. The size-frequency distribution showed a unimodal pattern for both sexes, with the maximum peak in the 20.1–25.0 mm size class. Significant differences have been revealed between the two sexes with respect to the carapace width-body wet weight, carapace width-carapace length, and carapace width-claw length relationships. The number, weight, and average size of eggs were positively correlated with the ovigerous females' carapace width and wet weight. The obtained results shed some light on the population structure of P. marmoratus, revealing its stability in the Egyptian Mediterranean Sea and offering baseline information for making comparisons with other studies, thereby enhancing the understanding of how variations in the biological and ecological characteristics of this species influence its extensive distribution along the Mediterranean and Atlantic regions.
{"title":"Population structure and reproductive biology of the marbled crab, Pachygrapsus marmoratus (Fabricius, 1787) in the south-eastern Mediterranean Sea, Alexandria, Egypt","authors":"Ola Mohamed Nour ,&nbsp;Zeinab Khodary ,&nbsp;Salwa A. El-Saidy","doi":"10.1016/j.rsma.2025.104018","DOIUrl":"10.1016/j.rsma.2025.104018","url":null,"abstract":"<div><div><em>Pachygrapsus marmoratus</em> is one of the most prevalent intertidal crab species in the south-eastern Mediterranean Sea. It is an indicator of a stable and biodiverse ecosystem due to its contribution to ecological balance through its diverse feeding behaviours, bioturbation, and regulation of prey populations. However, its population characteristics have not been studied to date in the Egyptian Mediterranean waters. The present work aimed to assess some biological characteristics of the <em>P. marmoratus</em> population from Camp Caesar shore, Alexandria, Egypt. Crabs were collected monthly from July 2023 till June 2024. The sex ratio was not significantly different from 1:1. <em>Pachygrapsus marmoratus</em> exhibited an 8-month reproductive season from February to September, with the highest spawning peak in April. The average carapace width of females was significantly larger compared to males. The size-frequency distribution showed a unimodal pattern for both sexes, with the maximum peak in the 20.1–25.0 mm size class. Significant differences have been revealed between the two sexes with respect to the carapace width-body wet weight, carapace width-carapace length, and carapace width-claw length relationships. The number, weight, and average size of eggs were positively correlated with the ovigerous females' carapace width and wet weight. The obtained results shed some light on the population structure of <em>P. marmoratus</em>, revealing its stability in the Egyptian Mediterranean Sea and offering baseline information for making comparisons with other studies, thereby enhancing the understanding of how variations in the biological and ecological characteristics of this species influence its extensive distribution along the Mediterranean and Atlantic regions.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"82 ","pages":"Article 104018"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177890","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}
引用次数: 0
Comparative analysis of macro, meso and micro waste at two tropical beaches, Southwest, Brazil
IF 2.1 4区 环境科学与生态学 Q3 ECOLOGY Pub Date : 2025-02-01 DOI: 10.1016/j.rsma.2025.104026
Julia Terra Souza Torres , Leticia Parada Moreira , Landulfo Silveira Junior , Helen Sadauskas-Henrique
The present study aimed to analyze the presence of macro, meso and micro waste at Baleia and As Ilhas beach, Southwest, Brazil. The protocol proposed in 2013 by the National Oceanic and Atmospheric Administration (NOAA), was used to carry out the assessment of marine litter. Besides identifying the chemical composition of the polymer of the plastic items found, through Raman spectroscopy. The predominance of plastic at the studied beaches was evidenced in this study, corroborating with the findings in the scientific literature, for macro waste plastics represented 51 % at As Ilhas and 48 % at Baleia beach and 65 % at As Ilhas and 89 % at Baleia beach for micro waste. The most common compounds found were Polypropylene (PP) and Polystyrene (PS). It can be inferred that the users of the beaches in question are directly linked to the presence of trash in these environments, especially due to its inadequate disposal.
{"title":"Comparative analysis of macro, meso and micro waste at two tropical beaches, Southwest, Brazil","authors":"Julia Terra Souza Torres ,&nbsp;Leticia Parada Moreira ,&nbsp;Landulfo Silveira Junior ,&nbsp;Helen Sadauskas-Henrique","doi":"10.1016/j.rsma.2025.104026","DOIUrl":"10.1016/j.rsma.2025.104026","url":null,"abstract":"<div><div>The present study aimed to analyze the presence of macro, meso and micro waste at Baleia and As Ilhas beach, Southwest, Brazil. The protocol proposed in 2013 by the National Oceanic and Atmospheric Administration (NOAA), was used to carry out the assessment of marine litter. Besides identifying the chemical composition of the polymer of the plastic items found, through Raman spectroscopy. The predominance of plastic at the studied beaches was evidenced in this study, corroborating with the findings in the scientific literature, for macro waste plastics represented 51 % at As Ilhas and 48 % at Baleia beach and 65 % at As Ilhas and 89 % at Baleia beach for micro waste. The most common compounds found were Polypropylene (PP) and Polystyrene (PS). It can be inferred that the users of the beaches in question are directly linked to the presence of trash in these environments, especially due to its inadequate disposal.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"82 ","pages":"Article 104026"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143178522","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}
引用次数: 0
Perceptions and adaptive strategies of artisanal fishers to a changing environment
IF 2.1 4区 环境科学与生态学 Q3 ECOLOGY Pub Date : 2025-02-01 DOI: 10.1016/j.rsma.2025.104045
Jahson B. Alemu I
Artisanal fishers represent a critical yet under-researched component of small-island coastal economies, where environmental changes threaten both livelihoods and marine ecosystems. Despite increasing global attention to the interaction between coral reefs and fisheries, limited studies have explored the adaptive capacity of fishers to environmental change, especially when losses in fisheries may be inevitable. This study examines the environmental perceptions, adaptive capacities, and behavioral responses of artisanal fishers to changes in marine resources, using the island of Tobago as a case study. Using face-to-face surveys, quantitative and qualitative data were collected from five fishing modalities (a-la-vive, trolling, multigear [line], trap, and spear) across seven representative fishing villages. The findings revealed that while fishing remains central to fishers’ livelihoods and cultural identity, many respondents maintain alternative livelihoods. Over the past decade, fishers reported significant declines in catch size and abundance, attributing these changes to overexploitation and environmental shifts. However, their awareness of the link between coral reef health and fishery productivity varied, with limited recognition of this link, particularly among those operating outside reef-dependent practices. In terms of adaptive capacity, multigear (line) fishers exhibited the greatest flexibility by employing diverse gear types and targeting species based on availability. In contrast, fishers using single-gear methods, such as traps and spears, demonstrated lower adaptability and higher vulnerability to changes in marine resources. Changes in fishing behaviors in response to shifts in fish stocks ranged from increasing fishing intensity to relocating to new fishing areas, highlighting potential risks of overexploitation in less-utilized areas. These findings highlight the socio-economic and ecological complexity of managing artisanal fisheries in Tobago, and emphasize the need for tailored, gear-specific management strategies that support ecological sustainability while bolstering the cultural and economic resilience of fishing communities.
{"title":"Perceptions and adaptive strategies of artisanal fishers to a changing environment","authors":"Jahson B. Alemu I","doi":"10.1016/j.rsma.2025.104045","DOIUrl":"10.1016/j.rsma.2025.104045","url":null,"abstract":"<div><div>Artisanal fishers represent a critical yet under-researched component of small-island coastal economies, where environmental changes threaten both livelihoods and marine ecosystems. Despite increasing global attention to the interaction between coral reefs and fisheries, limited studies have explored the adaptive capacity of fishers to environmental change, especially when losses in fisheries may be inevitable. This study examines the environmental perceptions, adaptive capacities, and behavioral responses of artisanal fishers to changes in marine resources, using the island of Tobago as a case study. Using face-to-face surveys, quantitative and qualitative data were collected from five fishing modalities (a-la-vive, trolling, multigear [line], trap, and spear) across seven representative fishing villages. The findings revealed that while fishing remains central to fishers’ livelihoods and cultural identity, many respondents maintain alternative livelihoods. Over the past decade, fishers reported significant declines in catch size and abundance, attributing these changes to overexploitation and environmental shifts. However, their awareness of the link between coral reef health and fishery productivity varied, with limited recognition of this link, particularly among those operating outside reef-dependent practices. In terms of adaptive capacity, multigear (line) fishers exhibited the greatest flexibility by employing diverse gear types and targeting species based on availability. In contrast, fishers using single-gear methods, such as traps and spears, demonstrated lower adaptability and higher vulnerability to changes in marine resources. Changes in fishing behaviors in response to shifts in fish stocks ranged from increasing fishing intensity to relocating to new fishing areas, highlighting potential risks of overexploitation in less-utilized areas. These findings highlight the socio-economic and ecological complexity of managing artisanal fisheries in Tobago, and emphasize the need for tailored, gear-specific management strategies that support ecological sustainability while bolstering the cultural and economic resilience of fishing communities.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"82 ","pages":"Article 104045"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143179544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 0
Remote sensing and numerical modeling to assess the drought in Ichkeul Lake, a RAMSAR wetland and UNESCO biosphere reserve, under climate change
IF 2.1 4区 环境科学与生态学 Q3 ECOLOGY Pub Date : 2025-02-01 DOI: 10.1016/j.rsma.2024.103986
Cyrine Belhadj , Abdelaziz Sebei , Noamen Rebai , Ali Harzallah , Béchir Béjaoui
This research focuses on assessing the impact of climate change on the functioning of Lake Ichkeul, a RAMSAR wetland and UNESCO biosphere reserve in the southwestern Mediterranean region. The study investigates the impact of lagoon exchange through the Tinja channel, including the influence of tides, as well as the effects of river inflows and precipitation in controlling salinity and preventing drought occurrences in Ichkeul Lake using a numerical approach. Regarding the remote sensing analysis, findings show that the water body area of Ichkeul Lake has experienced a marked decline over recent years. Specifically, the area decreased from 31.4 km2 in 2016 to 29.7 km2 in 2022, highlighting ongoing environmental changes. A broader analysis spanning from 2000–2022 reveals a dramatic reduction, with the water body shrinking from 72.33 km2 in 2000 to 29.7 km2 in 2022, amounting to a substantial loss of 42.63 km² over two decades. As for the results of the numerical model, the results highlight the importance of tides in controlling the waterflow and salt into the lake. The flow of water exchanged across this communication ranges from −0.2 mm/day to + 0.2 mm/day, exhibiting variations corresponding to the different seasons. Furthermore, the simulations demonstrate the consequences of the closure of the Tinja channel. The numerical experiment shows that after 560 days of “isolation”, the Ichkeul lake experienced a total drought. The research findings underscore the critical significance of maintaining lagoon connectivity through the Tinja channel, considering both river input and tidal influence, to control salinity levels and prevent drought events in the Ichkeul Lake.
{"title":"Remote sensing and numerical modeling to assess the drought in Ichkeul Lake, a RAMSAR wetland and UNESCO biosphere reserve, under climate change","authors":"Cyrine Belhadj ,&nbsp;Abdelaziz Sebei ,&nbsp;Noamen Rebai ,&nbsp;Ali Harzallah ,&nbsp;Béchir Béjaoui","doi":"10.1016/j.rsma.2024.103986","DOIUrl":"10.1016/j.rsma.2024.103986","url":null,"abstract":"<div><div>This research focuses on assessing the impact of climate change on the functioning of Lake Ichkeul, a RAMSAR wetland and UNESCO biosphere reserve in the southwestern Mediterranean region. The study investigates the impact of lagoon exchange through the Tinja channel, including the influence of tides, as well as the effects of river inflows and precipitation in controlling salinity and preventing drought occurrences in Ichkeul Lake using a numerical approach. Regarding the remote sensing analysis, findings show that the water body area of Ichkeul Lake has experienced a marked decline over recent years. Specifically, the area decreased from 31.4 km<sup>2</sup> in 2016 to 29.7 km<sup>2</sup> in 2022, highlighting ongoing environmental changes. A broader analysis spanning from 2000–2022 reveals a dramatic reduction, with the water body shrinking from 72.33 km2 in 2000 to 29.7 km2 in 2022, amounting to a substantial loss of 42.63 km² over two decades. As for the results of the numerical model, the results highlight the importance of tides in controlling the waterflow and salt into the lake. The flow of water exchanged across this communication ranges from −0.2 mm/day to + 0.2 mm/day, exhibiting variations corresponding to the different seasons. Furthermore, the simulations demonstrate the consequences of the closure of the Tinja channel. The numerical experiment shows that after 560 days of “isolation”, the Ichkeul lake experienced a total drought. The research findings underscore the critical significance of maintaining lagoon connectivity through the Tinja channel, considering both river input and tidal influence, to control salinity levels and prevent drought events in the Ichkeul Lake.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"82 ","pages":"Article 103986"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177892","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}
引用次数: 0
Identifying changes in mangrove landscapes in the Philippines and Indonesia using remote sensing and community perceptions: Towards ecosystem services management
IF 2.1 4区 环境科学与生态学 Q3 ECOLOGY Pub Date : 2025-02-01 DOI: 10.1016/j.rsma.2025.104023
Yuki Sofue , Jay Mar D. Quevedo , Kevin Muhamad Lukman , Ryo Kohsaka
Mangrove ecosystems provide important services in mitigating global climate change while delivering various co-benefits at the local level. However, they are subjected to multiple anthropogenic and natural disturbances, leading to several investigations aimed at addressing these threats and/or restoring them. This study was conducted to develop site-specific scale land cover maps using remote sensing to monitor and quantify mangroves, alongside assessing community perceptions to identify the direct drivers of mangrove cover changes. Results showed that in Balangkayan, (Philippines), the mangrove cover increased by approximately 500 ha between 2014 and 2021, following a decline in 2013 due to Typhoon Haiyan. In Muaragembong (Indonesia), mangrove cover increased by about 176.13 ha between 2000 and 2022 after years of conversion to fish and shrimp ponds. Community perceptions in both sites revealed that natural disturbances, such as strong typhoons and coastal erosion, were the primary drivers of mangrove cover changes. The key findings of this study provide valuable insights into (1) mangrove cover changes over time, (2) proximate and underlying drivers of these changes, and (3) land use and land cover maps highlighting mangroves in less-explored sites. These local-scale observations offer global perspectives on the long-term effects of natural disasters and sustained mangrove restoration efforts on mangrove blue carbon.
{"title":"Identifying changes in mangrove landscapes in the Philippines and Indonesia using remote sensing and community perceptions: Towards ecosystem services management","authors":"Yuki Sofue ,&nbsp;Jay Mar D. Quevedo ,&nbsp;Kevin Muhamad Lukman ,&nbsp;Ryo Kohsaka","doi":"10.1016/j.rsma.2025.104023","DOIUrl":"10.1016/j.rsma.2025.104023","url":null,"abstract":"<div><div>Mangrove ecosystems provide important services in mitigating global climate change while delivering various co-benefits at the local level. However, they are subjected to multiple anthropogenic and natural disturbances, leading to several investigations aimed at addressing these threats and/or restoring them. This study was conducted to develop site-specific scale land cover maps using remote sensing to monitor and quantify mangroves, alongside assessing community perceptions to identify the direct drivers of mangrove cover changes. Results showed that in Balangkayan, (Philippines), the mangrove cover increased by approximately 500 ha between 2014 and 2021, following a decline in 2013 due to Typhoon Haiyan. In Muaragembong (Indonesia), mangrove cover increased by about 176.13 ha between 2000 and 2022 after years of conversion to fish and shrimp ponds. Community perceptions in both sites revealed that natural disturbances, such as strong typhoons and coastal erosion, were the primary drivers of mangrove cover changes. The key findings of this study provide valuable insights into (1) mangrove cover changes over time, (2) proximate and underlying drivers of these changes, and (3) land use and land cover maps highlighting mangroves in less-explored sites. These local-scale observations offer global perspectives on the long-term effects of natural disasters and sustained mangrove restoration efforts on mangrove blue carbon.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"82 ","pages":"Article 104023"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143178933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 0
New marine productivity empowers green development of the marine economy: Theoretical mechanism and empirical evidence
IF 2.1 4区 环境科学与生态学 Q3 ECOLOGY Pub Date : 2025-02-01 DOI: 10.1016/j.rsma.2025.104042
Wei Wang , Yao Wu , Xiaoxia He , Renhong Wu
New marine productivity is important in building a strong marine economy. Based on data from 11 provincial administrative regions in China's coastal areas from 2007 to 2021, we examine new marine productivity and green total factor productivity using a dynamic panel, mechanism test, and panel threshold model to determine the impact of new marine productivity on green development of the Chinese marine economy. We find that new marine productivity significantly promoted green development of the marine economy, and this promotional effect differed by region and level of new marine productivity. Three mechanisms were at work: promotion of technology, optimization of the industrial structure, and increased capital. The threshold effects of these latter two mechanisms influenced the impact of new marine productivity on green development of the Chinese marine economy. The higher the values for industrial structure and increased capital, the more obvious the positive spillover effect of new marine productivity on green development of the marine economy. The results of this study can support China in green development of its marine economy.
{"title":"New marine productivity empowers green development of the marine economy: Theoretical mechanism and empirical evidence","authors":"Wei Wang ,&nbsp;Yao Wu ,&nbsp;Xiaoxia He ,&nbsp;Renhong Wu","doi":"10.1016/j.rsma.2025.104042","DOIUrl":"10.1016/j.rsma.2025.104042","url":null,"abstract":"<div><div>New marine productivity is important in building a strong marine economy. Based on data from 11 provincial administrative regions in China's coastal areas from 2007 to 2021, we examine new marine productivity and green total factor productivity using a dynamic panel, mechanism test, and panel threshold model to determine the impact of new marine productivity on green development of the Chinese marine economy. We find that new marine productivity significantly promoted green development of the marine economy, and this promotional effect differed by region and level of new marine productivity. Three mechanisms were at work: promotion of technology, optimization of the industrial structure, and increased capital. The threshold effects of these latter two mechanisms influenced the impact of new marine productivity on green development of the Chinese marine economy. The higher the values for industrial structure and increased capital, the more obvious the positive spillover effect of new marine productivity on green development of the marine economy. The results of this study can support China in green development of its marine economy.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"82 ","pages":"Article 104042"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143179541","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}
引用次数: 0
Structuring effects of long-term eutrophication stress on macrobenthic assemblages in Xiangshan Bay, the East China Sea
IF 2.1 4区 环境科学与生态学 Q3 ECOLOGY Pub Date : 2025-02-01 DOI: 10.1016/j.rsma.2025.104053
Zhou Meng , Chen Song , Weiwei Zhou , Wanhong Han , Yushu Yang , Chong Zhang , Qingxi Han
Eutrophication has been identified as a global environmental issue to marine ecology. To investigate the effects of long-term eutrophication on the composition and dominant species of macrobenthos in Xiangshan Bay, macrobenthos and aquatic environmental factors were sampled and measured in August (wet season) every year from 2012 to 2022 in Xiangshan Bay. The results showed that the average content of dissolved inorganic nitrogen (DIN) in the surface seawater of Xiangshan Bay was (0.71 ± 0.17) mg/L, and the average content of dissolved inorganic phosphorus (DIP) was (0.037 ± 0.011) mg/L. Among all five stations collected, three of them indicated severe eutrophication, while other two stations displayed moderate organic pollution in their water quality. A total of 44 macrobenthic species were identified, including 7 phyla, 9 classes, and 35 families. Annelids and Mollusca emerged as the dominant macrobenthic taxa (31.82 % and 25.00 %, respectively). The annual average abundance was 218 ind.m−2, with Annelida Polychaeta displaying the highest abundance, accounting for 46.33 % of the total. Within the macrobenthic assemblages, 9 dominant species were determined, with Ophiura kinbergi and Sternaspis chinensis consistently dominating over the five-year period. Notably, the abundance of O. kinbergi exhibited a strong positive correlation with DIP and water quality index (A) (P < 0.01), as well as a significant positive correlation with eutrophication index (EI) and temperature (T) (P < 0.05). The comparative analysis with historical data revealed that pollution-tolerant macrobenthos had become prevalent, featuring smaller body sizes and greater adaptability to long-term eutrophication, particularly in the innermost bay area.
{"title":"Structuring effects of long-term eutrophication stress on macrobenthic assemblages in Xiangshan Bay, the East China Sea","authors":"Zhou Meng ,&nbsp;Chen Song ,&nbsp;Weiwei Zhou ,&nbsp;Wanhong Han ,&nbsp;Yushu Yang ,&nbsp;Chong Zhang ,&nbsp;Qingxi Han","doi":"10.1016/j.rsma.2025.104053","DOIUrl":"10.1016/j.rsma.2025.104053","url":null,"abstract":"<div><div>Eutrophication has been identified as a global environmental issue to marine ecology. To investigate the effects of long-term eutrophication on the composition and dominant species of macrobenthos in Xiangshan Bay, macrobenthos and aquatic environmental factors were sampled and measured in August (wet season) every year from 2012 to 2022 in Xiangshan Bay. The results showed that the average content of dissolved inorganic nitrogen (DIN) in the surface seawater of Xiangshan Bay was (0.71 ± 0.17) mg/L, and the average content of dissolved inorganic phosphorus (DIP) was (0.037 ± 0.011) mg/L. Among all five stations collected, three of them indicated severe eutrophication, while other two stations displayed moderate organic pollution in their water quality. A total of 44 macrobenthic species were identified, including 7 phyla, 9 classes, and 35 families. Annelids and Mollusca emerged as the dominant macrobenthic taxa (31.82 % and 25.00 %, respectively). The annual average abundance was 218 ind.m<sup>−2</sup>, with Annelida Polychaeta displaying the highest abundance, accounting for 46.33 % of the total. Within the macrobenthic assemblages, 9 dominant species were determined, with <em>Ophiura kinbergi</em> and <em>Sternaspis chinensis</em> consistently dominating over the five-year period. Notably, the abundance of <em>O. kinbergi</em> exhibited a strong positive correlation with DIP and water quality index (<em>A</em>) (<em>P</em> &lt; 0.01), as well as a significant positive correlation with eutrophication index (<em>EI</em>) and temperature (T) (<em>P</em> &lt; 0.05). The comparative analysis with historical data revealed that pollution-tolerant macrobenthos had become prevalent, featuring smaller body sizes and greater adaptability to long-term eutrophication, particularly in the innermost bay area.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"82 ","pages":"Article 104053"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143179545","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}
引用次数: 0
期刊
Regional Studies in Marine Science
全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1