Regional Studies in Marine Science最新文献

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Meta-analysis of the spatial distribution and composition of plastic macro-debris in Indonesia 印度尼西亚塑料宏观碎片空间分布和组成的荟萃分析
IF 2.4 4区 环境科学与生态学
Regional Studies in Marine Science Pub Date : 2025-08-29 DOI: 10.1016/j.rsma.2025.104460
Max R. Kelly , Muhammad Reza Cordova , Susan Jobling , Richard C. Thompson
{"title":"Meta-analysis of the spatial distribution and composition of plastic macro-debris in Indonesia","authors":"Max R. Kelly ,&nbsp;Muhammad Reza Cordova ,&nbsp;Susan Jobling ,&nbsp;Richard C. Thompson","doi":"10.1016/j.rsma.2025.104460","DOIUrl":"10.1016/j.rsma.2025.104460","url":null,"abstract":"<div><div>Plastic pollution is recognised as a global environmental problem with Indonesia identified as a major contributing source. However, a comprehensive understanding of pollution patterns remains hindered by fragmented data and methodological inconsistencies across studies. This study synthesises data from 44 peer-reviewed publications, spanning 68 field locations and 328 individual study sites across 19 provinces, to map the spatial distribution and composition of plastic macro-debris in Indonesia. We identified plastic bags, plastic food packaging, and plastic bottles as the three most prevalent item types, occurring as top three ranked items in 65 %, 63 %, and 40 % of field locations, respectively. Items were recorded across seven different environment types: beach (n = 43 field locations); river (n = 16); mangroves (n = 3); seabed (n = 2); coral reef (n = 2); sea surface (n = 1) and inland areas (n = 1), with research effort concentrated in Java, accounting for 40 % of all field locations. Despite Indonesia’s environmental and regional diversity, multivariate analysis revealed no significant differences in litter composition between environment types or provinces, indicating that common plastic items dominate pollution across Indonesia. These findings underscore the need for coordinated national action targeting high-prevalence items and highlight the value of widespread beach litter monitoring as a proxy for broader environmental pollution patterns.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"90 ","pages":"Article 104460"},"PeriodicalIF":2.4,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144996811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Exploring the distribution of per- and polyfluoroalkyl substances (PFAS) in surface water and wildlife from the Galápagos Islands 探索Galápagos群岛地表水和野生动物中全氟烷基和多氟烷基物质的分布
IF 2.4 4区 环境科学与生态学
Regional Studies in Marine Science Pub Date : 2025-08-28 DOI: 10.1016/j.rsma.2025.104438
Qaim Mehdi , Lauren E. Blackman , Gregory A. Lewbart , Juan Pablo Muñoz-Pérez , Daniela Alarcón-Ruales , Diego Páez-Rosas , Joe Aufmuth , John A. Bowden
{"title":"Exploring the distribution of per- and polyfluoroalkyl substances (PFAS) in surface water and wildlife from the Galápagos Islands","authors":"Qaim Mehdi ,&nbsp;Lauren E. Blackman ,&nbsp;Gregory A. Lewbart ,&nbsp;Juan Pablo Muñoz-Pérez ,&nbsp;Daniela Alarcón-Ruales ,&nbsp;Diego Páez-Rosas ,&nbsp;Joe Aufmuth ,&nbsp;John A. Bowden","doi":"10.1016/j.rsma.2025.104438","DOIUrl":"10.1016/j.rsma.2025.104438","url":null,"abstract":"<div><div>PFAS are ubiquitous in the environment and have been detected in remote areas due to their persistence and potential long-range transport capabilities. We conducted a survey to explore the distribution of PFAS in surface water and wildlife from the Galápagos archipelago. Overall, 8 out of 21 PFAS were detected in 24 surface water samples, with PFOA and PFNA having the highest detection rates (79 % of samples). Plasma samples were obtained from marine iguanas (n = 24), black-striped salemas (n = 6), and Galápagos sea lions (n = 14). Marine iguanas and black-striped salemas had only PFNA and PFTrDA quantified, respectively, whereas Galápagos sea lions exhibited a myriad of long-chain PFAS, with L-PFOS and PFCAs (C9 - C13) showing 100 % detection rates. Our results confirmed the presence of PFAS in the Galápagos archipelago, emphasizing that further research is needed to better understand the impact of these contaminants in suspected pristine and remote ecosystems.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"90 ","pages":"Article 104438"},"PeriodicalIF":2.4,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144922873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Fast estimation of the carbon footprint for shipbuilding based on compensated gross tonnage 基于补偿总吨位的船舶碳足迹快速估计
IF 2.4 4区 环境科学与生态学
Regional Studies in Marine Science Pub Date : 2025-08-28 DOI: 10.1016/j.rsma.2025.104455
Wen-Cai Tang , De-Ning Song , Jing-Hua Li , Yu-Guang Zhong
{"title":"Fast estimation of the carbon footprint for shipbuilding based on compensated gross tonnage","authors":"Wen-Cai Tang ,&nbsp;De-Ning Song ,&nbsp;Jing-Hua Li ,&nbsp;Yu-Guang Zhong","doi":"10.1016/j.rsma.2025.104455","DOIUrl":"10.1016/j.rsma.2025.104455","url":null,"abstract":"<div><div>This study introduces a methodology for the fast estimation of the carbon footprint associated with shipbuilding, utilizing compensated gross tonnage (CGT) as a key metric. Unlike conventional research approaches that depend on extensive datasets related to shipbuilding, this method facilitates swift evaluations during the preliminary design phases or in contexts where data is limited. The study establishes empirical correlations between CGT and various ship dimensions, while also calculating process-specific workloads to assess emissions through life cycle assessment (LCA). Based on this method, a user-friendly interface was developed to automate these calculations. Validation through a case study indicated that the maximum estimation errors for dimensions were below 6.25 %, and the maximum errors for emissions were under 22.6 %, with the latter primarily attributed to regional differences in energy sources. Although there are inherent limitations, this method offers a balance between accuracy and practicality, thereby enabling timely environmentally conscious decisions and reducing dependence on post-construction data. This approach responds to the maritime industry's demand for simplified carbon accounting tools, thereby contributing to sustainable shipbuilding practices and the achievement of zero-emission objectives.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"90 ","pages":"Article 104455"},"PeriodicalIF":2.4,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144925932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Distribution, extraction and isolation process, and biological activity of mycosporine-like amino acids of Phaeocystis globosa 球形Phaeocystis globbosa真菌孢素类氨基酸的分布、提取分离工艺及生物活性研究
IF 2.4 4区 环境科学与生态学
Regional Studies in Marine Science Pub Date : 2025-08-28 DOI: 10.1016/j.rsma.2025.104452
Kelong Xu , You Yu , Chenwei Mao , Xin Wei , Shiyan Zheng , Yingying Sun , Lei Guo
{"title":"Distribution, extraction and isolation process, and biological activity of mycosporine-like amino acids of Phaeocystis globosa","authors":"Kelong Xu ,&nbsp;You Yu ,&nbsp;Chenwei Mao ,&nbsp;Xin Wei ,&nbsp;Shiyan Zheng ,&nbsp;Yingying Sun ,&nbsp;Lei Guo","doi":"10.1016/j.rsma.2025.104452","DOIUrl":"10.1016/j.rsma.2025.104452","url":null,"abstract":"<div><div>Mycosporine-like amino acids (MAAs) are a class of multi-active compounds widely present in marine microalgae. <em>Phaeocystis globosa</em> is a global cause of red tides, and thus its resource utilization is a matter of research interest. To analyze whether <em>P. globosa</em> could be used as a new source of MAAs, the distribution, extraction, mineral content, and antioxidant and antibacterial activities in vitro were determined by absorptiometry using a series of single-factor and corresponding response surface experiments. MAAs were isolated and identified through cation-exchange resin chromatography and HPLC-MS. The content of MAAs in colonies (MAAs-CL) was much higher than that in culture media (MAAs-CM). The yield of MAAs-CL was 9.143 mg/g when the methanol concentration, extraction time, material-liquid ratio, and temperature were 20 %, 3 h, 2 mg/mL, and 45 °C, respectively. MAAs-CL were rich in beneficial minerals, exhibited better scavenging capacity against ·OH, and did not show antibacterial activity. However, the MAAs-CL affected the formation of colonies. MAAs-CL contained shinorine, palythine, and porphyra-334, while only shinorine was found in MAAs-CM. In summary, MAAs content in the colonies of <em>P. globosa</em> was significantly higher than that in most reported dinoflagellates, diatoms, and other microalgae species, with a yield advantage of 30 %–50 %. The identified MAAs components exhibited excellent antioxidant activity, which endowed them with unique application values in the development of natural sunscreens and biomedical raw materials. <em>P. globosa</em> has the biological characteristics of short growth cycle and easy enrichment of colonial morphology, which can achieve efficient harvesting through simple filtration processes, significantly reducing post-processing costs compared with traditional single-celled microalgae. With its remarkable yield advantage, strong antioxidant activity, and potential for low-cost large-scale cultivation, <em>P. globosa</em> has become a new biological source of MAAs with development value.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"90 ","pages":"Article 104452"},"PeriodicalIF":2.4,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144996781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An integrated approach to analyse pocket beach morphodynamics from geospatial techniques 从地理空间技术分析口袋海滩形态动力学的综合方法
IF 2.4 4区 环境科学与生态学
Regional Studies in Marine Science Pub Date : 2025-08-27 DOI: 10.1016/j.rsma.2025.104445
T.W.S. Warnasuriya, T.N. Munasinghe
{"title":"An integrated approach to analyse pocket beach morphodynamics from geospatial techniques","authors":"T.W.S. Warnasuriya,&nbsp;T.N. Munasinghe","doi":"10.1016/j.rsma.2025.104445","DOIUrl":"10.1016/j.rsma.2025.104445","url":null,"abstract":"<div><div>Beach, the interface between water and land is frequently subject to change due to natural and anthropogenic activities so that proper understanding of beach morphodynamics is important for implementing coastal zone management strategies effectively. However, due to a lack of current knowledge about pocket beach morphodynamics, comprehensive studies are needed using novel technologies and methodologies. Therefore, this study aimed to propose a multidimensional beach morphodynamic matrix as a new method for a comprehensive analysis under different shoreline indicators by focusing on transect-based, area-based and volume-based analyses under spatial and temporal scales in a pocket beach in Sri Lanka as an experimental site. The methodology of the study involved remote sensing, GIS and field surveys. Accuracy assessment was also implemented using field data and other derived data to ensure the reliability of the study. Results revealed that there were short-term changes in the beach daily, weekly, monthly, and seasonal basis leading to dynamic geomorphological settings. Furthermore, the matrix introduced from this study through an integrated approach is found to be an effective way of interpreting and monitoring beach morphodynamics in pocket beaches as a low-cost mechanism giving insights into using the broad spectrum of geospatial techniques.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"90 ","pages":"Article 104445"},"PeriodicalIF":2.4,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144925930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A decade after being listed as Endangered: Japanese eel stock inferred from fishery-dependent and independent monitoring records 在被列为濒危物种十年后:根据依赖渔业和独立监测记录推断的日本鳗鱼种群
IF 2.4 4区 环境科学与生态学
Regional Studies in Marine Science Pub Date : 2025-08-27 DOI: 10.1016/j.rsma.2025.104456
Kenzo Kaifu , Hikaru Itakura , Tomonari Kotani , Akira Shinoda , Yu-San Han , Tatsuki Yoshinaga , Ryoshiro Wakiya
{"title":"A decade after being listed as Endangered: Japanese eel stock inferred from fishery-dependent and independent monitoring records","authors":"Kenzo Kaifu ,&nbsp;Hikaru Itakura ,&nbsp;Tomonari Kotani ,&nbsp;Akira Shinoda ,&nbsp;Yu-San Han ,&nbsp;Tatsuki Yoshinaga ,&nbsp;Ryoshiro Wakiya","doi":"10.1016/j.rsma.2025.104456","DOIUrl":"10.1016/j.rsma.2025.104456","url":null,"abstract":"<div><div>This study assesses recent trends in the abundance of Japanese eels (<em>Anguilla japonica</em>), which have been listed as Endangered on the IUCN Red List of Threatened Species since 2014, by updating previously reported coastal fisheries datasets and incorporating new freshwater data and scientific monitoring records for glass eels in Japan and Taiwan. Catch-per-unit-effort (CPUE) data for yellow and silver eels revealed statistically significant declines in seven of eight datasets, with projected reductions over three generations (24 years) ranging from 79.2 % to 99.9 %. In contrast, no significant temporal trends were detected in the CPUE of glass eels, likely due to high interannual variability driven by oceanic conditions. The integration of freshwater and coastal data, along with fishery-independent monitoring, enhances the reliability of these indicators. The results provided in this study represent the best currently available indicators of Japanese eel population dynamics.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"90 ","pages":"Article 104456"},"PeriodicalIF":2.4,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144922869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Spatial distribution of extreme upwelling event in the Seas of Alor Kecil, Indonesia, revealed by UAV’s thermal infrared sensor 无人机热红外传感器揭示的印尼Alor Kecil海域极端上升流事件的空间分布
IF 2.4 4区 环境科学与生态学
Regional Studies in Marine Science Pub Date : 2025-08-27 DOI: 10.1016/j.rsma.2025.104451
Anindya Wirasatriya , Sigit Bayhu Iryanthony , R. Dwi Susanto , Teguh Agustiadi , Kunarso , Aris Ismanto , Muhammad Helmi , Muhammad Zainuri , Rikha Widiaratih , Gentio Harsono , Dwiyoga Nugroho , Adi Purwandana , Shoimatul Fitria , Jahved Ferianto Maro , Yupiter Nungnulang Sondy Kitarake , Efrin Antonia Dollu , Riandi Teguh Widiyandono , Chunhua Qiu , Anjar Dimara Sakti , Priyadi Dwi Santoso , Elifelet Kelendonu
{"title":"Spatial distribution of extreme upwelling event in the Seas of Alor Kecil, Indonesia, revealed by UAV’s thermal infrared sensor","authors":"Anindya Wirasatriya ,&nbsp;Sigit Bayhu Iryanthony ,&nbsp;R. Dwi Susanto ,&nbsp;Teguh Agustiadi ,&nbsp;Kunarso ,&nbsp;Aris Ismanto ,&nbsp;Muhammad Helmi ,&nbsp;Muhammad Zainuri ,&nbsp;Rikha Widiaratih ,&nbsp;Gentio Harsono ,&nbsp;Dwiyoga Nugroho ,&nbsp;Adi Purwandana ,&nbsp;Shoimatul Fitria ,&nbsp;Jahved Ferianto Maro ,&nbsp;Yupiter Nungnulang Sondy Kitarake ,&nbsp;Efrin Antonia Dollu ,&nbsp;Riandi Teguh Widiyandono ,&nbsp;Chunhua Qiu ,&nbsp;Anjar Dimara Sakti ,&nbsp;Priyadi Dwi Santoso ,&nbsp;Elifelet Kelendonu","doi":"10.1016/j.rsma.2025.104451","DOIUrl":"10.1016/j.rsma.2025.104451","url":null,"abstract":"<div><div>Dramatic and quick drop in sea surface temperature (SST) of more than 10°C is what distinguishes an extreme upwelling event (EUE) in the seas of Alor Kecil, Alor Island, Indonesia. The minimum SST due to extreme upwelling can reach 12°C, making this the sole phenomenon in the world because no tropical seas have such cold SST. EUE occurs solely along the Mulut Kumbang Strait, which is 300 m wide and 900 m long. This phenomenon only occurs at spring tides from August to November, lasting about one hour each time. We were able to expose detailed characteristics of SST distribution throughout the peak and fading stages of EUE from 1 to 4 September 2023 using thermal infrared sensors placed on the Unmanned Aerial Vehicle. During EUE, the SST distribution also reveals the complex current pattern distribution. The minimum SST during the peak of EUE is 12°C. Northward flood current brings cold water from the deeper layer in front of the strait mouth into the strait, where it meets the southward background current, which is probably related to Indonesian Throughflow (ITF), forming a strong SST front in the strait's northern portion. The SST differential between two water masses in the front area exceeds 5°C, making this one of the strongest SST fronts in the world. The flood current also transports warm surface water from the Pantar Strait, creating warm water plume among the relatively cold water masses within the strait. During EUE decay, combined ebb and background currents generate a strong, warmed southerly current that drives cold water back to the deep layer in front of the strait mouth. This study indicates the new insight of the interaction between the global scale circulation as represented by ITF and local scale tidal current that generate EUE in the seas of Alor Kecil.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"90 ","pages":"Article 104451"},"PeriodicalIF":2.4,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144913117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The seasonal and tidal effects on turbidity in Guanabara Bay, Rio de Janeiro - Brazil 巴西里约热内卢瓜纳巴拉湾季节和潮汐对浊度的影响
IF 2.4 4区 环境科学与生态学
Regional Studies in Marine Science Pub Date : 2025-08-27 DOI: 10.1016/j.rsma.2025.104449
L.F.M. Faria de Sousa , L.A. Sander de Carvalho , M. Cirano , F.D.T. Barberini , D.A. Maciel , P.K. Lange , F.S. Soares , A.M. Ciotti
{"title":"The seasonal and tidal effects on turbidity in Guanabara Bay, Rio de Janeiro - Brazil","authors":"L.F.M. Faria de Sousa ,&nbsp;L.A. Sander de Carvalho ,&nbsp;M. Cirano ,&nbsp;F.D.T. Barberini ,&nbsp;D.A. Maciel ,&nbsp;P.K. Lange ,&nbsp;F.S. Soares ,&nbsp;A.M. Ciotti","doi":"10.1016/j.rsma.2025.104449","DOIUrl":"10.1016/j.rsma.2025.104449","url":null,"abstract":"<div><div>The Guanabara Bay (GB) faces significant water quality degradation due to natural and human-induced pressures. The role of meteorological, oceanographic and hydrological variables and how they relate to water color still require further investigation in order to understand their environmental impact. This study investigates the spatio-temporal dynamics of turbidity in GB as an indicator of suspended material. Using a 20-year MODIS-Terra dataset, we applied a robust methodology for sunglint and skyglint correction to develop a turbidity estimation algorithm, alongside testing semi-analytical methods. We analyzed images based on their median and standard deviation across wet (November-March) and dry (April-October) periods, considering both flood and ebb tides during spring, transition, and neap tidal conditions. The second-order polynomial regression algorithm revealed to be not only effective but also the one with easier applicability for turbidity estimation using the red band (645<!--> <!-->nm) in Google Earth Engine platform. The spatial-temporal evaluation showed higher turbidity and variability in the northeast and northwest regions, associated with major river inputs, while the lowest turbidity occurred near the bay's entrance, linked to continuous water renewal from the Atlantic Ocean. Increased variability at the bay's entrance during the wet season might be related to upwelling waters that intensify during flood tide. Turbidity is typically higher during ebb tides when compared to flood tides, with spring tides showing higher values than neap tides. Nevertheless, more research is necessary to understand turbidity variations with tides and the role of residual currents and wind-driven sediment resuspension.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"90 ","pages":"Article 104449"},"PeriodicalIF":2.4,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144996814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effects of hyposalinity stress on the physiological state of the marine microalgae Coccomyxa parasitica 低盐度胁迫对海洋微藻寄生球藻生理状态的影响
IF 2.4 4区 环境科学与生态学
Regional Studies in Marine Science Pub Date : 2025-08-27 DOI: 10.1016/j.rsma.2025.104443
E.S. Kladchenko, D.S. Lavrichenko, E.A. Bogacheva, E.S. Chelebieva
{"title":"Effects of hyposalinity stress on the physiological state of the marine microalgae Coccomyxa parasitica","authors":"E.S. Kladchenko,&nbsp;D.S. Lavrichenko,&nbsp;E.A. Bogacheva,&nbsp;E.S. Chelebieva","doi":"10.1016/j.rsma.2025.104443","DOIUrl":"10.1016/j.rsma.2025.104443","url":null,"abstract":"<div><div>The parasitic green microalga <em>Coccomyxa parasitica</em> is an emerging pathogen of bivalves with potential implications for mariculture. As climate change drives alterations in coastal salinity regimes, understanding the physiological resilience of this microalga to hyposaline conditions is critical. In this study, we investigated the effects of hyposalinity (13, 18, 25, and 35 psu) on the physiological state of <em>C. parasitica</em> over a 7-day period. Cell abundance, morphology, chlorophyll a fluorescence, reactive oxygen species (ROS), and mitochondrial membrane potential were analyzed using flow cytometry, fluorescence staining, and optical microscopy. The alga demonstrated remarkable tolerance to low salinity, with the highest cell proliferation observed at 13 and 18 psu, indicating a stimulatory effect of hyposalinity on short-term population growth. A significant shift toward spherical cell morphology was observed at 13 psu, consistent with osmotic stress-induced cytoskeletal or turgor changes. Chlorophyll a levels remained low under severe hyposalinity (13 psu), suggesting suppressed photosynthetic activity, while higher salinities (18–35 psu) supported greater pigment retention and viability. ROS levels increased with decreasing salinity, reflecting oxidative stress, yet were partially mitigated over time, implying activation of antioxidant defenses. Notably, mitochondrial membrane potential was maintained or enhanced across all salinity treatments, with the highest values recorded at 18 psu by day 7, indicating robust mitochondrial function and energetic support for stress acclimation and cell division. These findings reveal that <em>C. parasitica</em> exhibits high physiological plasticity and can thrive under hyposaline conditions, potentially expanding its range into estuarine and low-salinity coastal zones. This adaptive capacity underscores its potential as an emerging threat to aquaculture in the context of climate-driven environmental change.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"90 ","pages":"Article 104443"},"PeriodicalIF":2.4,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144913184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Multiple paternity of loggerhead turtles on Dalyan Beach, Türkiye 台湾大雁海滩的红海龟多父性
IF 2.4 4区 环境科学与生态学
Regional Studies in Marine Science Pub Date : 2025-08-26 DOI: 10.1016/j.rsma.2025.104441
Arzu Kaska , Melissa Vezard , Yakup Kaska
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