Journal of Sea Research最新文献

{"title":"Seagrasses in coastal wetlands of the Algarve region (southern Portugal): Past and present distribution and extent","authors":"Paula Ito,&nbsp;Márcio Martins,&nbsp;Simon von Sachsen-Coburg und Gotha,&nbsp;Rui Santos,&nbsp;Carmen B. de los Santos","doi":"10.1016/j.seares.2025.102580","DOIUrl":"10.1016/j.seares.2025.102580","url":null,"abstract":"<div><div>The global biodiversity crisis urges to update the distribution maps of natural habitats, especially those that are in rapid decline and play a key role in ecosystem functioning, such as seagrasses. In Portugal, seagrass meadows have declined substantially since the 1980s and are considered one of the most endangered marine habitats. Here we aimed to 1) compile records on the distribution and area extent of seagrass meadows in the four wetlands of the Algarve region (southern Portugal) with historical occurrence of seagrasses, based on a systematic review, and 2) update the distribution maps and area extent of seagrass meadows in this region using a combination of manual and machine learning mapping techniques. The systematic review showed a general lack of data on the distribution of seagrass meadows in the Algarve, with patchy information at different times and using incomparable mapping techniques. Based on the updated mapping from 2019 to 2023, well-developed seagrass meadows were only found in the Ria Formosa lagoon and the Guadiana estuary. In the Ria de Alvor, some sparce scattered patches of seagrass were observed in the intertidal zone, while no seagrass was found in the Arade estuary. The total extent of seagrass in the Algarve region was estimated at 1231 ha, with nearly all (99 %) occurring in the Ria Formosa, where 85 % was intertidal. Although assessing temporal trends remains challenging due to methodological differences and data limitations, the estimated 20 % decline and ongoing pressures on seagrass meadows in Algarve wetlands underscore the urgent need for continuous, standardized monitoring of their distribution, extent, and condition.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"205 ","pages":"Article 102580"},"PeriodicalIF":2.1,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143683066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Beach morphology, textural variation and erosion along the south-eastern coastal segment in Cox's Bazar-Teknaf, Bangladesh","authors":"Md. Bazlar Rashid ,&nbsp;Md. Rubel Sheikh ,&nbsp;A.J.M. Emdadul Haque ,&nbsp;Mohammad Abdul Aziz Patwary ,&nbsp;Md. Ahosan Habib ,&nbsp;Md Shamsuzzaman ,&nbsp;Abdullah Al Mamun ,&nbsp;Mohammad Elius Hossain","doi":"10.1016/j.seares.2025.102579","DOIUrl":"10.1016/j.seares.2025.102579","url":null,"abstract":"<div><div>Coastal erosion is one of the key concerns on the longest beach on the earth along the southeastern Bengal coast in the Cox's Bazar-Teknaf area of Bangladesh. The objectives of the current attempt are to delineate the erosion-accretion scenario, cause, and consequence of erosion of the coast, textural variations of beach sediments and depositional conditions. These phenomena were illustrated through the interpretation of satellite imagery, characterizing beach morphology, sediment texture, tidal amplitudes, etc. The grain size of the sandy beach samples was explained through standard deviation, mean, kurtosis and skewness. Investigation implies that from 1989 to 2024, 1085 and 284 ha of land at a rate of 31 and 8 ha per year have degraded and accreted, respectively. Surge, cyclones, waves, current, human interference, sea level and climate fluctuations, beach morphology and high tidal amplitude are the prime influential factors for beach erosion at concern level. The matrices are mainly composed of well to moderately well sorted finer sand with silt. The result suggests that low energy tidal conditions prevailed along the coastline of the area. The findings would be advantageous for coastal scientists, researchers, academia, planners, policy makers, investors, other related stakeholders, etc. to understand the coastal procedure, beach morphology, sedimentation processes and cycles, and influence of southwest monsoon on the beach. It would also be useful for baseline information on granulometry, sedimentary environments of beach sediments, future beach nourishment scheme on the eroding shorelines, and for sustainable coastal zone management.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"205 ","pages":"Article 102579"},"PeriodicalIF":2.1,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143683065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of the applicability of 28S rRNA and COI genes in the molecular identification of planktonic copepods from the Northwest Pacific","authors":"Dandan Wu ,&nbsp;Yuefan Wang ,&nbsp;Jinchen Li ,&nbsp;Bilin Liu ,&nbsp;Gaohua Ji","doi":"10.1016/j.seares.2025.102581","DOIUrl":"10.1016/j.seares.2025.102581","url":null,"abstract":"<div><div>Copepods are a crucial component of marine ecosystems, serving as a primary food source for numerous marine species and playing a significant role in aquatic food webs. Traditional morphological identification methods are often challenging due to the small size and subtle morphological differences among species. Molecular identification techniques have emerged as powerful tools for species discrimination. This study evaluates the effectiveness of the nuclear 28S ribosomal RNA (28S rRNA) and mitochondrial cytochrome <em>c</em> oxidase I (COI) genes in identifying copepod species from the Northwest Pacific. Zooplankton samples were collected using vertical net tows from 32 stations across an area of 1,320,000 km² in the Northwest Pacific. We analyzed sequences and conducted phylogenetic analyses on planktonic copepods. We obtained 110 valid 28S rRNA sequences from 45 species, representing 2 orders, 15 families, and 29 genera, and 62 valid COI sequences from 30 species. Notably, this study provides the first 28S rRNA and COI sequence data for <em>Euchaeta tenuis</em>, <em>Euchirella indica</em> and <em>Scolecithricella vittata.</em> Our findings indicate that the average interspecific genetic distances for 28S rRNA and COI are approximately 93.0 and 53.0 times higher, respectively, than the average intraspecific genetic distances, meeting the requirements for DNA barcoding. While COI-based barcodes exhibited distinct barcode gaps, 28S rRNA showed a 7 % overlap between intra- and interspecific genetic distances; however, Jeffries-Matusita (J-M) statistical test confirmed a significant gap for 28S rRNA. Compared to COI, 28S rRNA is more effective in delineating genera and higher taxonomic levels such as families revealed by phylogenetic analyses. Additionally, 28S rRNA demonstrated higher amplification success rates and comparable species-level identification performance to COI.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"205 ","pages":"Article 102581"},"PeriodicalIF":2.1,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143704547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Resilience solution to solve prisoner's dilemma in port shore power usage: The value of government subsidies on port","authors":"Zhening Ye ,&nbsp;Jie Wang ,&nbsp;Junjin Wang","doi":"10.1016/j.seares.2025.102578","DOIUrl":"10.1016/j.seares.2025.102578","url":null,"abstract":"<div><div>As environmental pollution increases and pollutants emitted by ships pose a threat to the environment and health, port shore power has become an effective means of reducing pollution from ships. However, shipping companies are affected by fuel prices and may ignore environmental issues and jeopardize social welfare in pursuit of their own interests. Therefore, government intervention is particularly important, especially through subsidies to solve the conflict between competition among shipping companies and environmental pollution. This study develops a three-tier supply chain model incorporating governmental authorities, port operators, and dual shipping companies to examine shore power adoption strategies. Through Nash equilibrium analysis, we investigate the efficiency of shore power utilization under both subsidized and non-subsidized scenarios in order to find the resilience solution for the relevant stakeholders. The findings reveal that in the absence of government intervention, shipping companies' equilibrium strategies are primarily determined by the relative costs of conventional fuel and shore power, leading to potential Prisoner's Dilemma situations. The introduction of government subsidies enhances the likelihood of achieving stable equilibrium for both shipping companies while mitigating the Prisoner's Dilemma effect. The study provides references of resilience solution for related fields and policy recommendations for parties in the port and shipping supply chain.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"205 ","pages":"Article 102578"},"PeriodicalIF":2.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143683063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effect of new quality productivity on port sustainability: Evidence from China","authors":"Jiayun Nie,&nbsp;Jia Shen ,&nbsp;Yuting Chen","doi":"10.1016/j.seares.2025.102575","DOIUrl":"10.1016/j.seares.2025.102575","url":null,"abstract":"<div><div>The development of new quality productivity (NQP) provides fresh impetus and potential for the sustainable development of ports. Utilizing panel data from 44 coastal ports and their respective municipal administrative regions spanning from 2010 to 2021, this study empirically analyzes the impact of NQP on port sustainability and further examines the underlying mechanisms and heterogeneity of its effects. The findings reveal that an increase in NQP significantly enhances port sustainability. The results of mechanism tests indicate that heightened NQP fosters port sustainability by adjusting industrial structures and elevating urban green innovation levels, with the public's digital attention playing a positive moderating role. Heterogeneity analysis demonstrates that the promotional effect of NQP on port sustainability is stronger in city samples characterized by better business environments, superior soft environments, lower business costs, and those dominated by the secondary industry. This study elucidates the significance of NQP in fostering the sustainable development of ports, thereby providing policymakers with a robust foundation for optimizing port development strategies and enhancing sustainable capacity.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"204 ","pages":"Article 102575"},"PeriodicalIF":2.1,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143580343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Short- and long-term tidal level forecasting: A novel hybrid TCN + LSTM framework","authors":"Abdulrazak H. Almaliki ,&nbsp;Afaq Khattak","doi":"10.1016/j.seares.2025.102577","DOIUrl":"10.1016/j.seares.2025.102577","url":null,"abstract":"<div><div>Tidal level forecasting is essential for maritime safety, coastal management, and infrastructure planning. This study proposes a hybrid framework combining Temporal Convolutional Network (TCN) and Long Short-Term Memory (LSTM) model to predict tidal levels across short- and long-term horizons. The TCN excels at capturing temporal patterns, while the LSTM effectively models sequential dependencies, facilitating accurate forecasting of tidal fluctuations. Covariance Matrix Adaptation Evolution Strategy (CMA-ES) was used for hyperparameter tuning of both TCN and LSTM component of hybrid framework. Historical tidal data from Ras Tanura (2012−2021) was utilized for training and evaluation. The analysis revealed that the hybrid TCN + LSTM framework optimized via CMA-ES outperformed other deep learning models, including standalone LSTM, GRU, and CNN, demonstrating enhanced accuracy and reliability across various forecasting horizons. For short-term predictions (T + 5 and T + 10 days), it achieved MAE values of 0.073 and 0.081, with MAPE values of 7.43 % and 9.15 %, respectively. For longer-term horizons (T + 30 and T + 60 days), it maintained accuracy with MAE values of 0.050 and 0.054 and corresponding MAPE values of 5.39 % and 4.93 %. The study demonstrates the potential of the hybrid TCN + LSTM framework for reliable tidal level forecasting, supporting better planning and decision-making in coastal and maritime applications.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"204 ","pages":"Article 102577"},"PeriodicalIF":2.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143549888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Understanding the shift in bacterial community structure in response to antibiotic pollution and rise in antibiotic resistant genes within Dapeng Cove sea, China","authors":"Feng Yan ,&nbsp;Zhiguang Niu","doi":"10.1016/j.seares.2025.102576","DOIUrl":"10.1016/j.seares.2025.102576","url":null,"abstract":"<div><div>Antibiotic pollution in marine environments poses a growing threat to ecosystem health and biodiversity. This study evaluated the shift in bacterial community structure in response to antibiotic pollution and rise in antibiotic resistant genes within the ecologically significant Dapeng Cove, Southeast China. Utilizing molecular analysis and bioinformatics, the study examined bacterial community structures, antibiotic concentrations, and the distribution of antibiotic resistance genes (ARGs) across 5 sites (A, B, C, D and E) within the Dapeng Cove sea, China. The findings revealed significant variations in bacterial diversity and ARG concentrations among sampling sites, with elevated antibiotic pollution at sites D and E correlating with reduced alpha diversity and dominance of resistant taxa such as <em>Umbonibacter species</em>. In contrast, site B exhibited lower antibiotic levels and higher microbial diversity, suggesting the resilience of less impacted ecosystems. ARGs, including intl1, sul1, and tetA, were most prevalent in heavily polluted sites, reflecting the role of antibiotic contamination in promoting horizontal gene transfer and resistance proliferation. Exposure to antibiotic pollution e further disrupted coral-associated bacterial communities, highlighting the vulnerability of marine ecosystems antibiotic pollution. This study provides critical insights into the interplay between antibiotic pollution, microbial ecology, and coral health, offering a foundation for policies addressing the environmental impacts of pharmaceutical contaminants.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"204 ","pages":"Article 102576"},"PeriodicalIF":2.1,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143580344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Photo-id as an alternative to monitor marine turtles in the Gulf of Venezuela","authors":"María Gabriela Sandoval ,&nbsp;Héctor Barrios-Garrido","doi":"10.1016/j.seares.2025.102574","DOIUrl":"10.1016/j.seares.2025.102574","url":null,"abstract":"<div><div>Conservation management programs have used diverse methods to monitor populations of threatened species that vary in effectiveness, duration, and costs; making its implementation a challenge. The present study was carried out to test the use of photo-identification as an economical and efficient alternative for marine turtle monitoring in the Gulf of Venezuela. The implementation of this protocol is possible due to the unique and unrepeatable facial scales pattern of individuals in the marine turtles. We created a database of photo-identifiable profiles available from records of turtles captured, tagged, and released in the Gulf of Venezuela from 2000 to 2017 (<em>n</em> = 118). Likewise, we used two photo-matching software (I³S Pattern and Nature Pattern Match) to optimize the process of compatibility of individuals and we evaluated their efficiency in comparison with the non-assisted manual method (“by human eye” or “by naked eye”). We found that I³S Pattern was more effective during the matching process than NPM (90 % and 65 % accuracy respectively), while the manual method was much more accurate than the software. However, the former method is impractical when working with large databases. Our results indicate that I³S Pattern represents the most efficient software of image matching by reducing the time needed and simplifying the manual “by human eye” analysis. We recommend incorporating more photos in the database in order to verify the effectiveness of both studied software, and regularly to corroborate the results generated by the software assessed on this research using the “human eye” manual method.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"204 ","pages":"Article 102574"},"PeriodicalIF":2.1,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143512682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The brown alga Rugulopteryx okamurae: Insights into epifaunal diversity across marginal populations in Gran Canaria","authors":"Mónica Martín Jiménez,&nbsp;Rodrigo Riera","doi":"10.1016/j.seares.2025.102571","DOIUrl":"10.1016/j.seares.2025.102571","url":null,"abstract":"<div><div>Biological invasions pose significant threats to biodiversity, primarily through the depletion of natural resources and the disruption of local ecosystems. Our study focuses on <em>Rugulopteryx okamurae</em> (E. Y. Dawson) I·K. Hwang, W.J. Lee, and H.S. Kim, an invasive alga proliferating in the Macaronesia and Mediterranean regions. This research examines the epifaunal assemblages associated with <em>R. okamurae</em> across eastern and northeastern zones in Gran Canaria, Canary Islands. A total of 11,398 individuals from 63 species within five taxonomic groups were collected, with Arthropoda dominating the samples (88.68 % of the overall abundance), particularly the amphipods <em>Apohyale perieri</em> and <em>A. stebbingi</em>. Significant differences in species richness and individual abundance were observed between populations from San Cristóbal, Jinámar and Ojos de Garza. The central populations exhibited the highest species richness, while the northern populations showed the lowest. Multivariate analyses revealed distinct community compositions between the edge and central populations, underscoring the invasive alga's capacity to support diverse and abundant epifaunal assemblages. Moreover, <em>R. okamurae</em> demonstrated remarkable dominance in the study area, achieving total coverage of up to 100 % at certain sampling sites. This extensive coverage highlights the alga's ability to sustain a rich and varied epifaunal community, characterized by both species abundance and high biodiversity. The findings emphasize the need for targeted conservation and management strategies to mitigate the spread of <em>R. okamurae</em> and protect local biodiversity from further disruption.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"204 ","pages":"Article 102571"},"PeriodicalIF":2.1,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143421517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Long-term biogeochemical variations in the southern South China Sea and adjacent seas: A model data analysis","authors":"Winfred Marshal ,&nbsp;Nur Hidayah Roseli ,&nbsp;Roswati Md Amin ,&nbsp;Mohd Fadzil Bin Mohd Akhir","doi":"10.1016/j.seares.2025.102573","DOIUrl":"10.1016/j.seares.2025.102573","url":null,"abstract":"<div><div>The southern portion of the South China Sea (SCS), which constitutes the largest semi-enclosed marginal sea in Southeast Asia, is currently undergoing unusual surface warming, which may significantly impact its marine ecosystems. This study examines the long-term variations of biogeochemistry in the southern SCS and its adjacent seas from 1993 to 2020, using data from the Copernicus Marine Environment Monitoring Service (CMEMS) model to better understand the implications of these warming trends on nutrient dynamics and overall marine health. Analysis of interannual variations highlights a strong relationship between sea surface temperature (SST) anomalies and the occurrence of El Niño-Southern Oscillation and Indian Ocean Dipole events, leading to significant alterations in biogeochemistry in the southern SCS. These findings emphasize the sensitivity of biogeochemistry to climatic variability. Over the study period, a region-wide increasing SST trend (0.2 °C per decade) indicates the influence of climate change, while surface Chlorophyll concentration and Phytoplankton biomass show decreasing trends, suggesting potential shifts in primary productivity. Additionally, surface Dissolved Oxygen and pH levels have significantly declined, pointing to broader impacts on ocean health. These observed declining trends in biogeochemical variables are particularly pronounced in the southeastern Vietnam, East Coast of Peninsular Malaysia, and Java Sea regions, which are primarily driven by significant changes in SST and related wind patterns. The weakening of summer southwesterly winds and winter northeasterly winds, evidenced by linear trends in wind stress, has reduced nutrient supply through upwelling and decreased ocean heat loss, respectively. This disruption exacerbates surface ocean warming and limits the replenishment of essential nutrients, leading to diminished primary productivity and altering marine ecosystem dynamics. This study provides valuable insights into present biogeochemical trends under climate change, forming a crucial basis for future projection studies in this region.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"204 ","pages":"Article 102573"},"PeriodicalIF":2.1,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143421516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}