Journal of Marine Systems最新文献

{"title":"A warmer climate and an increased Yellow River runoff weakened the barrier effect of ocean fronts on the transport of terrestrial suspended sediment and nutrients in the Chinese Bohai Sea","authors":"Yan Liu ,&nbsp;Guangtong Yang ,&nbsp;Xiaoyue Fu ,&nbsp;Guanghao Li ,&nbsp;Liangkun Nie ,&nbsp;Buli Cui ,&nbsp;Xiang Yu ,&nbsp;Chao Zhan ,&nbsp;Longsheng Wang","doi":"10.1016/j.jmarsys.2025.104125","DOIUrl":"10.1016/j.jmarsys.2025.104125","url":null,"abstract":"<div><div>The barrier effect of ocean fronts (OFs) was generally acknowledged but rarely quantified. This study aimed to quantify this barrier effect in the Chinese Bohai Sea under climate changes. Firstly, with the help of GOCI-based remotely sensed retrieval and ancillary data products, we verified this barrier effect based on the contrast of contribution rate of different hydrodynamic factors (temperature, salinity, precipitation, runoff and wind speed) on suspended sediment concentration (SSC) and fluorescence line height (FLH). Secondly, sliding window threshold algorithm (SWTA) was used to obtain the areas of OFs, suspended sediment fronts (SSFs), and fluorescence fronts (FFs) from 2011 to 2020. Thirdly, we obtained outer boundaries of OFs based on morphological opening filter, and to generate closed areas involving coastline. At last, SSC and FLH in the whole Bohai Sea were divided into three categories: high-value, transition, and low-value. Percentages of three categories involved in the closed areas were further used to quantify the barrier effect. The results showed that the barrier effect was weakened due to: 1) the area of OFs decreased by 3.17 × 10³ km², while that of FFs increased by 9.67 × 10³ km²; 2) centroid of SSFs moved away from the Yellow River estuary, while that of FFs moved offshore; 3) percentages of transition, and low-value categories of SSC and FLH involved in the closed areas increased (41.45 %, 37.58 %). The warmer SST and the increased Yellow River runoff jointly led to the weakened barrier effect of OFs in the Chinese Bohai sea from 2011 to 2020.</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"252 ","pages":"Article 104125"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144921424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unveiling the coastal diversity of benthic fauna of the Cantabrian Sea: Harbours and intertidal natural areas under the lens of invasive species","authors":"Ricardo López-Alonso ,&nbsp;Emma Shorter-Rodríguez ,&nbsp;Esteban Pascual-Parra ,&nbsp;Claudia González-Toral ,&nbsp;Pablo Pereda-Bezanilla ,&nbsp;María Díez-Muñoz ,&nbsp;Verónica Soto-López ,&nbsp;Deva Menéndez-Teleña ,&nbsp;Iris Carrera-Rodríguez ,&nbsp;Jesús Ángel García-Maza ,&nbsp;Eduardo Cires ,&nbsp;Andrés Arias","doi":"10.1016/j.jmarsys.2025.104145","DOIUrl":"10.1016/j.jmarsys.2025.104145","url":null,"abstract":"<div><div>Biodiversity loss is one of nowadays best-known environmental problems. Biological invasions are acknowledged as one of the main causes of biodiversity loss. The globalisation phenomenon and subsequent spreading of invasive species cause damage to native ecosystems and harm the economy and health of the invaded areas. Harbours and marinas are among the main pathways that allow invasive species to enter new ranges. These anthropogenic structures provide a protected environment that allows the settlement of alien species. One of the questions that arises when dealing with this issue, is whether these invasive species can disperse and affect adjacent coastal areas. This work aims to characterise the diversity of exotic and invasive benthic fauna from four marinas of the northern Iberian Peninsula (Cantabrian Sea, Bay of Biscay) and eight neighbouring intertidal natural ecosystems, emphasising the introduction vectors. A great difference in terms of diversity was observed in each area, being more abundant in ports. In addition, according to our data, intertidal shores might be more resistant to biological invasions than harbours, which are highly degraded habitats. Most of the exotic species in ports have arrived through ballast water or biofouling, due to the high maritime traffic in the Cantabrian Sea. A total of 399 species were found. The dominant phylum was Mollusca (98 species), followed by Annelida (95 species) and Arthropoda with (88 species). According to their status, 26 species were catalogued as invasive, two as cryptogenic, six as exotic and 365 as native. Most invasive species belong to the phyla Bryozoa and Chordata. An Indicator Species Analysis identified two species indicatives of natural intertidal shores and 66 species of harbours. Additionally, PERMANOVA tests revealed significant differences in species composition among sampling sites. Information about exotic species can help increase knowledge regarding biological invasions and subsequently prevent them. It is also crucial to comprehend the biology of the species involved in order to predict their ecological and economic impacts.</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"252 ","pages":"Article 104145"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145424636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Extreme underestimation of satellite-derived chlorophyll-a concentration in the northwestern Weddell Sea during a phytoplankton bloom and its reasons","authors":"Pavel A. Salyuk ,&nbsp;Dmitry I. Glukhovets ,&nbsp;Alexander A. Latushkin ,&nbsp;Olga Yu. Kalinina ,&nbsp;Elena A. Shtraikhert ,&nbsp;Philipp V. Sapozhnikov ,&nbsp;Sergey A. Mosharov ,&nbsp;Igor E. Stepochkin ,&nbsp;Nadezhda A. Lipinskaya ,&nbsp;Maxim I. Gorbov ,&nbsp;Svetlana K. Klimenko","doi":"10.1016/j.jmarsys.2025.104159","DOIUrl":"10.1016/j.jmarsys.2025.104159","url":null,"abstract":"<div><div>The data obtained from satellite and expedition measurements during the 87th cruise of the R/V Akademik Mstislav Keldysh revealed a significant discrepancy in chlorophyll-<em>a</em> (Chl-<em>a</em>) concentration estimates. Specifically, satellite-derived estimates were found to be underestimated by a factor of more than 25 in the region of an intense phytoplankton bloom in the northwestern part of the Weddell Sea near the Antarctic Peninsula in January 2022. This study aims to identify the reasons for the significant underestimation by satellite and above-water remote sensing data and to examine the related regional bio-optical features, phytoplankton community characteristics, and challenges in atmospheric correction.</div><div>The in situ Chl-<em>a</em> concentration measured by standard extraction methods (with pheophytin-a correction) was 7.9 mg m⁻³, whereas standard satellite bio-optical algorithms produced values of around 0.25 mg m⁻³, and above-water remote sensing provided values of about 1.6–2.0 mg m⁻³. The underestimation was observed in both Level 2 and more rigorously filtered Level 3 satellite ocean color data, suggesting that similar biases might affect other studies relying on satellite-derived Chl-<em>a</em> maps.</div><div>The extreme underestimation (approximately 25–100-fold) of satellite-derived Chl-<em>a</em> was caused mainly by errors in atmospheric correction. The identified bio-optical reasons leading to the remote underestimation of Chl-<em>a</em> concentration by a factor of approximately 4 are attributed to relatively low specific light absorption by phytoplankton cells, non-phytoplankton particles, and colored dissolved organic matter compared to global ocean averages. As a result, the depth of the photic zone was approximately twice that expected for the given Chl-<em>a</em> concentration. Additionally, the study demonstrates that spectral shape and low values of the above-water remote-sensing reflectance are significantly influenced by reduced particulate backscattering fraction and near-zero exponent in the power-law fit to the particulate beam attenuation spectrum. All observed regional bio-optical features were significantly influenced by pigment packaging and the prevalence of nano- and micro- phytoplankton cells, which predominantly formed large colonies (tens to hundreds of microns) and aggregates exceeding 100 μm.</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"252 ","pages":"Article 104159"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145623988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spatial and temporal distribution of Sthenoteuthis oualaniensis in the Northwest Indian Ocean during different life stages of cyclonic eddies","authors":"Fu Yingyue ,&nbsp;Wu Xiaoci ,&nbsp;Jin Pengchao ,&nbsp;Zhang Zhong ,&nbsp;Xing Qinwang ,&nbsp;Yu Wei","doi":"10.1016/j.jmarsys.2025.104138","DOIUrl":"10.1016/j.jmarsys.2025.104138","url":null,"abstract":"<div><div>Mesoscale eddies, particularly cyclonic eddies (CEs), are known to influence the abundance and distribution of purpleback flying squid (<em>Sthenoteuthis oualaniensis</em>) resources in the northwest Indian Ocean. <em>Sthenoteuthis oualaniensis</em> is a short-lived species and is sensitive to environmental changes. The evolution of CEs is accompanied by structural and energetic transformations, exerting varying impacts on the local marine environment. However, the response of <em>S. oualaniensis</em> to these evolving CEs remains unclear. Therefore, this study analyzed the changes in basic eddy characteristics during CEs evolution and the environmental changes (sea surface temperature, chlorophyll-a concentration, and dissolved oxygen concentration at 150 m depth) driven by CEs. Combined with a habitat suitability index (HSI) model, the distribution of <em>S. oualaniensis</em> during the different life stages of CEs was analyzed. The results showed that the CEs experienced three stages: the early stage, the mature stage and the aged stage. At different stages, the parameters of CEs exhibited distinct distribution patterns. As the eddy evolved, the gravity center of <em>S. oualaniensis</em> abundance in latitude and longitude exhibited a movement trajectory similar to the eddy center. The environmental changes driven by this evolution process influenced the distribution of <em>S. oualaniensis</em>, and the maximum suitable habitat area was generated during the CEs mature stage. These results show that the evolution of CEs significantly affects the habitat distribution of <em>S. oualaniensis</em> in the northwest Indian Ocean.</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"252 ","pages":"Article 104138"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145118485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nutrient variability drivers in shallow coastal waters of the Eastern Arabian Sea during winter monsoon with implications for coastal productivity","authors":"Harikrishna Prasad Mamidala,&nbsp;D. Ganguly,&nbsp;R. Purvaja,&nbsp;R.S. Robin,&nbsp;G. Hariharan,&nbsp;Subbareddy Bonthu,&nbsp;R. Ramesh","doi":"10.1016/j.jmarsys.2025.104124","DOIUrl":"10.1016/j.jmarsys.2025.104124","url":null,"abstract":"<div><div>The Eastern Arabian Sea (EAS) exhibits complex nutrient variability driven by seasonal monsoon dynamics and hydrographic processes. This study investigates the spatial distribution of dissolved inorganic nutrients (DIN, DIP, and DSi), hydrographic conditions, and primary productivity in shallow coastal waters of this region during the winter monsoon of 2019. Our findings reveal regional contrasts, with the North-Eastern Arabian Sea (NEAS) experiencing cooler, nutrient-enriched waters due to convective mixing, supporting higher chlorophyll biomass, whereas the South-Eastern Arabian Sea (SEAS) remains warmer with limited nutrient flux. The coexistence of nutrient maxima and temperature minima in the surface coastal waters of north-eastern region further supports the efficient transport of cooler, nutrient-rich waters to the surface. Nutrient stoichiometry indicates nitrogen limitation in the SEAS and silicate-fuelled productivity in the NEAS. Chlorophyll-a (Chl-<em>a</em>) concentrations were significantly higher in the north-eastern region, reflecting enhanced surface productivity. Dissolved inorganic carbon (DIC) and partial pressure of CO₂ (pCO₂) analyses highlight the supersaturated state of CO₂ in this region, likely driven by convective overturning. Principal component analysis underscores the critical role of temperature, salinity, and mixing in shaping nutrient dynamics and carbon flux. These findings emphasize the need for sustained observation to predict the ecosystem's response to climatic variability and anthropogenic influences, making this study a valuable reference for understanding coastal productivity in monsoon-driven systems.</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"252 ","pages":"Article 104124"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144926790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Size-niche specific processes between mero- and holoplankton stabilize the continuum in size spectra of tropical estuarine and marine ecosystems","authors":"Denise Fabiana de Moraes Costa Schwamborn ,&nbsp;Catarina da Rocha Marcolin ,&nbsp;Nathália Lins-Silva ,&nbsp;Morgana Brito-Lolaia ,&nbsp;Alexandre Oliveira Almeida ,&nbsp;Ralf Schwamborn","doi":"10.1016/j.jmarsys.2025.104152","DOIUrl":"10.1016/j.jmarsys.2025.104152","url":null,"abstract":"<div><div>Size spectra contain key information on the functioning of ecosystems. Yet, the dynamic processes that shape a zooplankton size spectrum composed of numerous species and larval stages are still poorly documented. Normalized biomass size spectra (NBSS) were constructed to describe the total zooplankton, decapod larvae, and other mero- and ichthyoplankton in three areas of Tamandaré, Brazil. Bimonthly samples were obtained with a 300 μm mesh net, from 2013 to 2015, and analyzed with a ZooScan device. NBSS slopes were steeper than expected (Estuary: slope = −2.45 + − 0.16, Bay: slope = −1.81 + − 0.10, Shelf: slope = −1.80 + − 0.09), which was clearly due to the extremely high abundance of calanoid copepods (mostly <em>Acartia</em> spp.), especially in the Estuary. Removal of non-holoplanktonic organisms did not affect the NBSS slope, confirming the paradigm that the NBSS slope is a conservative property of ecosystems. We used permutation tests to compare the numbers of gaps in the size spectrum (i.e., empty bins). This emptiness test detected highly significant effects of non-holoplanktonic organisms on discrete holoplankton size fractions, in all study areas. Copepods were generally dominating in the size range &lt; 3 mm Feret length. In the Estuary, brachyuran crab larvae, fish eggs, and caridean shrimp zoeae were most important, as meroplanktonic contributors to discrete niches in the size spectrum. In Shelf and Bay areas, penaeid postlarvae and fish larvae were the most relevant large-sized taxa, in units of biovolume. Density-dependent negative interactions (top-down regulation and functional replacement) occurred between same-sized brachyuran zoeae and copepods. The processes that shape taxon-specific size spectra into a “gap-free” spectrum are discussed under an evolutionary size-niche perspective. Our results show that continuous power law size spectra are likely shaped by size-structured interactions, taxon-specific size niche strategies (e.g., competitive exclusion), and top-down density-dependent food web regulation processes.</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"252 ","pages":"Article 104152"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145473689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation and projection of Arctic sea ice transport through Fram Strait with emphasis on atmospheric multimodal responses","authors":"Zhou Ye ,&nbsp;Yu Zhang ,&nbsp;Wenyun Guo ,&nbsp;Changsheng Chen ,&nbsp;Hailong Guo ,&nbsp;Weizeng Shao ,&nbsp;Deshuai Wang ,&nbsp;Danya Xu ,&nbsp;Yi Zhou","doi":"10.1016/j.jmarsys.2025.104139","DOIUrl":"10.1016/j.jmarsys.2025.104139","url":null,"abstract":"<div><div>This study evaluates the historical (1988–2014) sea ice drift (SID), sea ice concentration (SIC), sea ice thickness (SIT), and associated sea ice volume transport (SIVT) from 12 CMIP6 models in Fram Strait based on multi-source reference datasets. In addition, a global ice-ocean coupled model based on the Finite Volume Community Ocean Model (Global-FVCOM), is included as a comparison. Both the simulated and reference SIVT show significant interannual variability, but inter-model spread exists. Compared to reference data, the CMIP6 models exhibit greater discrepancies than Global-FVCOM. The comprehensive assessment reveals notable performance differences among the models in simulating varying sea ice variables. Ensemble experiments, incorporating models with varying performance in simulating SIVT, demonstrate a decreasing trend in SIVT across all schemes under the SSP2–4.5 and SSP5–8.5 scenarios, with a more pronounced decline in the latter. Compared to the traditional multi-model mean scheme using all models, the scheme selecting six better-performing models through evaluation results of SIVT exhibits lower SIVT values and a slower decline. There are significant differences among the CMIP6 models regarding the dominant factors contributing to future SIVT variations. The largest number of models demonstrates a strong relationship between the dipole anomaly (DA) and sea ice transport, followed by those associated with the Arctic Oscillation (AO), while the fewest models show a significant connection to the Beaufort-Barents Oscillation (BBO). The choice of time period, whether by year or month, considerably influences the identification of dominant modes for sea ice transport.</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"252 ","pages":"Article 104139"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145267062","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Grain-size and geochemical evidence for sediment transport mechanisms in the northeastern part of the East Siberian Sea and on the adjacent continental slope","authors":"Ekaterina Ovsepyan ,&nbsp;Evgeniia Dorokhova ,&nbsp;Yaroslav Ovsepyan ,&nbsp;Ramiz Aliev ,&nbsp;Young Keun Jin","doi":"10.1016/j.jmarsys.2025.104140","DOIUrl":"10.1016/j.jmarsys.2025.104140","url":null,"abstract":"<div><div>Grain-size analyses, end-member modeling, X-ray fluorescence, and radionuclide activity measurements were conducted on sediment minicores collected from the middle-outer shelf of the East Siberian Sea (ESS) and the upper part of the adjacent continental slope to elucidate the sedimentation mechanisms in this poorly studied region. The grain-size data demonstrate that clayey silt and silt strongly dominate on the ESS shelf and the continental slope. In contrast, sandy silt has a patchy distribution. End-member modeling, applied here for the first time, indicates that sea ice (frazil and anchor ice) rafting, and nepheloid transport are the primary processes responsible for distributing sedimentary material across the ESS. The XRF data confirm the results of previous studies, reporting a predominantly lithogenic origin for ESS deposits. Combined grain size and geochemical records suggests that the shelf break area serves as a depocenter for fine silt particles, likely supplied by nepheloid flow, and represents the most productive area in the northeastern ESS. High sea surface productivity likely results from influence of nutrient-rich Pacific-derived waters, the upwelling of transformed Atlantic-derived waters, or a combination of both. The accumulation of the high amount of fine silt near the shelf break is suggested to be related to relatively calm bottom-water conditions, resulting from the potential interaction of the northward-flowing cross-shelf currents and episodic southward-moving compensatory flows. Wind direction is considered a key factor controlling the intensity of fine-grained material distribution by nepheloid flows and anchor ice across the ESS shelf. Sedimentation rates derived from the radionuclide activity measurements vary from 1.3 mm yr⁻¹ on the outer shelf to 1.0 mm yr⁻¹ on the upper continental slope.</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"252 ","pages":"Article 104140"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145227507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Citizen science study on maritime traffic and plastic debris in Asturias estuaries","authors":"Lucía Rivas-Iglesias ,&nbsp;Álvaro Gutiérrez-Rodríguez ,&nbsp;Sara Fernández ,&nbsp;Eleanor Casement ,&nbsp;Deva Menéndez-Teleña ,&nbsp;Iris Carrera-Rodríguez ,&nbsp;Eduardo Dopico ,&nbsp;Verónica Soto-López ,&nbsp;Eva Garcia-Vazquez","doi":"10.1016/j.jmarsys.2025.104153","DOIUrl":"10.1016/j.jmarsys.2025.104153","url":null,"abstract":"<div><div>Worldwide shipping currently moves some 11 billion tons per year and is expected to grow by at least 240 % by 2050. However, the increase in maritime traffic can also create challenges in terms of pollution, safety, and conservation of the marine environment. Maritime traffic on the Asturian Coast is an important part of the region's economic activity, with the estuary of Avilés being a key point for the entry and departure of merchant traffic as well as fishing and recreational traffic. There are also smaller fishing ports and marinas such as San Juan de la Arena (Nalón River estuary) or Ribadesella (Sella River estuary) with a long tradition of both fishing and recreational boating. In this citizen science study, maritime traffic was analyzed in the three estuaries. Water samples were taken from these ports to determine the concentration and types of microplastics through filtration and examination under the stereomicroscope. Marine litter was surveyed from adjacent beaches, also with the help of citizen volunteers. The results obtained from the analysis showed highly significant differences between ports for both the type of plastic litter and microplastics pollution, according to the type of maritime traffic and the port size. The microplastics were directly associated with the number of vessels in each estuary and did not differ in the types of polymers, suggesting a common marine origin. This research shows the importance of implementing sustainable management measures to ensure that maritime traffic on the Asturian Coast develops in an environmentally friendly way.</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"252 ","pages":"Article 104153"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145473734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Shoreline displacement assessment on the Pacific Coast of Colombia using numerical simulations, remote sensing and machine learning in a data-limited environment","authors":"Andrés M. Enríquez-Hidalgo ,&nbsp;Andrés Vargas-Luna ,&nbsp;Marc Mestres ,&nbsp;Jorge Escobar-Vargas ,&nbsp;Manuel Espino Infantes ,&nbsp;Andrés Torres","doi":"10.1016/j.jmarsys.2025.104146","DOIUrl":"10.1016/j.jmarsys.2025.104146","url":null,"abstract":"<div><div>Understanding Shoreline Displacement (SLD) in data- limited coastal regions, is critical for risk-informed management. We evaluate an integrated workflow that couples wave-hydrodynamic modeling, tide-corrected CoastSat satellite shorelines, and machine learning (ML) to characterize SLD drivers in Tumaco Bay on Colombia's southern pacific coast. Using data from 2017 to 2018, various structured meshes and advection schemes are tested. A 100 m mesh with a cyclic advection scheme best reproduced mesotidal dynamics when forced with TPXO8 tidal model for boundary conditions and wind data provided by a meteorological station. Model performance evaluated against Waverys reanalysis and available observations showed good skill, supporting application where in situ data are sparse. Multidecadal (1993–2024) CoastSat shoreline positions for El Morro and El Bajito beaches indicate an overall accretional tendency but found erosion hotspots affecting densely settled and touristic sectors. Regional wave conditions feature significant wave height (H_s) of 0.3–1.1 m, peak wave period (T_p) of 4–18 s, and predominantly westward wave approach, Random Forest (RF) results identify sea level (SL) and mean wave propagation direction (Θm) as the leading contributors to observed SLD variability, whereas H_s and T_p are secondary under the area's moderate wave energy. The study demonstrates the need to monitor localized erosion despite net accretion and demonstrate that combining physics-based modeling, open satellite archives, and data-driven methods can yield policy-relevant coastal insights in data-scarce tropical estuarine environments.</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"252 ","pages":"Article 104146"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145473736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}