Regional Studies in Marine Science最新文献

Reproductive cycle of Mytilus galloprovincialis (Lamarck, 1819) and Perna perna (Linné, 1758) for sustainable exploitation of natural mussel beds in Massa-Tifnit (On the Moroccan Atlantic Coast)

IF 2.1 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2025-03-04 DOI: 10.1016/j.rsma.2025.104103

Lamia Laaraj , Hafida Bergayou , Oum Keltoum Belhsen , Abdellatif Moukrim

The reproductive cycles of the mussel species Mytilus galloprovincialis and Perna perna, were studied at three sites on the Atlantic coast of southern Morocco (Sidi R′bat, Douira and Tifnit). Monitoring of temporal variations in the condition index, gonadal index and histological analyses of the gonadal maturity stages and sex ratio was conducted monthly, from January to December 2018.

The results indicate that the sex ratio favored males in both species, with a maximum ratio of 1.9: 0.53 for M. galloprovincialis at Tifnit; in contrast, the P. perna population at Tifnit presented a female-dominated ratio of 0.84:1.19. The spawning event for M. galloprovincialis occurred over three periods: two primary spawning periods in spring and autumn, and a secondary period in winter. P. perna spawns all year, with a primary spawning period from spring to autumn and several secondary spawning events. A small number of individuals (undifferentiated) were found in the sexual resting stage, recorded mainly in July and August. The variation in the condition index and gonadal index confirmed the periods of reproduction and the nutritive status of the bivalves.

The aim of this work is to contribute to a better understanding of mytiliculture potential by studying the reproductive cycle and recruitment of M. galloprovincialis and P. perna in their natural populations. Additionally, it supports the development of conservation and protection measures to sustain healthy populations and ensure sustainable fishing yields. Our results indicate that the mussel beds in this region possess several characteristics that make them suitable for aquaculture development.

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引用次数: 0

Carbon sequestration potential of Sonneratia apetala plantation forests in the Chakaria Sundarbans: Effects of stand age and structure

IF 2.1 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2025-03-02 DOI: 10.1016/j.rsma.2025.104104

Mohammad Ismail , Sujit Kumar Roy , Tanmoy Dey , Jayanta Kumar Basak , Mohammad Ashik Arman Chowdhury , Fayez Ullah , Sajib Ahmed

Coastal plantation ecosystems play a crucial role in combating global warming by serving as effective carbon sinks. Sonneratia apetala (Keora) is a fast-growing tree species that significantly influences local carbon sequestration rates, but still there is lack of knowledge about how this carbon sequestration rate changes with stand age and structure. So, we investigated how carbon stock changes across four different aged of S. apetala plantation forests (8, 16, 24, and 32 years) in the Chakaria Sundarbans. Twenty representative plots (20 m × 20 m) were selected from 4 different stand ages (8, 16, 24, and 32 years) using stratified random sampling design (SRSD) method. Soil organic carbon (SOC) content from 0 to 30 cm soil layers, aboveground biomass (AGB) and belowground biomass (BGB) were studied to calculate the total carbon stock (TCS). A positive correlation was observed between TCS and stand age. The TCS at the 8, 16, 24, and 32 years old plantation sites was 60.85, 109.73, 136.29, and 183.48 t ha⁻¹, respectively. The mean annual carbon accumulation rate (CAR) were 7.60, 6.86, 5.68, and 5.73 t ha⁻¹ year⁻¹ in these respective sites, indicated that the CAR significantly decreased with stand age. At the stand ages of 8, 16, and 24 years, soil organic carbon storage (SOCS) significantly outweighed total biomass carbon stock (TBCS), with percentages of 85.02 %, 60.68 %, and 55.65 % of TCS, respectively. However, at 32 years old stand, TBCS (54.77 %) exceeded SOCS (45.23 %). The TCS values were equivalent to 223.32, 402.71, 500.18, and 637.37 t ha⁻¹ CO₂ at 8, 16, 24, and 32 years old stands, respectively, revealed a significant potential for CO₂ sequestration. These findings can be used in the development of effective forest management strategies with restoring mangrove to maximize carbon storage potential in the southeastern coasts of Bangladesh, ultimately helping to reduce CO₂ gas emissions to combat adverse effect of climate change.

{"title":"Carbon sequestration potential of Sonneratia apetala plantation forests in the Chakaria Sundarbans: Effects of stand age and structure","authors":"Mohammad Ismail , Sujit Kumar Roy , Tanmoy Dey , Jayanta Kumar Basak , Mohammad Ashik Arman Chowdhury , Fayez Ullah , Sajib Ahmed","doi":"10.1016/j.rsma.2025.104104","DOIUrl":"10.1016/j.rsma.2025.104104","url":null,"abstract":"<div><div>Coastal plantation ecosystems play a crucial role in combating global warming by serving as effective carbon sinks. <em>Sonneratia apetala</em> (Keora) is a fast-growing tree species that significantly influences local carbon sequestration rates, but still there is lack of knowledge about how this carbon sequestration rate changes with stand age and structure. So, we investigated how carbon stock changes across four different aged of <em>S. apetala</em> plantation forests (8, 16, 24, and 32 years) in the Chakaria Sundarbans. Twenty representative plots (20 m × 20 m) were selected from 4 different stand ages (8, 16, 24, and 32 years) using stratified random sampling design (SRSD) method. Soil organic carbon (SOC) content from 0 to 30 cm soil layers, aboveground biomass (AGB) and belowground biomass (BGB) were studied to calculate the total carbon stock (TCS). A positive correlation was observed between TCS and stand age. The TCS at the 8, 16, 24, and 32 years old plantation sites was 60.85, 109.73, 136.29, and 183.48 t ha<sup>−1</sup>, respectively. The mean annual carbon accumulation rate (CAR) were 7.60, 6.86, 5.68, and 5.73 t ha<sup>−1</sup> year<sup>−1</sup> in these respective sites, indicated that the CAR significantly decreased with stand age. At the stand ages of 8, 16, and 24 years, soil organic carbon storage (SOCS) significantly outweighed total biomass carbon stock (TBCS), with percentages of 85.02 %, 60.68 %, and 55.65 % of TCS, respectively. However, at 32 years old stand, TBCS (54.77 %) exceeded SOCS (45.23 %). The TCS values were equivalent to 223.32, 402.71, 500.18, and 637.37 t ha<sup>−1</sup> CO<sub>2</sub> at 8, 16, 24, and 32 years old stands, respectively, revealed a significant potential for CO<sub>2</sub> sequestration. These findings can be used in the development of effective forest management strategies with restoring mangrove to maximize carbon storage potential in the southeastern coasts of Bangladesh, ultimately helping to reduce CO<sub>2</sub> gas emissions to combat adverse effect of climate change.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"84 ","pages":"Article 104104"},"PeriodicalIF":2.1,"publicationDate":"2025-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143547924","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

Evolution of effort and the efficacy of input controls in controlling fishing mortality in the Icelandic female lumpsucker (Cyclopterus lumpus) gillnet fishery

IF 2.1 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2025-02-27 DOI: 10.1016/j.rsma.2025.104105

James Kennedy

The female lumpsucker (Cyclopterus lumpus) gillnet fishery in Iceland has been managed exclusively through input controls for several decades. The present study assessed how different components of total effort have changed from 1985 to 2024 and how different components of effort influenced an estimate of relative fishing mortality (F_proxy). F_proxy could be predicted from a combination of the number of boats participating in fishery, the average number of gillnets hauled per day, the average number of fishing days utilised in the season and an index of under/over estimation of the biomass index. Time period was also included in the model as there was a change in the catch per unit effort (CPUE) at a given level of biomass index from 2004 to 2005 when limits on the number of fishing days pre boat was introduced. The number of boats with a licence to participate in the fishery currently exceeds the capacity of the fishery, thus if the number of boats were to rise to historical highs, then F_proxy would rise above the management target. Total catch is primarily managed through the number of consecutive days a boat can fish for, however, the number of boats has a greater impact on fishing mortality than the number of fishing days. We present a model which can predict F_proxy for a given level of effort, but this requires the number of boats which will participate in the fishery to be known. In terms of maintaining fishing mortality within sustainable limits, the effort system could be considered to be successful. However, the management of this fishery is now changing to an output-controlled fishery, but the experience from this fishery serves as a good model for other fisheries where management systems have a limited capacity to control catch.

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引用次数: 0

Offshore artificial islands and shoreline change in Southern Hainan Island: Development and challenges

IF 2.1 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2025-02-27 DOI: 10.1016/j.rsma.2025.104096

Zixian Yang , Zhanrui Xu , Xiaodong Zhang

Intensifying coastal development has significantly altered shoreline dynamics, highlighting the urgent need to comprehend the intricate change processes and impact mechanisms involved. This study examines the multifaceted influences of four offshore artificial islands as well as other coastal engineering projects on shoreline dynamics in southern Hainan Island, China. It employs a transect-focused approach, integrating 864 Landsat and Sentinel images from 1986 to 2023 and statistical techniques. The precision of annual shoreline position derived from satellite images improved to 0.7–1.2 m. The shoreline changes were categorized into stable (8 %), eroding (36 %), and artificially altered (56 %). The study reveals that offshore artificial islands can effectively protect the shorelines they directly face from erosion and foster accretion, but also cause erosion on adjacent shorelines and significantly change the coastal landscape, leading to complex environmental outcomes. The findings underscore the dual nature of offshore artificial islands' impact on coastal environments, emphasizing the importance of sustainable coastal engineering and the need for thorough environmental assessments to avoid or mitigate potential negative effects on shoreline stability and landscapes, particularly in tourist cities known for their fine sandy beaches and picturesque coastal scenery, such as Sanya City.

{"title":"Offshore artificial islands and shoreline change in Southern Hainan Island: Development and challenges","authors":"Zixian Yang , Zhanrui Xu , Xiaodong Zhang","doi":"10.1016/j.rsma.2025.104096","DOIUrl":"10.1016/j.rsma.2025.104096","url":null,"abstract":"<div><div>Intensifying coastal development has significantly altered shoreline dynamics, highlighting the urgent need to comprehend the intricate change processes and impact mechanisms involved. This study examines the multifaceted influences of four offshore artificial islands as well as other coastal engineering projects on shoreline dynamics in southern Hainan Island, China. It employs a transect-focused approach, integrating 864 Landsat and Sentinel images from 1986 to 2023 and statistical techniques. The precision of annual shoreline position derived from satellite images improved to 0.7–1.2 m. The shoreline changes were categorized into stable (8 %), eroding (36 %), and artificially altered (56 %). The study reveals that offshore artificial islands can effectively protect the shorelines they directly face from erosion and foster accretion, but also cause erosion on adjacent shorelines and significantly change the coastal landscape, leading to complex environmental outcomes. The findings underscore the dual nature of offshore artificial islands' impact on coastal environments, emphasizing the importance of sustainable coastal engineering and the need for thorough environmental assessments to avoid or mitigate potential negative effects on shoreline stability and landscapes, particularly in tourist cities known for their fine sandy beaches and picturesque coastal scenery, such as Sanya City.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"83 ","pages":"Article 104096"},"PeriodicalIF":2.1,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143520082","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

Diversity, distribution and ecological dynamics of Chaetognatha: A comprehensive review with emphasis on the Indian Ocean Chaetognatha的多样性、分布和生态动态：以印度洋为重点的全面回顾

IF 2.1 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2025-02-26 DOI: 10.1016/j.rsma.2025.104085

AJ Naiji Josephine , Manguesh U. Gauns

The phylum Chaetognatha represents a group of bilaterally symmetrical, transparent-bodied, arrow-shaped organisms (also called arrow worms) that are ecologically sensitive. The members of the phylum are well known for their importance in serving as pollution and hydrographical indicators. Despite contributing 25 % of the global mesozooplankton biomass and serving as valuable indicators of climate change, studies on phylum Chaetognatha lags behind many other planktonic groups, particularly in the Indian Ocean. Presently, the Chaetognatha research is mostly focused on the fossilised members due to their significance as the earliest known predators. In contrast, the present study offers a comprehensive review of published works on the distribution, migration behaviour and ecological interactions of the extant members of this carnivorous phylum in the Indian Ocean. Various hydrographical conditions of the Indian Ocean like upwelling, oxygen minimum zone (OMZ), monsoon winds, hydrothermal vents, and their impact on the organisms are addressed. This review is the pioneer attempt to consolidate all the aspects of Chaetognatha ecology in the Indian Ocean.

{"title":"Diversity, distribution and ecological dynamics of Chaetognatha: A comprehensive review with emphasis on the Indian Ocean","authors":"AJ Naiji Josephine , Manguesh U. Gauns","doi":"10.1016/j.rsma.2025.104085","DOIUrl":"10.1016/j.rsma.2025.104085","url":null,"abstract":"<div><div>The phylum Chaetognatha represents a group of bilaterally symmetrical, transparent-bodied, arrow-shaped organisms (also called arrow worms) that are ecologically sensitive. The members of the phylum are well known for their importance in serving as pollution and hydrographical indicators. Despite contributing 25 % of the global mesozooplankton biomass and serving as valuable indicators of climate change, studies on phylum Chaetognatha lags behind many other planktonic groups, particularly in the Indian Ocean. Presently, the Chaetognatha research is mostly focused on the fossilised members due to their significance as the earliest known predators. In contrast, the present study offers a comprehensive review of published works on the distribution, migration behaviour and ecological interactions of the extant members of this carnivorous phylum in the Indian Ocean. Various hydrographical conditions of the Indian Ocean like upwelling, oxygen minimum zone (OMZ), monsoon winds, hydrothermal vents, and their impact on the organisms are addressed. This review is the pioneer attempt to consolidate all the aspects of Chaetognatha ecology in the Indian Ocean.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"83 ","pages":"Article 104085"},"PeriodicalIF":2.1,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487259","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

Unveiling the ecological wealth: Species diversity, conservation impact, and carbon sequestration in mangrove ecosystems

IF 2.1 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2025-02-25 DOI: 10.1016/j.rsma.2025.104083

R.D.C. Sandaruwan , H.S. Badullage , I.J.J.U.N. Perera , H.P.S. Jayapala , K.A.S. Udayanga , B.K.A. Bellanthudawa

Mangroves are one of the most productive ecosystems in the world. However, mangroves are considered as sensitive ecosystems, which are vulnerable to diverse array of anthropogenic and natural disturbances. Hence, acknowledging the dynamics of mangrove vegetation in different environmental conditions is a timely need for sustainable conservation of mangroves. Consequently, we conducted this study to assess the species composition, structural characteristics, biomass, and carbon stock of mangrove species in Kandakuliya, Kalpitiya. We selected three sites using complete random block design sampling, from each mangrove patch, a 10 m x 10 m sample plots were established. The study was conducted between June 2023 to October 2023 with monthly sampling. We found eight species of mangroves among sites and the highest total abundance was recorded at site 2 (46 individuals). In terms of species composition, majority of individuals (54) belonged to Pemphis acidula species. According to diversity indices, the highest Shannon-Wiener's diversity index (H′) value was recorded in site 1 (1.68), and the highest Pielou's evenness index (J) (0.93) and the highest Simpson's index of diversity (0.82) were also recorded in site 1. As per the biomass analysis, the total biomass value was 355.3 Mg/ha, with 199.01 Mg/ha above-ground and 156.29 Mg/ha below-ground. Further, study showed that the total carbon stock ranged from 1.38 to 43.96 Mg C/ha among the recorded eight mangrove species. The highest importance value index was observed in the P. acidula species, occupying 45.11 % of the total population. Notably, Avicennia marina (43.96 Mg C/ha) and Excoecaria agallocha (39.74 Mg C/ha) were exhibited substantial carbon storage capacity. The CO₂ equivalent of the ecosystem carbon stock (16.67 t CO₂e) indicates that, despite high levels of anthropogenic activities leading to fragmented distribution, these ecosystems remain effective in long-term carbon sequestration, provided they are not further disturbed. This study findings demonstrates that the area can store significant amounts of carbon, emphasizing the importance of sustainable management and conservation to enhance its capacity for climate change mitigation.

{"title":"Unveiling the ecological wealth: Species diversity, conservation impact, and carbon sequestration in mangrove ecosystems","authors":"R.D.C. Sandaruwan , H.S. Badullage , I.J.J.U.N. Perera , H.P.S. Jayapala , K.A.S. Udayanga , B.K.A. Bellanthudawa","doi":"10.1016/j.rsma.2025.104083","DOIUrl":"10.1016/j.rsma.2025.104083","url":null,"abstract":"<div><div>Mangroves are one of the most productive ecosystems in the world. However, mangroves are considered as sensitive ecosystems, which are vulnerable to diverse array of anthropogenic and natural disturbances. Hence, acknowledging the dynamics of mangrove vegetation in different environmental conditions is a timely need for sustainable conservation of mangroves. Consequently, we conducted this study to assess the species composition, structural characteristics, biomass, and carbon stock of mangrove species in Kandakuliya, Kalpitiya. We selected three sites using complete random block design sampling, from each mangrove patch, a 10 m x 10 m sample plots were established. The study was conducted between June 2023 to October 2023 with monthly sampling. We found eight species of mangroves among sites and the highest total abundance was recorded at site 2 (46 individuals). In terms of species composition, majority of individuals (54) belonged to <em>Pemphis acidula</em> species. According to diversity indices, the highest Shannon-Wiener's diversity index (H′) value was recorded in site 1 (1.68), and the highest Pielou's evenness index (J) (0.93) and the highest Simpson's index of diversity (0.82) were also recorded in site 1. As per the biomass analysis, the total biomass value was 355.3 Mg/ha, with 199.01 Mg/ha above-ground and 156.29 Mg/ha below-ground. Further, study showed that the total carbon stock ranged from 1.38 to 43.96 Mg C/ha among the recorded eight mangrove species. The highest importance value index was observed in the <em>P. acidula</em> species, occupying 45.11 % of the total population. Notably, <em>Avicennia marina</em> (43.96 Mg C/ha) and <em>Excoecaria agallocha</em> (39.74 Mg C/ha) were exhibited substantial carbon storage capacity. The CO<sub>2</sub> equivalent of the ecosystem carbon stock (16.67 t CO<sub>2</sub>e) indicates that, despite high levels of anthropogenic activities leading to fragmented distribution, these ecosystems remain effective in long-term carbon sequestration, provided they are not further disturbed. This study findings demonstrates that the area can store significant amounts of carbon, emphasizing the importance of sustainable management and conservation to enhance its capacity for climate change mitigation.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"84 ","pages":"Article 104083"},"PeriodicalIF":2.1,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143547920","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

Sea-level change in Eastern Mediterranean, Aegean and Black seas analyzed at subregional scale of six CORDEX domains

IF 2.1 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2025-02-25 DOI: 10.1016/j.rsma.2025.104099

Pelin Uzun, Emre N. Otay

This study examines climate change effects on storm surge residual (SS), tidal elevation (TE) and total water level (TWL) on a subregional scale at the intersection of six CORDEX domains including the Black (including the Sea of Azov), Marmara, Aegean, and Eastern Mediterranean seas. It compares the four seas through a rigorous statistical analysis of TWL and their components, SS and TE, for historical, mid-century and end-century periods until 2100. The statistical analysis involves examining percentages, correlation coefficients, trendlines, probability distributions, extreme values, and epoch-mean and epoch-max tidal indicators. Country-by-country analyses of TWL and SS are conducted along the coasts of countries bordering these seas. This study is the first to examine future TWL, SS, and TE, focusing on this subregion using a high temporal and spatial resolution dataset. Our findings reveal the Black Sea’s heightened vulnerability, primarily due to SS. The maximum SS in the Black Sea increases at a rate of 22.7 mm/year and 11.6 mm/year in the mid-century and end-century periods, respectively. The Marmara Sea is characterized by the lowest incidences of TE, SS, and TWL, suggesting a lesser degree of susceptibility. The Aegean and Eastern Mediterranean seas exhibit similar impacts from SS and TE. The most critical coasts are the Azov Sea coasts (Ukrainian and Russian coasts), the northwestern coasts of the Black Sea (Ukrainian coast) and the northern coasts of the Aegean Sea (along the Greek mainland) with 4 m, 2 m and 1.5 m of 100-year return period TWL values, respectively. The Egyptian coast of the Mediterranean Sea is also critical due to its high maximum SS (1.2 m) in the end-century period. This study’s datasets, sourced from the Copernicus Climate Change Service (C3S), underscore the necessity for robust coastal management strategies to mitigate the impending challenges posed by sea-level change.

{"title":"Sea-level change in Eastern Mediterranean, Aegean and Black seas analyzed at subregional scale of six CORDEX domains","authors":"Pelin Uzun, Emre N. Otay","doi":"10.1016/j.rsma.2025.104099","DOIUrl":"10.1016/j.rsma.2025.104099","url":null,"abstract":"<div><div>This study examines climate change effects on storm surge residual (SS), tidal elevation (TE) and total water level (TWL) on a subregional scale at the intersection of six CORDEX domains including the Black (including the Sea of Azov), Marmara, Aegean, and Eastern Mediterranean seas. It compares the four seas through a rigorous statistical analysis of TWL and their components, SS and TE, for historical, mid-century and end-century periods until 2100. The statistical analysis involves examining percentages, correlation coefficients, trendlines, probability distributions, extreme values, and epoch-mean and epoch-max tidal indicators. Country-by-country analyses of TWL and SS are conducted along the coasts of countries bordering these seas. This study is the first to examine future TWL, SS, and TE, focusing on this subregion using a high temporal and spatial resolution dataset. Our findings reveal the Black Sea’s heightened vulnerability, primarily due to SS. The maximum SS in the Black Sea increases at a rate of 22.7 mm/year and 11.6 mm/year in the mid-century and end-century periods, respectively. The Marmara Sea is characterized by the lowest incidences of TE, SS, and TWL, suggesting a lesser degree of susceptibility. The Aegean and Eastern Mediterranean seas exhibit similar impacts from SS and TE. The most critical coasts are the Azov Sea coasts (Ukrainian and Russian coasts), the northwestern coasts of the Black Sea (Ukrainian coast) and the northern coasts of the Aegean Sea (along the Greek mainland) with 4 m, 2 m and 1.5 m of 100-year return period TWL values, respectively. The Egyptian coast of the Mediterranean Sea is also critical due to its high maximum SS (1.2 m) in the end-century period. This study’s datasets, sourced from the Copernicus Climate Change Service (C3S), underscore the necessity for robust coastal management strategies to mitigate the impending challenges posed by sea-level change.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"83 ","pages":"Article 104099"},"PeriodicalIF":2.1,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487262","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

New geochemical and mineralogical data of Ogasawara phosphorites (northwestern Pacific) 小笠原磷酸盐岩（西北太平洋）的新地球化学和矿物学数据

IF 2.1 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2025-02-24 DOI: 10.1016/j.rsma.2025.104101

V.V. Sattarova , Yu.G. Volokhin , I.S. Kirichenko , N.V. Zarubina

A mineralogical and geochemical study of five phosphorite samples from the Ogasawara submarine plateau (Northwest Pacific) was performed using optical and scanning electron microscopy (SEM), X-ray diffraction analysis, and inductively coupled plasma spectrometry equipped with microanalysis systems. The total rare-earth elements (REE) content varied from 94 to 183 ppm, with an average of 145 ppm. Their distribution, distinct negative Ce anomalies and redox indices indicate the primary precipitation from oxygenated seawater under relatively oxic marine conditions during early diagenesis. From the point of view of economic potential, the studied phosphorites can be considered as a valuable source of phosphate flour with a low content of radioactive elements in the mineral composition.

引用次数: 0

Development of Artificial fish bait incorporated with Surimi and fatty acid bioattractant derived from seafood processing wastes for longline fishing

IF 2.1 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2025-02-22 DOI: 10.1016/j.rsma.2025.104090

Soosaiantony Emiema , Thangaraji Ravikumar , Krishnamoorthy Elavarasan , Neethirajan Neethiselvan , Vijaykumar Renuka , Fathiraja Parthiban , Karunanithi Masilan , Ulaganathan Arisekar

This study explored the possibilities of developing an artificial fish bait using a fish surimi gel matrix and attractants derived from shrimp, grouper, and tuna processing wastes. A wet rendering method was used to extract bioattractant from the wastes, which were characterized by their fatty acid using GC-MS. It resulted in a total of 37 fatty acids present in the different bioattractant. Among them, a high unsaturated degree of fatty acids (85.88 %) was found in the bioattractant derived from grouper, followed by tuna (64.62 %) and shrimp (62.35 %). A total of four different experimental baits were developed, including a surimi gel bait (SGB) as control, surimi gel bait with grouper bioattractant (SGB-GB), surimi gel bait with tuna bioattractant (SGB-TB), and surimi gel bait with shrimp bioattractant (SGB-SB) at three different level of concentrations viz., 1 %, 3 %, and 5 %. The developed baits were subjected to gel strength (GS), water holding capacity (WHC), expressible moisture content (EMC), fat leaching (FL), seawater stability, and attractability tests to standardize the ideal bait for commercial fishing. Fourier-Transom Infrared spectroscopy (FTIR) and Atomic Force Microscopy (AFM) were used to describe its molecular and microstructural features. AFM results displayed that the SGB-GB 5 % had a smooth and homogenous gel matrix with a low Ra value (19.11 nm), while the control bait (SGB) had a coarse and disorganized gel matrix with the highest Ra value (36.77 nm). In terms of fat leaching (86.34 %), seawater stability (81.69 %), attractability (28/30), gel strength (153.46 g/cm), EMC (13.52 %), and WHC (78 %), 5 % SGB-GB bait was found to be an ideal bait for commercial fishing.

{"title":"Development of Artificial fish bait incorporated with Surimi and fatty acid bioattractant derived from seafood processing wastes for longline fishing","authors":"Soosaiantony Emiema , Thangaraji Ravikumar , Krishnamoorthy Elavarasan , Neethirajan Neethiselvan , Vijaykumar Renuka , Fathiraja Parthiban , Karunanithi Masilan , Ulaganathan Arisekar","doi":"10.1016/j.rsma.2025.104090","DOIUrl":"10.1016/j.rsma.2025.104090","url":null,"abstract":"<div><div>This study explored the possibilities of developing an artificial fish bait using a fish surimi gel matrix and attractants derived from shrimp, grouper, and tuna processing wastes. A wet rendering method was used to extract bioattractant from the wastes, which were characterized by their fatty acid using GC-MS. It resulted in a total of 37 fatty acids present in the different bioattractant. Among them, a high unsaturated degree of fatty acids (85.88 %) was found in the bioattractant derived from grouper, followed by tuna (64.62 %) and shrimp (62.35 %). A total of four different experimental baits were developed, including a surimi gel bait (SGB) as control, surimi gel bait with grouper bioattractant (SGB-GB), surimi gel bait with tuna bioattractant (SGB-TB), and surimi gel bait with shrimp bioattractant (SGB-SB) at three different level of concentrations viz., 1 %, 3 %, and 5 %. The developed baits were subjected to gel strength (GS), water holding capacity (WHC), expressible moisture content (EMC), fat leaching (FL), seawater stability, and attractability tests to standardize the ideal bait for commercial fishing. Fourier-Transom Infrared spectroscopy (FTIR) and Atomic Force Microscopy (AFM) were used to describe its molecular and microstructural features. AFM results displayed that the SGB-GB 5 % had a smooth and homogenous gel matrix with a low Ra value (19.11 nm), while the control bait (SGB) had a coarse and disorganized gel matrix with the highest Ra value (36.77 nm). In terms of fat leaching (86.34 %), seawater stability (81.69 %), attractability (28/30), gel strength (153.46 g/cm), EMC (13.52 %), and WHC (78 %), 5 % SGB-GB bait was found to be an ideal bait for commercial fishing.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"83 ","pages":"Article 104090"},"PeriodicalIF":2.1,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143508265","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

Seasonal shifts in microplastics: Uncovering Goa's marine pollution patterns

IF 2.1 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2025-02-22 DOI: 10.1016/j.rsma.2025.104089

Veda V. Manerikar , Vinod Mandrekar , Vishnu S. Nadkarni , Manojkumar S. Kulkarni , Sanjeev C. Ghadi

This study systematically examines the spatiotemporal distribution of microplastic particles across Goa's 160 km coastal ecosystem during the pre-monsoon, monsoon, and post-monsoon seasons. It delivers the first dataset on pollution levels and indices in Goa's coastal and estuarine areas across these three seasons, addressing a critical knowledge gap in understanding seasonal variations in the region. Estuaries and coastal areas were subjected to both quantitative and qualitative assessments of microplastic particles, focusing on the foraging of microplastics by Mugil cephalus and Rastrelliger kangurta. Microplastic concentrations varied between 25 ± 4.76 and 273.5 ± 11.26 per liter or kilogram of the water and sediment samples. During the monsoon season, the microplastics were found higher in estuarine and coastal water compared to sediment, likely due to increased turbulence. In contrast, post-monsoon sediment in coastal areas had a higher count than water, suggesting settling after turbulent periods. Analysis showed that fibers were the most prevalent, followed by fragments, pellets, and microbeads, with the Coefficient of Microplastic Impact values reaching 0.7 in estuaries like Chapora and Sal water during the post-monsoon season. During this season, the Pollution Hazard Index indicated high risk (Category 4) at coastal areas such as Baga, Colva, and estuaries like Mandovi, and Sal. The Pollution Load Index ranged from 1.00 in Sal water post-monsoon to 3.30 in Mandovi sediment. Dark-colored particles, mainly black, blue, and green nylon fiber, constituted the majority of microplastic particles in the gut contents of Rastrelliger kangurta and Mugil cephalus. Fourier transform infrared and Raman spectroscopy identified essential polymers, including polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyethylene terephthalate, and nylon. Initiated during the COVID-19 lockdown, this study holds a unique significance in assessing microplastic prevalence in the marine ecosystem of Goa.

{"title":"Seasonal shifts in microplastics: Uncovering Goa's marine pollution patterns","authors":"Veda V. Manerikar , Vinod Mandrekar , Vishnu S. Nadkarni , Manojkumar S. Kulkarni , Sanjeev C. Ghadi","doi":"10.1016/j.rsma.2025.104089","DOIUrl":"10.1016/j.rsma.2025.104089","url":null,"abstract":"<div><div>This study systematically examines the spatiotemporal distribution of microplastic particles across Goa's 160 km coastal ecosystem during the pre-monsoon, monsoon, and post-monsoon seasons. It delivers the first dataset on pollution levels and indices in Goa's coastal and estuarine areas across these three seasons, addressing a critical knowledge gap in understanding seasonal variations in the region. Estuaries and coastal areas were subjected to both quantitative and qualitative assessments of microplastic particles, focusing on the foraging of microplastics by <em>Mugil cephalus</em> and <em>Rastrelliger kangurta</em>. Microplastic concentrations varied between 25 ± 4.76 and 273.5 ± 11.26 per liter or kilogram of the water and sediment samples. During the monsoon season, the microplastics were found higher in estuarine and coastal water compared to sediment, likely due to increased turbulence. In contrast, post-monsoon sediment in coastal areas had a higher count than water, suggesting settling after turbulent periods. Analysis showed that fibers were the most prevalent, followed by fragments, pellets, and microbeads, with the Coefficient of Microplastic Impact values reaching 0.7 in estuaries like Chapora and Sal water during the post-monsoon season. During this season, the Pollution Hazard Index indicated high risk (Category 4) at coastal areas such as Baga, Colva, and estuaries like Mandovi, and Sal. The Pollution Load Index ranged from 1.00 in Sal water post-monsoon to 3.30 in Mandovi sediment. Dark-colored particles, mainly black, blue, and green nylon fiber, constituted the majority of microplastic particles in the gut contents of <em>Rastrelliger kangurta</em> and <em>Mugil cephalus</em>. Fourier transform infrared and Raman spectroscopy identified essential polymers, including polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyethylene terephthalate, and nylon. Initiated during the COVID-19 lockdown, this study holds a unique significance in assessing microplastic prevalence in the marine ecosystem of Goa.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"83 ","pages":"Article 104089"},"PeriodicalIF":2.1,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143520083","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