Frontiers in Marine Science最新文献

{"title":"Macroalgae host pathogenic Vibrio spp. in a temperate estuary","authors":"Alexandra H. Geisser, Abigail K. Scro, Roxanna Smolowitz, Robinson W. Fulweiler","doi":"10.3389/fmars.2025.1549732","DOIUrl":"https://doi.org/10.3389/fmars.2025.1549732","url":null,"abstract":"Anthropogenic climate change is altering coastal systems globally, affecting macroalgae abundance and composition. These macroalgae host diverse microbiomes, including pathogenic bacteria. Of particular concern are <jats:italic>Vibrio</jats:italic> species, such as <jats:italic>Vibrio parahaemolyticus</jats:italic> and <jats:italic>Vibrio vulnificus</jats:italic>, which are linked to human disease and impact public health, the economy, and recreation in coastal areas. This study examined the presence and abundance of pathogenic <jats:italic>Vibrio</jats:italic> spp. across seven genera of macroalgae in a temperate estuary (Narragansett Bay, RI, USA). Using colony-forming unit (CFU) counts and multiplex qPCR, we quantified <jats:italic>V. parahaemolyticus</jats:italic> and <jats:italic>V. vulnificus</jats:italic> abundance to assess if pathogenic <jats:italic>Vibrio</jats:italic> abundance varied by macroalgae genus and morphology. We also examined potential environmental factors influencing pathogenic <jats:italic>Vibrio</jats:italic> prevalence. We demonstrate that both <jats:italic>V. vulnificus</jats:italic> and <jats:italic>V. parahaemolyticus</jats:italic> were present on all macroalgae genera, with <jats:italic>V. vulnificus</jats:italic> showing higher average abundance. Environmental factors like temperature, salinity, and nutrient concentrations did not strongly correlate with <jats:italic>V. vulnificus</jats:italic> or <jats:italic>V. parahaemolyticus</jats:italic> abundance, suggesting that macroalgae might offer a protective microhabitat for these pathogens. Macroalgae with opportunistic life strategies had the highest abundance of <jats:italic>V. vulnificus</jats:italic> and <jats:italic>V. parahaemolyticus</jats:italic>, highlighting their potential role as reservoirs for pathogenic <jats:italic>Vibrio</jats:italic> spp. Future research should explore broader environmental contexts and macroalgae–<jats:italic>Vibrio</jats:italic> spp. interactions to better understand and forecast pathogen dynamics.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"183 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143757759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The carbon reduction effect of ESG performance: empirical evidence from Chinese shipping enterprises","authors":"Jinpei Li, Jiaxin Suo, Yixuan Huang, Xiangdong Sun","doi":"10.3389/fmars.2025.1575398","DOIUrl":"https://doi.org/10.3389/fmars.2025.1575398","url":null,"abstract":"Environmental, social and governance (ESG) practices have become a crucial pathway for the sustainable development of enterprises, and so have shipping enterprises. Based on the unbalanced panel data of China’s A-share listed shipping enterprises from 2009 to 2022, this study uses a multiple regression model to empirically test the impact of ESG performance on carbon emission reduction and its regional heterogeneity. The findings indicate that ESG performance significantly reduces the carbon emission intensity of shipping enterprises, a conclusion that remains robust across various robustness tests and endogenetic analyses. Further heterogeneity analysis reveals that the carbon emission reduction effect of ESG performance is more pronounced in the southern region. These results underscore the importance of strengthening ESG capabilities as a key strategy for promoting the low-carbon transition of shipping enterprises and achieving sustainable development.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"103 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143745090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Slow growth and high longevity characterize the common, large Arctic brittle star, Ophiopleura borealis","authors":"Hanna Dinevik, Andreas Altenburger, Bodil A. Bluhm","doi":"10.3389/fmars.2025.1555911","DOIUrl":"https://doi.org/10.3389/fmars.2025.1555911","url":null,"abstract":"The longevity (lifespan) and growth rates of a given species provide the basis for estimating its contributions to secondary production and energy flow in an ecosystem, for guiding management decisions, and determining recovery times after disturbances. For brittle stars, a class of echinoderms that dominate the megabenthos in various marine systems due to their often large populations, including those on Arctic soft bottom shelves, growth and longevity information can be estimated through growth bands in their ossicles (arm bones). Here, we estimated the maximum life span, age distribution, and growth rate of the common, large Arctic endemic brittle star, <jats:italic>Ophiopleura borealis</jats:italic>, from the northern Barents Sea. We counted growth bands in trawl-caught specimens using scanning electron microscope images of the innermost arm ossicles of 80 specimens spanning the known size range. These counts were corrected for overgrowth of the earliest growth bands, and growth parameters were estimated using common growth models. The age bands appeared as alternating layers of dense and less dense lines in the stereom of the ossicle fossae. The maximum corrected age band count was 39, which we infer as reflecting the age in years. This estimate is higher than for most other studied brittle stars, including polar species. Most individuals in the sampled population spanned estimated ages from 25-32 years. The growth constant <jats:italic>k</jats:italic> estimates of 0.09 from the Single logistic growth model and 0.01 from the specialized van Bertalanffy model indicate slow growth. The combined slow growth rate and long lifespan in Arctic brittle stars suggest that the large stocks found in Arctic regions may take a substantial time period to establish and recover from potential disturbances.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"38 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143757768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Age and growth of Todaropsis eblanae (Ommastrephidae) through comparison of statoliths, beaks and eye lenses","authors":"Blondine Agus, Pietro Battaglia, Andrea Bellodi, Rita Cannas, Elisabetta Coluccia, Danila Cuccu","doi":"10.3389/fmars.2025.1567441","DOIUrl":"https://doi.org/10.3389/fmars.2025.1567441","url":null,"abstract":"The age composition of <jats:italic>Todaropsis eblanae</jats:italic> from the Sardinian waters (western Mediterranean Sea) was studied for the first time through the analysis of growth increments and the comparison of three structures: statoliths, beaks and eye lenses. The analysis was performed on 270 wild specimens of both sexes at different sizes (45-200 mm of mantle length; 6.98-443 g of total weight) and maturity stages (immature, maturing and mature) caught from July to September by trawl net. Significant differences in growth and length-weight relationship were observed between sexes, due to females reach a larger size than males. All the three structures had dimensions positively correlated with the size of the animals and showed clearly readable growth increments. Low values of IAPE, CV and PA confirmed the accuracy and good reproducibility of age readings. Eye lenses showed a very high number of growth increments (106-640), and a daily deposition was excluded. In contrast, beaks and statoliths showed NI values (70-316 and 73-310, respectively) always consistent with the size and maturity of the specimens, then a daily deposition has been suggested and their value compared. Moreover, the Mann-Whitney W-test confirmed a highly significant relationship between the number of growth increments in beaks and statoliths, suggesting that the beak can be considered a valid alternative to statoliths for age estimation in <jats:italic>T. eblanae</jats:italic>. The absolute growth rates confirm that females grow faster than males. Both sexes showed a higher initial growth rate, which gradually decreases, with the highest values at the age of 101-151 days, before reaching sexual maturity. According to a semelparous cycle, the estimated ages for the largest mature female (310-316 days) and male (288-292 days) suggest a lifespan of less than one year. Overall, the age and growth results reported, although referred to a specific area and a short sampling, could represent useful knowledge for a correct evaluation and management of this important commercial species in the future.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"16 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143745089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Seasonal spatial distribution patterns of AmphiOctopus ovulum in the East China Sea: current status future projections under various climate change scenarios","authors":"Linlin Yang, Min Xu, Yan Cui, Shuhao Liu","doi":"10.3389/fmars.2025.1573253","DOIUrl":"https://doi.org/10.3389/fmars.2025.1573253","url":null,"abstract":"Currently, there is also little up to date information on the the current population status and life history traits of <jats:italic>AmphiOctopus ovulum</jats:italic>, a very often seen cephalopod species in the East China Sea. It is therefore important to figure out the seasonal spatial distribution of this species, both in terms of number and biomass, and the environmental variables which determine them. Additionally, climate change plays an important role in determining the characteristics of individual species and thus on the ecosystems they inhabit. We set out to understand the responses of <jats:italic>A. ovulum</jats:italic> to habitat variables and to make projections based on the climate change scenarios described in the IPCC’s SSP1-2.6 and SSP5-8.5 criteria. We carried out seasonal bottom trawling surveys in the East China Sea region during 2018 and 2019 to fill this knowledge gap. Our results showed that the average individual size values ranged from 17.80−43.00 g·ind<jats:sup>-1</jats:sup> in spring and 23.49−33.00 g·ind<jats:sup>-1</jats:sup> in summer; the measured sea bottom temperature, sea bottom salinity, and depth value ranges were 10.81−27.06°C, 31.73–35.25‰, and 91–103 m independently in spring to winter. Our study showed that <jats:italic>A. ovulum</jats:italic> was distributed in the area between 27°–29°N, 122.5°–125°E during spring to autumn, and expanded into the area between 26.5°–32.5°N, 121°–124.5°E in winter. The core habitat of <jats:italic>A. ovulum</jats:italic> was centered on the area between 27.5°–28°N, 122.5°–123.5°E, and can be expected to expand to the northeast and southwest independently under the most likely global warming scenarios. Our results will benefit the development of suitable conservation measures for cephalopod habitats, and incorporate the impacts of climate change into fisheries management programs.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"75 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143745028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Elemental analysis in the scales of commercially important coastal fishes and their connections with fish feeding habits and habitats","authors":"Md. Sohel Parvez, Md. Imdadul Hoque, Md. Nurul Momen Siddique, Mohammad Mizanur Rahman, Edina Baranyai, Zsófi Sajtos, Boglárka Döncző, Haithem Aib, Md. Abdul Kader, Edina Simon, Herta Czédli","doi":"10.3389/fmars.2025.1546313","DOIUrl":"https://doi.org/10.3389/fmars.2025.1546313","url":null,"abstract":"Fish scales absorb different elements into the calcified matrix from surrounding waters as well as from the foods consumed. Scales microchemistry is drawing rising attention for its applicability in a wide range of fields, including environmental and ecological studies. The article represents an elemental analysis of the scales of five commercially important coastal fishes: <jats:italic>Tenualosa ilisha, Sillaginopsis panijus, Lates calcarifer, Otolithoides pama, and Rhinomugil corsula</jats:italic>. The concentrations of different essential and trace elements were measured using inductively coupled plasma optical emission spectrometry (ICP-OES), and their distribution on scales was mapped using micro-X-ray fluorescence (μ-XRF). The detected elements were categorized into five groups based on their overall mean concentrations: the most, considerable, moderate, low, and least available. The concentration (mg kg<jats:sup>−1</jats:sup>) of Ca was the highest (107472.32-181002.76) followed by P (41572.43-79042.02) among the elements in the studied fish scales, independent of species. The hierarchy of the overall mean concentration of elements was Ca&amp;gt;P&amp;gt;S&amp;gt;Mg&amp;gt;Na&amp;gt;K&amp;gt;Sr&amp;gt;Zn&amp;gt;Fe&amp;gt;Al&amp;gt;Ba&amp;gt;Mn&amp;gt;Cu&amp;gt;Cr. Element concentrations varied across fish feeding habits and habitats. Carnivore fish were found to have higher concentrations of K, Sr, and lower Fe than that in planktivore fish. The concentrations of Cr, Fe, S, Sr, and Zn were higher in demersal fish’s scales, whereas pelagic fish were found to have higher levels of Al, Ba, Ca, Cu, K, Mg, Mn, Na, and P. Element: Ca ratios, especially Sr: Ca, Mn: Ca, and Ba: Ca ratios, have potential implications as habitat signatures. Typically, fish otoliths are used for environmental and ecological purposes that involve cutting and sacrificing the sample. Employing scales instead could be a non-lethal alternative, crucial for sustainable fisheries management, especially for rare, vulnerable, or migratory fish.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"23 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143745088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of upwelling and submarine groundwater discharges on phytoplankton communities off the north coast of the Yucatan peninsula","authors":"Román Becerra-Reynoso, Ismael Mariño-Tapia, Jorge Herrera-Silveira, Cecilia Enriquez","doi":"10.3389/fmars.2025.1516784","DOIUrl":"https://doi.org/10.3389/fmars.2025.1516784","url":null,"abstract":"IntroductionCoastal regions around the world are influenced by numerous dynamical processes that supply nutrients for primary producers and trigger the food web. Rivers, submarine groundwater discharges (SGD), sediment suspension events, and upwelling, are amongst the more important. However, it is not just the concentration, but also the composition of nutrient supply that determines the type of phytoplankton community that develops, subsequently influencing the entire food web. It is therefore necessary to better understand the link between physical processes, nutrient composition and phytoplankton response in coastal oceans. This study investigates the effects of upwelling and submarine groundwater discharges on the phytoplankton community of a wide and shallow continental shelf.MethodsResults are achieved by using numerical modeling of dispersion events, as well as field data obtained from three oceanographic cruises, each representing a different hydrographic scenario (“No upwelling”, “Minor upwelling and SGD” and “Major upwelling and minor SGD”).ResultsThe upwelled water mass (SUW – Subtropical Underwater) was primarily found at the eastern end of the shelf (Cabo Catoche), where it rises and is transported westward by advection. The oceanographic stations influenced by the upwelled water showed an increase in diatom species population, known to thrive in environments with abundant inorganic nutrients. In contrast, submarine groundwater discharges were recorded nearshore on the western half of the shelf, mainly related to karst features of hydrogeological importance (a sinkhole ring associated with the Chicxulub crater). The stations with SGD influence had higher presence of nutrients such as NH4, suggesting recycling processes. This can modify either the phytoplankton community advected from Cabo Catoche, or promote local growth, leading to a dominance of dinoflagellates and unknown flagellates.DiscussionThis result implies a food web, similar to that of the mixoplankton-dominated microbial loop, which would be fed by organic matter of continental origin.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"90 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143757763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Underwater instance segmentation: a method based on channel spatial cross-cooperative attention mechanism and feature prior fusion","authors":"Zhiqian He, Lijie Cao, Xiaoqing Xu, Jianhao Xu","doi":"10.3389/fmars.2025.1557965","DOIUrl":"https://doi.org/10.3389/fmars.2025.1557965","url":null,"abstract":"In aquaculture, underwater instance segmentation methods offer precise individual identification and counting capabilities. However, due to the inherent unique optical characteristics and high noise in underwater imagery, existing underwater instance segmentation models struggle to accurately capture the global and local feature information of objects, leading to generally lower detection accuracy in underwater instance segmentation models. To address this issue, this study proposes a novel Channel Space Coordinates Attention (CSCA) attention module and a Channel A Prior Attention Fusion (CAPAF) feature fusion module, aiming to improve the accuracy of underwater instance segmentation. The CSCA module effectively captures local and global information by combining channel and spatial attention weight, while the CAPAF module optimizes feature fusion by removing redundant information through learnable parameters. Experimental results demonstrate significant improvements when these two modules are applied to the YOLOv8 model, with the mAP@0.5 metric increasing by 3.2% and 2% on the UIIS underwater instance segmentation dataset. Furthermore, the instance segmentation accuracy is significantly improved on the UIIS and USIS10K datasets after these two modules are applied to other networks.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"103 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143757760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rapid sample purification approach for 3H determination in seawater using ion exchange resin","authors":"Hong Ren, Xiaoxiang Ma, Peng Wang, Shunfei Yu, Hua Zou, Yiyao Cao","doi":"10.3389/fmars.2025.1518506","DOIUrl":"https://doi.org/10.3389/fmars.2025.1518506","url":null,"abstract":"IntroductionTritium exists in the environment primarily in the form of tritiated water (HTO). There is a significant correlation between the radioactive levels of tritium in seawater and the safety of seafood. By accurately and rapidly detecting the tritium activity concentration in seawater, it is possible to effectively assess its potential impact on the seafood supply chain. At present, the detection of tritium in environmental water samples is often by liquid scintillation counting (LSC). To enable the measure of tritium by LSC, sample purification is necessary, which is commonly performed by distillation. The sample purification by distillation method is somewhat time consuming, especially when processing many samples or large volumes.MethodsTo improve the analytical efficiency in tritium determination, a method for the purification of tritium in seawater using ion exchange resin was developed in this work, which is highly suitable for large-scale environmental monitoring in emergency situations as it significantly shortens the sample processing time (A sample can be purified in 10 min, and multiple samples can be processed simultaneously, which is at least 50 min shorter than the distillation method). The influence of the <jats:sup>90</jats:sup>Sr-<jats:sup>90</jats:sup>Y on the detection of tritium in seawater treated with ion-exchange resin was also discussed. The removal of metal ions from the seawater was achieved using magnetic agitation and filtration by mixing the sample with ion exchange resins.ResultsThe results show that the ion exchange resin can effectively remove metal ions from seawater, and reduce the conductivity of seawater to&amp;lt; 1 μS/cm, and effectively reduce the influence of the <jats:sup>90</jats:sup>Sr-<jats:sup>90</jats:sup>Y on tritium detection. The method was validated using spiked samples and compared with other methods.DiscussionThe recovery of tritium for standard solutions treated by ion exchange method ranged from 85.1% to 98.45%, indicating satisfactory efficiency in sample purification for tritium determination in seawater. 10 seawater samples were collected and used to verify the applicability of the method.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"183 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143757791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Morphology and evolution of submarine sand ridges and sand waves off the southwestern coast of Hainan Island, China","authors":"Yonghang Li, Huiqiang Yao, Zongheng Chen, Weidong Luo, Shi Zhang","doi":"10.3389/fmars.2025.1561392","DOIUrl":"https://doi.org/10.3389/fmars.2025.1561392","url":null,"abstract":"A substantial quantity of sedimentary sand bodies, including sand ridges, sand waves, and sand ripples, have been developed off the southwest coast of Hainan Island, China, with submarine sand ridges exhibiting the most considerable development scale. Determining the distribution, morphology, and evolutionary characteristics of the submarine sand ridges is crucial for exploiting marine sand resources and investigating engineering geological hazards. A comprehensive assessment of the study area was conducted utilizing marine survey techniques, including single-beam echo sounding, multi-beam echo sounding, side-scan sonar, single-channel seismic, and sediment sampling. The findings indicate the presence of eight substantial submarine sand ridges in the study area, delineated by tidal scour gullies and predominantly oriented in a NW-SE direction, with an average length of 21.3 km, an average width of 2.9 km, and an average height of 13.3 m. The sand ridges have a high-angle oblique bedding configuration. The grain size distribution of sediments in the study area is generally characterized by coarser near the shore and relatively finer away from the shore. The sediment type of the sand ridges is mainly sand-grade sediments (i.e., mean grain size Mz &amp;lt; 4Φ). A significant quantity of linear and barchan sand waves has developed within the sand ridge field, exhibiting variations in morphology, distribution, and scale. The coexistence and transformation of micro-geomorphic units, including sand waves, sand patches, and sand sheets, alongside sand ridges, reflect the complexity of the bedform-sediment-hydrodynamic system in the study area. The formation of the sand ridges may result from the late alteration of the ancient nearshore residual sand body. The study area revealed the presence of erosion-dominated, erosional-depositional, and deposition-dominated sand ridges, leading to the proposal of a development and evolution model for these sand ridges.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"60 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143745087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}