Regional Studies in Marine Science最新文献_第3页

The stock enhancement for blackhead seabream (Acanthopagrus schlegelii): Insights from whole-genome resequencing

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-03-18 DOI: 10.1016/j.rsma.2025.104142

Xiaoyang Wang , Yanyan Yang , Hu Zhang , Yunrong Shi , Anle Xu , Xiumei Zhang , Na Song

{"title":"The stock enhancement for blackhead seabream (Acanthopagrus schlegelii): Insights from whole-genome resequencing","authors":"Xiaoyang Wang , Yanyan Yang , Hu Zhang , Yunrong Shi , Anle Xu , Xiumei Zhang , Na Song","doi":"10.1016/j.rsma.2025.104142","DOIUrl":"10.1016/j.rsma.2025.104142","url":null,"abstract":"<div><div>Stock enhancement plays a crucial role in fishery management and has been proven successful in rebuilding depleted fishery resources. However, as an important species for stock enhancement in China, the genetic effects of the release process on blackhead seabream remain poorly known. Here, we report the whole-genome resequencing of 144 blackhead seabream individuals and explored population genetic effects. Our results indicated that the fixation index among the seven populations was low (<em>F</em>st, 0.0006067–0.01491), and they showed similar decay distance and nucleotide diversity. Paternity analyses revealed that 2 out of the 20 fish recaptured were closely related to the released populations, suggesting that they may be part of the released individuals. However, the analyses revealed that 50 % of the breeders are related. Therefore, it highlights the importance of using numerous native specimens as breeders in management and the necessity to enhance genetic management of stock enhancement.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"85 ","pages":"Article 104142"},"PeriodicalIF":2.1,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686321","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 data on distribution and ecology of the mushroom sponge Artemisina transiens Topsent, 1890 (Porifera) in the Atlantic Iberian margin

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-03-17 DOI: 10.1016/j.rsma.2025.104124

Regina C. Neto , Diego Carreira-Flores , Francisco Ramil , Pedro T. Gomes

{"title":"New data on distribution and ecology of the mushroom sponge Artemisina transiens Topsent, 1890 (Porifera) in the Atlantic Iberian margin","authors":"Regina C. Neto , Diego Carreira-Flores , Francisco Ramil , Pedro T. Gomes","doi":"10.1016/j.rsma.2025.104124","DOIUrl":"10.1016/j.rsma.2025.104124","url":null,"abstract":"<div><div><em>Artemisina transiens</em> (Topsent 1890), a mushroom-shaped marine sponge, is poorly documented in the literature. To address this knowledge gap, we conducted a study in northern Portugal, Viana do Castelo (41°50' N; 8°57' W and 41°36' N; 8°57' W), from May 2022 to September 2023, focusing on the distribution, and abundance of mushroom sponge <em>A. transiens</em>, as well as documenting the main species associated to this sponge. A comprehensive literature review established a foundational baseline and identified key habitat preferences. Remote-operated vehicles (ROVs) were deployed for underwater surveys, capturing new insights into the species' presence across varied depths and substrates and revealing significant occurrences in previously unexplored areas. The results showed that <em>A. transiens</em> distribution is influenced by depth and substrate slope, with a preference for low slopes/flat surfaces and depths below 40 m. Detailed spatial analysis using Local Moran's I statistic indicated a non-random distribution of <em>A. transiens</em>, emphasizing its clustering in specific areas likely influenced by local environmental conditions. This study enhances the understanding of mesophotic ecosystems, highlighting the need for targeted conservation efforts and further research to comprehend the complex interactions within these biodiverse but understudied marine environments.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"84 ","pages":"Article 104124"},"PeriodicalIF":2.1,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143637276","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

Food for thought: Marine pollution's impact on One Health and food security in African SIDS

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-03-17 DOI: 10.1016/j.rsma.2025.104136

Thomas Maes, Dave Messing

{"title":"Food for thought: Marine pollution's impact on One Health and food security in African SIDS","authors":"Thomas Maes, Dave Messing","doi":"10.1016/j.rsma.2025.104136","DOIUrl":"10.1016/j.rsma.2025.104136","url":null,"abstract":"<div><div>Aquaculture and fisheries are essential for food security and livelihoods in coastal communities and contribute, though modestly, to the GDP of African nations, particularly Small Island Developing States (SIDS). Marine pollution poses significant social, economic, and environmental challenges to these industries. The One Health approach, which recognises the links between marine pollution, health, and food security, provides a comprehensive framework for addressing these issues. To mitigate these challenges, country-specific strategies should focus on strengthening legal frameworks for pollution control, promoting environmental stewardship, enhancing regulation enforcement, improving waste management, and fostering stakeholder engagement. Key technological innovations include marking fishing gear to prevent ghost fishing, implementing integrated multi-trophic aquaculture and aquaponics to reduce eutrophication, and improving fish disease management while preventing aquaculture escapes. Addressing antimicrobial resistance (AMR) is also crucial for long-term sustainability. Additionally, enhancing multisectoral coordination, regional cooperation, and integrating traditional knowledge with modern practices can help safeguard both communities and ecosystems in these vulnerable regions.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"85 ","pages":"Article 104136"},"PeriodicalIF":2.1,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686295","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

Characteristics of meiofaunal communities inhabiting waters surrounding marine research stations based in the Yellow Sea and East China Sea

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-03-17 DOI: 10.1016/j.rsma.2025.104137

Teawook Kang , Min Gyu Jung , Dongsung Kim , Je Hyeok Oh , Ayoung Shin , Chul Woong Oh

{"title":"Characteristics of meiofaunal communities inhabiting waters surrounding marine research stations based in the Yellow Sea and East China Sea","authors":"Teawook Kang , Min Gyu Jung , Dongsung Kim , Je Hyeok Oh , Ayoung Shin , Chul Woong Oh","doi":"10.1016/j.rsma.2025.104137","DOIUrl":"10.1016/j.rsma.2025.104137","url":null,"abstract":"<div><div>This study aimed to analyze meiofaunal communities near three marine research stations (MRSs) installed in the Yellow Sea to identify the characteristics of meiofaunal communities in subtidal zones. The study was conducted using samples collected near Ieodo MRS (I-MRS), Gageocho MRS (G-MRS), and Socheongcho MRS (S-MRS) located on the southern, central, and northern parts of the Yellow Sea, respectively. The average distribution density of meiofauna was 118.9 ± 11.1 Inds./10 cm<sup>2</sup> in 2016 and 237.4 ± 33.7 Inds./10 cm<sup>2</sup> in 2020 near I-MRS; 65.9 ± 12.5 Inds./10 cm<sup>2</sup> in 2017 near G-MRS; and 196.9 ± 32.8 Inds./10 cm<sup>2</sup> in 2018 and 392.5 ± 41.8 Inds./10 cm<sup>2</sup> in 2019 near S-MRS. The range of these abundances is similar to those observed in the subtidal zones of the Yellow Sea. The results showed that the distribution density of meiofauna was high near the S-MRS but low near the G-MRS, which had fine-grained sediments and higher TOC content than the other MRSs. The mean number of meiofaunal taxa observed was 6.9 in 2016 and 8.9 in 2020 near I-MRS; 5.4 in 2017 near G-MRS; 8.8 in 2018 and 9.5 in 2019 near S-MRS. The G-MRS region, characterized by fine sediment, had the highest proportion of nematodes, the lowest abundance of harpacticoids among all MRS regions. Also the analysis of meiofaunal abundance by size revealed that there are higher and lower proportions of small-sized and large-sized meiofaunal individuals than the other MRS areas. A cluster analysis confirmed that the meiofaunal communities form distinct groups based on the locations of the MRSs. Correlation analysis between sediment environmental factors and distribution density of meiofauna revealed a significant negative correlation between sediment grain size and TOC content.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"85 ","pages":"Article 104137"},"PeriodicalIF":2.1,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143705139","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

Estimation of plastic waste inputs from the Kura-Aras Basin into the Caspian Sea

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-03-16 DOI: 10.1016/j.rsma.2025.104126

Seyedeh Maryam Seyed Mousavi , Hassan Taghipour , Vahid Nourani , Hassan Aslani , Mehdi Ghayebzadeh , Reza Ghasemzadeh

{"title":"Estimation of plastic waste inputs from the Kura-Aras Basin into the Caspian Sea","authors":"Seyedeh Maryam Seyed Mousavi , Hassan Taghipour , Vahid Nourani , Hassan Aslani , Mehdi Ghayebzadeh , Reza Ghasemzadeh","doi":"10.1016/j.rsma.2025.104126","DOIUrl":"10.1016/j.rsma.2025.104126","url":null,"abstract":"<div><div>Rivers could play a crucial role in moving plastic debris of all sizes and contributing to the growing environmental problem of marine plastic pollution. Most recent studies that have estimated the global contribution of plastic from rivers to the oceans or seas focus on coastal areas or major polluting rivers and ignore smaller rivers and individual basins. The present study investigated the solid waste generation rate, management, and final disposal methods in the Kura-Aras basin (KAB). It estimated the amount of plastic waste entering the Caspian Sea through this basin. The results showed that the condition of solid waste management in the KAB countries is unsatisfactory, and ∼91 % of the plastic waste generation in the KAB is mismanaged plastic waste (MPW), weighing 381,653 tons year<sup>−1</sup>. The KAB carried 12,439 tons of MPW into the Caspian Sea each year, with the lowest amount being 3909 tons and the highest being 23,038 tons (by sensitivity analysis, ± 50 % of the base value). This amount equals 1–6 % of the annual mismanaged plastic waste in the KAB. According to our research, river basins must implement efficient strategies for managing and reducing plastic pollution.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"85 ","pages":"Article 104126"},"PeriodicalIF":2.1,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686292","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

Coastal vegetation response to land uplift inflicted sea level drop in the North Andaman Islands, India

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-03-16 DOI: 10.1016/j.rsma.2025.104134

Anoop Raj Singh , Vedagiri Thirumurugan , Namita Joshi , Chinnasamy Ramesh , Nehru Prabakaran

{"title":"Coastal vegetation response to land uplift inflicted sea level drop in the North Andaman Islands, India","authors":"Anoop Raj Singh , Vedagiri Thirumurugan , Namita Joshi , Chinnasamy Ramesh , Nehru Prabakaran","doi":"10.1016/j.rsma.2025.104134","DOIUrl":"10.1016/j.rsma.2025.104134","url":null,"abstract":"<div><div>The permanent retrieval of tidal water due to coastal uplift post the 2004 tsunami caused a drop in mean sea level significantly degrading the mangroves of North Andaman and Mayabunder region (135 km<sup>2</sup>). Meanwhile, the exposed reef bed in the uplifted sites provided an opportunity for the seaward expansion of mangroves, while the degraded mangroves provided an opportunity for the expansion of terrestrial forests. This study examines vegetation succession in three distinct vegetation categories formed due to geomorphological changes: New Terrestrial Forest (NTF) where terrestrial vegetation now occupies former mangrove areas, Old Mangrove Forest (OMF) with altered tidal regimes but retained mangrove status, and New Mangrove Forest (NMF) growing on former reef beds. A total of 257 plots (10 ×10 m<sup>2</sup>) across 27 sites (nine/vegetation type) were established to study the vegetation community. NTF sites exhibited the highest species richness (n = 73 species, including nine mangroves), while OMF and NMF sites hold 18 and 10 mangroves respectively. The tree density/plot was lowest in NTF (4.5 ± 0.81), followed by NMF (7.4 ± 1.01), and was highest in OMF (13.2 ± 1.21) sites. <em>Ficus rumphii</em> (15.2 %) was most abundant at NTF; while <em>Avicennia marina</em> (35.07 %) was abundant at NMF and <em>Rhizophora apiculata</em> (39.88 %) was abundant at OMF. A significant difference (p < 0.001) was observed in the species diversity and composition among the vegetation types (OMF, NMF, and NTF), and layers (tree, sapling, and seedling). This study provides a crucial baseline on vegetation succession in the altered coastal ecosystem, underscoring the need for long-term monitoring to assess species competition and community dynamics in these unique successional forests.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"85 ","pages":"Article 104134"},"PeriodicalIF":2.1,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686290","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

Mangrove phenological shifts over eco-climatic stressors in the Gulf of Kutch using Sentinel-1&2 time series data

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-03-15 DOI: 10.1016/j.rsma.2025.104133

Laxmi Kant Sharma, Sonal Sharma, Kariya Ishita Bhaveshkumar

{"title":"Mangrove phenological shifts over eco-climatic stressors in the Gulf of Kutch using Sentinel-1&2 time series data","authors":"Laxmi Kant Sharma, Sonal Sharma, Kariya Ishita Bhaveshkumar","doi":"10.1016/j.rsma.2025.104133","DOIUrl":"10.1016/j.rsma.2025.104133","url":null,"abstract":"<div><div>Mangroves, blue carbon forest, play a vital role in the environment by protecting the coast, stabilizing the environment, and managing the ecosystem. Analysis of mangrove phenology is required to understand the dynamics of mangrove ecosystems and for restoration measures. Remote sensing technology has been widely employed to monitor vegetation phenology, yet there is a dearth of research addressing the remotely sensed phenology of mangrove forests in coastal Gujarat, India. In this study, we investigated the mangrove phenology dynamics in the Gulf of Kutch region of Gujarat using satellite-derived Sentinel-1&2 time series during 2017–2022, compared the ability of vegetation indices to influence mangrove phenology, and later explored the impact of environmental stressors on mangrove phenology. Eco-climatic stressors show a negative correlation between mean sea level. temperature, precipitation, relative humidity, wind speed, with the increasing impact but for salinity which also shows negative correlation with phenological events, its impact weakens. Shifts were observed in phenological metrics over our study period, highlighting the influence of environmental factors on mangrove dynamics. The findings can enhance our knowledge of the phenological attributes of mangrove forests, which further provides vision to formulate policies for the restoration and sustainable management of the mangrove ecosystem.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"85 ","pages":"Article 104133"},"PeriodicalIF":2.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645091","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

Robust and precise drowning target localization under dual-parameters uncertainty

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-03-15 DOI: 10.1016/j.rsma.2025.104131

Jiangfeng Xian , Junling Ma , Xinqiang Chen , Huafeng Wu , Xiaojun Mei , Yuanyuan Zhang , Weijun Wang

{"title":"Robust and precise drowning target localization under dual-parameters uncertainty","authors":"Jiangfeng Xian , Junling Ma , Xinqiang Chen , Huafeng Wu , Xiaojun Mei , Yuanyuan Zhang , Weijun Wang","doi":"10.1016/j.rsma.2025.104131","DOIUrl":"10.1016/j.rsma.2025.104131","url":null,"abstract":"<div><div>To fulfil sustainable and healthy development of the ocean, this paper studied received signal strength (RSS)-based three-dimensional (3D) drowning target localization that simultaneously considering absorption effect, uncertain transmission power (UTP), and time-varying path loss exponent (PLE) for underwater search and rescue missions induced by the frequent occurrence of maritime accidents. Firstly, the original non-linear and non-convex localization problem is transformed into an alternating non-negative constrained least-squares (ANCLS) framework by applying the Taylor first-order expansion and certain approximations. Subsequently, a Robust and Precise Drowning Target Localization (RPDTL) algorithm is then proposed to solve the optimal solution with unknown multi-parameters. The coarse phase of localization is based upon the Golub-Kahan bi-diagonalized least square minimal residual (LSMR) algorithm. Nevertheless, LSMR usually only converges quickly to the local optimal solution. Consequently, an innovative solution method, namely the Broyden-Fletcher-Goldfarb-Shanno (BFGS) trust domain method, is involved in the fine localization phase, where the approximation of the Hessian Matrix is updated through the BFGS formula that significantly reduces the computational cost and saves the computational time. The underwater target location, UTP and PLE are refined simultaneously in the iteration, in which the rough solution acquired using Golub-Kahan bi-diagonalized LSMR is adopted as the initiation. Furthermore, to demonstrate the superiority of RPDTL, we have analyzed the computational complexity and derived the Cramér-Rao lower bound (CRLB). Finally, compared with the selected benchmark algorithms, the simulation results validate that the RPDTL achieves optimal localization accuracy over variable scenarios, which indicates that RPDTL can effectively support the realization of the long-term goal of sustainable ocean health.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"85 ","pages":"Article 104131"},"PeriodicalIF":2.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686289","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

How to improve the performance of port adaptation investment? An independent cascade evolution model for port adaptation investment

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-03-14 DOI: 10.1016/j.rsma.2025.104128

Liang Wang, Haoxin Peng

{"title":"How to improve the performance of port adaptation investment? An independent cascade evolution model for port adaptation investment","authors":"Liang Wang, Haoxin Peng","doi":"10.1016/j.rsma.2025.104128","DOIUrl":"10.1016/j.rsma.2025.104128","url":null,"abstract":"<div><div>Extreme weather events driven by climate change highlight the urgent need for port adaptation investments, which are often under-prioritized in favor of enhancing operational capacity. This study proposes an independent cascade evolution model aimed at optimizing the performance of port adaptation investments. Utilizing the independent cascade evolution model based on evolutionary game, the study investigates the national propagation of such investments. Data collection provides insights into the current performance levels and trends in port adaptation investment. The analysis results indicate that integrating disaster and environmental adaptation investments significantly increases national participation. Adaptation investment performance exhibits a \"barrel effect,\" where the overall performance is limited by its weakest component. There is a positive correlation between initial investment size and performance, which eventually turns negative as investments grow. Moderate competition among ports enhances investment performance. Based on these findings, the study recommends several strategies to enhance port adaptation investment performance: prioritizing the stability of environmental adaptations, addressing the \"barrel effect\" by ensuring balanced investment across all necessary adaptation areas and recognizing and adapting to different stages of investment development. This study provides valuable guidance for port adaptation investments and supports national policy-making efforts to address the impacts of climate change on port infrastructure.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"85 ","pages":"Article 104128"},"PeriodicalIF":2.1,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645092","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

Long-term increasing water quality trends in Hakodate Bay, Hokkaido, driven by meteorological factors

IF 2.1 4区环境科学与生态学

Regional Studies in Marine Science Pub Date : 2025-03-13 DOI: 10.1016/j.rsma.2025.104123

Chalvin Putra Rura, Akihide Kasai

{"title":"Long-term increasing water quality trends in Hakodate Bay, Hokkaido, driven by meteorological factors","authors":"Chalvin Putra Rura, Akihide Kasai","doi":"10.1016/j.rsma.2025.104123","DOIUrl":"10.1016/j.rsma.2025.104123","url":null,"abstract":"<div><div>Ensuring optimal water quality in Hakodate Bay by curbing eutrophication has been pivotal since Japan's water pollution control law was implemented in 1970. However, recent ecological disturbances, such as <em>Karenia mikimotoi</em> blooms since 2015, have raised water quality concerns. This study employed exploratory data analysis and dynamic factor analysis (DFA) to analyze water quality parameter trends—such as chemical oxygen demand (COD), total nitrogen (TN), total phosphorus (TP)—across seven stations in Hakodate Bay from 1977–2023. Climatic variables, including air temperature, total daily precipitation, wind speed, and solar radiation were used as explanatory variables. Higher COD, TN, TP, and lower salinity were observed inside Hakodate Port waters. High correlations among salinity, COD, TN, and TP at station 3 suggest the influence of river inflow because of its location near the Kunebetsu River. Increasing COD trends were observed in all stations (Mann–Kendall τ = 0.208–0.325, <em>p</em> < 0.001). The DFA model for COD shares a single trend with two explanatory variables: average daily air temperature and wind speed. The model for TP had a common trend with three climate covariates. However, the model only explained < 30 % of the variation in TP. The best DFA model for TN, which included a common trend and two covariates similar with COD explained only < 10 % of the variability in TN. Our findings suggest that climate change may undermine efforts to reduce organic matter pollution in Hakodate Bay, while ruling out meteorological factors as the primary drivers of nutrient dynamics.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"84 ","pages":"Article 104123"},"PeriodicalIF":2.1,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143637277","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