Frontiers in Marine Science最新文献

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Assessment on drag force distribution of a semi-submersible truss fish cage in currents
IF 3.7 2区 生物学
Frontiers in Marine Science Pub Date : 2025-03-07 DOI: 10.3389/fmars.2025.1557985
Hang-Fei Liu, Xiaohua Huang, Guoliang Pang, Gen Li, Taiping Yuan, Yu Hu, Qiyou Tao
{"title":"Assessment on drag force distribution of a semi-submersible truss fish cage in currents","authors":"Hang-Fei Liu, Xiaohua Huang, Guoliang Pang, Gen Li, Taiping Yuan, Yu Hu, Qiyou Tao","doi":"10.3389/fmars.2025.1557985","DOIUrl":"https://doi.org/10.3389/fmars.2025.1557985","url":null,"abstract":"Assessing the current forces exerted on a semi-submersible truss fish cage is crucial for understanding drag force distribution and ensuring the structural safety. The present study employs computational fluid dynamics (CFD) methods and porous media theory to predict the drag forces on a semi-submersible truss fish cage, providing a detailed description of the magnitude and distribution patterns of drag forces on the plane nets, pontoons, columns, and braces. Results indicate that the side plane nets bear the highest forces, contributing 24.3% of the total force. The pontoons and thick columns are the next most affected, contributing 18.7% and 13.8% of the total force, respectively, while the middle cross braces bear the least force at 3.7%. A decrease in current speed leads to reduced drag forces on the downstream side plane nets, columns, pontoons, and braces. However, the projected area of each component in the current direction is a critical factor influencing changes in drag forces. Additionally, the torque generated by the drag forces on the semi-submersible truss fish cage is examined. Center position of the torque can alter the torque direction exerted on the truss net cage, and the transition occurs between 18 cm and 19 cm. The present investigation provides a comprehensive evaluation of the drag force distribution on the semi-submersible truss fish cage, which is significant practical engineering implications.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"18 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143575165","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}
引用次数: 0
Biological invasions via ballast water: evaluating the distribution and gaps in research effort by geography, taxonomic group, and habitat type
IF 3.7 2区 生物学
Frontiers in Marine Science Pub Date : 2025-03-07 DOI: 10.3389/fmars.2025.1389559
Flávia M. P. Costa-Areglado, Gregory M. Ruiz, Frederico P. Brandini
{"title":"Biological invasions via ballast water: evaluating the distribution and gaps in research effort by geography, taxonomic group, and habitat type","authors":"Flávia M. P. Costa-Areglado, Gregory M. Ruiz, Frederico P. Brandini","doi":"10.3389/fmars.2025.1389559","DOIUrl":"https://doi.org/10.3389/fmars.2025.1389559","url":null,"abstract":"While crucial for maneuverability and safety of commercial ships, ballast water (BW) has long served as a major vector for the distribution of non-native species in coastal ecosystems. Species transfers via shipping can alter community composition, ecosystem function, economies, and human health. In recent decades, a significant body of research has focused on BW, including many <jats:italic>in-situ</jats:italic> studies, but this is unevenly distributed across global regions. Here, we conducted a literature review to evaluate the distribution of published BW studies across geographic regions, taxonomic groups, and habitats, highlighting some current knowledge gaps. Of 2,088 publications on BW in our review, 270 (13%) reported on <jats:italic>in-situ</jats:italic> sampling from ballast tanks across 194 unique geographic locations. For both number of publications and sampling effort, approximately 85% were from the northern hemisphere. Considering planktonic organisms sampled in BW, only 12% of publications were from the southern hemisphere, and no study reported analyses of benthic communities in ballast tanks outside of North America and Europe. While we recognize that our review does not capture all existing data, such as technical reports and regional journals, it provides a relative measure of research effort to date, highlighting the disparity among regions in taxonomic and habitat analyses of ballast communities. In particular, the low frequency of <jats:italic>in-situ</jats:italic> measures for many regions (especially the southern hemisphere) limits current understanding of BW species transfers, including changes over time in response to evolving management and policy across the globe.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"34 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143575340","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}
引用次数: 0
Response of carbonate factories to late Paleozoic climate change: a case study from the Yanduhe section, Hubei Province, South China
IF 3.7 2区 生物学
Frontiers in Marine Science Pub Date : 2025-03-07 DOI: 10.3389/fmars.2025.1513219
Zihang Huang, Xuefei Yi, Yunfei Huang, Li Tian, Kui Wu, Mengfan Li
{"title":"Response of carbonate factories to late Paleozoic climate change: a case study from the Yanduhe section, Hubei Province, South China","authors":"Zihang Huang, Xuefei Yi, Yunfei Huang, Li Tian, Kui Wu, Mengfan Li","doi":"10.3389/fmars.2025.1513219","DOIUrl":"https://doi.org/10.3389/fmars.2025.1513219","url":null,"abstract":"The carbonate factory concept was proposed to understand the spatial dynamics and processes involved in carbonate production, which was heavily influenced by climate change. The Permian period witnessed several significant climate change events that had a considerable impact on the carbonate factory. However, research on how the carbonate factory responded to these climate change events during the Permian is still limited. In this study, a detailed analysis of carbonate microfacies was conducted in the Yanduhe section, western Hubei Province, South China, to investigate the relationship between the carbonate factory and climate change. Ten sedimentary microfacies were detected, and classified into three microfacies associations, which correspond to different environments of inner ramp, middle ramp, and outer ramp. Meanwhile, eight transgression-regression sequences were identified, revealing a sea-level change trend consistent with observations from other regions in South China. Furthermore, six types of carbonate factories were recognized and five changes in carbonate factories were observed. Among those five changes, two occurred during the Late Kungurian and Late Wuchiapingian respectively, and may be attributed to climate changes, while one at the end-Guadalupian likely resulted from both the end-Guadalupian mass extinction and climate change. The other two changes in carbonate factories were caused by sea-level fluctuations. In addition, climate change affects sea surface temperature and sea levels, thereby regulating the biological communities involved in carbonate production and driving a shift in the types of carbonate factories.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"22 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143575163","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}
引用次数: 0
3D ecological niche models outperform 2D in predicting coelacanth (Latimeria spp.) habitat
IF 3.7 2区 生物学
Frontiers in Marine Science Pub Date : 2025-03-06 DOI: 10.3389/fmars.2025.1521474
Emmaline Sheahan, Hannah Owens, Robert Guralnick, Gavin Naylor
{"title":"3D ecological niche models outperform 2D in predicting coelacanth (Latimeria spp.) habitat","authors":"Emmaline Sheahan, Hannah Owens, Robert Guralnick, Gavin Naylor","doi":"10.3389/fmars.2025.1521474","DOIUrl":"https://doi.org/10.3389/fmars.2025.1521474","url":null,"abstract":"IntroductionDiscoveries of coelacanth populations off the East African coast and in the Indo-Pacific warrant an analysis of their potential distributions, but the necessary tools to model and project their distributions in 3 dimensions are lacking.MethodsUsing occurrence records for the West Indian ocean coelacanth, <jats:italic>Latimeria chalumnae</jats:italic>, we produced 3D and 2D maximum entropy ecological niche models and projected them into the habitat of the Indonesian coelacanth, <jats:italic>Latimeria menadoensis</jats:italic>. We gauged each model’s success by how well it could predict <jats:italic>L. menadoensis</jats:italic> presences recorded from submersible observations.ResultsWhile the 2D model omitted 33% of occurrences at the most forgiving threshold, the 3D model successfully predicted all occurrences, regardless of threshold level.DiscussionIncorporating depth results in improved model accuracy when predicting coelacanth habitat, and projecting into 3 dimensions can give us insights as to where to target future sampling. This 3D modelling framework can help us better understand how marine species are distributed by depth and allow for more targeted conservation management.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"30 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143560655","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}
引用次数: 0
Hooking efficiencies of SMART drumlines and their possible deployment rates vs gillnets for bather protection
IF 3.7 2区 生物学
Frontiers in Marine Science Pub Date : 2025-03-06 DOI: 10.3389/fmars.2024.1513232
Paul A. Butcher, Matt K. Broadhurst, Victor M. Peddemors, Aidan J. McGarty, Brian R. Cullis
{"title":"Hooking efficiencies of SMART drumlines and their possible deployment rates vs gillnets for bather protection","authors":"Paul A. Butcher, Matt K. Broadhurst, Victor M. Peddemors, Aidan J. McGarty, Brian R. Cullis","doi":"10.3389/fmars.2024.1513232","DOIUrl":"https://doi.org/10.3389/fmars.2024.1513232","url":null,"abstract":"IntroductionFor 87 years, gillnets have been deployed off up to 51 beaches in New South Wales, Australia, to reduce bites on humans by white (<jats:italic>Carcharodon carcharias</jats:italic>), bull (<jats:italic>Carcharhinus leucas</jats:italic>), and tiger (<jats:italic>Galeocerdo cuvier</jats:italic>) sharks. Recently, to minimise unwanted fishing mortalities, baited drumlines with electronic catch sensors, called ‘shark management alert in real time’ (SMART) have been trialled. The SMART drumlines are more selective than gillnets and because catches are quickly removed (with target sharks spatially displaced), nearly all survive. Nevertheless, important questions remain unanswered, including (1) the required number of SMART drumlines at a beach and (2) their risk of not being deployed due to adverse weather—which doesn’t affect gillnets.MethodsTo answer the first question, we analysed 22,025 diurnal SMART drumline deployments across 1637 days for the frequency of proximal captures (i.e. ≥two target sharks caught in similar space and time) and dependence on the number of SMART drumlines. The second question was investigated by collating weather conditions during 31 years of target-shark catches (290 white sharks and 93 tiger sharks) in gillnets and correlating these to the known operational limitations of SMART drumlines.ResultsAmong 494 hooked sharks, 71% were targets (298 whites, 43 tigers, and 9 bulls). No multiple daily catches were recorded for bull or tiger sharks, but there were 46 instances where up to five white sharks were caught off the same beach on the same day, with twenty occurrences within five km and 60 min of initial capture. Proximal captures remained independent of the number of deployed SMART drumlines or the region. The historical gillnet data revealed adverse weather would have restricted deploying SMART drumlines to 67–83% of the period gillnets were deployed, and up to ~75% of those occasions when white and tiger sharks were gillnetted.ConclusionWhile we acknowledge there would be fewer water users during adverse sea conditions, if SMART drumlines replace gillnets, their greater catching efficiency, selectivity, and survival of released animals need to be rationalised against fewer temporally comparable deployments. If the latter is acceptable, we recommend at least two or three SMART drumlines per beach to ensure a baited hook remains in the water while others are checked.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"18 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143570382","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}
引用次数: 0
Spatiotemporal evolution of scouring and silting in Made Island port channel (2015–2023)
IF 3.7 2区 生物学
Frontiers in Marine Science Pub Date : 2025-03-06 DOI: 10.3389/fmars.2025.1557950
Qing Wang, Guanghui Wang, Hongwei Jiang, Hailong Song, Dianguang Ma, Yu Duan
{"title":"Spatiotemporal evolution of scouring and silting in Made Island port channel (2015–2023)","authors":"Qing Wang, Guanghui Wang, Hongwei Jiang, Hailong Song, Dianguang Ma, Yu Duan","doi":"10.3389/fmars.2025.1557950","DOIUrl":"https://doi.org/10.3389/fmars.2025.1557950","url":null,"abstract":"This paper, based on channel topographic survey data from 2015 to 2023, analyzes the scouring and silting evolution characteristics of the Made Island port channel, port basin, outer anchorage, and empty ship anchorage. By conducting a quantitative analysis of water depth variations and scouring and silting phenomena across different years, this paper investigates the effects of water flow, topographic changes, and human dredging activities on the topographic evolution of the port area. The study utilizes bathymetric survey data collected at two-year intervals using the MV SEA PRINCESS survey vessel, equipped with a Positioning, Motion and Heading Unit, Bathymetric Equipment for Sounding, Sound Velocity Profiler, Single Beam Echosounder, and Transducers. The monitoring methodology involved interpolating and subtracting multi-year bathymetric data to assess sediment transport dynamics. The results indicate that the Made Island port channel exhibits a dynamic alternation of scouring and silting, with significant sediment accumulation in shallow areas, especially after dredging operations. Notably, the outer anchorage experiences the highest silting rates in years with increased sediment supply, whereas the port basin generally maintains deeper water levels, ensuring its functionality despite localized siltation. The empty ship anchorage shows strong correlations between water flow speed variations and sediment deposition, leading to navigational constraints in certain conditions. The findings indicate that the scouring and silting phenomena in the port area are the result of multiple interacting factors. The paper recommends regular topographic monitoring and the implementation of necessary dredging and maintenance measures to ensure the efficient operation and navigational safety of the port.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"2 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143560745","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}
引用次数: 0
Emerging evidence for apical dominance in colonial branching Acropora corals
IF 3.7 2区 生物学
Frontiers in Marine Science Pub Date : 2025-03-05 DOI: 10.3389/fmars.2025.1531462
Eleonora Re, Carlos M. Duarte
{"title":"Emerging evidence for apical dominance in colonial branching Acropora corals","authors":"Eleonora Re, Carlos M. Duarte","doi":"10.3389/fmars.2025.1531462","DOIUrl":"https://doi.org/10.3389/fmars.2025.1531462","url":null,"abstract":"Coloniality and clonality in marine sessile organisms offer several advantages, such as better space occupation and directional growth. In coral colonies, species-specific functional connections are maintained among polyps, allowing for resource translocation and colony architecture coordination. A potential whole-colony integration mechanism is apical dominance, a phenomenon controlling branching patterns through hormonal signaling in plants and seagrass, yet unconfirmed in scleractinian corals. This study aims at investigating the occurrence of apical dominance in corals, hypothesizing that highly integrated species exhibit this mechanism. We experimentally tested this hypothesis <jats:italic>in situ</jats:italic> by removing the apical tip in three different species (<jats:italic>Stylophora</jats:italic> sp., <jats:italic>Acropora hemprichii, A. pharaonis</jats:italic>), presenting two contrasting levels of integration and monitoring their branching morphogenesis over time. After 74 days, the null hypothesis that apical dominance does not occur could not be rejected for <jats:italic>A. hemprichii</jats:italic> and <jats:italic>Stylophora</jats:italic> sp., likely due to experimental limitations. However, <jats:italic>A. pharaonis</jats:italic> exhibited accelerated apical regrowth and increased lateral branching after tip removal, suggesting that apical dominance-like mechanisms may operate in this species. These findings highlight the importance of addressing potential Type 1 and Type 2 errors in experimental design to improve reliability while addressing the emergence of apical dominance in highly integrated coral colonies. Further long-term experiments are needed to capture morphometric changes in slow-growing species, such as <jats:italic>A. hemprichii</jats:italic>. These findings suggest novel endogenous mechanisms coordinating complex three-dimensional morphogenesis in clonal organisms and offer valuable application in the growing field of coral farming and restoration.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"44 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143560672","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}
引用次数: 0
Decomposition of a minke whale carcass in a temperate dune ecosystem
IF 3.7 2区 生物学
Frontiers in Marine Science Pub Date : 2025-03-05 DOI: 10.3389/fmars.2025.1474460
Martin J. Baptist, Mardik F. Leopold, Marinka E. B. van Puijenbroek, Hans Verdaat, Nicole Janinhoff-Verdaat, Dennis R. Lammertsma, Wim J. Dimmers, Paul F. A. M. Römkens, Jan Burgers
{"title":"Decomposition of a minke whale carcass in a temperate dune ecosystem","authors":"Martin J. Baptist, Mardik F. Leopold, Marinka E. B. van Puijenbroek, Hans Verdaat, Nicole Janinhoff-Verdaat, Dennis R. Lammertsma, Wim J. Dimmers, Paul F. A. M. Römkens, Jan Burgers","doi":"10.3389/fmars.2025.1474460","DOIUrl":"https://doi.org/10.3389/fmars.2025.1474460","url":null,"abstract":"Due to the benefits to the ecosystem there is a growing incentive to limit management interventions of stranded whales. This study was conducted to test the impact of a stranded whale carcass decomposing in a natural dune ecosystem and to gain experience in managing a beached whale carcass. A 4.70 m male juvenile minke whale <jats:italic>Balaenoptera acutorostrata</jats:italic> carcass washed up on the western side of the uninhabited island Rottumerplaat, the Netherlands. The carcass was moved the same night into the dunes to prevent it from washing back into the sea. Regular field visits were undertaken and wildlife trail cameras were placed to document the decomposition stages and the attraction of avifauna. Pitfall traps were placed to monitor insect fauna next to the carcass. Vegetation plots were surveyed to document changes to the dune vegetation and soil cores were taken to determine the increase in metal, carbon and nutrient contents. Decomposition of the carcass until the bare skeleton within the temperate dune ecosystem took about two years. The carcass was highly beneficial for beetle biodiversity, attracting different beetle species at various stages of decomposition. In total, 129 species of beetles were found near the carcass, of which eight species are specific for carcasses. For scavenging birds such as gulls, magpies and carrion crows the skin of the minke whale was too tough to break open. While the initial nutrient leakage from the carcass was toxic to dune plants immediately around the carcass, it eventually promoted lush vegetation growth due to increased fertility. The bioavailable metal contents in the soil for potassium (K) and nickel (Ni) showed a significant increase due to the presence of the whale carcass up to six months. Significantly increased levels of arsenic (As), cobalt (Co) and vanadium (V) were found up to one and a half years later and sodium (Na) and manganese (Mn) persisted in elevated levels up to two years later. Recommendations were given on management interventions when leaving a whale carcass on site.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"2 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143560675","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}
引用次数: 0
Extraction of typical oyster pile columns in the Maowei Sea, Beibu Gulf, based on unmanned aerial vehicle laser point cloud orthophotos
IF 3.7 2区 生物学
Frontiers in Marine Science Pub Date : 2025-03-05 DOI: 10.3389/fmars.2025.1502123
Jinze Du, Meiqin Huang, Zhenjun Kang, Yichao Tian, Jin Tao, Qiang Zhang, Yutong Xie, Jinying Mo, LiYan Huang, Yusheng Feng
{"title":"Extraction of typical oyster pile columns in the Maowei Sea, Beibu Gulf, based on unmanned aerial vehicle laser point cloud orthophotos","authors":"Jinze Du, Meiqin Huang, Zhenjun Kang, Yichao Tian, Jin Tao, Qiang Zhang, Yutong Xie, Jinying Mo, LiYan Huang, Yusheng Feng","doi":"10.3389/fmars.2025.1502123","DOIUrl":"https://doi.org/10.3389/fmars.2025.1502123","url":null,"abstract":"Pile culture is a breeding method commonly used for oyster seedlings in the intertidal zone of southern China. Artificial visual interpretation serves as the primary monitoring approach for oyster seedling cultivation in marine areas. Manual visual interpretation is often time-consuming, inefficient, and does not provide spatially continuous information about the structure. Consequently, obtaining data on oyster pile columns and oyster seedling culture areas presents certain limitations. This study focuses on Shajing Town, Qinzhou City, Guangxi Zhuang Autonomous Region, China, as its research area. It utilizes multi-spectral image data from unmanned aerial vehicles (UAVs), light detection and ranging (LiDAR) point cloud technology, and deep learning algorithms to extract representative oyster pile columns in Maowei Sea within Beibu Gulf. By employing band features and texture indices extracted from UAV’s multi-spectral images as data sources and combining them with a classification and prediction model based on deep learning convolutional neural networks (CNN), we successfully extract the desired oyster pile columns. The results demonstrate that: 1) By comparing three machine learning models and integrating the LiDAR point cloud oyster pile column height model (OPCHM) into the S3 scenario, the convolutional neural network (CNN) attains an impressive overall classification accuracy (OA) of 96.54% and a Kappa coefficient of 0.9593, significantly enhancing and optimizing the CNN’s predictive accuracy for classification tasks; 2) In comparison with conventional machine learning algorithms, deep learning exhibits remarkable feature extraction capability.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"44 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143560706","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}
引用次数: 0
Identifying Saharan dust driven export of biogenic material in the ultraoligotrophic eastern Mediterranean Sea
IF 3.7 2区 生物学
Frontiers in Marine Science Pub Date : 2025-03-05 DOI: 10.3389/fmars.2025.1537028
Anouk P. E. van Boxtel, Jan-Berend W. Stuut, Francien Peterse
{"title":"Identifying Saharan dust driven export of biogenic material in the ultraoligotrophic eastern Mediterranean Sea","authors":"Anouk P. E. van Boxtel, Jan-Berend W. Stuut, Francien Peterse","doi":"10.3389/fmars.2025.1537028","DOIUrl":"https://doi.org/10.3389/fmars.2025.1537028","url":null,"abstract":"To assess the effects of dust deposition on the strength of the biological pump in the Mediterranean Sea by acting as fertilizer and/or ballasting agent, we analyzed fluxes of mineral dust, particulate organic carbon (POC) and inorganic carbon (PIC), and source-specific lipid biomarkers (i.e., higher plant-derived long-chain fatty acids and phytoplankton-derived alkenones, C<jats:sub>30</jats:sub> 1,15 diols, and sterols) in sinking particles. Sinking particles were collected at ten-day intervals by a sediment-trap mooring deployed in the Ionian Basin from April 2017 to May 2018 at 2340 m water depth. High POC fluxes occur during summer, when surface ocean primary production is lowest due to thermal stratification. Notably, these high POC fluxes coincide with pulses of substantial dust deposition, suggesting that POC export is primarily driven by dust deposition and subsequent ballasting. However, the lipid composition, and thereby that of the phytoplankton community, differs between dust events. (Seasonal) variations in the properties of the deposited dust, presumably associated with its provenance, likely control the effect of dust deposition on phytoplankton response and export in the Ionian Basin. Although POC export is associated with dust deposition, the net effect of dust deposition on the biological pump is more ambiguous as not all dust events are associated with an increase in POC export, and most dust events are also associated with PIC export that has a counteracting effect on the biological pump. Multi-year time series of dust deposition and biogenic export are required to validate the seasonal variations in dust-driven export of biogenic material observed here, and to account for effects of interannual variations in dust fluxes and phytoplankton production on the strength of the biological pump.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"24 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143560670","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}
引用次数: 0
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